Harald Welte | 9d3e382 | 2015-11-09 00:50:54 +0100 | [diff] [blame] | 1 | /* ISO7816-3 state machine for the card side */ |
| 2 | /* (C) 2010-2015 by Harald Welte <hwelte@hmw-consulting.de> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <errno.h> |
| 21 | #include <string.h> |
| 22 | #include <stdint.h> |
| 23 | #include <sys/types.h> |
| 24 | |
| 25 | #include "utils.h" |
| 26 | #include "trace.h" |
| 27 | #include "iso7816_fidi.h" |
| 28 | #include "tc_etu.h" |
| 29 | #include "card_emu.h" |
| 30 | #include "req_ctx.h" |
| 31 | #include "cardemu_prot.h" |
| 32 | |
| 33 | |
| 34 | #define NUM_SLOTS 2 |
| 35 | |
| 36 | #define ISO7816_3_INIT_WTIME 9600 |
| 37 | #define ISO7816_3_DEFAULT_WI 10 |
| 38 | #define ISO7816_3_ATR_LEN_MAX (1+32) /* TS plus 32 chars */ |
| 39 | |
| 40 | #define ISO7816_3_PB_NULL 0x60 |
| 41 | |
| 42 | enum iso7816_3_card_state { |
| 43 | ISO_S_WAIT_POWER, /* waiting for power being applied */ |
| 44 | ISO_S_WAIT_CLK, /* waiting for clock being applied */ |
| 45 | ISO_S_WAIT_RST, /* waiting for reset being released */ |
| 46 | ISO_S_WAIT_ATR, /* waiting for start of ATR */ |
| 47 | ISO_S_IN_ATR, /* transmitting ATR to reader */ |
| 48 | ISO_S_IN_PTS, /* transmitting ATR to reader */ |
| 49 | ISO_S_WAIT_TPDU, /* waiting for data from reader */ |
| 50 | ISO_S_IN_TPDU, /* inside a TPDU */ |
| 51 | }; |
| 52 | |
| 53 | /* detailed sub-states of ISO_S_IN_PTS */ |
| 54 | enum pts_state { |
| 55 | PTS_S_WAIT_REQ_PTSS, |
| 56 | PTS_S_WAIT_REQ_PTS0, |
| 57 | PTS_S_WAIT_REQ_PTS1, |
| 58 | PTS_S_WAIT_REQ_PTS2, |
| 59 | PTS_S_WAIT_REQ_PTS3, |
| 60 | PTS_S_WAIT_REQ_PCK, |
| 61 | PTS_S_WAIT_RESP_PTSS = PTS_S_WAIT_REQ_PTSS | 0x10, |
| 62 | PTS_S_WAIT_RESP_PTS0 = PTS_S_WAIT_REQ_PTS0 | 0x10, |
| 63 | PTS_S_WAIT_RESP_PTS1 = PTS_S_WAIT_REQ_PTS1 | 0x10, |
| 64 | PTS_S_WAIT_RESP_PTS2 = PTS_S_WAIT_REQ_PTS2 | 0x10, |
| 65 | PTS_S_WAIT_RESP_PTS3 = PTS_S_WAIT_REQ_PTS3 | 0x10, |
| 66 | PTS_S_WAIT_RESP_PCK = PTS_S_WAIT_REQ_PCK | 0x10, |
| 67 | }; |
| 68 | |
| 69 | #define _PTSS 0 |
| 70 | #define _PTS0 1 |
| 71 | #define _PTS1 2 |
| 72 | #define _PTS2 3 |
| 73 | #define _PTS3 4 |
| 74 | #define _PCK 5 |
| 75 | |
Harald Welte | 16cf408 | 2015-11-11 19:02:48 +0100 | [diff] [blame^] | 76 | /* T-PDU state machine states */ |
Harald Welte | 9d3e382 | 2015-11-09 00:50:54 +0100 | [diff] [blame] | 77 | enum tpdu_state { |
Harald Welte | 16cf408 | 2015-11-11 19:02:48 +0100 | [diff] [blame^] | 78 | TPDU_S_WAIT_CLA, /* waiting for CLA byte from reader */ |
| 79 | TPDU_S_WAIT_INS, /* waiting for INS byte from reader */ |
| 80 | TPDU_S_WAIT_P1, /* waiting for P1 byte from reader */ |
| 81 | TPDU_S_WAIT_P2, /* waiting for P2 byte from reader */ |
| 82 | TPDU_S_WAIT_P3, /* waiting for P3 byte from reader */ |
Harald Welte | 9d3e382 | 2015-11-09 00:50:54 +0100 | [diff] [blame] | 83 | TPDU_S_WAIT_PB, /* waiting for Tx of procedure byte */ |
| 84 | TPDU_S_WAIT_RX, /* waiitng for more data from reader */ |
| 85 | TPDU_S_WAIT_TX, /* waiting for more data to reader */ |
| 86 | }; |
| 87 | |
| 88 | #define _CLA 0 |
| 89 | #define _INS 1 |
| 90 | #define _P1 2 |
| 91 | #define _P2 3 |
| 92 | #define _P3 4 |
| 93 | |
| 94 | struct card_handle { |
| 95 | enum iso7816_3_card_state state; |
| 96 | |
| 97 | /* signal levels */ |
| 98 | uint8_t vcc_active; /* 1 = on, 0 = off */ |
| 99 | uint8_t in_reset; /* 1 = RST low, 0 = RST high */ |
| 100 | uint8_t clocked; /* 1 = active, 0 = inactive */ |
| 101 | |
Harald Welte | 16cf408 | 2015-11-11 19:02:48 +0100 | [diff] [blame^] | 102 | /* timing parameters, from PTS */ |
Harald Welte | 9d3e382 | 2015-11-09 00:50:54 +0100 | [diff] [blame] | 103 | uint8_t fi; |
| 104 | uint8_t di; |
| 105 | uint8_t wi; |
| 106 | |
| 107 | uint8_t tc_chan; /* TC channel number */ |
| 108 | uint8_t uart_chan; /* UART channel */ |
| 109 | |
| 110 | uint32_t waiting_time; /* in clocks */ |
| 111 | |
| 112 | /* ATR state machine */ |
| 113 | struct { |
| 114 | uint8_t idx; |
| 115 | uint8_t len; |
| 116 | //uint8_t hist_len; |
| 117 | //uint8_t last_td; |
| 118 | uint8_t atr[ISO7816_3_ATR_LEN_MAX]; |
| 119 | } atr; |
| 120 | |
| 121 | /* PPS / PTS support */ |
| 122 | struct { |
| 123 | enum pts_state state; |
Harald Welte | 16cf408 | 2015-11-11 19:02:48 +0100 | [diff] [blame^] | 124 | uint8_t req[6]; /* request bytes */ |
| 125 | uint8_t resp[6]; /* response bytes */ |
Harald Welte | 9d3e382 | 2015-11-09 00:50:54 +0100 | [diff] [blame] | 126 | } pts; |
| 127 | |
| 128 | /* TPDU */ |
| 129 | struct { |
| 130 | enum tpdu_state state; |
Harald Welte | 16cf408 | 2015-11-11 19:02:48 +0100 | [diff] [blame^] | 131 | uint8_t hdr[5]; /* CLA INS P1 P2 P3 */ |
Harald Welte | 9d3e382 | 2015-11-09 00:50:54 +0100 | [diff] [blame] | 132 | } tpdu; |
| 133 | |
Harald Welte | 16cf408 | 2015-11-11 19:02:48 +0100 | [diff] [blame^] | 134 | struct req_ctx *uart_rx_ctx; /* UART RX -> USB TX */ |
| 135 | struct req_ctx *uart_tx_ctx; /* USB RX -> UART TX */ |
Harald Welte | 9d3e382 | 2015-11-09 00:50:54 +0100 | [diff] [blame] | 136 | |
| 137 | struct { |
| 138 | uint32_t tx_bytes; |
| 139 | uint32_t rx_bytes; |
| 140 | uint32_t pps; |
| 141 | } stats; |
| 142 | }; |
| 143 | |
| 144 | static int update_fidi(struct card_handle *ch) |
| 145 | { |
| 146 | int rc; |
| 147 | |
| 148 | rc = compute_fidi_ratio(ch->fi, ch->di); |
| 149 | if (rc > 0 && rc < 0x400) { |
| 150 | TRACE_DEBUG("computed Fi(%u) Di(%u) ratio: %d\n", |
| 151 | ch->fi, ch->di, rc); |
| 152 | /* make sure UART uses new F/D ratio */ |
| 153 | card_emu_uart_update_fidi(ch->uart_chan, rc); |
| 154 | /* notify ETU timer about this */ |
| 155 | tc_etu_set_etu(ch->tc_chan, rc); |
| 156 | } else |
| 157 | TRACE_DEBUG("computed FiDi ration %d unsupported\n", rc); |
| 158 | } |
| 159 | |
| 160 | /* Update the ISO 7816-3 TPDU receiver state */ |
| 161 | static void card_set_state(struct card_handle *ch, |
| 162 | enum iso7816_3_card_state new_state) |
| 163 | { |
| 164 | switch (new_state) { |
| 165 | case ISO_S_WAIT_POWER: |
| 166 | case ISO_S_WAIT_CLK: |
| 167 | case ISO_S_WAIT_RST: |
| 168 | /* disable Rx and Tx of UART */ |
| 169 | card_emu_uart_enable(ch->uart_chan, 0); |
| 170 | break; |
| 171 | case ISO_S_WAIT_ATR: |
| 172 | /* Reset to initial Fi / Di ratio */ |
| 173 | ch->fi = 1; |
| 174 | ch->di = 1; |
| 175 | update_fidi(ch); |
| 176 | /* initialize todefault WI, this will be overwritten if we |
| 177 | * receive TC2, and it will be programmed into hardware after |
| 178 | * ATR is finished */ |
| 179 | ch->wi = ISO7816_3_DEFAULT_WI; |
| 180 | /* update waiting time to initial waiting time */ |
| 181 | ch->waiting_time = ISO7816_3_INIT_WTIME; |
| 182 | tc_etu_set_wtime(ch->tc_chan, ch->waiting_time); |
| 183 | /* Set ATR sub-state to initial state */ |
| 184 | ch->atr.idx = 0; |
| 185 | //set_atr_state(ch, ATR_S_WAIT_TS); |
| 186 | /* Notice that we are just coming out of reset */ |
| 187 | //ch->sh.flags |= SIMTRACE_FLAG_ATR; |
| 188 | card_emu_uart_enable(ch->uart_chan, ENABLE_TX); |
| 189 | break; |
| 190 | break; |
| 191 | case ISO_S_WAIT_TPDU: |
| 192 | /* enable the receiver, disable transmitter */ |
| 193 | card_emu_uart_enable(ch->uart_chan, ENABLE_RX); |
| 194 | break; |
| 195 | case ISO_S_IN_ATR: |
| 196 | case ISO_S_IN_PTS: |
| 197 | case ISO_S_IN_TPDU: |
| 198 | /* do nothing */ |
| 199 | break; |
| 200 | } |
| 201 | |
| 202 | if (ch->state == new_state) |
| 203 | return; |
| 204 | |
| 205 | TRACE_DEBUG("7816 card state %u -> %u\n", ch->state, new_state); |
| 206 | ch->state = new_state; |
| 207 | } |
| 208 | |
| 209 | |
| 210 | /********************************************************************** |
| 211 | * PTS / PPS handling |
| 212 | **********************************************************************/ |
| 213 | |
| 214 | /* Update the ATR sub-state */ |
| 215 | static void set_pts_state(struct card_handle *ch, enum pts_state new_ptss) |
| 216 | { |
| 217 | TRACE_DEBUG("7816 PTS state %u -> %u\n", ch->pts.state, new_ptss); |
| 218 | ch->pts.state = new_ptss; |
| 219 | } |
| 220 | |
| 221 | /* Determine the next PTS state */ |
| 222 | static enum pts_state next_pts_state(struct card_handle *ch) |
| 223 | { |
| 224 | uint8_t is_resp = ch->pts.state & 0x10; |
| 225 | uint8_t sstate = ch->pts.state & 0x0f; |
| 226 | uint8_t *pts_ptr; |
| 227 | |
| 228 | if (!is_resp) |
| 229 | pts_ptr = ch->pts.req; |
| 230 | else |
| 231 | pts_ptr = ch->pts.resp; |
| 232 | |
| 233 | switch (sstate) { |
| 234 | case PTS_S_WAIT_REQ_PTSS: |
| 235 | goto from_ptss; |
| 236 | case PTS_S_WAIT_REQ_PTS0: |
| 237 | goto from_pts0; |
| 238 | case PTS_S_WAIT_REQ_PTS1: |
| 239 | goto from_pts1; |
| 240 | case PTS_S_WAIT_REQ_PTS2: |
| 241 | goto from_pts2; |
| 242 | case PTS_S_WAIT_REQ_PTS3: |
| 243 | goto from_pts3; |
| 244 | } |
| 245 | |
| 246 | if (ch->pts.state == PTS_S_WAIT_REQ_PCK) |
| 247 | return PTS_S_WAIT_RESP_PTSS; |
| 248 | |
| 249 | from_ptss: |
| 250 | return PTS_S_WAIT_REQ_PTS0 | is_resp; |
| 251 | from_pts0: |
| 252 | if (pts_ptr[_PTS0] & (1 << 4)) |
| 253 | return PTS_S_WAIT_REQ_PTS1 | is_resp; |
| 254 | from_pts1: |
| 255 | if (pts_ptr[_PTS0] & (1 << 5)) |
| 256 | return PTS_S_WAIT_REQ_PTS2 | is_resp; |
| 257 | from_pts2: |
| 258 | if (pts_ptr[_PTS0] & (1 << 6)) |
| 259 | return PTS_S_WAIT_REQ_PTS3 | is_resp; |
| 260 | from_pts3: |
| 261 | return PTS_S_WAIT_REQ_PCK | is_resp; |
| 262 | } |
| 263 | |
| 264 | |
| 265 | static enum iso7816_3_card_state |
| 266 | process_byte_pts(struct card_handle *ch, uint8_t byte) |
| 267 | { |
| 268 | switch (ch->pts.state) { |
| 269 | case PTS_S_WAIT_REQ_PTSS: |
| 270 | ch->pts.req[_PTSS] = byte; |
| 271 | break; |
| 272 | case PTS_S_WAIT_REQ_PTS0: |
| 273 | ch->pts.req[_PTS0] = byte; |
| 274 | break; |
| 275 | case PTS_S_WAIT_REQ_PTS1: |
| 276 | ch->pts.req[_PTS1] = byte; |
| 277 | break; |
| 278 | case PTS_S_WAIT_REQ_PTS2: |
| 279 | ch->pts.req[_PTS2] = byte; |
| 280 | break; |
| 281 | case PTS_S_WAIT_REQ_PTS3: |
| 282 | ch->pts.req[_PTS3] = byte; |
| 283 | break; |
| 284 | case PTS_S_WAIT_REQ_PCK: |
| 285 | ch->pts.req[_PCK] = byte; |
| 286 | /* FIXME: check PCK */ |
| 287 | memcpy(ch->pts.resp, ch->pts.req, sizeof(ch->pts.resp)); |
| 288 | break; |
| 289 | } |
| 290 | /* calculate the next state and set it */ |
| 291 | set_pts_state(ch, next_pts_state(ch)); |
| 292 | |
| 293 | return ISO_S_IN_PTS; |
| 294 | } |
| 295 | |
| 296 | /* return a single byte to be transmitted to the reader */ |
| 297 | static int get_byte_pps(struct card_handle *ch, uint8_t *byte) |
| 298 | { |
| 299 | /* FIXME */ |
| 300 | #if 0 |
| 301 | switch (ch->pts.state) { |
| 302 | case PTS_S_WAIT_RESP_PTSS: |
| 303 | ch->pts.resp[_PTSS] = byte; |
| 304 | break; |
| 305 | case PTS_S_WAIT_RESP_PTS0: |
| 306 | ch->pts.resp[_PTS0] = byte; |
| 307 | break; |
| 308 | case PTS_S_WAIT_RESP_PTS1: |
| 309 | /* This must be TA1 */ |
| 310 | ch->fi = byte >> 4; |
| 311 | ch->di = byte & 0xf; |
| 312 | TRACE_DEBUG("found Fi=%u Di=%u\n", ch->fi, ch->di); |
| 313 | ch->sh.flags |= SIMTRACE_FLAG_PPS_FIDI; |
| 314 | ch->pts.resp[_PTS1] = byte; |
| 315 | break; |
| 316 | case PTS_S_WAIT_RESP_PTS2: |
| 317 | ch->pts.resp[_PTS2] = byte; |
| 318 | break; |
| 319 | case PTS_S_WAIT_RESP_PTS3: |
| 320 | ch->pts.resp[_PTS3] = byte; |
| 321 | break; |
| 322 | case PTS_S_WAIT_RESP_PCK: |
| 323 | ch->pts.resp[_PCK] = byte; |
| 324 | /* FIXME: check PCK */ |
| 325 | set_pts_state(ch, PTS_S_WAIT_REQ_PTSS); |
| 326 | /* update baud rate generator with Fi/Di */ |
| 327 | update_fidi(ch); |
| 328 | /* Wait for the next TPDU */ |
| 329 | card_set_state(ch, ISO_S_WAIT_TPDU); |
| 330 | } |
| 331 | #endif |
| 332 | /* calculate the next state and set it */ |
| 333 | set_pts_state(ch, next_pts_state(ch)); |
| 334 | |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | |
| 339 | /********************************************************************** |
| 340 | * TPDU handling |
| 341 | **********************************************************************/ |
| 342 | |
| 343 | /* add a just-received TPDU byte (from reader) to USB buffer */ |
| 344 | static void add_tpdu_byte(struct card_handle *ch, uint8_t byte) |
| 345 | { |
| 346 | struct req_ctx *rctx; |
| 347 | struct cardemu_usb_msg_rx_data *rd; |
| 348 | |
| 349 | /* ensure we have a buffer */ |
| 350 | if (!ch->uart_rx_ctx) { |
| 351 | ch->uart_rx_ctx = req_ctx_find_get(1, RCTX_S_FREE, RCTX_S_UART_RX_BUSY); |
| 352 | if (!ch->uart_rx_ctx) |
| 353 | return; |
| 354 | rd = (struct cardemu_usb_msg_rx_data *) ch->uart_rx_ctx->data; |
| 355 | cardemu_hdr_set(&rd->hdr, CEMU_USB_MSGT_DO_RX_DATA); |
| 356 | rctx->tot_len = sizeof(*rd); |
| 357 | rctx->idx = 0; |
| 358 | } else |
| 359 | rctx = ch->uart_rx_ctx; |
| 360 | |
| 361 | rd = (struct cardemu_usb_msg_rx_data *) rctx->data; |
| 362 | |
| 363 | rd->data[rctx->idx++] = byte; |
| 364 | rctx->tot_len++; |
| 365 | |
| 366 | /* check if the buffer is full. If so, send it */ |
| 367 | if (rctx->tot_len >= rctx->size) { |
| 368 | /* store length of data payload fild in header */ |
| 369 | rd->hdr.data_len = rctx->idx; |
| 370 | req_ctx_set_state(rctx, RCTX_S_USB_TX_PENDING); |
| 371 | ch->uart_rx_ctx = NULL; |
| 372 | /* FIXME: call into USB code to see if this buffer can |
| 373 | * be transmitted now */ |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | static void set_tpdu_state(struct card_handle *ch, enum tpdu_state new_ts) |
| 378 | { |
| 379 | TRACE_DEBUG("7816 TPDU state %u -> %u\n", ch->tpdu.state, new_ts); |
| 380 | switch (new_ts) { |
| 381 | case TPDU_S_WAIT_CLA: |
| 382 | card_emu_uart_enable(ch->uart_chan, ENABLE_RX); |
| 383 | break; |
| 384 | case TPDU_S_WAIT_PB: |
| 385 | /* we just completed the TPDU header from reader to card |
| 386 | * and now need to disable the receiver, enable the |
| 387 | * transmitter and transmit the procedure byte */ |
| 388 | card_emu_uart_enable(ch->uart_chan, ENABLE_TX); |
| 389 | break; |
| 390 | } |
| 391 | ch->tpdu.state = new_ts; |
| 392 | } |
| 393 | |
| 394 | static enum tpdu_state next_tpdu_state(struct card_handle *ch) |
| 395 | { |
| 396 | switch (ch->tpdu.state) { |
| 397 | case TPDU_S_WAIT_CLA: |
| 398 | return TPDU_S_WAIT_INS; |
| 399 | case TPDU_S_WAIT_INS: |
| 400 | return TPDU_S_WAIT_P1; |
| 401 | case TPDU_S_WAIT_P1: |
| 402 | return TPDU_S_WAIT_P2; |
| 403 | case TPDU_S_WAIT_P2: |
| 404 | return TPDU_S_WAIT_P3; |
| 405 | case TPDU_S_WAIT_P3: |
| 406 | return TPDU_S_WAIT_PB; |
| 407 | /* simply stay in Rx or Tx by default */ |
| 408 | case TPDU_S_WAIT_PB: |
| 409 | return TPDU_S_WAIT_PB; |
| 410 | case TPDU_S_WAIT_RX: |
| 411 | return TPDU_S_WAIT_RX; |
| 412 | case TPDU_S_WAIT_TX: |
| 413 | return TPDU_S_WAIT_TX; |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | static void send_tpdu_header(struct card_handle *ch) |
| 418 | { |
| 419 | struct req_ctx *rctx; |
| 420 | struct cardemu_usb_msg_rx_data *rd; |
| 421 | |
| 422 | /* if we already/still have a context, send it off */ |
| 423 | if (ch->uart_rx_ctx && rctx->idx) { |
| 424 | ch->uart_rx_ctx = NULL; |
| 425 | } |
| 426 | |
| 427 | /* ensure we have a new buffer */ |
| 428 | ch->uart_rx_ctx = req_ctx_find_get(1, RCTX_S_FREE, RCTX_S_UART_RX_BUSY); |
| 429 | if (!ch->uart_rx_ctx) |
| 430 | return; |
| 431 | rctx = ch->uart_rx_ctx; |
| 432 | rd = (struct cardemu_usb_msg_rx_data *) rctx->data; |
| 433 | |
| 434 | /* initializ header */ |
| 435 | cardemu_hdr_set(&rd->hdr, CEMU_USB_MSGT_DO_RX_DATA); |
| 436 | rd->flags = CEMU_DATA_F_TPDU_HDR; |
| 437 | rctx->tot_len = sizeof(*rd) + sizeof(ch->tpdu.hdr); |
| 438 | rctx->idx = 0; |
| 439 | |
| 440 | /* copy TPDU header to data field */ |
| 441 | memcpy(rd->data, ch->tpdu.hdr, sizeof(ch->tpdu.hdr)); |
| 442 | rd->hdr.data_len = sizeof(ch->tpdu.hdr); |
| 443 | |
| 444 | req_ctx_set_state(rctx, RCTX_S_USB_TX_PENDING); |
| 445 | } |
| 446 | |
| 447 | static enum iso7816_3_card_state |
| 448 | process_byte_tpdu(struct card_handle *ch, uint8_t byte) |
| 449 | { |
| 450 | switch (ch->tpdu.state) { |
| 451 | case TPDU_S_WAIT_CLA: |
| 452 | ch->tpdu.hdr[_CLA] = byte; |
| 453 | break; |
| 454 | case TPDU_S_WAIT_INS: |
| 455 | ch->tpdu.hdr[_INS] = byte; |
| 456 | break; |
| 457 | case TPDU_S_WAIT_P1: |
| 458 | ch->tpdu.hdr[_P1] = byte; |
| 459 | break; |
| 460 | case TPDU_S_WAIT_P2: |
| 461 | ch->tpdu.hdr[_P2] = byte; |
| 462 | break; |
| 463 | case TPDU_S_WAIT_P3: |
| 464 | ch->tpdu.hdr[_P3] = byte; |
| 465 | /* FIXME: start timer to transmit further 0x60 */ |
| 466 | /* send the TPDU header as part of a procedure byte |
| 467 | * request to the USB host */ |
| 468 | send_tpdu_header(ch); |
| 469 | break; |
| 470 | case TPDU_S_WAIT_RX: |
| 471 | add_tpdu_byte(ch, byte); |
| 472 | break; |
| 473 | default: |
| 474 | TRACE_DEBUG("process_byte_tpdu() in invalid state %u\n", |
| 475 | ch->tpdu.state); |
| 476 | } |
| 477 | set_tpdu_state(ch, next_tpdu_state(ch)); |
| 478 | |
| 479 | /* ensure we stay in TPDU ISO state */ |
| 480 | return ISO_S_IN_TPDU; |
| 481 | } |
| 482 | |
| 483 | /* return a single byte to be transmitted to the reader */ |
| 484 | static int get_byte_tpdu(struct card_handle *ch, uint8_t *byte) |
| 485 | { |
| 486 | struct req_ctx *rctx; |
| 487 | struct cardemu_usb_msg_tx_data *td; |
| 488 | |
| 489 | /* ensure we are aware of any data that might be pending for |
| 490 | * transmit */ |
| 491 | if (!ch->uart_tx_ctx) { |
| 492 | ch->uart_tx_ctx = req_ctx_find_get(1, RCTX_S_UART_TX_PENDING, |
| 493 | RCTX_S_UART_TX_BUSY); |
| 494 | if (!ch->uart_tx_ctx) |
| 495 | return 0; |
| 496 | |
| 497 | /* start with index zero */ |
| 498 | ch->uart_tx_ctx->idx = 0; |
| 499 | |
| 500 | } |
| 501 | rctx = ch->uart_tx_ctx; |
| 502 | td = (struct cardemu_usb_msg_tx_data *) rctx->data; |
| 503 | |
| 504 | #if 0 |
| 505 | /* this must happen _after_ the byte has been transmittd */ |
| 506 | switch (ch->tpdu.state) { |
| 507 | case TPDU_S_WAIT_PB: |
| 508 | if (td->flags & CEMU_DATA_F_PB_AND_TX) |
| 509 | set_tpdu_state(ch, TPDU_S_WAIT_TX); |
| 510 | else if (td->flags & CEMU_DATA_F_PB_AND_RX) |
| 511 | set_tpdu_state(ch, TPDU_S_WAIT_RX); |
| 512 | break; |
| 513 | } |
| 514 | #endif |
| 515 | |
| 516 | /* take the next pending byte out of the rctx */ |
| 517 | *byte = td->data[rctx->idx++]; |
| 518 | |
| 519 | /* check if the buffer has now been fully transmitted */ |
| 520 | if ((rctx->idx >= td->hdr.data_len) || |
| 521 | (rctx->idx + sizeof(*td) - sizeof(td->hdr) >= rctx->tot_len)) { |
| 522 | req_ctx_set_state(rctx, RCTX_S_FREE); |
| 523 | ch->uart_tx_ctx = NULL; |
| 524 | /* FIXME: call into USB code to chec if we need to |
| 525 | * submit a free buffer to accept furthe data on bulk |
| 526 | * out endpoint */ |
| 527 | } |
| 528 | |
| 529 | return 1; |
| 530 | } |
| 531 | |
| 532 | /********************************************************************** |
| 533 | * Public API |
| 534 | **********************************************************************/ |
| 535 | |
| 536 | /* process a single byte received from the reader */ |
| 537 | void card_emu_process_rx_byte(struct card_handle *ch, uint8_t byte) |
| 538 | { |
| 539 | int new_state = -1; |
| 540 | |
| 541 | ch->stats.rx_bytes++; |
| 542 | |
| 543 | switch (ch->state) { |
| 544 | case ISO_S_WAIT_POWER: |
| 545 | case ISO_S_WAIT_CLK: |
| 546 | case ISO_S_WAIT_RST: |
| 547 | case ISO_S_WAIT_ATR: |
| 548 | /* we shouldn't receive any data from the reader yet! */ |
| 549 | break; |
| 550 | case ISO_S_WAIT_TPDU: |
| 551 | if (byte == 0xff) { |
| 552 | new_state = process_byte_pts(ch, byte); |
| 553 | ch->stats.pps++; |
| 554 | goto out_silent; |
| 555 | } |
| 556 | /* fall-through */ |
| 557 | case ISO_S_IN_TPDU: |
| 558 | new_state = process_byte_tpdu(ch, byte); |
| 559 | break; |
| 560 | case ISO_S_IN_PTS: |
| 561 | new_state = process_byte_pts(ch, byte); |
| 562 | goto out_silent; |
| 563 | } |
| 564 | |
| 565 | out_silent: |
| 566 | if (new_state != -1) |
| 567 | card_set_state(ch, new_state); |
| 568 | } |
| 569 | |
| 570 | /* return a single byte to be transmitted to the reader */ |
| 571 | int card_emu_get_tx_byte(struct card_handle *ch, uint8_t *byte) |
| 572 | { |
| 573 | int rc = 0; |
| 574 | |
| 575 | switch (ch->state) { |
| 576 | case ISO_S_IN_ATR: |
| 577 | if (ch->atr.idx < ch->atr.len) { |
| 578 | *byte = ch->atr.atr[ch->atr.idx++]; |
| 579 | rc = 1; |
| 580 | /* detect end of ATR */ |
| 581 | if (ch->atr.idx >= ch->atr.len) |
| 582 | card_set_state(ch, ISO_S_WAIT_TPDU); |
| 583 | } |
| 584 | break; |
| 585 | case ISO_S_IN_PTS: |
| 586 | rc = get_byte_pps(ch, byte); |
| 587 | break; |
| 588 | case ISO_S_IN_TPDU: |
| 589 | rc = get_byte_tpdu(ch, byte); |
| 590 | break; |
| 591 | } |
| 592 | |
| 593 | if (rc) |
| 594 | ch->stats.tx_bytes++; |
| 595 | |
| 596 | return rc; |
| 597 | } |
| 598 | |
| 599 | /* hardware driver informs us that a card I/O signal has changed */ |
| 600 | void card_emu_io_statechg(struct card_handle *ch, enum card_io io, int active) |
| 601 | { |
| 602 | switch (io) { |
| 603 | case CARD_IO_VCC: |
| 604 | if (active == 0) |
| 605 | card_set_state(ch, ISO_S_WAIT_POWER); |
| 606 | else if (active == 1 && ch->vcc_active == 0) |
| 607 | card_set_state(ch, ISO_S_WAIT_CLK); |
| 608 | ch->vcc_active = active; |
| 609 | break; |
| 610 | case CARD_IO_CLK: |
| 611 | if (active == 1 && ch->state == ISO_S_WAIT_CLK) |
| 612 | card_set_state(ch, ISO_S_WAIT_RST); |
| 613 | ch->clocked = active; |
| 614 | break; |
| 615 | case CARD_IO_RST: |
| 616 | if (active == 0 && ch->in_reset && |
| 617 | ch->vcc_active && ch->clocked) { |
| 618 | /* FIXME: wait 400 clocks */ |
| 619 | //card_set_state(ch, ISO_S_WAIT_ATR); |
| 620 | card_set_state(ch, ISO_S_IN_ATR); |
| 621 | } |
| 622 | ch->in_reset = active; |
| 623 | break; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | /* User sets a new ATR to be returned during next card reset */ |
| 628 | int card_emu_set_atr(struct card_handle *ch, const uint8_t *atr, uint8_t len) |
| 629 | { |
| 630 | if (len > sizeof(ch->atr.atr)) |
| 631 | return -1; |
| 632 | |
| 633 | memcpy(ch->atr.atr, atr, len); |
| 634 | ch->atr.len = len; |
| 635 | ch->atr.idx = 0; |
| 636 | |
| 637 | /* FIXME: race condition with trasmitting ATR to reader? */ |
| 638 | |
| 639 | return 0; |
| 640 | } |
| 641 | |
| 642 | /* hardware driver informs us that one (more) ETU has expired */ |
| 643 | void tc_etu_wtime_half_expired(void *handle) |
| 644 | { |
| 645 | struct card_handle *ch = handle; |
| 646 | /* transmit NULL procedure byte well before waiting time expires */ |
| 647 | card_emu_uart_tx(ch->uart_chan, ISO7816_3_PB_NULL); |
| 648 | } |
| 649 | |
| 650 | /* hardware driver informs us that one (more) ETU has expired */ |
| 651 | void tc_etu_wtime_expired(void *handle) |
| 652 | { |
| 653 | } |
| 654 | |
| 655 | /* shortest ATR found in smartcard_list.txt */ |
| 656 | static const uint8_t default_atr[] = { 0x3B, 0x02, 0x14, 0x50 }; |
| 657 | |
| 658 | static struct card_handle card_handles[NUM_SLOTS]; |
| 659 | |
| 660 | struct card_handle *card_emu_init(uint8_t slot_num, uint8_t tc_chan, uint8_t uart_chan) |
| 661 | { |
| 662 | struct card_handle *ch; |
| 663 | |
| 664 | if (slot_num >= ARRAY_SIZE(card_handles)) |
| 665 | return NULL; |
| 666 | |
| 667 | ch = &card_handles[slot_num]; |
| 668 | |
| 669 | memset(ch, 0, sizeof(*ch)); |
| 670 | |
| 671 | /* initialize the card_handle with reasonabe defaults */ |
| 672 | ch->state = ISO_S_WAIT_POWER; |
| 673 | ch->vcc_active = 0; |
| 674 | ch->in_reset = 1; |
| 675 | ch->clocked = 0; |
| 676 | |
| 677 | ch->fi = 0; |
| 678 | ch->di = 1; |
| 679 | ch->wi = ISO7816_3_DEFAULT_WI; |
| 680 | |
| 681 | ch->tc_chan = tc_chan; |
| 682 | ch->uart_chan = uart_chan; |
| 683 | ch->waiting_time = ISO7816_3_INIT_WTIME; |
| 684 | |
| 685 | ch->atr.idx = 0; |
| 686 | ch->atr.len = sizeof(default_atr); |
| 687 | memcpy(ch->atr.atr, default_atr, ch->atr.len); |
| 688 | |
| 689 | ch->pts.state = PTS_S_WAIT_REQ_PTSS; |
| 690 | ch->tpdu.state = TPDU_S_WAIT_CLA; |
| 691 | |
| 692 | tc_etu_init(ch->tc_chan, ch); |
| 693 | |
| 694 | return ch; |
| 695 | } |