529 lines
13 KiB
C
529 lines
13 KiB
C
/*
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Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include "iscsi.h"
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#include "iscsi-private.h"
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#include "scsi-lowlevel.h"
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struct iscsi_scsi_cbdata {
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struct iscsi_scsi_cbdata *prev, *next;
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iscsi_command_cb callback;
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void *private_data;
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struct scsi_task *task;
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};
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void
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iscsi_free_scsi_cbdata(struct iscsi_scsi_cbdata *scsi_cbdata)
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{
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if (scsi_cbdata == NULL) {
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return;
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}
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if (scsi_cbdata->task != NULL) {
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scsi_free_scsi_task(scsi_cbdata->task);
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scsi_cbdata->task = NULL;
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}
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free(scsi_cbdata);
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}
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void
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iscsi_cbdata_steal_scsi_task(struct scsi_task *task)
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{
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struct iscsi_scsi_cbdata *scsi_cbdata =
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scsi_get_task_private_ptr(task);
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if (scsi_cbdata != NULL) {
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scsi_cbdata->task = NULL;
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}
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}
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static void
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iscsi_scsi_response_cb(struct iscsi_context *iscsi, int status,
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void *command_data, void *private_data)
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{
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struct iscsi_scsi_cbdata *scsi_cbdata =
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(struct iscsi_scsi_cbdata *)private_data;
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struct scsi_task *task = command_data;
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switch (status) {
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case SCSI_STATUS_GOOD:
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scsi_cbdata->callback(iscsi, SCSI_STATUS_GOOD, task,
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scsi_cbdata->private_data);
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return;
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case SCSI_STATUS_CHECK_CONDITION:
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scsi_cbdata->callback(iscsi, SCSI_STATUS_CHECK_CONDITION, task,
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scsi_cbdata->private_data);
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return;
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default:
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iscsi_set_error(iscsi, "Cant handle scsi status %d yet.",
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status);
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scsi_cbdata->callback(iscsi, SCSI_STATUS_ERROR, task,
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scsi_cbdata->private_data);
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}
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}
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int
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iscsi_scsi_command_async(struct iscsi_context *iscsi, int lun,
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struct scsi_task *task, iscsi_command_cb cb,
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struct iscsi_data *data, void *private_data)
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{
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struct iscsi_pdu *pdu;
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struct iscsi_scsi_cbdata *scsi_cbdata;
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int flags;
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if (iscsi->session_type != ISCSI_SESSION_NORMAL) {
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iscsi_set_error(iscsi, "Trying to send command on "
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"discovery session.");
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scsi_free_scsi_task(task);
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return -1;
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}
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if (iscsi->is_loggedin == 0) {
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iscsi_set_error(iscsi, "Trying to send command while "
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"not logged in.");
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scsi_free_scsi_task(task);
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return -1;
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}
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scsi_cbdata = malloc(sizeof(struct iscsi_scsi_cbdata));
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if (scsi_cbdata == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: failed to allocate "
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"scsi cbdata.");
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scsi_free_scsi_task(task);
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return -1;
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}
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bzero(scsi_cbdata, sizeof(struct iscsi_scsi_cbdata));
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scsi_cbdata->task = task;
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scsi_cbdata->callback = cb;
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scsi_cbdata->private_data = private_data;
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scsi_set_task_private_ptr(task, scsi_cbdata);
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pdu = iscsi_allocate_pdu(iscsi, ISCSI_PDU_SCSI_REQUEST,
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ISCSI_PDU_SCSI_RESPONSE);
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if (pdu == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory, Failed to allocate "
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"scsi pdu.");
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iscsi_free_scsi_cbdata(scsi_cbdata);
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return -1;
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}
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pdu->scsi_cbdata = scsi_cbdata;
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/* flags */
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flags = ISCSI_PDU_SCSI_FINAL|ISCSI_PDU_SCSI_ATTR_SIMPLE;
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switch (task->xfer_dir) {
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case SCSI_XFER_NONE:
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break;
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case SCSI_XFER_READ:
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flags |= ISCSI_PDU_SCSI_READ;
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break;
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case SCSI_XFER_WRITE:
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flags |= ISCSI_PDU_SCSI_WRITE;
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if (data == NULL) {
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iscsi_set_error(iscsi, "DATA-OUT command but data "
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"== NULL.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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if (data->size != task->expxferlen) {
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iscsi_set_error(iscsi, "Data size:%d is not same as "
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"expected data transfer "
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"length:%d.", data->size,
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task->expxferlen);
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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if (iscsi_pdu_add_data(iscsi, pdu, data->data, data->size)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to "
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"add outdata to the pdu.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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break;
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}
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iscsi_pdu_set_pduflags(pdu, flags);
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/* lun */
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iscsi_pdu_set_lun(pdu, lun);
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/* expxferlen */
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iscsi_pdu_set_expxferlen(pdu, task->expxferlen);
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/* cmdsn */
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iscsi_pdu_set_cmdsn(pdu, iscsi->cmdsn);
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pdu->cmdsn = iscsi->cmdsn;
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iscsi->cmdsn++;
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/* exp statsn */
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iscsi_pdu_set_expstatsn(pdu, iscsi->statsn+1);
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/* cdb */
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iscsi_pdu_set_cdb(pdu, task);
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pdu->callback = iscsi_scsi_response_cb;
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pdu->private_data = scsi_cbdata;
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if (iscsi_queue_pdu(iscsi, pdu) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: failed to queue iscsi "
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"scsi pdu.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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return 0;
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}
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int
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iscsi_process_scsi_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
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const unsigned char *hdr, int size)
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{
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int statsn, flags, response, status;
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struct iscsi_scsi_cbdata *scsi_cbdata = pdu->scsi_cbdata;
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struct scsi_task *task = scsi_cbdata->task;
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statsn = ntohl(*(uint32_t *)&hdr[24]);
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if (statsn > (int)iscsi->statsn) {
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iscsi->statsn = statsn;
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}
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flags = hdr[1];
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if ((flags&ISCSI_PDU_DATA_FINAL) == 0) {
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iscsi_set_error(iscsi, "scsi response pdu but Final bit is "
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"not set: 0x%02x.", flags);
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pdu->callback(iscsi, SCSI_STATUS_ERROR, task,
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pdu->private_data);
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return -1;
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}
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if ((flags&ISCSI_PDU_DATA_ACK_REQUESTED) != 0) {
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iscsi_set_error(iscsi, "scsi response asked for ACK "
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"0x%02x.", flags);
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pdu->callback(iscsi, SCSI_STATUS_ERROR, task,
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pdu->private_data);
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return -1;
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}
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response = hdr[2];
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status = hdr[3];
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switch (status) {
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case SCSI_STATUS_GOOD:
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task->datain.data = pdu->indata.data;
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task->datain.size = pdu->indata.size;
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pdu->indata.data = NULL;
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pdu->indata.size = 0;
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pdu->callback(iscsi, SCSI_STATUS_GOOD, task,
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pdu->private_data);
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break;
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case SCSI_STATUS_CHECK_CONDITION:
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task->datain.size = size - ISCSI_HEADER_SIZE;
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task->datain.data = malloc(task->datain.size);
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if (task->datain.data == NULL) {
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iscsi_set_error(iscsi, "failed to allocate blob for "
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"sense data");
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}
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memcpy(task->datain.data, hdr + ISCSI_HEADER_SIZE,
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task->datain.size);
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task->sense.error_type = task->datain.data[2] & 0x7f;
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task->sense.key = task->datain.data[4] & 0x0f;
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task->sense.ascq = ntohs(*(uint16_t *)
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&(task->datain.data[14]));
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iscsi_set_error(iscsi, "SENSE KEY:%s(%d) ASCQ:%s(0x%04x)",
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scsi_sense_key_str(task->sense.key),
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task->sense.key,
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scsi_sense_ascq_str(task->sense.ascq),
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task->sense.ascq);
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pdu->callback(iscsi, SCSI_STATUS_CHECK_CONDITION, task,
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pdu->private_data);
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break;
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default:
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iscsi_set_error(iscsi, "Unknown SCSI status :%d.", status);
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pdu->callback(iscsi, SCSI_STATUS_ERROR, task,
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pdu->private_data);
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return -1;
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}
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return 0;
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}
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int
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iscsi_process_scsi_data_in(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
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const unsigned char *hdr, int size _U_, int *is_finished)
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{
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int statsn, flags, status;
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struct iscsi_scsi_cbdata *scsi_cbdata = pdu->scsi_cbdata;
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struct scsi_task *task = scsi_cbdata->task;
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int dsl;
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statsn = ntohl(*(uint32_t *)&hdr[24]);
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if (statsn > (int)iscsi->statsn) {
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iscsi->statsn = statsn;
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}
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flags = hdr[1];
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if ((flags&ISCSI_PDU_DATA_ACK_REQUESTED) != 0) {
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iscsi_set_error(iscsi, "scsi response asked for ACK "
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"0x%02x.", flags);
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pdu->callback(iscsi, SCSI_STATUS_ERROR, task,
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pdu->private_data);
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return -1;
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}
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dsl = ntohl(*(uint32_t *)&hdr[4])&0x00ffffff;
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if (iscsi_add_data(iscsi, &pdu->indata,
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discard_const(hdr + ISCSI_HEADER_SIZE), dsl, 0)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: failed to add data "
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"to pdu in buffer.");
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return -1;
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}
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if ((flags&ISCSI_PDU_DATA_FINAL) == 0) {
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*is_finished = 0;
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}
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if ((flags&ISCSI_PDU_DATA_CONTAINS_STATUS) == 0) {
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*is_finished = 0;
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}
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if (*is_finished == 0) {
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return 0;
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}
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/* this was the final data-in packet in the sequence and it has
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* the s-bit set, so invoke the callback.
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*/
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status = hdr[3];
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task->datain.data = pdu->indata.data;
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task->datain.size = pdu->indata.size;
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pdu->indata.data = NULL;
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pdu->indata.size = 0;
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pdu->callback(iscsi, status, task, pdu->private_data);
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return 0;
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}
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/*
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* SCSI commands
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*/
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int
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iscsi_testunitready_async(struct iscsi_context *iscsi, int lun,
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iscsi_command_cb cb, void *private_data)
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{
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struct scsi_task *task;
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int ret;
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task = scsi_cdb_testunitready();
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if (task == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
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"testunitready cdb.");
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return -1;
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}
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ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL,
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private_data);
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return ret;
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}
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int
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iscsi_reportluns_async(struct iscsi_context *iscsi, int report_type,
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int alloc_len, iscsi_command_cb cb, void *private_data)
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{
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struct scsi_task *task;
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int ret;
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if (alloc_len < 16) {
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iscsi_set_error(iscsi, "Minimum allowed alloc len for "
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"reportluns is 16. You specified %d.",
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alloc_len);
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return -1;
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}
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task = scsi_reportluns_cdb(report_type, alloc_len);
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if (task == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
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"reportluns cdb.");
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return -1;
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}
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/* report luns are always sent to lun 0 */
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ret = iscsi_scsi_command_async(iscsi, 0, task, cb, NULL,
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private_data);
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return ret;
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}
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int
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iscsi_inquiry_async(struct iscsi_context *iscsi, int lun, int evpd,
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int page_code, int maxsize,
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iscsi_command_cb cb, void *private_data)
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{
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struct scsi_task *task;
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int ret;
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task = scsi_cdb_inquiry(evpd, page_code, maxsize);
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if (task == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
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"inquiry cdb.");
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return -1;
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}
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ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL,
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private_data);
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return ret;
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}
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int
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iscsi_readcapacity10_async(struct iscsi_context *iscsi, int lun, int lba,
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int pmi, iscsi_command_cb cb, void *private_data)
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{
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struct scsi_task *task;
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int ret;
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task = scsi_cdb_readcapacity10(lba, pmi);
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if (task == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
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"readcapacity10 cdb.");
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return -1;
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}
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ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL,
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private_data);
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return ret;
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}
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int
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iscsi_read10_async(struct iscsi_context *iscsi, int lun, int lba,
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int datalen, int blocksize,
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iscsi_command_cb cb, void *private_data)
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{
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struct scsi_task *task;
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int ret;
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if (datalen % blocksize != 0) {
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iscsi_set_error(iscsi, "Datalen:%d is not a multiple of "
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"the blocksize:%d.", datalen, blocksize);
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return -1;
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}
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task = scsi_cdb_read10(lba, datalen, blocksize);
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if (task == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
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"read10 cdb.");
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return -1;
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}
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ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL,
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private_data);
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return ret;
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}
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int
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iscsi_write10_async(struct iscsi_context *iscsi, int lun, unsigned char *data,
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int datalen, int lba, int fua, int fuanv, int blocksize,
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iscsi_command_cb cb, void *private_data)
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{
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struct scsi_task *task;
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struct iscsi_data outdata;
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int ret;
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if (datalen % blocksize != 0) {
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iscsi_set_error(iscsi, "Datalen:%d is not a multiple of the "
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"blocksize:%d.", datalen, blocksize);
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return -1;
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}
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task = scsi_cdb_write10(lba, datalen, fua, fuanv, blocksize);
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if (task == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
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"read10 cdb.");
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return -1;
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}
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outdata.data = data;
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outdata.size = datalen;
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ret = iscsi_scsi_command_async(iscsi, lun, task, cb, &outdata,
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private_data);
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return ret;
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}
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int
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iscsi_modesense6_async(struct iscsi_context *iscsi, int lun, int dbd, int pc,
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int page_code, int sub_page_code,
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unsigned char alloc_len,
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iscsi_command_cb cb, void *private_data)
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{
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struct scsi_task *task;
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int ret;
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task = scsi_cdb_modesense6(dbd, pc, page_code, sub_page_code,
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alloc_len);
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if (task == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
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"modesense6 cdb.");
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return -1;
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}
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ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL,
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private_data);
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return ret;
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}
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int
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iscsi_synchronizecache10_async(struct iscsi_context *iscsi, int lun, int lba,
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int num_blocks, int syncnv, int immed,
|
|
iscsi_command_cb cb, void *private_data)
|
|
{
|
|
struct scsi_task *task;
|
|
int ret;
|
|
|
|
task = scsi_cdb_synchronizecache10(lba, num_blocks, syncnv,
|
|
immed);
|
|
if (task == NULL) {
|
|
iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
|
|
"synchronizecache10 cdb.");
|
|
return -1;
|
|
}
|
|
ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL,
|
|
private_data);
|
|
|
|
return ret;
|
|
}
|
|
|