From b0fef13efe84d8601a9496098429b4a080e20c9e Mon Sep 17 00:00:00 2001 From: laforge Date: Sun, 29 May 2005 18:05:31 +0000 Subject: move librfid to new location in repository git-svn-id: https://svn.gnumonks.org/trunk/librfid@1181 e0336214-984f-0b4b-a45f-81c69e1f0ede --- rfid_proto_tcl.c | 448 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 448 insertions(+) create mode 100644 rfid_proto_tcl.c (limited to 'rfid_proto_tcl.c') diff --git a/rfid_proto_tcl.c b/rfid_proto_tcl.c new file mode 100644 index 0000000..299360e --- /dev/null +++ b/rfid_proto_tcl.c @@ -0,0 +1,448 @@ +/* ISO 14443-4 (T=CL) implementation, PCD side. + * + * (C) 2005 by Harald Welte + * + */ + +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include +#include + +#include "rfid_iso14443_common.h" + + +static unsigned int sfgi_to_sfgt(struct rfid_protocol_handle *h, + unsigned char sfgi) +{ + /* ISO 14443-4:2000(E) Section 5.2.5. */ + return (256 * 16 / h->l2h->rh->ah->fc) * (2 ^ sfgi); +} + +static unsigned int fwi_to_fwt(struct rfid_protocol_handle *h, + unsigned char fwi) +{ + /* ISO 14443-4:2000(E) Section 7.2. */ + return (256*16 / h->l2h->rh->ah->fc) * (2 ^ fwi); +} + +#define activation_fwt(x) (65536 / x->l2h->rh->ah->fc) +#define deactivation_fwt(x) activation_fwt(x) + +static int +tcl_parse_ats(struct rfid_protocol_handle *h, + unsigned char *ats, unsigned int size) +{ + unsigned char len = ats[0]; + unsigned char t0; + unsigned char *cur; + + if (len == 0 || size == 0) + return -1; + + if (size < len) + len = size; + + if (len == 1) { + /* FIXME: assume some default values */ + h->priv.tcl.fsc = 32; + h->priv.tcl.ta = 0; + h->priv.tcl.sfgt = sfgi_to_sfgt(h, 0); + if (1 /* FIXME: is_iso14443a */) { + /* Section 7.2: fwi default for type A is 4 */ + h->priv.tcl.fwt = fwi_to_fwt(h, 4); + } else { + /* Section 7.2: fwi for type B is always in ATQB */ + /* FIXME */ + } + return 0; + } + + /* guarateed to be at least 2 bytes in size */ + + t0 = ats[1]; + cur = &ats[2]; + + iso14443_fsdi_to_fsd(&h->priv.tcl.fsc, t0 & 0x0f); + + if (t0 & (1 << 4)) { + /* TA is transmitted */ + h->priv.tcl.ta = *cur++; + } + + if (t0 & (1 << 5)) { + /* TB is transmitted */ + h->priv.tcl.sfgt = sfgi_to_sfgt(h, *cur & 0x0f); + h->priv.tcl.fwt = fwi_to_fwt(h, (*cur & 0xf0) >> 4); + cur++; + } + + if (t0 & (1 << 6)) { + /* TC is transmitted */ + if (*cur & 0x01) + h->priv.tcl.flags |= TCL_HANDLE_F_NAD_SUPPORTED; + if (*cur & 0x02) + h->priv.tcl.flags |= TCL_HANDLE_F_CID_SUPPORTED; + cur++; + } + + h->priv.tcl.historical_len = (ats+len) - cur; + h->priv.tcl.historical_bytes = cur; + + return 0; +} + + +/* request an ATS from the PICC */ +static int +tcl_request_ats(struct rfid_protocol_handle *h) +{ + int ret; + unsigned char rats[2]; + unsigned char fsdi; + + if (h->priv.tcl.state != TCL_STATE_INITIAL) + return -1; + + ret = iso14443_fsd_to_fsdi(&fsdi, h->priv.tcl.fsd); + if (ret < 0) { + DEBUGP("unable to encode FSD of %u as FSDI\n", h->priv.tcl.fsd); + return ret; + } + + rats[0] = 0xe0; + rats[1] = (h->priv.tcl.cid & 0x0f) | ((fsdi << 4) & 0xf0); + + /* transcieve (with CRC) */ + ret = h->l2h->l2->fn.transcieve(h->l2h, rats, 2, h->priv.tcl.ats, + &h->priv.tcl.ats_len, activation_fwt(h), + TCL_TRANSP_F_TX_CRC); + if (ret < 0) { + DEBUGP("transcieve of rats failed\n"); + h->priv.tcl.state = TCL_STATE_RATS_SENT; + /* FIXME: retransmit */ + return ret; + } + h->priv.tcl.state = TCL_STATE_ATS_RCVD; + + ret = tcl_parse_ats(h, h->priv.tcl.ats, h->priv.tcl.ats_len); + if (ret < 0) { + DEBUGP("parsing of ats failed\n"); + return ret; + } + + return 0; +} +/* start a PSS run (autimatically configure highest possible speed */ +static int +tcl_do_pss(struct rfid_protocol_handle *h) +{ + unsigned char ppss[3]; + unsigned char pps_response[1]; + + if (h->priv.tcl.state != TCL_STATE_ATS_RCVD) + return -1; + + /* ISO 14443-4:2000(E) Section 5.3. */ + + ppss[0] = 0xd0 & (h->priv.tcl.cid & 0x0f); + ppss[1] = 0x11; + + //ppss[2] = 0x00 & foo; + + // FIXME: finish + + return -1; + + h->priv.tcl.state = TCL_STATE_ESTABLISHED; +} + + +static int +tcl_build_prologue2(struct tcl_handle *th, + unsigned char *prlg, unsigned int *prlg_len, + unsigned char pcb) +{ + *prlg_len = 1; + + *prlg = pcb; + + if (th->flags & TCL_HANDLE_F_CID_USED) { + /* ISO 14443-4:2000(E) Section 7.1.1.2 */ + *prlg |= TCL_PCB_CID_FOLLOWING; + (*prlg_len)++; + prlg[*prlg_len] = th->cid & 0x0f; + } + + /* nad only for I-block (0xc0 == 00) */ + if ((th->flags & TCL_HANDLE_F_NAD_USED) && + ((pcb & 0xc0) == 0x00)) { + /* ISO 14443-4:2000(E) Section 7.1.1.3 */ + /* FIXME: in case of chaining only for first frame */ + *prlg |= TCL_PCB_NAD_FOLLOWING; + prlg[*prlg_len] = th->nad; + (*prlg_len)++; + } + + return 0; +} + +static int +tcl_build_prologue_i(struct tcl_handle *th, + unsigned char *prlg, unsigned int *prlg_len) +{ + /* ISO 14443-4:2000(E) Section 7.1.1.1 */ + return tcl_build_prologue2(th, prlg, prlg_len, 0x02); +} + +static int +tcl_build_prologue_r(struct tcl_handle *th, + unsigned char *prlg, unsigned int *prlg_len, + unsigned int nak) +{ + unsigned char pcb = 0xa2; + /* ISO 14443-4:2000(E) Section 7.1.1.1 */ + + if (nak) + pcb |= 0x10; + + return tcl_build_prologue2(th, prlg, prlg_len, pcb); +} + +static int +tcl_build_prologue_s(struct tcl_handle *th, + unsigned char *prlg, unsigned int *prlg_len) +{ + /* ISO 14443-4:2000(E) Section 7.1.1.1 */ + + /* the only S-block from PCD->PICC is DESELECT: */ + return tcl_build_prologue2(th, prlg, prlg_len, 0xc2); +} + +/* FIXME: WTXM implementation */ + +static int tcl_prlg_len(struct tcl_handle *th) +{ + int prlg_len = 1; + + if (th->flags & TCL_HANDLE_F_CID_USED) + prlg_len++; + + if (th->flags & TCL_HANDLE_F_NAD_USED) + prlg_len++; + + return prlg_len; +} + +#define max_net_tx_framesize(x) (x->fsc - tcl_prlg_len(x)) + +static int +tcl_connect(struct rfid_protocol_handle *h) +{ + int ret; + + if (h->priv.tcl.state != TCL_STATE_DESELECTED && + h->priv.tcl.state != TCL_STATE_INITIAL) + return -1; + + switch (h->l2h->l2->id) { + case RFID_LAYER2_ISO14443A: + /* Start Type A T=CL Activation Sequence */ + ret = tcl_request_ats(h); + if (ret < 0) + return ret; + + if (0 /* FIXME */) { + ret = tcl_do_pss(h); + if (ret < 0) + return -1; + } + break; + case RFID_LAYER2_ISO14443B: + /* initialized T=CL state from Type B Activation Data */ + h->priv.tcl.cid = h->l2h->priv.iso14443b.cid; + h->priv.tcl.fsc = h->l2h->priv.iso14443b.fsc; + h->priv.tcl.fsd = h->l2h->priv.iso14443b.fsd; + h->priv.tcl.fwt = h->l2h->priv.iso14443b.fwt; + + /* what about ta? sfgt? */ + + if (h->l2h->priv.iso14443b.flags & ISO14443B_CID_SUPPORTED) + h->priv.tcl.flags |= TCL_HANDLE_F_CID_SUPPORTED; + if (h->l2h->priv.iso14443b.flags & ISO14443B_NAD_SUPPORTED) + h->priv.tcl.flags |= TCL_HANDLE_F_NAD_SUPPORTED; + + switch (h->l2h->priv.iso14443b.state) { + case ISO14443B_STATE_SELECTED: + h->priv.tcl.state = TCL_STATE_ATS_RCVD; + break; + case ISO14443B_STATE_ATTRIB_SENT: + h->priv.tcl.state = TCL_STATE_RATS_SENT; + break; + } + + /* PUPI will be presented as ATS/historical bytes */ + memcpy(h->priv.tcl.ats, h->l2h->priv.iso14443b.pupi, 4); + h->priv.tcl.ats_len = 4; + h->priv.tcl.historical_bytes = h->priv.tcl.ats; + + break; + default: + DEBUGP("unsupported l2: %u\n", h->l2h->l2->id); + return -1; + break; + } + + return 0; +} + +static int +tcl_deselect(struct rfid_protocol_handle *h) +{ + /* ISO 14443-4:2000(E) Section 8 */ + int ret; + unsigned char frame[3]; /* 3 bytes prologue, no information */ + unsigned char rx[3]; + unsigned int rx_len = sizeof(rx); + unsigned int prlg_len; + struct tcl_handle *th = &h->priv.tcl; + + if (th->state != TCL_STATE_ESTABLISHED) { + /* FIXME: not sure whether deselect is possible here, + * probably better send a HLTA? */ + } + + /* build DESELECT S-block */ + ret = tcl_build_prologue_s(th, frame, &prlg_len); + if (ret < 0) + return ret; + + ret = h->l2h->l2->fn.transcieve(h->l2h, frame, prlg_len, rx, + &rx_len, deactivation_fwt(h), + TCL_TRANSP_F_TX_CRC); + if (ret < 0) { + /* FIXME: retransmit, HLT(A|B) */ + return ret; + } + + th->state = TCL_STATE_DESELECTED; + + return 0; +} + +static int +tcl_transcieve(struct rfid_protocol_handle *h, + const unsigned char *tx_data, unsigned int tx_len, + unsigned char *rx_data, unsigned int *rx_len, + unsigned int timeout, unsigned int flags) +{ + int ret; + unsigned char *tx_buf, *rx_buf; + unsigned int prlg_len; + struct tcl_handle *th = &h->priv.tcl; + + if (tx_len > max_net_tx_framesize(th)) { + /* slow path: we need to use chaining */ + return -1; + } + + tx_buf = malloc(tcl_prlg_len(th) + tx_len); + if (!tx_buf) { + ret = -ENOMEM; + goto out; + } + rx_buf = malloc(tcl_prlg_len(th) + *rx_len); + if (!rx_buf) { + ret = -ENOMEM; + goto out_txb; + } + + if (tcl_build_prologue_i(th, tx_buf, &prlg_len) < 0) { + ret = -1; + goto out_rxb; + } + memcpy(tx_buf + prlg_len, tx_data, tx_len); + + ret = h->l2h->l2->fn.transcieve(h->l2h, tx_buf, tx_len+prlg_len, + rx_buf, rx_len, th->fwt, 0); + if (ret < 0) + goto out_rxb; + + + memcpy(rx_data, rx_buf, *rx_len); + +out_rxb: + free(rx_buf); +out_txb: + free(tx_buf); +out: + return ret; +} + +#if 0 +int +tcl_send(struct tcl_handle *th) +{ + return -1; +} + +int +tcl_recv() +{ + return -1; +} +#endif + +static struct rfid_protocol_handle * +tcl_init(struct rfid_layer2_handle *l2h) +{ + struct rfid_protocol_handle *th; + unsigned int mru = l2h->rh->ah->mru; + + th = malloc(sizeof(struct rfid_protocol_handle) + mru); + if (!th) + return NULL; + + /* FIXME: mru should be attribute of layer2 (in case it adds/removes + * some overhead */ + memset(th, 0, sizeof(struct rfid_protocol_handle) + mru); + + /* maximum received ats length equals mru of asic/reader */ + th->priv.tcl.state = TCL_STATE_INITIAL; + th->priv.tcl.ats_len = mru; + th->l2h = l2h; + th->proto = &rfid_protocol_tcl; + + th->priv.tcl.fsd = iso14443_fsd_approx(mru); + + return th; +} + +static int +tcl_fini(struct rfid_protocol_handle *ph) +{ + free(ph); + return 0; +} + +struct rfid_protocol rfid_protocol_tcl = { + .id = RFID_PROTOCOL_TCL, + .name = "ISO 14443-4 / T=CL", + .fn = { + .init = &tcl_init, + .open = &tcl_connect, + .transcieve = &tcl_transcieve, + .close = &tcl_deselect, + .fini = &tcl_fini, + }, +}; -- cgit v1.2.3