--- /dev/null
+/*
+ Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
+
+ 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 3 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.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include "iscsi.h"
+#include "iscsi-private.h"
+#include "scsi-lowlevel.h"
+#include "dlinklist.h"
+
+struct iscsi_scsi_cbdata {
+ struct iscsi_scsi_cbdata *prev, *next;
+ iscsi_command_cb callback;
+ void *private_data;
+ struct scsi_task *task;
+};
+
+void iscsi_free_scsi_cbdata(struct iscsi_scsi_cbdata *scsi_cbdata)
+{
+ if (scsi_cbdata == NULL) {
+ return;
+ }
+ if (scsi_cbdata->task == NULL) {
+ scsi_free_scsi_task(scsi_cbdata->task);
+ scsi_cbdata->task = NULL;
+ }
+ free(scsi_cbdata);
+}
+
+static void iscsi_scsi_response_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
+{
+ struct iscsi_scsi_cbdata *scsi_cbdata = (struct iscsi_scsi_cbdata *)private_data;
+ struct scsi_task *task = command_data;
+
+ switch (status) {
+ case ISCSI_STATUS_CHECK_CONDITION:
+ scsi_cbdata->callback(iscsi, ISCSI_STATUS_CHECK_CONDITION, task, scsi_cbdata->private_data);
+ return;
+
+
+ case ISCSI_STATUS_GOOD:
+ scsi_cbdata->callback(iscsi, ISCSI_STATUS_GOOD, task, scsi_cbdata->private_data);
+ return;
+ default:
+ printf("Cant handle scsi status %d yet\n", status);
+ scsi_cbdata->callback(iscsi, ISCSI_STATUS_ERROR, task, scsi_cbdata->private_data);
+ }
+}
+
+
+static int iscsi_scsi_command_async(struct iscsi_context *iscsi, int lun, struct scsi_task *task, iscsi_command_cb cb, struct iscsi_data *data, void *private_data)
+{
+ struct iscsi_pdu *pdu;
+ struct iscsi_scsi_cbdata *scsi_cbdata;
+ int flags;
+
+ if (iscsi == NULL) {
+ printf("trying to send command on NULL context\n");
+ scsi_free_scsi_task(task);
+ return -1;
+ }
+
+ if (iscsi->session_type != ISCSI_SESSION_NORMAL) {
+ printf("Trying to send command on discovery session\n");
+ scsi_free_scsi_task(task);
+ return -2;
+ }
+
+ if (iscsi->is_loggedin == 0) {
+ printf("Trying to send command while not logged in\n");
+ scsi_free_scsi_task(task);
+ return -3;
+ }
+
+ scsi_cbdata = malloc(sizeof(struct iscsi_scsi_cbdata));
+ if (scsi_cbdata == NULL) {
+ printf("failed to allocate scsi cbdata\n");
+ scsi_free_scsi_task(task);
+ return -4;
+ }
+ bzero(scsi_cbdata, sizeof(struct iscsi_scsi_cbdata));
+ scsi_cbdata->task = task;
+ scsi_cbdata->callback = cb;
+ scsi_cbdata->private_data = private_data;
+
+ pdu = iscsi_allocate_pdu(iscsi, ISCSI_PDU_SCSI_REQUEST, ISCSI_PDU_SCSI_RESPONSE);
+ if (pdu == NULL) {
+ printf("Failed to allocate text pdu\n");
+ iscsi_free_scsi_cbdata(scsi_cbdata);
+ return -5;
+ }
+ pdu->scsi_cbdata = scsi_cbdata;
+
+ /* flags */
+ flags = ISCSI_PDU_SCSI_FINAL|ISCSI_PDU_SCSI_ATTR_SIMPLE;
+ switch (task->xfer_dir) {
+ case SCSI_XFER_NONE:
+ break;
+ case SCSI_XFER_READ:
+ flags |= ISCSI_PDU_SCSI_READ;
+ break;
+ case SCSI_XFER_WRITE:
+ flags |= ISCSI_PDU_SCSI_WRITE;
+ if (data == NULL) {
+ printf("DATA-OUT command but data == NULL\n");
+ iscsi_free_pdu(iscsi, pdu);
+ return -5;
+ }
+ if (data->size != task->expxferlen) {
+ printf("data size:%d is not same as expected data transfer length:%d\n", data->size, task->expxferlen);
+ iscsi_free_pdu(iscsi, pdu);
+ return -7;
+ }
+ if (iscsi_pdu_add_data(iscsi, pdu, data->data, data->size) != 0) {
+ printf("Failed to add outdata to the pdu\n");
+ iscsi_free_pdu(iscsi, pdu);
+ return -6;
+ }
+
+ break;
+ }
+ iscsi_pdu_set_pduflags(pdu, flags);
+
+ /* lun */
+ iscsi_pdu_set_lun(pdu, lun);
+
+ /* expxferlen */
+ iscsi_pdu_set_expxferlen(pdu, task->expxferlen);
+
+ /* cmdsn */
+ iscsi_pdu_set_cmdsn(pdu, iscsi->cmdsn);
+ pdu->cmdsn = iscsi->cmdsn;
+ iscsi->cmdsn++;
+
+ /* exp statsn */
+ iscsi_pdu_set_expstatsn(pdu, iscsi->statsn+1);
+
+ /* cdb */
+ iscsi_pdu_set_cdb(pdu, task);
+
+ pdu->callback = iscsi_scsi_response_cb;
+ pdu->private_data = scsi_cbdata;
+
+ if (iscsi_queue_pdu(iscsi, pdu) != 0) {
+ printf("failed to queue iscsi scsi pdu\n");
+ iscsi_free_pdu(iscsi, pdu);
+ return -6;
+ }
+
+ return 0;
+}
+
+
+int iscsi_process_scsi_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu, const unsigned char *hdr, int size)
+{
+ int statsn, flags, response, status;
+ struct iscsi_scsi_cbdata *scsi_cbdata = pdu->scsi_cbdata;
+ struct scsi_task *task = scsi_cbdata->task;
+
+ statsn = ntohl(*(uint32_t *)&hdr[24]);
+ if (statsn > (int)iscsi->statsn) {
+ iscsi->statsn = statsn;
+ }
+
+ flags = hdr[1];
+ if ((flags&ISCSI_PDU_DATA_FINAL) == 0) {
+ printf("scsi response pdu but Final bit is not set: 0x%02x\n", flags);
+ pdu->callback(iscsi, ISCSI_STATUS_ERROR, task, pdu->private_data);
+ return -1;
+ }
+ if ((flags&ISCSI_PDU_DATA_ACK_REQUESTED) != 0) {
+ printf("scsi response asked for ACK 0x%02x\n", flags);
+ pdu->callback(iscsi, ISCSI_STATUS_ERROR, task, pdu->private_data);
+ return -1;
+ }
+ /* for now, we ignore all overflow/underflow flags. We just print/log them so we can tweak
+ * libiscsi to not generate under/over flows
+ */
+ if ((flags&ISCSI_PDU_DATA_BIDIR_OVERFLOW) != 0) {
+ printf("scsi response contains bidir overflow 0x%02x\n", flags);
+ }
+ if ((flags&ISCSI_PDU_DATA_BIDIR_UNDERFLOW) != 0) {
+ printf("scsi response contains bidir underflow 0x%02x\n", flags);
+ }
+ if ((flags&ISCSI_PDU_DATA_RESIDUAL_OVERFLOW) != 0) {
+ printf("scsi response contains residual overflow 0x%02x\n", flags);
+ }
+ if ((flags&ISCSI_PDU_DATA_RESIDUAL_UNDERFLOW) != 0) {
+ printf("scsi response contains residual underflow 0x%02x\n", flags);
+ }
+
+
+ response = hdr[2];
+ if (response != 0x00) {
+ printf("scsi reply response field:%d\n", response);
+ }
+
+ status = hdr[3];
+
+ switch (status) {
+ case ISCSI_STATUS_GOOD:
+ task->datain.data = pdu->indata.data;
+ task->datain.size = pdu->indata.size;
+
+ pdu->callback(iscsi, ISCSI_STATUS_GOOD, &pdu->indata, pdu->private_data);
+ break;
+ case ISCSI_STATUS_CHECK_CONDITION:
+ task->datain.data = discard_const(hdr + ISCSI_HEADER_SIZE);
+ task->datain.size = size - ISCSI_HEADER_SIZE;
+
+ task->sense.error_type = task->datain.data[2] & 0x7f;
+ task->sense.key = task->datain.data[4] & 0x0f;
+ task->sense.ascq = ntohs(*(uint16_t *)&(task->datain.data[14]));
+
+ pdu->callback(iscsi, ISCSI_STATUS_CHECK_CONDITION, task, pdu->private_data);
+ break;
+ default:
+ printf("Unknown status :%d\n", status);
+
+ pdu->callback(iscsi, ISCSI_STATUS_ERROR, task, pdu->private_data);
+ return -1;
+ }
+
+ return 0;
+}
+
+int iscsi_process_scsi_data_in(struct iscsi_context *iscsi, struct iscsi_pdu *pdu, const unsigned char *hdr, int size, int *is_finished)
+{
+ int statsn, flags, status;
+ struct iscsi_scsi_cbdata *scsi_cbdata = pdu->scsi_cbdata;
+ struct scsi_task *task = scsi_cbdata->task;
+ int dsl;
+
+ statsn = ntohl(*(uint32_t *)&hdr[24]);
+ if (statsn > (int)iscsi->statsn) {
+ iscsi->statsn = statsn;
+ }
+
+ flags = hdr[1];
+ if ((flags&ISCSI_PDU_DATA_ACK_REQUESTED) != 0) {
+ printf("scsi response asked for ACK 0x%02x\n", flags);
+ pdu->callback(iscsi, ISCSI_STATUS_ERROR, task, pdu->private_data);
+ return -1;
+ }
+ /* for now, we ignore all overflow/underflow flags. We just print/log them so we can tweak
+ * libiscsi to not generate under/over flows
+ */
+ if ((flags&ISCSI_PDU_DATA_RESIDUAL_OVERFLOW) != 0) {
+ printf("scsi response contains residual overflow 0x%02x\n", flags);
+ }
+ if ((flags&ISCSI_PDU_DATA_RESIDUAL_UNDERFLOW) != 0) {
+ printf("scsi response contains residual underflow 0x%02x\n", flags);
+ }
+
+ dsl = ntohl(*(uint32_t *)&hdr[4])&0x00ffffff;
+
+ if (dsl > size - ISCSI_HEADER_SIZE) {
+ printf ("dsl is :%d, while buffser size if %d\n", dsl, size - ISCSI_HEADER_SIZE);
+ }
+
+ if (iscsi_add_data(&pdu->indata, discard_const(hdr + ISCSI_HEADER_SIZE), dsl, 0) != 0) {
+ printf("failed to add data to pdu in buffer\n");
+ return -3;
+ }
+
+
+ if ((flags&ISCSI_PDU_DATA_FINAL) == 0) {
+ printf("scsi data-in without Final bit: 0x%02x\n", flags);
+ *is_finished = 0;
+ }
+ if ((flags&ISCSI_PDU_DATA_CONTAINS_STATUS) == 0) {
+ printf("scsi data-in without Status bit: 0x%02x\n", flags);
+ *is_finished = 0;
+ }
+
+ if (*is_finished == 0) {
+ return 0;
+ }
+
+
+ /* this was the final data-in packet in the sequence and it has the s-bit set, so invoke the
+ * callback.
+ */
+ status = hdr[3];
+ task->datain.data = pdu->indata.data;
+ task->datain.size = pdu->indata.size;
+
+ pdu->callback(iscsi, status, task, pdu->private_data);
+
+ return 0;
+}
+
+
+
+
+/*
+ * SCSI commands
+ */
+
+int iscsi_testunitready_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, void *private_data)
+{
+ struct scsi_task *task;
+ int ret;
+
+ if ((task = scsi_cdb_testunitready()) == NULL) {
+ printf("Failed to create testunitready cdb\n");
+ return -1;
+ }
+ ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);
+
+ return ret;
+}
+
+
+int iscsi_reportluns_async(struct iscsi_context *iscsi, iscsi_command_cb cb, int report_type, int alloc_len, void *private_data)
+{
+ struct scsi_task *task;
+ int ret;
+
+ if (alloc_len < 16) {
+ printf("Minimum allowed alloc len for reportluns is 16. You specified %d\n", alloc_len);
+ return -1;
+ }
+
+ if ((task = scsi_reportluns_cdb(report_type, alloc_len)) == NULL) {
+ printf("Failed to create reportluns cdb\n");
+ return -2;
+ }
+ /* report luns are always sent to lun 0 */
+ ret = iscsi_scsi_command_async(iscsi, 0, task, cb, NULL, private_data);
+
+ return ret;
+}
+
+int iscsi_inquiry_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, int evpd, int page_code, int maxsize, void *private_data)
+{
+ struct scsi_task *task;
+ int ret;
+
+ if ((task = scsi_cdb_inquiry(evpd, page_code, maxsize)) == NULL) {
+ printf("Failed to create inquiry cdb\n");
+ return -1;
+ }
+ ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);
+
+ return ret;
+}
+
+int iscsi_readcapacity10_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, int lba, int pmi, void *private_data)
+{
+ struct scsi_task *task;
+ int ret;
+
+ if ((task = scsi_cdb_readcapacity10(lba, pmi)) == NULL) {
+ printf("Failed to create readcapacity10 cdb\n");
+ return -1;
+ }
+ ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);
+
+ return ret;
+}
+
+int iscsi_read10_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, int lba, int datalen, int blocksize, void *private_data)
+{
+ struct scsi_task *task;
+ int ret;
+
+ if (datalen % blocksize != 0) {
+ printf("datalen:%d is not a multiple of the blocksize:%d\n", datalen, blocksize);
+ return -1;
+ }
+
+ if ((task = scsi_cdb_read10(lba, datalen, blocksize)) == NULL) {
+ printf("Failed to create read10 cdb\n");
+ return -2;
+ }
+ ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);
+
+ return ret;
+}
+
+
+int iscsi_write10_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, unsigned char *data, int datalen, int lba, int fua, int fuanv, int blocksize, void *private_data)
+{
+ struct scsi_task *task;
+ struct iscsi_data outdata;
+ int ret;
+
+ if (datalen % blocksize != 0) {
+ printf("datalen:%d is not a multiple of the blocksize:%d\n", datalen, blocksize);
+ return -1;
+ }
+
+ if ((task = scsi_cdb_write10(lba, datalen, fua, fuanv, blocksize)) == NULL) {
+ printf("Failed to create read10 cdb\n");
+ return -2;
+ }
+
+ outdata.data = data;
+ outdata.size = datalen;
+
+ ret = iscsi_scsi_command_async(iscsi, lun, task, cb, &outdata, private_data);
+
+ return ret;
+}
+
+int iscsi_modesense6_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, int dbd, int pc, int page_code, int sub_page_code, unsigned char alloc_len, void *private_data)
+{
+ struct scsi_task *task;
+ int ret;
+
+ if ((task = scsi_cdb_modesense6(dbd, pc, page_code, sub_page_code, alloc_len)) == NULL) {
+ printf("Failed to create modesense6 cdb\n");
+ return -2;
+ }
+ ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);
+
+ return ret;
+}
+
projects / ccan / blobdiff