--- /dev/null
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * 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 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <assert.h>
+#include <byteswap.h>
+#include <ipxe/vsprintf.h>
+#include <ipxe/socket.h>
+#include <ipxe/iobuf.h>
+#include <ipxe/uri.h>
+#include <ipxe/xfer.h>
+#include <ipxe/open.h>
+#include <ipxe/scsi.h>
+#include <ipxe/process.h>
+#include <ipxe/uaccess.h>
+#include <ipxe/tcpip.h>
+#include <ipxe/settings.h>
+#include <ipxe/features.h>
+#include <ipxe/base16.h>
+#include <ipxe/base64.h>
+#include <ipxe/ibft.h>
+#include <ipxe/iscsi.h>
+
+/** @file
+ *
+ * iSCSI protocol
+ *
+ */
+
+FEATURE ( FEATURE_PROTOCOL, "iSCSI", DHCP_EB_FEATURE_ISCSI, 1 );
+
+/* Disambiguate the various error causes */
+#define EACCES_INCORRECT_TARGET_USERNAME \
+ __einfo_error ( EINFO_EACCES_INCORRECT_TARGET_USERNAME )
+#define EINFO_EACCES_INCORRECT_TARGET_USERNAME \
+ __einfo_uniqify ( EINFO_EACCES, 0x01, "Incorrect target username" )
+#define EACCES_INCORRECT_TARGET_PASSWORD \
+ __einfo_error ( EINFO_EACCES_INCORRECT_TARGET_PASSWORD )
+#define EINFO_EACCES_INCORRECT_TARGET_PASSWORD \
+ __einfo_uniqify ( EINFO_EACCES, 0x02, "Incorrect target password" )
+#define EINVAL_ROOT_PATH_TOO_SHORT \
+ __einfo_error ( EINFO_EINVAL_ROOT_PATH_TOO_SHORT )
+#define EINFO_EINVAL_ROOT_PATH_TOO_SHORT \
+ __einfo_uniqify ( EINFO_EINVAL, 0x01, "Root path too short" )
+#define EINVAL_BAD_CREDENTIAL_MIX \
+ __einfo_error ( EINFO_EINVAL_BAD_CREDENTIAL_MIX )
+#define EINFO_EINVAL_BAD_CREDENTIAL_MIX \
+ __einfo_uniqify ( EINFO_EINVAL, 0x02, "Bad credential mix" )
+#define EINVAL_NO_ROOT_PATH \
+ __einfo_error ( EINFO_EINVAL_NO_ROOT_PATH )
+#define EINFO_EINVAL_NO_ROOT_PATH \
+ __einfo_uniqify ( EINFO_EINVAL, 0x03, "No root path" )
+#define EINVAL_NO_TARGET_IQN \
+ __einfo_error ( EINFO_EINVAL_NO_TARGET_IQN )
+#define EINFO_EINVAL_NO_TARGET_IQN \
+ __einfo_uniqify ( EINFO_EINVAL, 0x04, "No target IQN" )
+#define EINVAL_NO_INITIATOR_IQN \
+ __einfo_error ( EINFO_EINVAL_NO_INITIATOR_IQN )
+#define EINFO_EINVAL_NO_INITIATOR_IQN \
+ __einfo_uniqify ( EINFO_EINVAL, 0x05, "No initiator IQN" )
+#define EIO_TARGET_UNAVAILABLE \
+ __einfo_error ( EINFO_EIO_TARGET_UNAVAILABLE )
+#define EINFO_EIO_TARGET_UNAVAILABLE \
+ __einfo_uniqify ( EINFO_EIO, 0x01, "Target not currently operational" )
+#define EIO_TARGET_NO_RESOURCES \
+ __einfo_error ( EINFO_EIO_TARGET_NO_RESOURCES )
+#define EINFO_EIO_TARGET_NO_RESOURCES \
+ __einfo_uniqify ( EINFO_EIO, 0x02, "Target out of resources" )
+#define ENOTSUP_INITIATOR_STATUS \
+ __einfo_error ( EINFO_ENOTSUP_INITIATOR_STATUS )
+#define EINFO_ENOTSUP_INITIATOR_STATUS \
+ __einfo_uniqify ( EINFO_ENOTSUP, 0x01, "Unsupported initiator status" )
+#define ENOTSUP_OPCODE \
+ __einfo_error ( EINFO_ENOTSUP_OPCODE )
+#define EINFO_ENOTSUP_OPCODE \
+ __einfo_uniqify ( EINFO_ENOTSUP, 0x02, "Unsupported opcode" )
+#define ENOTSUP_DISCOVERY \
+ __einfo_error ( EINFO_ENOTSUP_DISCOVERY )
+#define EINFO_ENOTSUP_DISCOVERY \
+ __einfo_uniqify ( EINFO_ENOTSUP, 0x03, "Discovery not supported" )
+#define ENOTSUP_TARGET_STATUS \
+ __einfo_error ( EINFO_ENOTSUP_TARGET_STATUS )
+#define EINFO_ENOTSUP_TARGET_STATUS \
+ __einfo_uniqify ( EINFO_ENOTSUP, 0x04, "Unsupported target status" )
+#define ENOTSUP_NOP_IN \
+ __einfo_error ( EINFO_ENOTSUP_NOP_IN )
+#define EINFO_ENOTSUP_NOP_IN \
+ __einfo_uniqify ( EINFO_ENOTSUP, 0x05, "Unsupported NOP-In received" )
+#define EPERM_INITIATOR_AUTHENTICATION \
+ __einfo_error ( EINFO_EPERM_INITIATOR_AUTHENTICATION )
+#define EINFO_EPERM_INITIATOR_AUTHENTICATION \
+ __einfo_uniqify ( EINFO_EPERM, 0x01, "Initiator authentication failed" )
+#define EPERM_INITIATOR_AUTHORISATION \
+ __einfo_error ( EINFO_EPERM_INITIATOR_AUTHORISATION )
+#define EINFO_EPERM_INITIATOR_AUTHORISATION \
+ __einfo_uniqify ( EINFO_EPERM, 0x02, "Initiator not authorised" )
+#define EPROTO_INVALID_CHAP_ALGORITHM \
+ __einfo_error ( EINFO_EPROTO_INVALID_CHAP_ALGORITHM )
+#define EINFO_EPROTO_INVALID_CHAP_ALGORITHM \
+ __einfo_uniqify ( EINFO_EPROTO, 0x01, "Invalid CHAP algorithm" )
+#define EPROTO_INVALID_CHAP_IDENTIFIER \
+ __einfo_error ( EINFO_EPROTO_INVALID_CHAP_IDENTIFIER )
+#define EINFO_EPROTO_INVALID_CHAP_IDENTIFIER \
+ __einfo_uniqify ( EINFO_EPROTO, 0x02, "Invalid CHAP identifier" )
+#define EPROTO_INVALID_LARGE_BINARY \
+ __einfo_error ( EINFO_EPROTO_INVALID_LARGE_BINARY )
+#define EINFO_EPROTO_INVALID_LARGE_BINARY \
+ __einfo_uniqify ( EINFO_EPROTO, 0x03, "Invalid large binary" )
+#define EPROTO_INVALID_CHAP_RESPONSE \
+ __einfo_error ( EINFO_EPROTO_INVALID_CHAP_RESPONSE )
+#define EINFO_EPROTO_INVALID_CHAP_RESPONSE \
+ __einfo_uniqify ( EINFO_EPROTO, 0x04, "Invalid CHAP response" )
+#define EPROTO_INVALID_KEY_VALUE_PAIR \
+ __einfo_error ( EINFO_EPROTO_INVALID_KEY_VALUE_PAIR )
+#define EINFO_EPROTO_INVALID_KEY_VALUE_PAIR \
+ __einfo_uniqify ( EINFO_EPROTO, 0x05, "Invalid key/value pair" )
+#define EPROTO_VALUE_REJECTED \
+ __einfo_error ( EINFO_EPROTO_VALUE_REJECTED )
+#define EINFO_EPROTO_VALUE_REJECTED \
+ __einfo_uniqify ( EINFO_EPROTO, 0x06, "Parameter rejected" )
+
+static void iscsi_start_tx ( struct iscsi_session *iscsi );
+static void iscsi_start_login ( struct iscsi_session *iscsi );
+static void iscsi_start_data_out ( struct iscsi_session *iscsi,
+ unsigned int datasn );
+
+/**
+ * Finish receiving PDU data into buffer
+ *
+ * @v iscsi iSCSI session
+ */
+static void iscsi_rx_buffered_data_done ( struct iscsi_session *iscsi ) {
+ free ( iscsi->rx_buffer );
+ iscsi->rx_buffer = NULL;
+}
+
+/**
+ * Receive PDU data into buffer
+ *
+ * @v iscsi iSCSI session
+ * @v data Data to receive
+ * @v len Length of data
+ * @ret rc Return status code
+ *
+ * This can be used when the RX PDU type handler wishes to buffer up
+ * all received data and process the PDU as a single unit. The caller
+ * is repsonsible for calling iscsi_rx_buffered_data_done() after
+ * processing the data.
+ */
+static int iscsi_rx_buffered_data ( struct iscsi_session *iscsi,
+ const void *data, size_t len ) {
+
+ /* Allocate buffer on first call */
+ if ( ! iscsi->rx_buffer ) {
+ iscsi->rx_buffer = malloc ( iscsi->rx_len );
+ if ( ! iscsi->rx_buffer )
+ return -ENOMEM;
+ }
+
+ /* Copy data to buffer */
+ assert ( ( iscsi->rx_offset + len ) <= iscsi->rx_len );
+ memcpy ( ( iscsi->rx_buffer + iscsi->rx_offset ), data, len );
+
+ return 0;
+}
+
+/**
+ * Free iSCSI session
+ *
+ * @v refcnt Reference counter
+ */
+static void iscsi_free ( struct refcnt *refcnt ) {
+ struct iscsi_session *iscsi =
+ container_of ( refcnt, struct iscsi_session, refcnt );
+
+ free ( iscsi->initiator_iqn );
+ free ( iscsi->target_address );
+ free ( iscsi->target_iqn );
+ free ( iscsi->initiator_username );
+ free ( iscsi->initiator_password );
+ free ( iscsi->target_username );
+ free ( iscsi->target_password );
+ chap_finish ( &iscsi->chap );
+ iscsi_rx_buffered_data_done ( iscsi );
+ free ( iscsi->command );
+ free ( iscsi );
+}
+
+/**
+ * Shut down iSCSI interface
+ *
+ * @v iscsi iSCSI session
+ * @v rc Reason for close
+ */
+static void iscsi_close ( struct iscsi_session *iscsi, int rc ) {
+
+ /* A TCP graceful close is still an error from our point of view */
+ if ( rc == 0 )
+ rc = -ECONNRESET;
+
+ DBGC ( iscsi, "iSCSI %p closed: %s\n", iscsi, strerror ( rc ) );
+
+ /* Stop transmission process */
+ process_del ( &iscsi->process );
+
+ /* Shut down interfaces */
+ intf_shutdown ( &iscsi->socket, rc );
+ intf_shutdown ( &iscsi->control, rc );
+ intf_shutdown ( &iscsi->data, rc );
+}
+
+/**
+ * Assign new iSCSI initiator task tag
+ *
+ * @v iscsi iSCSI session
+ */
+static void iscsi_new_itt ( struct iscsi_session *iscsi ) {
+ static uint16_t itt_idx;
+
+ iscsi->itt = ( ISCSI_TAG_MAGIC | (++itt_idx) );
+}
+
+/**
+ * Open iSCSI transport-layer connection
+ *
+ * @v iscsi iSCSI session
+ * @ret rc Return status code
+ */
+static int iscsi_open_connection ( struct iscsi_session *iscsi ) {
+ struct sockaddr_tcpip target;
+ int rc;
+
+ assert ( iscsi->tx_state == ISCSI_TX_IDLE );
+ assert ( iscsi->rx_state == ISCSI_RX_BHS );
+ assert ( iscsi->rx_offset == 0 );
+
+ /* Open socket */
+ memset ( &target, 0, sizeof ( target ) );
+ target.st_port = htons ( iscsi->target_port );
+ if ( ( rc = xfer_open_named_socket ( &iscsi->socket, SOCK_STREAM,
+ ( struct sockaddr * ) &target,
+ iscsi->target_address,
+ NULL ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not open socket: %s\n",
+ iscsi, strerror ( rc ) );
+ return rc;
+ }
+
+ /* Enter security negotiation phase */
+ iscsi->status = ( ISCSI_STATUS_SECURITY_NEGOTIATION_PHASE |
+ ISCSI_STATUS_STRINGS_SECURITY );
+ if ( iscsi->target_username )
+ iscsi->status |= ISCSI_STATUS_AUTH_REVERSE_REQUIRED;
+
+ /* Assign new ISID */
+ iscsi->isid_iana_qual = ( random() & 0xffff );
+
+ /* Assign fresh initiator task tag */
+ iscsi_new_itt ( iscsi );
+
+ /* Initiate login */
+ iscsi_start_login ( iscsi );
+
+ return 0;
+}
+
+/**
+ * Close iSCSI transport-layer connection
+ *
+ * @v iscsi iSCSI session
+ * @v rc Reason for close
+ *
+ * Closes the transport-layer connection and resets the session state
+ * ready to attempt a fresh login.
+ */
+static void iscsi_close_connection ( struct iscsi_session *iscsi, int rc ) {
+
+ /* Close all data transfer interfaces */
+ intf_restart ( &iscsi->socket, rc );
+
+ /* Clear connection status */
+ iscsi->status = 0;
+
+ /* Reset TX and RX state machines */
+ iscsi->tx_state = ISCSI_TX_IDLE;
+ iscsi->rx_state = ISCSI_RX_BHS;
+ iscsi->rx_offset = 0;
+
+ /* Free any temporary dynamically allocated memory */
+ chap_finish ( &iscsi->chap );
+ iscsi_rx_buffered_data_done ( iscsi );
+}
+
+/**
+ * Mark iSCSI SCSI operation as complete
+ *
+ * @v iscsi iSCSI session
+ * @v rc Return status code
+ * @v rsp SCSI response, if any
+ *
+ * Note that iscsi_scsi_done() will not close the connection, and must
+ * therefore be called only when the internal state machines are in an
+ * appropriate state, otherwise bad things may happen on the next call
+ * to iscsi_scsi_command(). The general rule is to call
+ * iscsi_scsi_done() only at the end of receiving a PDU; at this point
+ * the TX and RX engines should both be idle.
+ */
+static void iscsi_scsi_done ( struct iscsi_session *iscsi, int rc,
+ struct scsi_rsp *rsp ) {
+ uint32_t itt = iscsi->itt;
+
+ assert ( iscsi->tx_state == ISCSI_TX_IDLE );
+
+ /* Clear command */
+ free ( iscsi->command );
+ iscsi->command = NULL;
+
+ /* Send SCSI response, if any */
+ if ( rsp )
+ scsi_response ( &iscsi->data, rsp );
+
+ /* Close SCSI command, if this is still the same command. (It
+ * is possible that the command interface has already been
+ * closed as a result of the SCSI response we sent.)
+ */
+ if ( iscsi->itt == itt )
+ intf_restart ( &iscsi->data, rc );
+}
+
+/****************************************************************************
+ *
+ * iSCSI SCSI command issuing
+ *
+ */
+
+/**
+ * Build iSCSI SCSI command BHS
+ *
+ * @v iscsi iSCSI session
+ *
+ * We don't currently support bidirectional commands (i.e. with both
+ * Data-In and Data-Out segments); these would require providing code
+ * to generate an AHS, and there doesn't seem to be any need for it at
+ * the moment.
+ */
+static void iscsi_start_command ( struct iscsi_session *iscsi ) {
+ struct iscsi_bhs_scsi_command *command = &iscsi->tx_bhs.scsi_command;
+
+ assert ( ! ( iscsi->command->data_in && iscsi->command->data_out ) );
+
+ /* Construct BHS and initiate transmission */
+ iscsi_start_tx ( iscsi );
+ command->opcode = ISCSI_OPCODE_SCSI_COMMAND;
+ command->flags = ( ISCSI_FLAG_FINAL |
+ ISCSI_COMMAND_ATTR_SIMPLE );
+ if ( iscsi->command->data_in )
+ command->flags |= ISCSI_COMMAND_FLAG_READ;
+ if ( iscsi->command->data_out )
+ command->flags |= ISCSI_COMMAND_FLAG_WRITE;
+ /* lengths left as zero */
+ memcpy ( &command->lun, &iscsi->command->lun,
+ sizeof ( command->lun ) );
+ command->itt = htonl ( iscsi->itt );
+ command->exp_len = htonl ( iscsi->command->data_in_len |
+ iscsi->command->data_out_len );
+ command->cmdsn = htonl ( iscsi->cmdsn );
+ command->expstatsn = htonl ( iscsi->statsn + 1 );
+ memcpy ( &command->cdb, &iscsi->command->cdb, sizeof ( command->cdb ));
+ DBGC2 ( iscsi, "iSCSI %p start " SCSI_CDB_FORMAT " %s %#zx\n",
+ iscsi, SCSI_CDB_DATA ( command->cdb ),
+ ( iscsi->command->data_in ? "in" : "out" ),
+ ( iscsi->command->data_in ?
+ iscsi->command->data_in_len :
+ iscsi->command->data_out_len ) );
+}
+
+/**
+ * Receive data segment of an iSCSI SCSI response PDU
+ *
+ * @v iscsi iSCSI session
+ * @v data Received data
+ * @v len Length of received data
+ * @v remaining Data remaining after this data
+ * @ret rc Return status code
+ */
+static int iscsi_rx_scsi_response ( struct iscsi_session *iscsi,
+ const void *data, size_t len,
+ size_t remaining ) {
+ struct iscsi_bhs_scsi_response *response
+ = &iscsi->rx_bhs.scsi_response;
+ struct scsi_rsp rsp;
+ uint32_t residual_count;
+ size_t data_len;
+ int rc;
+
+ /* Buffer up the PDU data */
+ if ( ( rc = iscsi_rx_buffered_data ( iscsi, data, len ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not buffer SCSI response: %s\n",
+ iscsi, strerror ( rc ) );
+ return rc;
+ }
+ if ( remaining )
+ return 0;
+
+ /* Parse SCSI response and discard buffer */
+ memset ( &rsp, 0, sizeof ( rsp ) );
+ rsp.status = response->status;
+ residual_count = ntohl ( response->residual_count );
+ if ( response->flags & ISCSI_DATA_FLAG_OVERFLOW ) {
+ rsp.overrun = residual_count;
+ } else if ( response->flags & ISCSI_DATA_FLAG_UNDERFLOW ) {
+ rsp.overrun = -(residual_count);
+ }
+ data_len = ISCSI_DATA_LEN ( response->lengths );
+ if ( data_len ) {
+ scsi_parse_sense ( ( iscsi->rx_buffer + 2 ), ( data_len - 2 ),
+ &rsp.sense );
+ }
+ iscsi_rx_buffered_data_done ( iscsi );
+
+ /* Check for errors */
+ if ( response->response != ISCSI_RESPONSE_COMMAND_COMPLETE )
+ return -EIO;
+
+ /* Mark as completed */
+ iscsi_scsi_done ( iscsi, 0, &rsp );
+ return 0;
+}
+
+/**
+ * Receive data segment of an iSCSI data-in PDU
+ *
+ * @v iscsi iSCSI session
+ * @v data Received data
+ * @v len Length of received data
+ * @v remaining Data remaining after this data
+ * @ret rc Return status code
+ */
+static int iscsi_rx_data_in ( struct iscsi_session *iscsi,
+ const void *data, size_t len,
+ size_t remaining ) {
+ struct iscsi_bhs_data_in *data_in = &iscsi->rx_bhs.data_in;
+ unsigned long offset;
+
+ /* Copy data to data-in buffer */
+ offset = ntohl ( data_in->offset ) + iscsi->rx_offset;
+ assert ( iscsi->command != NULL );
+ assert ( iscsi->command->data_in );
+ assert ( ( offset + len ) <= iscsi->command->data_in_len );
+ copy_to_user ( iscsi->command->data_in, offset, data, len );
+
+ /* Wait for whole SCSI response to arrive */
+ if ( remaining )
+ return 0;
+
+ /* Mark as completed if status is present */
+ if ( data_in->flags & ISCSI_DATA_FLAG_STATUS ) {
+ assert ( ( offset + len ) == iscsi->command->data_in_len );
+ assert ( data_in->flags & ISCSI_FLAG_FINAL );
+ /* iSCSI cannot return an error status via a data-in */
+ iscsi_scsi_done ( iscsi, 0, NULL );
+ }
+
+ return 0;
+}
+
+/**
+ * Receive data segment of an iSCSI R2T PDU
+ *
+ * @v iscsi iSCSI session
+ * @v data Received data
+ * @v len Length of received data
+ * @v remaining Data remaining after this data
+ * @ret rc Return status code
+ */
+static int iscsi_rx_r2t ( struct iscsi_session *iscsi,
+ const void *data __unused, size_t len __unused,
+ size_t remaining __unused ) {
+ struct iscsi_bhs_r2t *r2t = &iscsi->rx_bhs.r2t;
+
+ /* Record transfer parameters and trigger first data-out */
+ iscsi->ttt = ntohl ( r2t->ttt );
+ iscsi->transfer_offset = ntohl ( r2t->offset );
+ iscsi->transfer_len = ntohl ( r2t->len );
+ iscsi_start_data_out ( iscsi, 0 );
+
+ return 0;
+}
+
+/**
+ * Build iSCSI data-out BHS
+ *
+ * @v iscsi iSCSI session
+ * @v datasn Data sequence number within the transfer
+ *
+ */
+static void iscsi_start_data_out ( struct iscsi_session *iscsi,
+ unsigned int datasn ) {
+ struct iscsi_bhs_data_out *data_out = &iscsi->tx_bhs.data_out;
+ unsigned long offset;
+ unsigned long remaining;
+ unsigned long len;
+
+ /* We always send 512-byte Data-Out PDUs; this removes the
+ * need to worry about the target's MaxRecvDataSegmentLength.
+ */
+ offset = datasn * 512;
+ remaining = iscsi->transfer_len - offset;
+ len = remaining;
+ if ( len > 512 )
+ len = 512;
+
+ /* Construct BHS and initiate transmission */
+ iscsi_start_tx ( iscsi );
+ data_out->opcode = ISCSI_OPCODE_DATA_OUT;
+ if ( len == remaining )
+ data_out->flags = ( ISCSI_FLAG_FINAL );
+ ISCSI_SET_LENGTHS ( data_out->lengths, 0, len );
+ data_out->lun = iscsi->command->lun;
+ data_out->itt = htonl ( iscsi->itt );
+ data_out->ttt = htonl ( iscsi->ttt );
+ data_out->expstatsn = htonl ( iscsi->statsn + 1 );
+ data_out->datasn = htonl ( datasn );
+ data_out->offset = htonl ( iscsi->transfer_offset + offset );
+ DBGC ( iscsi, "iSCSI %p start data out DataSN %#x len %#lx\n",
+ iscsi, datasn, len );
+}
+
+/**
+ * Complete iSCSI data-out PDU transmission
+ *
+ * @v iscsi iSCSI session
+ *
+ */
+static void iscsi_data_out_done ( struct iscsi_session *iscsi ) {
+ struct iscsi_bhs_data_out *data_out = &iscsi->tx_bhs.data_out;
+
+ /* If we haven't reached the end of the sequence, start
+ * sending the next data-out PDU.
+ */
+ if ( ! ( data_out->flags & ISCSI_FLAG_FINAL ) )
+ iscsi_start_data_out ( iscsi, ntohl ( data_out->datasn ) + 1 );
+}
+
+/**
+ * Send iSCSI data-out data segment
+ *
+ * @v iscsi iSCSI session
+ * @ret rc Return status code
+ */
+static int iscsi_tx_data_out ( struct iscsi_session *iscsi ) {
+ struct iscsi_bhs_data_out *data_out = &iscsi->tx_bhs.data_out;
+ struct io_buffer *iobuf;
+ unsigned long offset;
+ size_t len;
+ size_t pad_len;
+
+ offset = ntohl ( data_out->offset );
+ len = ISCSI_DATA_LEN ( data_out->lengths );
+ pad_len = ISCSI_DATA_PAD_LEN ( data_out->lengths );
+
+ assert ( iscsi->command != NULL );
+ assert ( iscsi->command->data_out );
+ assert ( ( offset + len ) <= iscsi->command->data_out_len );
+
+ iobuf = xfer_alloc_iob ( &iscsi->socket, ( len + pad_len ) );
+ if ( ! iobuf )
+ return -ENOMEM;
+
+ copy_from_user ( iob_put ( iobuf, len ),
+ iscsi->command->data_out, offset, len );
+ memset ( iob_put ( iobuf, pad_len ), 0, pad_len );
+
+ return xfer_deliver_iob ( &iscsi->socket, iobuf );
+}
+
+/**
+ * Receive data segment of an iSCSI NOP-In
+ *
+ * @v iscsi iSCSI session
+ * @v data Received data
+ * @v len Length of received data
+ * @v remaining Data remaining after this data
+ * @ret rc Return status code
+ */
+static int iscsi_rx_nop_in ( struct iscsi_session *iscsi,
+ const void *data __unused, size_t len __unused,
+ size_t remaining __unused ) {
+ struct iscsi_nop_in *nop_in = &iscsi->rx_bhs.nop_in;
+
+ DBGC2 ( iscsi, "iSCSI %p received NOP-In\n", iscsi );
+
+ /* We don't currently have the ability to respond to NOP-Ins
+ * sent as ping requests, but we can happily accept NOP-Ins
+ * sent merely to update CmdSN.
+ */
+ if ( nop_in->ttt != htonl ( ISCSI_TAG_RESERVED ) ) {
+ DBGC ( iscsi, "iSCSI %p received unsupported NOP-In with TTT "
+ "%08x\n", iscsi, ntohl ( nop_in->ttt ) );
+ return -ENOTSUP_NOP_IN;
+ }
+
+ return 0;
+}
+
+/****************************************************************************
+ *
+ * iSCSI login
+ *
+ */
+
+/**
+ * Build iSCSI login request strings
+ *
+ * @v iscsi iSCSI session
+ *
+ * These are the initial set of strings sent in the first login
+ * request PDU. We want the following settings:
+ *
+ * HeaderDigest=None
+ * DataDigest=None
+ * MaxConnections is irrelevant; we make only one connection anyway [4]
+ * InitialR2T=Yes [1]
+ * ImmediateData is irrelevant; we never send immediate data [4]
+ * MaxRecvDataSegmentLength=8192 (default; we don't care) [3]
+ * MaxBurstLength=262144 (default; we don't care) [3]
+ * FirstBurstLength=262144 (default; we don't care)
+ * DefaultTime2Wait=0 [2]
+ * DefaultTime2Retain=0 [2]
+ * MaxOutstandingR2T=1
+ * DataPDUInOrder=Yes
+ * DataSequenceInOrder=Yes
+ * ErrorRecoveryLevel=0
+ *
+ * [1] InitialR2T has an OR resolution function, so the target may
+ * force us to use it. We therefore simplify our logic by always
+ * using it.
+ *
+ * [2] These ensure that we can safely start a new task once we have
+ * reconnected after a failure, without having to manually tidy up
+ * after the old one.
+ *
+ * [3] We are quite happy to use the RFC-defined default values for
+ * these parameters, but some targets (notably OpenSolaris)
+ * incorrectly assume a default value of zero, so we explicitly
+ * specify the default values.
+ *
+ * [4] We are quite happy to use the RFC-defined default values for
+ * these parameters, but some targets (notably a QNAP TS-639Pro) fail
+ * unless they are supplied, so we explicitly specify the default
+ * values.
+ */
+static int iscsi_build_login_request_strings ( struct iscsi_session *iscsi,
+ void *data, size_t len ) {
+ unsigned int used = 0;
+ const char *auth_method;
+
+ if ( iscsi->status & ISCSI_STATUS_STRINGS_SECURITY ) {
+ /* Default to allowing no authentication */
+ auth_method = "None";
+ /* If we have a credential to supply, permit CHAP */
+ if ( iscsi->initiator_username )
+ auth_method = "CHAP,None";
+ /* If we have a credential to check, force CHAP */
+ if ( iscsi->target_username )
+ auth_method = "CHAP";
+ used += ssnprintf ( data + used, len - used,
+ "InitiatorName=%s%c"
+ "TargetName=%s%c"
+ "SessionType=Normal%c"
+ "AuthMethod=%s%c",
+ iscsi->initiator_iqn, 0,
+ iscsi->target_iqn, 0, 0,
+ auth_method, 0 );
+ }
+
+ if ( iscsi->status & ISCSI_STATUS_STRINGS_CHAP_ALGORITHM ) {
+ used += ssnprintf ( data + used, len - used, "CHAP_A=5%c", 0 );
+ }
+
+ if ( ( iscsi->status & ISCSI_STATUS_STRINGS_CHAP_RESPONSE ) ) {
+ char buf[ base16_encoded_len ( iscsi->chap.response_len ) + 1 ];
+ assert ( iscsi->initiator_username != NULL );
+ base16_encode ( iscsi->chap.response, iscsi->chap.response_len,
+ buf );
+ used += ssnprintf ( data + used, len - used,
+ "CHAP_N=%s%cCHAP_R=0x%s%c",
+ iscsi->initiator_username, 0, buf, 0 );
+ }
+
+ if ( ( iscsi->status & ISCSI_STATUS_STRINGS_CHAP_CHALLENGE ) ) {
+ size_t challenge_len = ( sizeof ( iscsi->chap_challenge ) - 1 );
+ char buf[ base16_encoded_len ( challenge_len ) + 1 ];
+ base16_encode ( ( iscsi->chap_challenge + 1 ), challenge_len,
+ buf );
+ used += ssnprintf ( data + used, len - used,
+ "CHAP_I=%d%cCHAP_C=0x%s%c",
+ iscsi->chap_challenge[0], 0, buf, 0 );
+ }
+
+ if ( iscsi->status & ISCSI_STATUS_STRINGS_OPERATIONAL ) {
+ used += ssnprintf ( data + used, len - used,
+ "HeaderDigest=None%c"
+ "DataDigest=None%c"
+ "MaxConnections=1%c"
+ "InitialR2T=Yes%c"
+ "ImmediateData=No%c"
+ "MaxRecvDataSegmentLength=8192%c"
+ "MaxBurstLength=262144%c"
+ "DefaultTime2Wait=0%c"
+ "DefaultTime2Retain=0%c"
+ "MaxOutstandingR2T=1%c"
+ "DataPDUInOrder=Yes%c"
+ "DataSequenceInOrder=Yes%c"
+ "ErrorRecoveryLevel=0%c",
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 );
+ }
+
+ return used;
+}
+
+/**
+ * Build iSCSI login request BHS
+ *
+ * @v iscsi iSCSI session
+ */
+static void iscsi_start_login ( struct iscsi_session *iscsi ) {
+ struct iscsi_bhs_login_request *request = &iscsi->tx_bhs.login_request;
+ int len;
+
+ switch ( iscsi->status & ISCSI_LOGIN_CSG_MASK ) {
+ case ISCSI_LOGIN_CSG_SECURITY_NEGOTIATION:
+ DBGC ( iscsi, "iSCSI %p entering security negotiation\n",
+ iscsi );
+ break;
+ case ISCSI_LOGIN_CSG_OPERATIONAL_NEGOTIATION:
+ DBGC ( iscsi, "iSCSI %p entering operational negotiation\n",
+ iscsi );
+ break;
+ default:
+ assert ( 0 );
+ }
+
+ /* Construct BHS and initiate transmission */
+ iscsi_start_tx ( iscsi );
+ request->opcode = ( ISCSI_OPCODE_LOGIN_REQUEST |
+ ISCSI_FLAG_IMMEDIATE );
+ request->flags = ( ( iscsi->status & ISCSI_STATUS_PHASE_MASK ) |
+ ISCSI_LOGIN_FLAG_TRANSITION );
+ /* version_max and version_min left as zero */
+ len = iscsi_build_login_request_strings ( iscsi, NULL, 0 );
+ ISCSI_SET_LENGTHS ( request->lengths, 0, len );
+ request->isid_iana_en = htonl ( ISCSI_ISID_IANA |
+ IANA_EN_FEN_SYSTEMS );
+ request->isid_iana_qual = htons ( iscsi->isid_iana_qual );
+ /* tsih left as zero */
+ request->itt = htonl ( iscsi->itt );
+ /* cid left as zero */
+ request->cmdsn = htonl ( iscsi->cmdsn );
+ request->expstatsn = htonl ( iscsi->statsn + 1 );
+}
+
+/**
+ * Complete iSCSI login request PDU transmission
+ *
+ * @v iscsi iSCSI session
+ *
+ */
+static void iscsi_login_request_done ( struct iscsi_session *iscsi ) {
+
+ /* Clear any "strings to send" flags */
+ iscsi->status &= ~ISCSI_STATUS_STRINGS_MASK;
+
+ /* Free any dynamically allocated storage used for login */
+ chap_finish ( &iscsi->chap );
+}
+
+/**
+ * Transmit data segment of an iSCSI login request PDU
+ *
+ * @v iscsi iSCSI session
+ * @ret rc Return status code
+ *
+ * For login requests, the data segment consists of the login strings.
+ */
+static int iscsi_tx_login_request ( struct iscsi_session *iscsi ) {
+ struct iscsi_bhs_login_request *request = &iscsi->tx_bhs.login_request;
+ struct io_buffer *iobuf;
+ size_t len;
+ size_t pad_len;
+
+ len = ISCSI_DATA_LEN ( request->lengths );
+ pad_len = ISCSI_DATA_PAD_LEN ( request->lengths );
+ iobuf = xfer_alloc_iob ( &iscsi->socket, ( len + pad_len ) );
+ if ( ! iobuf )
+ return -ENOMEM;
+ iob_put ( iobuf, len );
+ iscsi_build_login_request_strings ( iscsi, iobuf->data, len );
+ memset ( iob_put ( iobuf, pad_len ), 0, pad_len );
+
+ return xfer_deliver_iob ( &iscsi->socket, iobuf );
+}
+
+/**
+ * Calculate maximum length of decoded large binary value
+ *
+ * @v encoded Encoded large binary value
+ * @v max_raw_len Maximum length of raw data
+ */
+static inline size_t
+iscsi_large_binary_decoded_max_len ( const char *encoded ) {
+ return ( strlen ( encoded ) ); /* Decoding never expands data */
+}
+
+/**
+ * Decode large binary value
+ *
+ * @v encoded Encoded large binary value
+ * @v raw Raw data
+ * @ret len Length of raw data, or negative error
+ */
+static int iscsi_large_binary_decode ( const char *encoded, uint8_t *raw ) {
+
+ if ( encoded[0] != '0' )
+ return -EPROTO_INVALID_LARGE_BINARY;
+
+ switch ( encoded[1] ) {
+ case 'x' :
+ case 'X' :
+ return base16_decode ( ( encoded + 2 ), raw );
+ case 'b' :
+ case 'B' :
+ return base64_decode ( ( encoded + 2 ), raw );
+ default:
+ return -EPROTO_INVALID_LARGE_BINARY;
+ }
+}
+
+/**
+ * Handle iSCSI TargetAddress text value
+ *
+ * @v iscsi iSCSI session
+ * @v value TargetAddress value
+ * @ret rc Return status code
+ */
+static int iscsi_handle_targetaddress_value ( struct iscsi_session *iscsi,
+ const char *value ) {
+ char *separator;
+
+ DBGC ( iscsi, "iSCSI %p will redirect to %s\n", iscsi, value );
+
+ /* Replace target address */
+ free ( iscsi->target_address );
+ iscsi->target_address = strdup ( value );
+ if ( ! iscsi->target_address )
+ return -ENOMEM;
+
+ /* Replace target port */
+ iscsi->target_port = htons ( ISCSI_PORT );
+ separator = strchr ( iscsi->target_address, ':' );
+ if ( separator ) {
+ *separator = '\0';
+ iscsi->target_port = strtoul ( ( separator + 1 ), NULL, 0 );
+ }
+
+ return 0;
+}
+
+/**
+ * Handle iSCSI AuthMethod text value
+ *
+ * @v iscsi iSCSI session
+ * @v value AuthMethod value
+ * @ret rc Return status code
+ */
+static int iscsi_handle_authmethod_value ( struct iscsi_session *iscsi,
+ const char *value ) {
+
+ /* If server requests CHAP, send the CHAP_A string */
+ if ( strcmp ( value, "CHAP" ) == 0 ) {
+ DBGC ( iscsi, "iSCSI %p initiating CHAP authentication\n",
+ iscsi );
+ iscsi->status |= ( ISCSI_STATUS_STRINGS_CHAP_ALGORITHM |
+ ISCSI_STATUS_AUTH_FORWARD_REQUIRED );
+ }
+
+ return 0;
+}
+
+/**
+ * Handle iSCSI CHAP_A text value
+ *
+ * @v iscsi iSCSI session
+ * @v value CHAP_A value
+ * @ret rc Return status code
+ */
+static int iscsi_handle_chap_a_value ( struct iscsi_session *iscsi,
+ const char *value ) {
+
+ /* We only ever offer "5" (i.e. MD5) as an algorithm, so if
+ * the server responds with anything else it is a protocol
+ * violation.
+ */
+ if ( strcmp ( value, "5" ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p got invalid CHAP algorithm \"%s\"\n",
+ iscsi, value );
+ return -EPROTO_INVALID_CHAP_ALGORITHM;
+ }
+
+ return 0;
+}
+
+/**
+ * Handle iSCSI CHAP_I text value
+ *
+ * @v iscsi iSCSI session
+ * @v value CHAP_I value
+ * @ret rc Return status code
+ */
+static int iscsi_handle_chap_i_value ( struct iscsi_session *iscsi,
+ const char *value ) {
+ unsigned int identifier;
+ char *endp;
+ int rc;
+
+ /* The CHAP identifier is an integer value */
+ identifier = strtoul ( value, &endp, 0 );
+ if ( *endp != '\0' ) {
+ DBGC ( iscsi, "iSCSI %p saw invalid CHAP identifier \"%s\"\n",
+ iscsi, value );
+ return -EPROTO_INVALID_CHAP_IDENTIFIER;
+ }
+
+ /* Prepare for CHAP with MD5 */
+ chap_finish ( &iscsi->chap );
+ if ( ( rc = chap_init ( &iscsi->chap, &md5_algorithm ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not initialise CHAP: %s\n",
+ iscsi, strerror ( rc ) );
+ return rc;
+ }
+
+ /* Identifier and secret are the first two components of the
+ * challenge.
+ */
+ chap_set_identifier ( &iscsi->chap, identifier );
+ if ( iscsi->initiator_password ) {
+ chap_update ( &iscsi->chap, iscsi->initiator_password,
+ strlen ( iscsi->initiator_password ) );
+ }
+
+ return 0;
+}
+
+/**
+ * Handle iSCSI CHAP_C text value
+ *
+ * @v iscsi iSCSI session
+ * @v value CHAP_C value
+ * @ret rc Return status code
+ */
+static int iscsi_handle_chap_c_value ( struct iscsi_session *iscsi,
+ const char *value ) {
+ uint8_t buf[ iscsi_large_binary_decoded_max_len ( value ) ];
+ unsigned int i;
+ size_t len;
+ int rc;
+
+ /* Process challenge */
+ rc = iscsi_large_binary_decode ( value, buf );
+ if ( rc < 0 ) {
+ DBGC ( iscsi, "iSCSI %p invalid CHAP challenge \"%s\": %s\n",
+ iscsi, value, strerror ( rc ) );
+ return rc;
+ }
+ len = rc;
+ chap_update ( &iscsi->chap, buf, len );
+
+ /* Build CHAP response */
+ DBGC ( iscsi, "iSCSI %p sending CHAP response\n", iscsi );
+ chap_respond ( &iscsi->chap );
+ iscsi->status |= ISCSI_STATUS_STRINGS_CHAP_RESPONSE;
+
+ /* Send CHAP challenge, if applicable */
+ if ( iscsi->target_username ) {
+ iscsi->status |= ISCSI_STATUS_STRINGS_CHAP_CHALLENGE;
+ /* Generate CHAP challenge data */
+ for ( i = 0 ; i < sizeof ( iscsi->chap_challenge ) ; i++ ) {
+ iscsi->chap_challenge[i] = random();
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Handle iSCSI CHAP_N text value
+ *
+ * @v iscsi iSCSI session
+ * @v value CHAP_N value
+ * @ret rc Return status code
+ */
+static int iscsi_handle_chap_n_value ( struct iscsi_session *iscsi,
+ const char *value ) {
+
+ /* The target username isn't actually involved at any point in
+ * the authentication process; it merely serves to identify
+ * which password the target is using to generate the CHAP
+ * response. We unnecessarily verify that the username is as
+ * expected, in order to provide mildly helpful diagnostics if
+ * the target is supplying the wrong username/password
+ * combination.
+ */
+ if ( iscsi->target_username &&
+ ( strcmp ( iscsi->target_username, value ) != 0 ) ) {
+ DBGC ( iscsi, "iSCSI %p target username \"%s\" incorrect "
+ "(wanted \"%s\")\n",
+ iscsi, value, iscsi->target_username );
+ return -EACCES_INCORRECT_TARGET_USERNAME;
+ }
+
+ return 0;
+}
+
+/**
+ * Handle iSCSI CHAP_R text value
+ *
+ * @v iscsi iSCSI session
+ * @v value CHAP_R value
+ * @ret rc Return status code
+ */
+static int iscsi_handle_chap_r_value ( struct iscsi_session *iscsi,
+ const char *value ) {
+ uint8_t buf[ iscsi_large_binary_decoded_max_len ( value ) ];
+ size_t len;
+ int rc;
+
+ /* Generate CHAP response for verification */
+ chap_finish ( &iscsi->chap );
+ if ( ( rc = chap_init ( &iscsi->chap, &md5_algorithm ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not initialise CHAP: %s\n",
+ iscsi, strerror ( rc ) );
+ return rc;
+ }
+ chap_set_identifier ( &iscsi->chap, iscsi->chap_challenge[0] );
+ if ( iscsi->target_password ) {
+ chap_update ( &iscsi->chap, iscsi->target_password,
+ strlen ( iscsi->target_password ) );
+ }
+ chap_update ( &iscsi->chap, &iscsi->chap_challenge[1],
+ ( sizeof ( iscsi->chap_challenge ) - 1 ) );
+ chap_respond ( &iscsi->chap );
+
+ /* Process response */
+ rc = iscsi_large_binary_decode ( value, buf );
+ if ( rc < 0 ) {
+ DBGC ( iscsi, "iSCSI %p invalid CHAP response \"%s\": %s\n",
+ iscsi, value, strerror ( rc ) );
+ return rc;
+ }
+ len = rc;
+
+ /* Check CHAP response */
+ if ( len != iscsi->chap.response_len ) {
+ DBGC ( iscsi, "iSCSI %p invalid CHAP response length\n",
+ iscsi );
+ return -EPROTO_INVALID_CHAP_RESPONSE;
+ }
+ if ( memcmp ( buf, iscsi->chap.response, len ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p incorrect CHAP response \"%s\"\n",
+ iscsi, value );
+ return -EACCES_INCORRECT_TARGET_PASSWORD;
+ }
+
+ /* Mark session as authenticated */
+ iscsi->status |= ISCSI_STATUS_AUTH_REVERSE_OK;
+
+ return 0;
+}
+
+/** An iSCSI text string that we want to handle */
+struct iscsi_string_type {
+ /** String key
+ *
+ * This is the portion preceding the "=" sign,
+ * e.g. "InitiatorName", "CHAP_A", etc.
+ */
+ const char *key;
+ /** Handle iSCSI string value
+ *
+ * @v iscsi iSCSI session
+ * @v value iSCSI string value
+ * @ret rc Return status code
+ */
+ int ( * handle ) ( struct iscsi_session *iscsi, const char *value );
+};
+
+/** iSCSI text strings that we want to handle */
+static struct iscsi_string_type iscsi_string_types[] = {
+ { "TargetAddress", iscsi_handle_targetaddress_value },
+ { "AuthMethod", iscsi_handle_authmethod_value },
+ { "CHAP_A", iscsi_handle_chap_a_value },
+ { "CHAP_I", iscsi_handle_chap_i_value },
+ { "CHAP_C", iscsi_handle_chap_c_value },
+ { "CHAP_N", iscsi_handle_chap_n_value },
+ { "CHAP_R", iscsi_handle_chap_r_value },
+ { NULL, NULL }
+};
+
+/**
+ * Handle iSCSI string
+ *
+ * @v iscsi iSCSI session
+ * @v string iSCSI string (in "key=value" format)
+ * @ret rc Return status code
+ */
+static int iscsi_handle_string ( struct iscsi_session *iscsi,
+ const char *string ) {
+ struct iscsi_string_type *type;
+ const char *separator;
+ const char *value;
+ size_t key_len;
+ int rc;
+
+ /* Find separator */
+ separator = strchr ( string, '=' );
+ if ( ! separator ) {
+ DBGC ( iscsi, "iSCSI %p malformed string %s\n",
+ iscsi, string );
+ return -EPROTO_INVALID_KEY_VALUE_PAIR;
+ }
+ key_len = ( separator - string );
+ value = ( separator + 1 );
+
+ /* Check for rejections. Since we send only non-rejectable
+ * values, any rejection is a fatal protocol error.
+ */
+ if ( strcmp ( value, "Reject" ) == 0 ) {
+ DBGC ( iscsi, "iSCSI %p rejection: %s\n", iscsi, string );
+ return -EPROTO_VALUE_REJECTED;
+ }
+
+ /* Handle key/value pair */
+ for ( type = iscsi_string_types ; type->key ; type++ ) {
+ if ( strncmp ( string, type->key, key_len ) != 0 )
+ continue;
+ DBGC ( iscsi, "iSCSI %p handling %s\n", iscsi, string );
+ if ( ( rc = type->handle ( iscsi, value ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not handle %s: %s\n",
+ iscsi, string, strerror ( rc ) );
+ return rc;
+ }
+ return 0;
+ }
+ DBGC ( iscsi, "iSCSI %p ignoring %s\n", iscsi, string );
+ return 0;
+}
+
+/**
+ * Handle iSCSI strings
+ *
+ * @v iscsi iSCSI session
+ * @v string iSCSI string buffer
+ * @v len Length of string buffer
+ * @ret rc Return status code
+ */
+static int iscsi_handle_strings ( struct iscsi_session *iscsi,
+ const char *strings, size_t len ) {
+ size_t string_len;
+ int rc;
+
+ /* Handle each string in turn, taking care not to overrun the
+ * data buffer in case of badly-terminated data.
+ */
+ while ( 1 ) {
+ string_len = ( strnlen ( strings, len ) + 1 );
+ if ( string_len > len )
+ break;
+ if ( ( rc = iscsi_handle_string ( iscsi, strings ) ) != 0 )
+ return rc;
+ strings += string_len;
+ len -= string_len;
+ }
+ return 0;
+}
+
+/**
+ * Convert iSCSI response status to return status code
+ *
+ * @v status_class iSCSI status class
+ * @v status_detail iSCSI status detail
+ * @ret rc Return status code
+ */
+static int iscsi_status_to_rc ( unsigned int status_class,
+ unsigned int status_detail ) {
+ switch ( status_class ) {
+ case ISCSI_STATUS_INITIATOR_ERROR :
+ switch ( status_detail ) {
+ case ISCSI_STATUS_INITIATOR_ERROR_AUTHENTICATION :
+ return -EPERM_INITIATOR_AUTHENTICATION;
+ case ISCSI_STATUS_INITIATOR_ERROR_AUTHORISATION :
+ return -EPERM_INITIATOR_AUTHORISATION;
+ case ISCSI_STATUS_INITIATOR_ERROR_NOT_FOUND :
+ case ISCSI_STATUS_INITIATOR_ERROR_REMOVED :
+ return -ENODEV;
+ default :
+ return -ENOTSUP_INITIATOR_STATUS;
+ }
+ case ISCSI_STATUS_TARGET_ERROR :
+ switch ( status_detail ) {
+ case ISCSI_STATUS_TARGET_ERROR_UNAVAILABLE:
+ return -EIO_TARGET_UNAVAILABLE;
+ case ISCSI_STATUS_TARGET_ERROR_NO_RESOURCES:
+ return -EIO_TARGET_NO_RESOURCES;
+ default:
+ return -ENOTSUP_TARGET_STATUS;
+ }
+ default :
+ return -EINVAL;
+ }
+}
+
+/**
+ * Receive data segment of an iSCSI login response PDU
+ *
+ * @v iscsi iSCSI session
+ * @v data Received data
+ * @v len Length of received data
+ * @v remaining Data remaining after this data
+ * @ret rc Return status code
+ */
+static int iscsi_rx_login_response ( struct iscsi_session *iscsi,
+ const void *data, size_t len,
+ size_t remaining ) {
+ struct iscsi_bhs_login_response *response
+ = &iscsi->rx_bhs.login_response;
+ int rc;
+
+ /* Buffer up the PDU data */
+ if ( ( rc = iscsi_rx_buffered_data ( iscsi, data, len ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not buffer login response: %s\n",
+ iscsi, strerror ( rc ) );
+ return rc;
+ }
+ if ( remaining )
+ return 0;
+
+ /* Process string data and discard string buffer */
+ if ( ( rc = iscsi_handle_strings ( iscsi, iscsi->rx_buffer,
+ iscsi->rx_len ) ) != 0 )
+ return rc;
+ iscsi_rx_buffered_data_done ( iscsi );
+
+ /* Check for login redirection */
+ if ( response->status_class == ISCSI_STATUS_REDIRECT ) {
+ DBGC ( iscsi, "iSCSI %p redirecting to new server\n", iscsi );
+ iscsi_close_connection ( iscsi, 0 );
+ if ( ( rc = iscsi_open_connection ( iscsi ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not redirect: %s\n ",
+ iscsi, strerror ( rc ) );
+ return rc;
+ }
+ return 0;
+ }
+
+ /* Check for fatal errors */
+ if ( response->status_class != 0 ) {
+ DBGC ( iscsi, "iSCSI login failure: class %02x detail %02x\n",
+ response->status_class, response->status_detail );
+ rc = iscsi_status_to_rc ( response->status_class,
+ response->status_detail );
+ return rc;
+ }
+
+ /* Handle login transitions */
+ if ( response->flags & ISCSI_LOGIN_FLAG_TRANSITION ) {
+ iscsi->status &= ~( ISCSI_STATUS_PHASE_MASK |
+ ISCSI_STATUS_STRINGS_MASK );
+ switch ( response->flags & ISCSI_LOGIN_NSG_MASK ) {
+ case ISCSI_LOGIN_NSG_OPERATIONAL_NEGOTIATION:
+ iscsi->status |=
+ ( ISCSI_STATUS_OPERATIONAL_NEGOTIATION_PHASE |
+ ISCSI_STATUS_STRINGS_OPERATIONAL );
+ break;
+ case ISCSI_LOGIN_NSG_FULL_FEATURE_PHASE:
+ iscsi->status |= ISCSI_STATUS_FULL_FEATURE_PHASE;
+ break;
+ default:
+ DBGC ( iscsi, "iSCSI %p got invalid response flags "
+ "%02x\n", iscsi, response->flags );
+ return -EIO;
+ }
+ }
+
+ /* Send next login request PDU if we haven't reached the full
+ * feature phase yet.
+ */
+ if ( ( iscsi->status & ISCSI_STATUS_PHASE_MASK ) !=
+ ISCSI_STATUS_FULL_FEATURE_PHASE ) {
+ iscsi_start_login ( iscsi );
+ return 0;
+ }
+
+ /* Check that target authentication was successful (if required) */
+ if ( ( iscsi->status & ISCSI_STATUS_AUTH_REVERSE_REQUIRED ) &&
+ ! ( iscsi->status & ISCSI_STATUS_AUTH_REVERSE_OK ) ) {
+ DBGC ( iscsi, "iSCSI %p nefarious target tried to bypass "
+ "authentication\n", iscsi );
+ return -EPROTO;
+ }
+
+ /* Notify SCSI layer of window change */
+ DBGC ( iscsi, "iSCSI %p entering full feature phase\n", iscsi );
+ xfer_window_changed ( &iscsi->control );
+
+ return 0;
+}
+
+/****************************************************************************
+ *
+ * iSCSI to socket interface
+ *
+ */
+
+/**
+ * Pause TX engine
+ *
+ * @v iscsi iSCSI session
+ */
+static void iscsi_tx_pause ( struct iscsi_session *iscsi ) {
+ process_del ( &iscsi->process );
+}
+
+/**
+ * Resume TX engine
+ *
+ * @v iscsi iSCSI session
+ */
+static void iscsi_tx_resume ( struct iscsi_session *iscsi ) {
+ process_add ( &iscsi->process );
+}
+
+/**
+ * Start up a new TX PDU
+ *
+ * @v iscsi iSCSI session
+ *
+ * This initiates the process of sending a new PDU. Only one PDU may
+ * be in transit at any one time.
+ */
+static void iscsi_start_tx ( struct iscsi_session *iscsi ) {
+
+ assert ( iscsi->tx_state == ISCSI_TX_IDLE );
+
+ /* Initialise TX BHS */
+ memset ( &iscsi->tx_bhs, 0, sizeof ( iscsi->tx_bhs ) );
+
+ /* Flag TX engine to start transmitting */
+ iscsi->tx_state = ISCSI_TX_BHS;
+
+ /* Start transmission process */
+ iscsi_tx_resume ( iscsi );
+}
+
+/**
+ * Transmit nothing
+ *
+ * @v iscsi iSCSI session
+ * @ret rc Return status code
+ */
+static int iscsi_tx_nothing ( struct iscsi_session *iscsi __unused ) {
+ return 0;
+}
+
+/**
+ * Transmit basic header segment of an iSCSI PDU
+ *
+ * @v iscsi iSCSI session
+ * @ret rc Return status code
+ */
+static int iscsi_tx_bhs ( struct iscsi_session *iscsi ) {
+ return xfer_deliver_raw ( &iscsi->socket, &iscsi->tx_bhs,
+ sizeof ( iscsi->tx_bhs ) );
+}
+
+/**
+ * Transmit data segment of an iSCSI PDU
+ *
+ * @v iscsi iSCSI session
+ * @ret rc Return status code
+ *
+ * Handle transmission of part of a PDU data segment. iscsi::tx_bhs
+ * will be valid when this is called.
+ */
+static int iscsi_tx_data ( struct iscsi_session *iscsi ) {
+ struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
+
+ switch ( common->opcode & ISCSI_OPCODE_MASK ) {
+ case ISCSI_OPCODE_DATA_OUT:
+ return iscsi_tx_data_out ( iscsi );
+ case ISCSI_OPCODE_LOGIN_REQUEST:
+ return iscsi_tx_login_request ( iscsi );
+ default:
+ /* Nothing to send in other states */
+ return 0;
+ }
+}
+
+/**
+ * Complete iSCSI PDU transmission
+ *
+ * @v iscsi iSCSI session
+ *
+ * Called when a PDU has been completely transmitted and the TX state
+ * machine is about to enter the idle state. iscsi::tx_bhs will be
+ * valid for the just-completed PDU when this is called.
+ */
+static void iscsi_tx_done ( struct iscsi_session *iscsi ) {
+ struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
+
+ /* Stop transmission process */
+ iscsi_tx_pause ( iscsi );
+
+ switch ( common->opcode & ISCSI_OPCODE_MASK ) {
+ case ISCSI_OPCODE_DATA_OUT:
+ iscsi_data_out_done ( iscsi );
+ case ISCSI_OPCODE_LOGIN_REQUEST:
+ iscsi_login_request_done ( iscsi );
+ default:
+ /* No action */
+ break;
+ }
+}
+
+/**
+ * Transmit iSCSI PDU
+ *
+ * @v iscsi iSCSI session
+ * @v buf Temporary data buffer
+ * @v len Length of temporary data buffer
+ *
+ * Constructs data to be sent for the current TX state
+ */
+static void iscsi_tx_step ( struct iscsi_session *iscsi ) {
+ struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
+ int ( * tx ) ( struct iscsi_session *iscsi );
+ enum iscsi_tx_state next_state;
+ size_t tx_len;
+ int rc;
+
+ /* Select fragment to transmit */
+ while ( 1 ) {
+ switch ( iscsi->tx_state ) {
+ case ISCSI_TX_BHS:
+ tx = iscsi_tx_bhs;
+ tx_len = sizeof ( iscsi->tx_bhs );
+ next_state = ISCSI_TX_AHS;
+ break;
+ case ISCSI_TX_AHS:
+ tx = iscsi_tx_nothing;
+ tx_len = 0;
+ next_state = ISCSI_TX_DATA;
+ break;
+ case ISCSI_TX_DATA:
+ tx = iscsi_tx_data;
+ tx_len = ISCSI_DATA_LEN ( common->lengths );
+ next_state = ISCSI_TX_IDLE;
+ break;
+ case ISCSI_TX_IDLE:
+ /* Nothing to do; pause processing */
+ iscsi_tx_pause ( iscsi );
+ return;
+ default:
+ assert ( 0 );
+ return;
+ }
+
+ /* Check for window availability, if needed */
+ if ( tx_len && ( xfer_window ( &iscsi->socket ) == 0 ) ) {
+ /* Cannot transmit at this point; pause
+ * processing and wait for window to reopen
+ */
+ iscsi_tx_pause ( iscsi );
+ return;
+ }
+
+ /* Transmit data */
+ if ( ( rc = tx ( iscsi ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not transmit: %s\n",
+ iscsi, strerror ( rc ) );
+ /* Transmission errors are fatal */
+ iscsi_close ( iscsi, rc );
+ return;
+ }
+
+ /* Move to next state */
+ iscsi->tx_state = next_state;
+
+ /* If we have moved to the idle state, mark
+ * transmission as complete
+ */
+ if ( iscsi->tx_state == ISCSI_TX_IDLE )
+ iscsi_tx_done ( iscsi );
+ }
+}
+
+/** iSCSI TX process descriptor */
+static struct process_descriptor iscsi_process_desc =
+ PROC_DESC ( struct iscsi_session, process, iscsi_tx_step );
+
+/**
+ * Receive basic header segment of an iSCSI PDU
+ *
+ * @v iscsi iSCSI session
+ * @v data Received data
+ * @v len Length of received data
+ * @v remaining Data remaining after this data
+ * @ret rc Return status code
+ *
+ * This fills in iscsi::rx_bhs with the data from the BHS portion of
+ * the received PDU.
+ */
+static int iscsi_rx_bhs ( struct iscsi_session *iscsi, const void *data,
+ size_t len, size_t remaining __unused ) {
+ memcpy ( &iscsi->rx_bhs.bytes[iscsi->rx_offset], data, len );
+ if ( ( iscsi->rx_offset + len ) >= sizeof ( iscsi->rx_bhs ) ) {
+ DBGC2 ( iscsi, "iSCSI %p received PDU opcode %#x len %#x\n",
+ iscsi, iscsi->rx_bhs.common.opcode,
+ ISCSI_DATA_LEN ( iscsi->rx_bhs.common.lengths ) );
+ }
+ return 0;
+}
+
+/**
+ * Discard portion of an iSCSI PDU.
+ *
+ * @v iscsi iSCSI session
+ * @v data Received data
+ * @v len Length of received data
+ * @v remaining Data remaining after this data
+ * @ret rc Return status code
+ *
+ * This discards data from a portion of a received PDU.
+ */
+static int iscsi_rx_discard ( struct iscsi_session *iscsi __unused,
+ const void *data __unused, size_t len __unused,
+ size_t remaining __unused ) {
+ /* Do nothing */
+ return 0;
+}
+
+/**
+ * Receive data segment of an iSCSI PDU
+ *
+ * @v iscsi iSCSI session
+ * @v data Received data
+ * @v len Length of received data
+ * @v remaining Data remaining after this data
+ * @ret rc Return status code
+ *
+ * Handle processing of part of a PDU data segment. iscsi::rx_bhs
+ * will be valid when this is called.
+ */
+static int iscsi_rx_data ( struct iscsi_session *iscsi, const void *data,
+ size_t len, size_t remaining ) {
+ struct iscsi_bhs_common_response *response
+ = &iscsi->rx_bhs.common_response;
+
+ /* Update cmdsn and statsn */
+ iscsi->cmdsn = ntohl ( response->expcmdsn );
+ iscsi->statsn = ntohl ( response->statsn );
+
+ switch ( response->opcode & ISCSI_OPCODE_MASK ) {
+ case ISCSI_OPCODE_LOGIN_RESPONSE:
+ return iscsi_rx_login_response ( iscsi, data, len, remaining );
+ case ISCSI_OPCODE_SCSI_RESPONSE:
+ return iscsi_rx_scsi_response ( iscsi, data, len, remaining );
+ case ISCSI_OPCODE_DATA_IN:
+ return iscsi_rx_data_in ( iscsi, data, len, remaining );
+ case ISCSI_OPCODE_R2T:
+ return iscsi_rx_r2t ( iscsi, data, len, remaining );
+ case ISCSI_OPCODE_NOP_IN:
+ return iscsi_rx_nop_in ( iscsi, data, len, remaining );
+ default:
+ if ( remaining )
+ return 0;
+ DBGC ( iscsi, "iSCSI %p unknown opcode %02x\n", iscsi,
+ response->opcode );
+ return -ENOTSUP_OPCODE;
+ }
+}
+
+/**
+ * Receive new data
+ *
+ * @v iscsi iSCSI session
+ * @v iobuf I/O buffer
+ * @v meta Data transfer metadata
+ * @ret rc Return status code
+ *
+ * This handles received PDUs. The receive strategy is to fill in
+ * iscsi::rx_bhs with the contents of the BHS portion of the PDU,
+ * throw away any AHS portion, and then process each part of the data
+ * portion as it arrives. The data processing routine therefore
+ * always has a full copy of the BHS available, even for portions of
+ * the data in different packets to the BHS.
+ */
+static int iscsi_socket_deliver ( struct iscsi_session *iscsi,
+ struct io_buffer *iobuf,
+ struct xfer_metadata *meta __unused ) {
+ struct iscsi_bhs_common *common = &iscsi->rx_bhs.common;
+ int ( * rx ) ( struct iscsi_session *iscsi, const void *data,
+ size_t len, size_t remaining );
+ enum iscsi_rx_state next_state;
+ size_t frag_len;
+ size_t remaining;
+ int rc;
+
+ while ( 1 ) {
+ switch ( iscsi->rx_state ) {
+ case ISCSI_RX_BHS:
+ rx = iscsi_rx_bhs;
+ iscsi->rx_len = sizeof ( iscsi->rx_bhs );
+ next_state = ISCSI_RX_AHS;
+ break;
+ case ISCSI_RX_AHS:
+ rx = iscsi_rx_discard;
+ iscsi->rx_len = 4 * ISCSI_AHS_LEN ( common->lengths );
+ next_state = ISCSI_RX_DATA;
+ break;
+ case ISCSI_RX_DATA:
+ rx = iscsi_rx_data;
+ iscsi->rx_len = ISCSI_DATA_LEN ( common->lengths );
+ next_state = ISCSI_RX_DATA_PADDING;
+ break;
+ case ISCSI_RX_DATA_PADDING:
+ rx = iscsi_rx_discard;
+ iscsi->rx_len = ISCSI_DATA_PAD_LEN ( common->lengths );
+ next_state = ISCSI_RX_BHS;
+ break;
+ default:
+ assert ( 0 );
+ rc = -EINVAL;
+ goto done;
+ }
+
+ frag_len = iscsi->rx_len - iscsi->rx_offset;
+ if ( frag_len > iob_len ( iobuf ) )
+ frag_len = iob_len ( iobuf );
+ remaining = iscsi->rx_len - iscsi->rx_offset - frag_len;
+ if ( ( rc = rx ( iscsi, iobuf->data, frag_len,
+ remaining ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not process received "
+ "data: %s\n", iscsi, strerror ( rc ) );
+ goto done;
+ }
+
+ iscsi->rx_offset += frag_len;
+ iob_pull ( iobuf, frag_len );
+
+ /* If all the data for this state has not yet been
+ * received, stay in this state for now.
+ */
+ if ( iscsi->rx_offset != iscsi->rx_len ) {
+ rc = 0;
+ goto done;
+ }
+
+ iscsi->rx_state = next_state;
+ iscsi->rx_offset = 0;
+ }
+
+ done:
+ /* Free I/O buffer */
+ free_iob ( iobuf );
+
+ /* Destroy session on error */
+ if ( rc != 0 )
+ iscsi_close ( iscsi, rc );
+
+ return rc;
+}
+
+/**
+ * Handle redirection event
+ *
+ * @v iscsi iSCSI session
+ * @v type Location type
+ * @v args Remaining arguments depend upon location type
+ * @ret rc Return status code
+ */
+static int iscsi_vredirect ( struct iscsi_session *iscsi, int type,
+ va_list args ) {
+ va_list tmp;
+ struct sockaddr *peer;
+
+ /* Intercept redirects to a LOCATION_SOCKET and record the IP
+ * address for the iBFT. This is a bit of a hack, but avoids
+ * inventing an ioctl()-style call to retrieve the socket
+ * address from a data-xfer interface.
+ */
+ if ( type == LOCATION_SOCKET ) {
+ va_copy ( tmp, args );
+ ( void ) va_arg ( tmp, int ); /* Discard "semantics" */
+ peer = va_arg ( tmp, struct sockaddr * );
+ memcpy ( &iscsi->target_sockaddr, peer,
+ sizeof ( iscsi->target_sockaddr ) );
+ va_end ( tmp );
+ }
+
+ return xfer_vreopen ( &iscsi->socket, type, args );
+}
+
+/** iSCSI socket interface operations */
+static struct interface_operation iscsi_socket_operations[] = {
+ INTF_OP ( xfer_deliver, struct iscsi_session *, iscsi_socket_deliver ),
+ INTF_OP ( xfer_window_changed, struct iscsi_session *,
+ iscsi_tx_resume ),
+ INTF_OP ( xfer_vredirect, struct iscsi_session *, iscsi_vredirect ),
+ INTF_OP ( intf_close, struct iscsi_session *, iscsi_close ),
+};
+
+/** iSCSI socket interface descriptor */
+static struct interface_descriptor iscsi_socket_desc =
+ INTF_DESC ( struct iscsi_session, socket, iscsi_socket_operations );
+
+/****************************************************************************
+ *
+ * iSCSI command issuing
+ *
+ */
+
+/**
+ * Check iSCSI flow-control window
+ *
+ * @v iscsi iSCSI session
+ * @ret len Length of window
+ */
+static size_t iscsi_scsi_window ( struct iscsi_session *iscsi ) {
+
+ if ( ( ( iscsi->status & ISCSI_STATUS_PHASE_MASK ) ==
+ ISCSI_STATUS_FULL_FEATURE_PHASE ) &&
+ ( iscsi->command == NULL ) ) {
+ /* We cannot handle concurrent commands */
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+/**
+ * Issue iSCSI SCSI command
+ *
+ * @v iscsi iSCSI session
+ * @v parent Parent interface
+ * @v command SCSI command
+ * @ret tag Command tag, or negative error
+ */
+static int iscsi_scsi_command ( struct iscsi_session *iscsi,
+ struct interface *parent,
+ struct scsi_cmd *command ) {
+
+ /* This iSCSI implementation cannot handle multiple concurrent
+ * commands or commands arriving before login is complete.
+ */
+ if ( iscsi_scsi_window ( iscsi ) == 0 ) {
+ DBGC ( iscsi, "iSCSI %p cannot handle concurrent commands\n",
+ iscsi );
+ return -EOPNOTSUPP;
+ }
+
+ /* Store command */
+ iscsi->command = malloc ( sizeof ( *command ) );
+ if ( ! iscsi->command )
+ return -ENOMEM;
+ memcpy ( iscsi->command, command, sizeof ( *command ) );
+
+ /* Assign new ITT */
+ iscsi_new_itt ( iscsi );
+
+ /* Start sending command */
+ iscsi_start_command ( iscsi );
+
+ /* Attach to parent interface and return */
+ intf_plug_plug ( &iscsi->data, parent );
+ return iscsi->itt;
+}
+
+/** iSCSI SCSI command-issuing interface operations */
+static struct interface_operation iscsi_control_op[] = {
+ INTF_OP ( scsi_command, struct iscsi_session *, iscsi_scsi_command ),
+ INTF_OP ( xfer_window, struct iscsi_session *, iscsi_scsi_window ),
+ INTF_OP ( intf_close, struct iscsi_session *, iscsi_close ),
+ INTF_OP ( acpi_describe, struct iscsi_session *, ibft_describe ),
+};
+
+/** iSCSI SCSI command-issuing interface descriptor */
+static struct interface_descriptor iscsi_control_desc =
+ INTF_DESC ( struct iscsi_session, control, iscsi_control_op );
+
+/**
+ * Close iSCSI command
+ *
+ * @v iscsi iSCSI session
+ * @v rc Reason for close
+ */
+static void iscsi_command_close ( struct iscsi_session *iscsi, int rc ) {
+
+ /* Restart interface */
+ intf_restart ( &iscsi->data, rc );
+
+ /* Treat unsolicited command closures mid-command as fatal,
+ * because we have no code to handle partially-completed PDUs.
+ */
+ if ( iscsi->command != NULL )
+ iscsi_close ( iscsi, ( ( rc == 0 ) ? -ECANCELED : rc ) );
+}
+
+/** iSCSI SCSI command interface operations */
+static struct interface_operation iscsi_data_op[] = {
+ INTF_OP ( intf_close, struct iscsi_session *, iscsi_command_close ),
+};
+
+/** iSCSI SCSI command interface descriptor */
+static struct interface_descriptor iscsi_data_desc =
+ INTF_DESC ( struct iscsi_session, data, iscsi_data_op );
+
+/****************************************************************************
+ *
+ * Instantiator
+ *
+ */
+
+/** iSCSI root path components (as per RFC4173) */
+enum iscsi_root_path_component {
+ RP_SERVERNAME = 0,
+ RP_PROTOCOL,
+ RP_PORT,
+ RP_LUN,
+ RP_TARGETNAME,
+ NUM_RP_COMPONENTS
+};
+
+/** iSCSI initiator IQN setting */
+const struct setting initiator_iqn_setting __setting ( SETTING_SANBOOT_EXTRA,
+ initiator-iqn ) = {
+ .name = "initiator-iqn",
+ .description = "iSCSI initiator name",
+ .tag = DHCP_ISCSI_INITIATOR_IQN,
+ .type = &setting_type_string,
+};
+
+/** iSCSI reverse username setting */
+const struct setting reverse_username_setting __setting ( SETTING_AUTH_EXTRA,
+ reverse-username ) = {
+ .name = "reverse-username",
+ .description = "Reverse user name",
+ .tag = DHCP_EB_REVERSE_USERNAME,
+ .type = &setting_type_string,
+};
+
+/** iSCSI reverse password setting */
+const struct setting reverse_password_setting __setting ( SETTING_AUTH_EXTRA,
+ reverse-password ) = {
+ .name = "reverse-password",
+ .description = "Reverse password",
+ .tag = DHCP_EB_REVERSE_PASSWORD,
+ .type = &setting_type_string,
+};
+
+/**
+ * Parse iSCSI root path
+ *
+ * @v iscsi iSCSI session
+ * @v root_path iSCSI root path (as per RFC4173)
+ * @ret rc Return status code
+ */
+static int iscsi_parse_root_path ( struct iscsi_session *iscsi,
+ const char *root_path ) {
+ char rp_copy[ strlen ( root_path ) + 1 ];
+ char *rp_comp[NUM_RP_COMPONENTS];
+ char *rp = rp_copy;
+ int i = 0;
+ int rc;
+
+ /* Split root path into component parts */
+ strcpy ( rp_copy, root_path );
+ while ( 1 ) {
+ rp_comp[i++] = rp;
+ if ( i == NUM_RP_COMPONENTS )
+ break;
+ for ( ; *rp != ':' ; rp++ ) {
+ if ( ! *rp ) {
+ DBGC ( iscsi, "iSCSI %p root path \"%s\" "
+ "too short\n", iscsi, root_path );
+ return -EINVAL_ROOT_PATH_TOO_SHORT;
+ }
+ }
+ *(rp++) = '\0';
+ }
+
+ /* Use root path components to configure iSCSI session */
+ iscsi->target_address = strdup ( rp_comp[RP_SERVERNAME] );
+ if ( ! iscsi->target_address )
+ return -ENOMEM;
+ iscsi->target_port = strtoul ( rp_comp[RP_PORT], NULL, 10 );
+ if ( ! iscsi->target_port )
+ iscsi->target_port = ISCSI_PORT;
+ if ( ( rc = scsi_parse_lun ( rp_comp[RP_LUN], &iscsi->lun ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p invalid LUN \"%s\"\n",
+ iscsi, rp_comp[RP_LUN] );
+ return rc;
+ }
+ iscsi->target_iqn = strdup ( rp_comp[RP_TARGETNAME] );
+ if ( ! iscsi->target_iqn )
+ return -ENOMEM;
+
+ return 0;
+}
+
+/**
+ * Fetch iSCSI settings
+ *
+ * @v iscsi iSCSI session
+ * @ret rc Return status code
+ */
+static int iscsi_fetch_settings ( struct iscsi_session *iscsi ) {
+ char *hostname;
+ union uuid uuid;
+ int len;
+
+ /* Fetch relevant settings. Don't worry about freeing on
+ * error, since iscsi_free() will take care of that anyway.
+ */
+ fetch_string_setting_copy ( NULL, &username_setting,
+ &iscsi->initiator_username );
+ fetch_string_setting_copy ( NULL, &password_setting,
+ &iscsi->initiator_password );
+ fetch_string_setting_copy ( NULL, &reverse_username_setting,
+ &iscsi->target_username );
+ fetch_string_setting_copy ( NULL, &reverse_password_setting,
+ &iscsi->target_password );
+
+ /* Use explicit initiator IQN if provided */
+ fetch_string_setting_copy ( NULL, &initiator_iqn_setting,
+ &iscsi->initiator_iqn );
+ if ( iscsi->initiator_iqn )
+ return 0;
+
+ /* Otherwise, try to construct an initiator IQN from the hostname */
+ fetch_string_setting_copy ( NULL, &hostname_setting, &hostname );
+ if ( hostname ) {
+ len = asprintf ( &iscsi->initiator_iqn,
+ ISCSI_DEFAULT_IQN_PREFIX ":%s", hostname );
+ free ( hostname );
+ if ( len < 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not allocate initiator "
+ "IQN\n", iscsi );
+ return -ENOMEM;
+ }
+ assert ( iscsi->initiator_iqn );
+ return 0;
+ }
+
+ /* Otherwise, try to construct an initiator IQN from the UUID */
+ if ( ( len = fetch_uuid_setting ( NULL, &uuid_setting, &uuid ) ) < 0 ) {
+ DBGC ( iscsi, "iSCSI %p has no suitable initiator IQN\n",
+ iscsi );
+ return -EINVAL_NO_INITIATOR_IQN;
+ }
+ if ( ( len = asprintf ( &iscsi->initiator_iqn,
+ ISCSI_DEFAULT_IQN_PREFIX ":%s",
+ uuid_ntoa ( &uuid ) ) ) < 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not allocate initiator IQN\n",
+ iscsi );
+ return -ENOMEM;
+ }
+ assert ( iscsi->initiator_iqn );
+
+ return 0;
+}
+
+
+/**
+ * Check iSCSI authentication details
+ *
+ * @v iscsi iSCSI session
+ * @ret rc Return status code
+ */
+static int iscsi_check_auth ( struct iscsi_session *iscsi ) {
+
+ /* Check for invalid authentication combinations */
+ if ( ( /* Initiator username without password (or vice-versa) */
+ ( !! iscsi->initiator_username ) ^
+ ( !! iscsi->initiator_password ) ) ||
+ ( /* Target username without password (or vice-versa) */
+ ( !! iscsi->target_username ) ^
+ ( !! iscsi->target_password ) ) ||
+ ( /* Target (reverse) without initiator (forward) */
+ ( iscsi->target_username &&
+ ( ! iscsi->initiator_username ) ) ) ) {
+ DBGC ( iscsi, "iSCSI %p invalid credentials: initiator "
+ "%sname,%spw, target %sname,%spw\n", iscsi,
+ ( iscsi->initiator_username ? "" : "no " ),
+ ( iscsi->initiator_password ? "" : "no " ),
+ ( iscsi->target_username ? "" : "no " ),
+ ( iscsi->target_password ? "" : "no " ) );
+ return -EINVAL_BAD_CREDENTIAL_MIX;
+ }
+
+ return 0;
+}
+
+/**
+ * Open iSCSI URI
+ *
+ * @v parent Parent interface
+ * @v uri URI
+ * @ret rc Return status code
+ */
+static int iscsi_open ( struct interface *parent, struct uri *uri ) {
+ struct iscsi_session *iscsi;
+ int rc;
+
+ /* Sanity check */
+ if ( ! uri->opaque ) {
+ rc = -EINVAL_NO_ROOT_PATH;
+ goto err_sanity_uri;
+ }
+
+ /* Allocate and initialise structure */
+ iscsi = zalloc ( sizeof ( *iscsi ) );
+ if ( ! iscsi ) {
+ rc = -ENOMEM;
+ goto err_zalloc;
+ }
+ ref_init ( &iscsi->refcnt, iscsi_free );
+ intf_init ( &iscsi->control, &iscsi_control_desc, &iscsi->refcnt );
+ intf_init ( &iscsi->data, &iscsi_data_desc, &iscsi->refcnt );
+ intf_init ( &iscsi->socket, &iscsi_socket_desc, &iscsi->refcnt );
+ process_init_stopped ( &iscsi->process, &iscsi_process_desc,
+ &iscsi->refcnt );
+
+ /* Parse root path */
+ if ( ( rc = iscsi_parse_root_path ( iscsi, uri->opaque ) ) != 0 )
+ goto err_parse_root_path;
+ /* Set fields not specified by root path */
+ if ( ( rc = iscsi_fetch_settings ( iscsi ) ) != 0 )
+ goto err_fetch_settings;
+ /* Validate authentication */
+ if ( ( rc = iscsi_check_auth ( iscsi ) ) != 0 )
+ goto err_check_auth;
+
+ /* Sanity checks */
+ if ( ! iscsi->target_address ) {
+ DBGC ( iscsi, "iSCSI %p does not yet support discovery\n",
+ iscsi );
+ rc = -ENOTSUP_DISCOVERY;
+ goto err_sanity_address;
+ }
+ if ( ! iscsi->target_iqn ) {
+ DBGC ( iscsi, "iSCSI %p no target address supplied in %s\n",
+ iscsi, uri->opaque );
+ rc = -EINVAL_NO_TARGET_IQN;
+ goto err_sanity_iqn;
+ }
+ DBGC ( iscsi, "iSCSI %p initiator %s\n",iscsi, iscsi->initiator_iqn );
+ DBGC ( iscsi, "iSCSI %p target %s %s\n",
+ iscsi, iscsi->target_address, iscsi->target_iqn );
+
+ /* Open socket */
+ if ( ( rc = iscsi_open_connection ( iscsi ) ) != 0 )
+ goto err_open_connection;
+
+ /* Attach SCSI device to parent interface */
+ if ( ( rc = scsi_open ( parent, &iscsi->control,
+ &iscsi->lun ) ) != 0 ) {
+ DBGC ( iscsi, "iSCSI %p could not create SCSI device: %s\n",
+ iscsi, strerror ( rc ) );
+ goto err_scsi_open;
+ }
+
+ /* Mortalise self, and return */
+ ref_put ( &iscsi->refcnt );
+ return 0;
+
+ err_scsi_open:
+ err_open_connection:
+ err_sanity_iqn:
+ err_sanity_address:
+ err_check_auth:
+ err_fetch_settings:
+ err_parse_root_path:
+ iscsi_close ( iscsi, rc );
+ ref_put ( &iscsi->refcnt );
+ err_zalloc:
+ err_sanity_uri:
+ return rc;
+}
+
+/** iSCSI URI opener */
+struct uri_opener iscsi_uri_opener __uri_opener = {
+ .scheme = "iscsi",
+ .open = iscsi_open,
+};
Code Review / kvmfornfv.git / blobdiff