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librfid/src/rfid_layer2_iso14443a.c

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/* ISO 14443-3 A anticollision implementation
*
* (C) 2005-2006 by Harald Welte <laforge@gnumonks.org>
*
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <librfid/rfid.h>
#include <librfid/rfid_layer2.h>
#include <librfid/rfid_reader.h>
#include <librfid/rfid_layer2_iso14443a.h>
#include <librfid/rfid_protocol.h>
#define TIMEOUT 1236
/* Transceive a 7-bit short frame */
static int
iso14443a_transceive_sf(struct rfid_layer2_handle *handle,
unsigned char cmd,
struct iso14443a_atqa *atqa)
{
struct rfid_reader *rdr = handle->rh->reader;
return rdr->iso14443a.transceive_sf(handle->rh, cmd, atqa);
}
/* Transmit an anticollission bit frame */
static int
iso14443a_transceive_acf(struct rfid_layer2_handle *handle,
struct iso14443a_anticol_cmd *acf,
unsigned int *bit_of_col)
{
struct rfid_reader *rdr = handle->rh->reader;
return rdr->iso14443a.transceive_acf(handle->rh, acf, bit_of_col);
}
/* Transmit a regular frame */
static int
iso14443a_transceive(struct rfid_layer2_handle *handle,
enum rfid_frametype frametype,
const unsigned char *tx_buf, unsigned int tx_len,
unsigned char *rx_buf, unsigned int *rx_len,
u_int64_t timeout, unsigned int flags)
{
return handle->rh->reader->transceive(handle->rh, frametype, tx_buf,
tx_len, rx_buf, rx_len, timeout, flags);
}
static int
iso14443a_code_nvb_bits(unsigned char *nvb, unsigned int bits)
{
unsigned int byte_count = bits / 8;
unsigned int bit_count = bits % 8;
if (byte_count < 2 || byte_count > 7)
return -1;
*nvb = ((byte_count & 0xf) << 4) | bit_count;
return 0;
}
/* first bit is '1', second bit '2' */
static void
set_bit_in_field(unsigned char *bitfield, unsigned int bit)
{
unsigned int byte_count = bit / 8;
unsigned int bit_count = bit % 8;
DEBUGP("bitfield=%p, byte_count=%u, bit_count=%u\n",
bitfield, byte_count, bit_count);
DEBUGP("%p = 0x%02x\n", (bitfield+byte_count), *(bitfield+byte_count));
*(bitfield+byte_count) |= 1 << (bit_count-1);
DEBUGP("%p = 0x%02x\n", (bitfield+byte_count), *(bitfield+byte_count));
}
static int
iso14443a_anticol(struct rfid_layer2_handle *handle)
{
int ret;
unsigned int uid_size;
struct iso14443a_handle *h = &handle->priv.iso14443a;
struct iso14443a_atqa atqa;
struct iso14443a_anticol_cmd acf;
unsigned int bit_of_col;
unsigned char sak[3];
unsigned int rx_len = sizeof(sak);
char *aqptr = (char *) &atqa;
memset(handle->uid, 0, sizeof(handle->uid));
memset(sak, 0, sizeof(sak));
memset(&atqa, 0, sizeof(atqa));
memset(&acf, 0, sizeof(acf));
if (handle->flags & RFID_OPT_LAYER2_WUP)
ret = iso14443a_transceive_sf(handle, ISO14443A_SF_CMD_WUPA, &atqa);
else
ret = iso14443a_transceive_sf(handle, ISO14443A_SF_CMD_REQA, &atqa);
if (ret < 0) {
h->state = ISO14443A_STATE_REQA_SENT;
DEBUGP("error during transceive_sf: %d\n", ret);
return ret;
}
h->state = ISO14443A_STATE_ATQA_RCVD;
DEBUGP("ATQA: 0x%02x 0x%02x\n", *aqptr, *(aqptr+1));
if (!atqa.bf_anticol) {
h->state = ISO14443A_STATE_NO_BITFRAME_ANTICOL;
DEBUGP("no bitframe anticollission bits set, aborting\n");
return -1;
}
if (atqa.uid_size == 2 || atqa.uid_size == 3)
uid_size = 3;
else if (atqa.uid_size == 1)
uid_size = 2;
else
uid_size = 1;
acf.sel_code = ISO14443A_AC_SEL_CODE_CL1;
h->state = ISO14443A_STATE_ANTICOL_RUNNING;
h->level = ISO14443A_LEVEL_CL1;
cascade:
rx_len = sizeof(sak);
iso14443a_code_nvb_bits(&acf.nvb, 16);
ret = iso14443a_transceive_acf(handle, &acf, &bit_of_col);
if (ret < 0)
return ret;
DEBUGP("bit_of_col = %u\n", bit_of_col);
while (bit_of_col != ISO14443A_BITOFCOL_NONE) {
set_bit_in_field(&acf.uid_bits[0], bit_of_col-16);
iso14443a_code_nvb_bits(&acf.nvb, bit_of_col);
ret = iso14443a_transceive_acf(handle, &acf, &bit_of_col);
DEBUGP("bit_of_col = %u\n", bit_of_col);
if (ret < 0)
return ret;
}
iso14443a_code_nvb_bits(&acf.nvb, 7*8);
ret = iso14443a_transceive(handle, RFID_14443A_FRAME_REGULAR,
(unsigned char *)&acf, 7,
(unsigned char *) &sak, &rx_len,
TIMEOUT, 0);
if (ret < 0)
return ret;
if (sak[0] & 0x04) {
/* Cascade bit set, UID not complete */
switch (acf.sel_code) {
case ISO14443A_AC_SEL_CODE_CL1:
/* cascading from CL1 to CL2 */
if (acf.uid_bits[0] != 0x88) {
DEBUGP("Cascade bit set, but UID0 != 0x88\n");
return -1;
}
memcpy(&handle->uid[0], &acf.uid_bits[1], 3);
acf.sel_code = ISO14443A_AC_SEL_CODE_CL2;
h->level = ISO14443A_LEVEL_CL2;
break;
case ISO14443A_AC_SEL_CODE_CL2:
/* cascading from CL2 to CL3 */
memcpy(&handle->uid[3], &acf.uid_bits[1], 3);
acf.sel_code = ISO14443A_AC_SEL_CODE_CL3;
h->level = ISO14443A_LEVEL_CL3;
break;
default:
DEBUGP("cannot cascade any further than CL3\n");
h->state = ISO14443A_STATE_ERROR;
return -1;
break;
}
goto cascade;
} else {
switch (acf.sel_code) {
case ISO14443A_AC_SEL_CODE_CL1:
/* single size UID (4 bytes) */
memcpy(&handle->uid[0], &acf.uid_bits[0], 4);
break;
case ISO14443A_AC_SEL_CODE_CL2:
/* double size UID (7 bytes) */
memcpy(&handle->uid[3], &acf.uid_bits[0], 4);
break;
case ISO14443A_AC_SEL_CODE_CL3:
/* triple size UID (10 bytes) */
memcpy(&handle->uid[6], &acf.uid_bits[0], 4);
break;
}
}
h->level = ISO14443A_LEVEL_NONE;
h->state = ISO14443A_STATE_SELECTED;
{
if (uid_size == 1)
handle->uid_len = 4;
else if (uid_size == 2)
handle->uid_len = 7;
else
handle->uid_len = 10;
DEBUGP("UID %s\n", rfid_hexdump(handle->uid, handle->uid_len));
}
if (sak[0] & 0x20) {
DEBUGP("we have a T=CL compliant PICC\n");
handle->proto_supported = 1 << RFID_PROTOCOL_TCL;
h->tcl_capable = 1;
} else {
DEBUGP("we have a T!=CL PICC\n");
handle->proto_supported = (1 << RFID_PROTOCOL_MIFARE_UL)|
(1 << RFID_PROTOCOL_MIFARE_CLASSIC);
h->tcl_capable = 0;
}
return 0;
}
static int
iso14443a_hlta(struct rfid_layer2_handle *handle)
{
int ret;
unsigned char tx_buf[2] = { 0x50, 0x00 };
unsigned char rx_buf[10];
unsigned int rx_len = sizeof(rx_buf);
ret = iso14443a_transceive(handle, RFID_14443A_FRAME_REGULAR,
tx_buf, sizeof(tx_buf),
rx_buf, &rx_len, 1000 /* 1ms */, 0);
if (ret < 0) {
/* "error" case: we don't get somethng back from the card */
return 0;
}
return -1;
}
static int
iso14443a_setopt(struct rfid_layer2_handle *handle, int optname,
const void *optval, unsigned int optlen)
{
int ret = -EINVAL;
struct rfid_reader *rdr = handle->rh->reader;
unsigned int speed;
switch (optname) {
case RFID_OPT_14443A_SPEED_RX:
if (!rdr->iso14443a.set_speed)
return -ENOTSUP;
speed = *(unsigned int *)optval;
ret = rdr->iso14443a.set_speed(handle->rh, 0, speed);
break;
case RFID_OPT_14443A_SPEED_TX:
if (!rdr->iso14443a.set_speed)
return -ENOTSUP;
speed = *(unsigned int *)optval;
ret = rdr->iso14443a.set_speed(handle->rh, 1, speed);
break;
};
return ret;
}
static struct rfid_layer2_handle *
iso14443a_init(struct rfid_reader_handle *rh)
{
int ret;
struct rfid_layer2_handle *h = malloc_layer2_handle(sizeof(*h));
if (!h)
return NULL;
memset(h, 0, sizeof(*h));
h->l2 = &rfid_layer2_iso14443a;
h->rh = rh;
h->priv.iso14443a.state = ISO14443A_STATE_NONE;
h->priv.iso14443a.level = ISO14443A_LEVEL_NONE;
ret = h->rh->reader->iso14443a.init(h->rh);
if (ret < 0) {
free_layer2_handle(h);
return NULL;
}
return h;
}
static int
iso14443a_fini(struct rfid_layer2_handle *handle)
{
free_layer2_handle(handle);
return 0;
}
const struct rfid_layer2 rfid_layer2_iso14443a = {
.id = RFID_LAYER2_ISO14443A,
.name = "ISO 14443-3 A",
.fn = {
.init = &iso14443a_init,
.open = &iso14443a_anticol,
.transceive = &iso14443a_transceive,
.close = &iso14443a_hlta,
.fini = &iso14443a_fini,
.setopt = &iso14443a_setopt,
},
};
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