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gnuk/src/usb-icc.c
NIIBE Yutaka 2fbdeb8d89 Revert change of usb-icc.c
2011-05-11 16:46:21 +09:00

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/*
* usb-icc.c -- USB CCID/ICCD protocol handling
*
* Copyright (C) 2010, 2011 Free Software Initiative of Japan
* Author: NIIBE Yutaka <gniibe@fsij.org>
*
* This file is a part of Gnuk, a GnuPG USB Token implementation.
*
* Gnuk 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.
*
* Gnuk 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 "config.h"
#include "ch.h"
#include "hal.h"
#include "gnuk.h"
#include "usb_lib.h"
#include "usb_desc.h"
#include "usb_mem.h"
#include "hw_config.h"
#include "usb_istr.h"
#define ICC_SET_PARAMS 0x61 /* non-ICCD command */
#define ICC_POWER_ON 0x62
#define ICC_POWER_OFF 0x63
#define ICC_SLOT_STATUS 0x65 /* non-ICCD command */
#define ICC_SECURE 0x69 /* non-ICCD command */
#define ICC_GET_PARAMS 0x6C /* non-ICCD command */
#define ICC_XFR_BLOCK 0x6F
#define ICC_DATA_BLOCK_RET 0x80
#define ICC_SLOT_STATUS_RET 0x81 /* non-ICCD result */
#define ICC_PARAMS_RET 0x82 /* non-ICCD result */
#define ICC_MSG_SEQ_OFFSET 6
#define ICC_MSG_STATUS_OFFSET 7
#define ICC_MSG_ERROR_OFFSET 8
#define ICC_MSG_CHAIN_OFFSET 9
#define ICC_MSG_DATA_OFFSET 10 /* == ICC_MSG_HEADER_SIZE */
#define ICC_MAX_MSG_DATA_SIZE (USB_BUF_SIZE - ICC_MSG_HEADER_SIZE)
#define ICC_STATUS_RUN 0x00
#define ICC_STATUS_PRESENT 0x01
#define ICC_STATUS_NOTPRESENT 0x02
#define ICC_CMD_STATUS_OK 0x00
#define ICC_CMD_STATUS_ERROR 0x40
#define ICC_CMD_STATUS_TIMEEXT 0x80
#define ICC_ERROR_XFR_OVERRUN 0xFC
/*
* Since command-byte is at offset 0,
* error with offset 0 means "command not supported".
*/
#define ICC_OFFSET_CMD_NOT_SUPPORTED 0
#define ICC_OFFSET_PARAM 8
struct icc_header {
uint8_t msg_type;
int32_t data_len;
uint8_t slot;
uint8_t seq;
uint8_t rsvd;
uint16_t param;
} __attribute__((packed));
int icc_data_size;
/*
* USB-ICC communication could be considered "half duplex".
*
* While the device is sending something, there is no possibility for
* the device to receive anything.
*
* While the device is receiving something, there is no possibility
* for the device to send anything.
*
* Thus, the buffer can be shared for RX and TX.
*/
/*
* Buffer of USB communication: for both of RX and TX
*
* The buffer will be filled by multiple RX transactions (Bulk-OUT)
* or will be used for multiple TX transactions (Bulk-IN)
*/
uint8_t icc_buffer[USB_BUF_SIZE];
uint8_t icc_seq;
/*
* Pointer to ICC_BUFFER
*/
static uint8_t *icc_next_p;
/*
* Chain pointer: This implementation support two packets in chain (not more)
*/
static uint8_t *icc_chain_p;
/*
* Whole size of TX transfer (Bulk-IN transactions)
*/
static int icc_tx_size;
static Thread *icc_thread;
#define EV_RX_DATA_READY (eventmask_t)1 /* USB Rx data available */
/* EV_EXEC_FINISHED == 2 */
#define EV_TX_FINISHED (eventmask_t)4 /* USB Tx finished */
/*
* Tx done callback
*/
void
EP1_IN_Callback (void)
{
if (icc_next_p == NULL)
/* The sequence of Bulk-IN transactions finished */
chEvtSignalI (icc_thread, EV_TX_FINISHED);
else if (icc_next_p == &icc_buffer[icc_tx_size])
/* It was multiple of USB_LL_BUF_SIZE */
{
/* Send the last 0-DATA transcation of Bulk-IN in the transactions */
icc_next_p = NULL;
USB_SIL_Write (EP1_IN, icc_buffer, 0);
SetEPTxValid (ENDP1);
}
else
{
int tx_size = USB_LL_BUF_SIZE;
uint8_t *p = icc_next_p;
icc_next_p += USB_LL_BUF_SIZE;
if (icc_next_p > &icc_buffer[icc_tx_size])
{
icc_next_p = NULL;
tx_size = &icc_buffer[icc_tx_size] - p;
}
USB_SIL_Write (EP1_IN, p, tx_size);
SetEPTxValid (ENDP1);
}
}
static void
icc_prepare_receive (int chain)
{
if (chain)
icc_next_p = icc_chain_p;
else
icc_next_p = icc_buffer;
SetEPRxValid (ENDP2);
}
/*
* Rx ready callback
*/
void
EP2_OUT_Callback (void)
{
int len;
len = USB_SIL_Read (EP2_OUT, icc_next_p);
if (len == USB_LL_BUF_SIZE) /* The sequence of transactions continues */
{
icc_next_p += USB_LL_BUF_SIZE;
SetEPRxValid (ENDP2);
if ((icc_next_p - icc_buffer) >= USB_BUF_SIZE)
/* No room to receive any more */
{
DEBUG_INFO ("ERR0F\r\n");
icc_next_p -= USB_LL_BUF_SIZE; /* Just for not overrun the buffer */
/*
* Receive until the end of the sequence
* (and discard the whole block)
*/
}
}
else /* Finished */
{
struct icc_header *icc_header;
int data_len;
icc_next_p += len;
if (icc_chain_p)
{
icc_header = (struct icc_header *)icc_chain_p;
icc_data_size = (icc_next_p - icc_chain_p) - ICC_MSG_HEADER_SIZE;
}
else
{
icc_header = (struct icc_header *)icc_buffer;
icc_data_size = (icc_next_p - icc_buffer) - ICC_MSG_HEADER_SIZE;
}
/* NOTE: We're little endian, nothing to convert */
data_len = icc_header->data_len;
icc_seq = icc_header->seq;
if (icc_data_size != data_len)
{
DEBUG_INFO ("ERR0E\r\n");
/* Ignore the whole block */
icc_chain_p = NULL;
icc_prepare_receive (0);
}
else
/* Notify myself */
chEvtSignalI (icc_thread, EV_RX_DATA_READY);
}
}
volatile enum icc_state icc_state;
/*
* ATR (Answer To Reset) string
*
* TS = 0x3b: Direct conversion
* T0 = 0xda: TA1, TC1 and TD1 follow, 10 historical bytes
* TA1 = 0x11: FI=1, DI=1
* TC1 = 0xff
* TD1 = 0x81: TD2 follows, T=1
* TD2 = 0xb1: TA3, TB3 and TD3 follow, T=1
* TA3 = 0xFE: IFSC = 254 bytes
* TB3 = 0x55: BWI = 5, CWI = 5 (BWT timeout 3.2 sec)
* TD3 = 0x1f: TA4 follows, T=15
* TA4 = 0x03: 5V or 3.3V
* Historical bytes: to be explained...
* XOR check
*
* Minimum: 0x3b, 0x8a, 0x80, 0x01, + historical bytes, xor check
*
*/
static const char ATR[] = {
0x3b, 0xda, 0x11, 0xff, 0x81, 0xb1, 0xfe, 0x55, 0x1f, 0x03,
0x00,
0x31, 0x84, /* full DF name, GET DATA, MF */
0x73,
0x80, /* DF full name */
0x01, /* 1-byte */
0x40, /* Extended Lc and extended Le */
0x00,
0x90, 0x00,
(0xda^0x11^0xff^0x81^0xb1^0xfe^0x55^0x1f^0x03
^0x00^0x31^0x84^0x73^0x80^0x01^0x40^0x00^0x90^0x00)
};
/*
* Send back error
*/
void
icc_error (int offset)
{
uint8_t *icc_reply;
if (icc_chain_p)
icc_reply = icc_chain_p;
else
icc_reply = icc_buffer;
icc_reply[0] = ICC_SLOT_STATUS_RET; /* Any value should be OK */
icc_reply[1] = 0x00;
icc_reply[2] = 0x00;
icc_reply[3] = 0x00;
icc_reply[4] = 0x00;
icc_reply[5] = 0x00; /* Slot */
icc_reply[ICC_MSG_SEQ_OFFSET] = icc_seq;
if (icc_state == ICC_STATE_START)
/* 1: ICC present but not activated 2: No ICC present */
icc_reply[ICC_MSG_STATUS_OFFSET] = 1;
else
/* An ICC is present and active */
icc_reply[ICC_MSG_STATUS_OFFSET] = 0;
icc_reply[ICC_MSG_STATUS_OFFSET] |= ICC_CMD_STATUS_ERROR; /* Failed */
icc_reply[ICC_MSG_ERROR_OFFSET] = offset;
icc_reply[ICC_MSG_CHAIN_OFFSET] = 0x00;
icc_next_p = NULL; /* This is a single transaction Bulk-IN */
icc_tx_size = ICC_MSG_HEADER_SIZE;
USB_SIL_Write (EP1_IN, icc_reply, icc_tx_size);
SetEPTxValid (ENDP1);
}
static Thread *gpg_thread;
static WORKING_AREA(waGPGthread, 128*16);
extern msg_t GPGthread (void *arg);
/* Send back ATR (Answer To Reset) */
enum icc_state
icc_power_on (void)
{
int size_atr;
if (gpg_thread == NULL)
gpg_thread = chThdCreateStatic (waGPGthread, sizeof(waGPGthread),
NORMALPRIO, GPGthread, (void *)icc_thread);
size_atr = sizeof (ATR);
icc_buffer[0] = ICC_DATA_BLOCK_RET;
icc_buffer[1] = size_atr;
icc_buffer[2] = 0x00;
icc_buffer[3] = 0x00;
icc_buffer[4] = 0x00;
icc_buffer[5] = 0x00; /* Slot */
icc_buffer[ICC_MSG_SEQ_OFFSET] = icc_seq;
icc_buffer[ICC_MSG_STATUS_OFFSET] = 0x00;
icc_buffer[ICC_MSG_ERROR_OFFSET] = 0x00;
icc_buffer[ICC_MSG_CHAIN_OFFSET] = 0x00;
memcpy (&icc_buffer[ICC_MSG_DATA_OFFSET], ATR, size_atr);
icc_next_p = NULL; /* This is a single transaction Bulk-IN */
icc_tx_size = ICC_MSG_HEADER_SIZE + size_atr;
USB_SIL_Write (EP1_IN, icc_buffer, icc_tx_size);
SetEPTxValid (ENDP1);
DEBUG_INFO ("ON\r\n");
return ICC_STATE_WAIT;
}
static void
icc_send_status (void)
{
uint8_t *icc_reply;
if (icc_chain_p)
icc_reply = icc_chain_p;
else
icc_reply = icc_buffer;
icc_reply[0] = ICC_SLOT_STATUS_RET;
icc_reply[1] = 0x00;
icc_reply[2] = 0x00;
icc_reply[3] = 0x00;
icc_reply[4] = 0x00;
icc_reply[5] = 0x00; /* Slot */
icc_reply[ICC_MSG_SEQ_OFFSET] = icc_seq;
if (icc_state == ICC_STATE_START)
/* 1: ICC present but not activated 2: No ICC present */
icc_reply[ICC_MSG_STATUS_OFFSET] = 1;
else
/* An ICC is present and active */
icc_reply[ICC_MSG_STATUS_OFFSET] = 0;
icc_reply[ICC_MSG_ERROR_OFFSET] = 0x00;
icc_reply[ICC_MSG_CHAIN_OFFSET] = 0x00;
icc_next_p = NULL; /* This is a single transaction Bulk-IN */
icc_tx_size = ICC_MSG_HEADER_SIZE;
USB_SIL_Write (EP1_IN, icc_reply, icc_tx_size);
SetEPTxValid (ENDP1);
#ifdef DEBUG_MORE
DEBUG_INFO ("St\r\n");
#endif
}
enum icc_state
icc_power_off (void)
{
icc_data_size = 0;
if (gpg_thread)
{
chThdTerminate (gpg_thread);
chEvtSignal (gpg_thread, (eventmask_t)1);
chThdWait (gpg_thread);
gpg_thread = NULL;
}
icc_state = ICC_STATE_START; /* This status change should be here */
icc_send_status ();
DEBUG_INFO ("OFF\r\n");
return ICC_STATE_START;
}
int res_APDU_size;
const uint8_t *res_APDU_pointer;
static void
icc_send_data_block (int len, uint8_t status, uint8_t chain)
{
int tx_size = USB_LL_BUF_SIZE;
uint8_t *p;
if (icc_chain_p)
p = icc_chain_p;
else
p = icc_buffer;
p[0] = ICC_DATA_BLOCK_RET;
p[1] = len & 0xFF;
p[2] = (len >> 8)& 0xFF;
p[3] = (len >> 16)& 0xFF;
p[4] = (len >> 24)& 0xFF;
p[5] = 0x00; /* Slot */
p[ICC_MSG_SEQ_OFFSET] = icc_seq;
p[ICC_MSG_STATUS_OFFSET] = status;
p[ICC_MSG_ERROR_OFFSET] = 0;
p[ICC_MSG_CHAIN_OFFSET] = chain;
icc_tx_size = ICC_MSG_HEADER_SIZE + len;
if (icc_tx_size < USB_LL_BUF_SIZE)
{
icc_next_p = NULL;
tx_size = icc_tx_size;
}
else
icc_next_p = p + USB_LL_BUF_SIZE;
USB_SIL_Write (EP1_IN, p, tx_size);
SetEPTxValid (ENDP1);
#ifdef DEBUG_MORE
DEBUG_INFO ("DATA\r\n");
#endif
}
static void
icc_send_params (void)
{
icc_buffer[0] = ICC_PARAMS_RET;
icc_buffer[1] = 0x07; /* Length = 0x00000007 */
icc_buffer[2] = 0;
icc_buffer[3] = 0;
icc_buffer[4] = 0;
icc_buffer[5] = 0x00; /* Slot */
icc_buffer[ICC_MSG_SEQ_OFFSET] = icc_seq;
icc_buffer[ICC_MSG_STATUS_OFFSET] = 0;
icc_buffer[ICC_MSG_ERROR_OFFSET] = 0;
icc_buffer[ICC_MSG_CHAIN_OFFSET] = 0x01; /* ProtocolNum: T=1 */
icc_buffer[ICC_MSG_DATA_OFFSET] = 0x11; /* bmFindexDindex */
icc_buffer[ICC_MSG_DATA_OFFSET+1] = 0x11; /* bmTCCKST1 */
icc_buffer[ICC_MSG_DATA_OFFSET+2] = 0xFE; /* bGuardTimeT1 */
icc_buffer[ICC_MSG_DATA_OFFSET+3] = 0x55; /* bmWaitingIntegersT1 */
icc_buffer[ICC_MSG_DATA_OFFSET+4] = 0x03; /* bClockStop */
icc_buffer[ICC_MSG_DATA_OFFSET+5] = 0xFE; /* bIFSC */
icc_buffer[ICC_MSG_DATA_OFFSET+6] = 0; /* bNadValue */
icc_next_p = NULL; /* This is a single transaction Bulk-IN */
icc_tx_size = ICC_MSG_HEADER_SIZE + 7;
USB_SIL_Write (EP1_IN, icc_buffer, icc_tx_size);
SetEPTxValid (ENDP1);
#ifdef DEBUG_MORE
DEBUG_INFO ("DATA\r\n");
#endif
}
/* Supporting smaller buffer of libccid (<= 1.3.11) */
#define ICC_RESPONSE_MSG_DATA_SIZE 262
static enum icc_state
icc_handle_data (void)
{
enum icc_state next_state = icc_state;
struct icc_header *icc_header;
if (icc_chain_p)
icc_header = (struct icc_header *)icc_chain_p;
else
icc_header = (struct icc_header *)icc_buffer;
switch (icc_state)
{
case ICC_STATE_START:
if (icc_header->msg_type == ICC_POWER_ON)
next_state = icc_power_on ();
else if (icc_header->msg_type == ICC_POWER_OFF)
next_state = icc_power_off ();
else if (icc_header->msg_type == ICC_SLOT_STATUS)
icc_send_status ();
else
{
DEBUG_INFO ("ERR01\r\n");
icc_error (ICC_OFFSET_CMD_NOT_SUPPORTED);
}
break;
case ICC_STATE_WAIT:
if (icc_header->msg_type == ICC_POWER_ON)
/* Not in the spec., but pcscd/libccid */
next_state = icc_power_on ();
else if (icc_header->msg_type == ICC_POWER_OFF)
next_state = icc_power_off ();
else if (icc_header->msg_type == ICC_SLOT_STATUS)
icc_send_status ();
else if (icc_header->msg_type == ICC_XFR_BLOCK)
{
if (icc_header->param == 0)
{ /* Give this message to GPG thread */
chEvtSignal (gpg_thread, (eventmask_t)1);
next_state = ICC_STATE_EXECUTE;
}
else if (icc_header->param == 1)
{
icc_chain_p = icc_next_p;
icc_send_data_block (0, 0, 0x10);
next_state = ICC_STATE_RECEIVE;
}
else
{
DEBUG_INFO ("ERR02\r\n");
icc_error (ICC_OFFSET_PARAM);
}
}
else if (icc_header->msg_type == ICC_SET_PARAMS
|| icc_header->msg_type == ICC_GET_PARAMS)
icc_send_params ();
else if (icc_header->msg_type == ICC_SECURE)
{
if (icc_buffer[10] == 0x00) /* PIN verification */
{
cmd_APDU[0] = icc_buffer[25];
cmd_APDU[1] = icc_buffer[26];
cmd_APDU[2] = icc_buffer[27];
cmd_APDU[3] = icc_buffer[28];
icc_data_size = 4;
chEvtSignal (gpg_thread, (eventmask_t)1);
next_state = ICC_STATE_EXECUTE;
}
else if (icc_buffer[10] == 0x01) /* PIN Modification */
{
uint8_t num_msgs = icc_buffer[21];
if (num_msgs == 0x00)
num_msgs = 1;
else if (num_msgs == 0xff)
num_msgs = 3;
cmd_APDU[0] = icc_buffer[27 + num_msgs];
cmd_APDU[1] = icc_buffer[28 + num_msgs];
cmd_APDU[2] = icc_buffer[29 + num_msgs];
cmd_APDU[3] = icc_buffer[30 + num_msgs];
icc_data_size = 4;
chEvtSignal (gpg_thread, (eventmask_t)1);
next_state = ICC_STATE_EXECUTE;
}
else
icc_error (ICC_MSG_DATA_OFFSET);
}
else
{
DEBUG_INFO ("ERR03\r\n");
DEBUG_BYTE (icc_header->msg_type);
icc_error (ICC_OFFSET_CMD_NOT_SUPPORTED);
}
break;
case ICC_STATE_RECEIVE:
if (icc_header->msg_type == ICC_POWER_OFF)
{
icc_chain_p = NULL;
next_state = icc_power_off ();
}
else if (icc_header->msg_type == ICC_SLOT_STATUS)
icc_send_status ();
else if (icc_header->msg_type == ICC_XFR_BLOCK)
{
if (icc_header->param == 2) /* Got the final block */
{ /* Give this message to GPG thread */
int len = icc_next_p - icc_chain_p - ICC_MSG_HEADER_SIZE;
memmove (icc_chain_p, icc_chain_p + ICC_MSG_HEADER_SIZE, len);
icc_next_p -= ICC_MSG_HEADER_SIZE;
icc_data_size = icc_next_p - icc_buffer - ICC_MSG_HEADER_SIZE;
icc_chain_p = NULL;
next_state = ICC_STATE_EXECUTE;
chEvtSignal (gpg_thread, (eventmask_t)1);
}
else /* icc_header->param == 3 is not supported. */
{
DEBUG_INFO ("ERR08\r\n");
icc_error (ICC_OFFSET_PARAM);
}
}
else
{
DEBUG_INFO ("ERR05\r\n");
DEBUG_BYTE (icc_header->msg_type);
icc_chain_p = NULL;
icc_error (ICC_OFFSET_CMD_NOT_SUPPORTED);
next_state = ICC_STATE_WAIT;
}
break;
case ICC_STATE_EXECUTE:
if (icc_header->msg_type == ICC_POWER_OFF)
next_state = icc_power_off ();
else if (icc_header->msg_type == ICC_SLOT_STATUS)
icc_send_status ();
else
{
DEBUG_INFO ("ERR04\r\n");
DEBUG_BYTE (icc_header->msg_type);
icc_error (ICC_OFFSET_CMD_NOT_SUPPORTED);
}
break;
case ICC_STATE_SEND:
if (icc_header->msg_type == ICC_POWER_OFF)
next_state = icc_power_off ();
else if (icc_header->msg_type == ICC_SLOT_STATUS)
icc_send_status ();
else if (icc_header->msg_type == ICC_XFR_BLOCK)
{
if (icc_header->param == 0x10)
{
if (res_APDU_pointer != NULL)
{
memcpy (res_APDU, res_APDU_pointer,
ICC_RESPONSE_MSG_DATA_SIZE);
res_APDU_pointer += ICC_RESPONSE_MSG_DATA_SIZE;
}
else
memmove (res_APDU, res_APDU+ICC_RESPONSE_MSG_DATA_SIZE,
res_APDU_size);
if (res_APDU_size <= ICC_RESPONSE_MSG_DATA_SIZE)
{
icc_send_data_block (res_APDU_size, 0, 0x02);
next_state = ICC_STATE_WAIT;
}
else
{
icc_send_data_block (ICC_RESPONSE_MSG_DATA_SIZE, 0, 0x03);
res_APDU_size -= ICC_RESPONSE_MSG_DATA_SIZE;
}
}
else
{
DEBUG_INFO ("ERR0A\r\n");
DEBUG_BYTE (icc_header->param >> 8);
DEBUG_BYTE (icc_header->param & 0xff);
icc_error (ICC_OFFSET_PARAM);
next_state = ICC_STATE_WAIT;
}
}
else
{
DEBUG_INFO ("ERR06\r\n");
DEBUG_BYTE (icc_header->msg_type);
icc_error (ICC_OFFSET_CMD_NOT_SUPPORTED);
next_state = ICC_STATE_WAIT;
}
break;
default:
next_state = ICC_STATE_START;
DEBUG_INFO ("ERR10\r\n");
break;
}
return next_state;
}
static enum icc_state
icc_handle_timeout (void)
{
enum icc_state next_state = icc_state;
switch (icc_state)
{
case ICC_STATE_EXECUTE:
icc_send_data_block (0, ICC_CMD_STATUS_TIMEEXT, 0);
break;
default:
break;
}
return next_state;
}
#define USB_ICC_TIMEOUT MS2ST(1950)
msg_t
USBthread (void *arg)
{
(void)arg;
icc_thread = chThdSelf ();
chEvtClear (ALL_EVENTS);
icc_state = ICC_STATE_START;
icc_prepare_receive (0);
while (1)
{
eventmask_t m;
m = chEvtWaitOneTimeout (ALL_EVENTS, USB_ICC_TIMEOUT);
if (m == EV_RX_DATA_READY)
icc_state = icc_handle_data ();
else if (m == EV_EXEC_FINISHED)
if (icc_state == ICC_STATE_EXECUTE)
{
if (res_APDU_pointer != NULL)
{
memcpy (res_APDU, res_APDU_pointer, ICC_RESPONSE_MSG_DATA_SIZE);
res_APDU_pointer += ICC_RESPONSE_MSG_DATA_SIZE;
}
if (res_APDU_size <= ICC_RESPONSE_MSG_DATA_SIZE)
{
icc_send_data_block (res_APDU_size, 0, 0);
icc_state = ICC_STATE_WAIT;
}
else
{
icc_send_data_block (ICC_RESPONSE_MSG_DATA_SIZE, 0, 0x01);
res_APDU_size -= ICC_RESPONSE_MSG_DATA_SIZE;
icc_state = ICC_STATE_SEND;
}
}
else
{ /* XXX: error */
DEBUG_INFO ("ERR07\r\n");
}
else if (m == EV_TX_FINISHED)
{
if (icc_state == ICC_STATE_START || icc_state == ICC_STATE_WAIT
|| icc_state == ICC_STATE_SEND)
icc_prepare_receive (0);
else if (icc_state == ICC_STATE_RECEIVE)
icc_prepare_receive (1);
}
else /* Timeout */
icc_state = icc_handle_timeout ();
}
return 0;
}
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