Harald Welte | 1e90866 | 2010-03-07 23:39:54 +0100 | [diff] [blame] | 1 | /* GSM Mobile Radio Interface Layer 3 messages |
| 2 | * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ |
| 3 | |
| 4 | /* (C) 2008 by Harald Welte <laforge@gnumonks.org> |
| 5 | * (C) 2008-2010 by Andreas Eversberg |
| 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | |
| 26 | #include <stdint.h> |
| 27 | #include <string.h> |
| 28 | #include <errno.h> |
| 29 | |
| 30 | #include <osmocore/utils.h> |
| 31 | #include <osmocore/msgb.h> |
| 32 | #include <osmocore/tlv.h> |
| 33 | #include <osmocore/mncc.h> |
| 34 | #include <osmocore/protocol/gsm_04_08.h> |
| 35 | |
| 36 | static const char bcd_num_digits[] = { |
| 37 | '0', '1', '2', '3', '4', '5', '6', '7', |
| 38 | '8', '9', '*', '#', 'a', 'b', 'c', '\0' |
| 39 | }; |
| 40 | |
| 41 | /* decode a 'called/calling/connect party BCD number' as in 10.5.4.7 */ |
| 42 | int gsm48_decode_bcd_number(char *output, int output_len, |
| 43 | const uint8_t *bcd_lv, int h_len) |
| 44 | { |
| 45 | uint8_t in_len = bcd_lv[0]; |
| 46 | int i; |
| 47 | |
| 48 | for (i = 1 + h_len; i <= in_len; i++) { |
| 49 | /* lower nibble */ |
| 50 | output_len--; |
| 51 | if (output_len <= 1) |
| 52 | break; |
| 53 | *output++ = bcd_num_digits[bcd_lv[i] & 0xf]; |
| 54 | |
| 55 | /* higher nibble */ |
| 56 | output_len--; |
| 57 | if (output_len <= 1) |
| 58 | break; |
| 59 | *output++ = bcd_num_digits[bcd_lv[i] >> 4]; |
| 60 | } |
| 61 | if (output_len >= 1) |
| 62 | *output++ = '\0'; |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | /* convert a single ASCII character to call-control BCD */ |
| 68 | static int asc_to_bcd(const char asc) |
| 69 | { |
| 70 | int i; |
| 71 | |
| 72 | for (i = 0; i < ARRAY_SIZE(bcd_num_digits); i++) { |
| 73 | if (bcd_num_digits[i] == asc) |
| 74 | return i; |
| 75 | } |
| 76 | return -EINVAL; |
| 77 | } |
| 78 | |
| 79 | /* convert a ASCII phone number to 'called/calling/connect party BCD number' */ |
| 80 | int gsm48_encode_bcd_number(uint8_t *bcd_lv, uint8_t max_len, |
| 81 | int h_len, const char *input) |
| 82 | { |
| 83 | int in_len = strlen(input); |
| 84 | int i; |
| 85 | uint8_t *bcd_cur = bcd_lv + 1 + h_len; |
| 86 | |
| 87 | /* two digits per byte, plus type byte */ |
| 88 | bcd_lv[0] = in_len/2 + h_len; |
| 89 | if (in_len % 2) |
| 90 | bcd_lv[0]++; |
| 91 | |
| 92 | if (bcd_lv[0] > max_len) |
| 93 | return -EIO; |
| 94 | |
| 95 | for (i = 0; i < in_len; i++) { |
| 96 | int rc = asc_to_bcd(input[i]); |
| 97 | if (rc < 0) |
| 98 | return rc; |
| 99 | if (i % 2 == 0) |
| 100 | *bcd_cur = rc; |
| 101 | else |
| 102 | *bcd_cur++ |= (rc << 4); |
| 103 | } |
| 104 | /* append padding nibble in case of odd length */ |
| 105 | if (i % 2) |
| 106 | *bcd_cur++ |= 0xf0; |
| 107 | |
| 108 | /* return how many bytes we used */ |
| 109 | return (bcd_cur - bcd_lv); |
| 110 | } |
| 111 | |
| 112 | /* decode 'bearer capability' */ |
| 113 | int gsm48_decode_bearer_cap(struct gsm_mncc_bearer_cap *bcap, |
| 114 | const uint8_t *lv) |
| 115 | { |
| 116 | uint8_t in_len = lv[0]; |
| 117 | int i, s; |
| 118 | |
| 119 | if (in_len < 1) |
| 120 | return -EINVAL; |
| 121 | |
| 122 | bcap->speech_ver[0] = -1; /* end of list, of maximum 7 values */ |
| 123 | |
| 124 | /* octet 3 */ |
| 125 | bcap->transfer = lv[1] & 0x07; |
| 126 | bcap->mode = (lv[1] & 0x08) >> 3; |
| 127 | bcap->coding = (lv[1] & 0x10) >> 4; |
| 128 | bcap->radio = (lv[1] & 0x60) >> 5; |
| 129 | |
| 130 | if (bcap->transfer == GSM_MNCC_BCAP_SPEECH) { |
| 131 | i = 1; |
| 132 | s = 0; |
| 133 | while(!(lv[i] & 0x80)) { |
| 134 | i++; /* octet 3a etc */ |
| 135 | if (in_len < i) |
| 136 | return 0; |
| 137 | bcap->speech_ver[s++] = lv[i] & 0x0f; |
| 138 | bcap->speech_ver[s] = -1; /* end of list */ |
| 139 | if (i == 2) /* octet 3a */ |
| 140 | bcap->speech_ctm = (lv[i] & 0x20) >> 5; |
| 141 | if (s == 7) /* maximum speech versions + end of list */ |
| 142 | return 0; |
| 143 | } |
| 144 | } else { |
| 145 | i = 1; |
| 146 | while (!(lv[i] & 0x80)) { |
| 147 | i++; /* octet 3a etc */ |
| 148 | if (in_len < i) |
| 149 | return 0; |
| 150 | /* ignore them */ |
| 151 | } |
| 152 | /* FIXME: implement OCTET 4+ parsing */ |
| 153 | } |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | /* encode 'bearer capability' */ |
| 159 | int gsm48_encode_bearer_cap(struct msgb *msg, int lv_only, |
| 160 | const struct gsm_mncc_bearer_cap *bcap) |
| 161 | { |
| 162 | uint8_t lv[32 + 1]; |
| 163 | int i = 1, s; |
| 164 | |
| 165 | lv[1] = bcap->transfer; |
| 166 | lv[1] |= bcap->mode << 3; |
| 167 | lv[1] |= bcap->coding << 4; |
| 168 | lv[1] |= bcap->radio << 5; |
| 169 | |
| 170 | if (bcap->transfer == GSM_MNCC_BCAP_SPEECH) { |
| 171 | for (s = 0; bcap->speech_ver[s] >= 0; s++) { |
| 172 | i++; /* octet 3a etc */ |
| 173 | lv[i] = bcap->speech_ver[s]; |
| 174 | if (i == 2) /* octet 3a */ |
| 175 | lv[i] |= bcap->speech_ctm << 5; |
| 176 | } |
| 177 | lv[i] |= 0x80; /* last IE of octet 3 etc */ |
| 178 | } else { |
| 179 | /* FIXME: implement OCTET 4+ encoding */ |
| 180 | } |
| 181 | |
| 182 | lv[0] = i; |
| 183 | if (lv_only) |
| 184 | msgb_lv_put(msg, lv[0], lv+1); |
| 185 | else |
| 186 | msgb_tlv_put(msg, GSM48_IE_BEARER_CAP, lv[0], lv+1); |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | /* decode 'call control cap' */ |
| 192 | int gsm48_decode_cccap(struct gsm_mncc_cccap *ccap, const uint8_t *lv) |
| 193 | { |
| 194 | uint8_t in_len = lv[0]; |
| 195 | |
| 196 | if (in_len < 1) |
| 197 | return -EINVAL; |
| 198 | |
| 199 | /* octet 3 */ |
| 200 | ccap->dtmf = lv[1] & 0x01; |
| 201 | ccap->pcp = (lv[1] & 0x02) >> 1; |
| 202 | |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | /* encode 'call control cap' */ |
| 207 | int gsm48_encode_cccap(struct msgb *msg, |
| 208 | const struct gsm_mncc_cccap *ccap) |
| 209 | { |
| 210 | uint8_t lv[2]; |
| 211 | |
| 212 | lv[0] = 1; |
| 213 | lv[1] = 0; |
| 214 | if (ccap->dtmf) |
| 215 | lv [1] |= 0x01; |
| 216 | if (ccap->pcp) |
| 217 | lv [1] |= 0x02; |
| 218 | |
| 219 | msgb_tlv_put(msg, GSM48_IE_CC_CAP, lv[0], lv+1); |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | /* decode 'called party BCD number' */ |
| 225 | int gsm48_decode_called(struct gsm_mncc_number *called, |
| 226 | const uint8_t *lv) |
| 227 | { |
| 228 | uint8_t in_len = lv[0]; |
| 229 | |
| 230 | if (in_len < 1) |
| 231 | return -EINVAL; |
| 232 | |
| 233 | /* octet 3 */ |
| 234 | called->plan = lv[1] & 0x0f; |
| 235 | called->type = (lv[1] & 0x70) >> 4; |
| 236 | |
| 237 | /* octet 4..N */ |
| 238 | gsm48_decode_bcd_number(called->number, sizeof(called->number), lv, 1); |
| 239 | |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | /* encode 'called party BCD number' */ |
| 244 | int gsm48_encode_called(struct msgb *msg, |
| 245 | const struct gsm_mncc_number *called) |
| 246 | { |
| 247 | uint8_t lv[18]; |
| 248 | int ret; |
| 249 | |
| 250 | /* octet 3 */ |
| 251 | lv[1] = called->plan; |
| 252 | lv[1] |= called->type << 4; |
| 253 | |
| 254 | /* octet 4..N, octet 2 */ |
| 255 | ret = gsm48_encode_bcd_number(lv, sizeof(lv), 1, called->number); |
| 256 | if (ret < 0) |
| 257 | return ret; |
| 258 | |
| 259 | msgb_tlv_put(msg, GSM48_IE_CALLED_BCD, lv[0], lv+1); |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | /* decode callerid of various IEs */ |
| 265 | int gsm48_decode_callerid(struct gsm_mncc_number *callerid, |
| 266 | const uint8_t *lv) |
| 267 | { |
| 268 | uint8_t in_len = lv[0]; |
| 269 | int i = 1; |
| 270 | |
| 271 | if (in_len < 1) |
| 272 | return -EINVAL; |
| 273 | |
| 274 | /* octet 3 */ |
| 275 | callerid->plan = lv[1] & 0x0f; |
| 276 | callerid->type = (lv[1] & 0x70) >> 4; |
| 277 | |
| 278 | /* octet 3a */ |
| 279 | if (!(lv[1] & 0x80)) { |
| 280 | callerid->screen = lv[2] & 0x03; |
| 281 | callerid->present = (lv[2] & 0x60) >> 5; |
| 282 | i = 2; |
| 283 | } |
| 284 | |
| 285 | /* octet 4..N */ |
| 286 | gsm48_decode_bcd_number(callerid->number, sizeof(callerid->number), lv, i); |
| 287 | |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | /* encode callerid of various IEs */ |
| 292 | int gsm48_encode_callerid(struct msgb *msg, int ie, int max_len, |
| 293 | const struct gsm_mncc_number *callerid) |
| 294 | { |
| 295 | uint8_t lv[max_len - 1]; |
| 296 | int h_len = 1; |
| 297 | int ret; |
| 298 | |
| 299 | /* octet 3 */ |
| 300 | lv[1] = callerid->plan; |
| 301 | lv[1] |= callerid->type << 4; |
| 302 | |
| 303 | if (callerid->present || callerid->screen) { |
| 304 | /* octet 3a */ |
| 305 | lv[2] = callerid->screen; |
| 306 | lv[2] |= callerid->present << 5; |
| 307 | lv[2] |= 0x80; |
| 308 | h_len++; |
| 309 | } else |
| 310 | lv[1] |= 0x80; |
| 311 | |
| 312 | /* octet 4..N, octet 2 */ |
| 313 | ret = gsm48_encode_bcd_number(lv, sizeof(lv), h_len, callerid->number); |
| 314 | if (ret < 0) |
| 315 | return ret; |
| 316 | |
| 317 | msgb_tlv_put(msg, ie, lv[0], lv+1); |
| 318 | |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | /* decode 'cause' */ |
| 323 | int gsm48_decode_cause(struct gsm_mncc_cause *cause, |
| 324 | const uint8_t *lv) |
| 325 | { |
| 326 | uint8_t in_len = lv[0]; |
| 327 | int i; |
| 328 | |
| 329 | if (in_len < 2) |
| 330 | return -EINVAL; |
| 331 | |
| 332 | cause->diag_len = 0; |
| 333 | |
| 334 | /* octet 3 */ |
| 335 | cause->location = lv[1] & 0x0f; |
| 336 | cause->coding = (lv[1] & 0x60) >> 5; |
| 337 | |
| 338 | i = 1; |
| 339 | if (!(lv[i] & 0x80)) { |
| 340 | i++; /* octet 3a */ |
| 341 | if (in_len < i+1) |
| 342 | return 0; |
| 343 | cause->rec = 1; |
| 344 | cause->rec_val = lv[i] & 0x7f; |
| 345 | } |
| 346 | i++; |
| 347 | |
| 348 | /* octet 4 */ |
| 349 | cause->value = lv[i] & 0x7f; |
| 350 | i++; |
| 351 | |
| 352 | if (in_len < i) /* no diag */ |
| 353 | return 0; |
| 354 | |
| 355 | if (in_len - (i-1) > 32) /* maximum 32 octets */ |
| 356 | return 0; |
| 357 | |
| 358 | /* octet 5-N */ |
| 359 | memcpy(cause->diag, lv + i, in_len - (i-1)); |
| 360 | cause->diag_len = in_len - (i-1); |
| 361 | |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | /* encode 'cause' */ |
| 366 | int gsm48_encode_cause(struct msgb *msg, int lv_only, |
| 367 | const struct gsm_mncc_cause *cause) |
| 368 | { |
| 369 | uint8_t lv[32+4]; |
| 370 | int i; |
| 371 | |
| 372 | if (cause->diag_len > 32) |
| 373 | return -EINVAL; |
| 374 | |
| 375 | /* octet 3 */ |
| 376 | lv[1] = cause->location; |
| 377 | lv[1] |= cause->coding << 5; |
| 378 | |
| 379 | i = 1; |
| 380 | if (cause->rec) { |
| 381 | i++; /* octet 3a */ |
| 382 | lv[i] = cause->rec_val; |
| 383 | } |
| 384 | lv[i] |= 0x80; /* end of octet 3 */ |
| 385 | |
| 386 | /* octet 4 */ |
| 387 | i++; |
| 388 | lv[i] = 0x80 | cause->value; |
| 389 | |
| 390 | /* octet 5-N */ |
| 391 | if (cause->diag_len) { |
| 392 | memcpy(lv + i, cause->diag, cause->diag_len); |
| 393 | i += cause->diag_len; |
| 394 | } |
| 395 | |
| 396 | lv[0] = i; |
| 397 | if (lv_only) |
| 398 | msgb_lv_put(msg, lv[0], lv+1); |
| 399 | else |
| 400 | msgb_tlv_put(msg, GSM48_IE_CAUSE, lv[0], lv+1); |
| 401 | |
| 402 | return 0; |
| 403 | } |
| 404 | |
| 405 | /* decode 'calling number' */ |
| 406 | int gsm48_decode_calling(struct gsm_mncc_number *calling, |
| 407 | const uint8_t *lv) |
| 408 | { |
| 409 | return gsm48_decode_callerid(calling, lv); |
| 410 | } |
| 411 | |
| 412 | /* encode 'calling number' */ |
| 413 | int gsm48_encode_calling(struct msgb *msg, |
| 414 | const struct gsm_mncc_number *calling) |
| 415 | { |
| 416 | return gsm48_encode_callerid(msg, GSM48_IE_CALLING_BCD, 14, calling); |
| 417 | } |
| 418 | |
| 419 | /* decode 'connected number' */ |
| 420 | int gsm48_decode_connected(struct gsm_mncc_number *connected, |
| 421 | const uint8_t *lv) |
| 422 | { |
| 423 | return gsm48_decode_callerid(connected, lv); |
| 424 | } |
| 425 | |
| 426 | /* encode 'connected number' */ |
| 427 | int gsm48_encode_connected(struct msgb *msg, |
| 428 | const struct gsm_mncc_number *connected) |
| 429 | { |
| 430 | return gsm48_encode_callerid(msg, GSM48_IE_CONN_BCD, 14, connected); |
| 431 | } |
| 432 | |
| 433 | /* decode 'redirecting number' */ |
| 434 | int gsm48_decode_redirecting(struct gsm_mncc_number *redirecting, |
| 435 | const uint8_t *lv) |
| 436 | { |
| 437 | return gsm48_decode_callerid(redirecting, lv); |
| 438 | } |
| 439 | |
| 440 | /* encode 'redirecting number' */ |
| 441 | int gsm48_encode_redirecting(struct msgb *msg, |
| 442 | const struct gsm_mncc_number *redirecting) |
| 443 | { |
| 444 | return gsm48_encode_callerid(msg, GSM48_IE_REDIR_BCD, 19, redirecting); |
| 445 | } |
| 446 | |
| 447 | /* decode 'facility' */ |
| 448 | int gsm48_decode_facility(struct gsm_mncc_facility *facility, |
| 449 | const uint8_t *lv) |
| 450 | { |
| 451 | uint8_t in_len = lv[0]; |
| 452 | |
| 453 | if (in_len < 1) |
| 454 | return -EINVAL; |
| 455 | |
| 456 | if (in_len > sizeof(facility->info)) |
| 457 | return -EINVAL; |
| 458 | |
| 459 | memcpy(facility->info, lv+1, in_len); |
| 460 | facility->len = in_len; |
| 461 | |
| 462 | return 0; |
| 463 | } |
| 464 | |
| 465 | /* encode 'facility' */ |
| 466 | int gsm48_encode_facility(struct msgb *msg, int lv_only, |
| 467 | const struct gsm_mncc_facility *facility) |
| 468 | { |
| 469 | uint8_t lv[GSM_MAX_FACILITY + 1]; |
| 470 | |
| 471 | if (facility->len < 1 || facility->len > GSM_MAX_FACILITY) |
| 472 | return -EINVAL; |
| 473 | |
| 474 | memcpy(lv+1, facility->info, facility->len); |
| 475 | lv[0] = facility->len; |
| 476 | if (lv_only) |
| 477 | msgb_lv_put(msg, lv[0], lv+1); |
| 478 | else |
| 479 | msgb_tlv_put(msg, GSM48_IE_FACILITY, lv[0], lv+1); |
| 480 | |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | /* decode 'notify' */ |
| 485 | int gsm48_decode_notify(int *notify, const uint8_t *v) |
| 486 | { |
| 487 | *notify = v[0] & 0x7f; |
| 488 | |
| 489 | return 0; |
| 490 | } |
| 491 | |
| 492 | /* encode 'notify' */ |
| 493 | int gsm48_encode_notify(struct msgb *msg, int notify) |
| 494 | { |
| 495 | msgb_v_put(msg, notify | 0x80); |
| 496 | |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | /* decode 'signal' */ |
| 501 | int gsm48_decode_signal(int *signal, const uint8_t *v) |
| 502 | { |
| 503 | *signal = v[0]; |
| 504 | |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | /* encode 'signal' */ |
| 509 | int gsm48_encode_signal(struct msgb *msg, int signal) |
| 510 | { |
| 511 | msgb_tv_put(msg, GSM48_IE_SIGNAL, signal); |
| 512 | |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | /* decode 'keypad' */ |
| 517 | int gsm48_decode_keypad(int *keypad, const uint8_t *lv) |
| 518 | { |
| 519 | uint8_t in_len = lv[0]; |
| 520 | |
| 521 | if (in_len < 1) |
| 522 | return -EINVAL; |
| 523 | |
| 524 | *keypad = lv[1] & 0x7f; |
| 525 | |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | /* encode 'keypad' */ |
| 530 | int gsm48_encode_keypad(struct msgb *msg, int keypad) |
| 531 | { |
| 532 | msgb_tv_put(msg, GSM48_IE_KPD_FACILITY, keypad); |
| 533 | |
| 534 | return 0; |
| 535 | } |
| 536 | |
| 537 | /* decode 'progress' */ |
| 538 | int gsm48_decode_progress(struct gsm_mncc_progress *progress, |
| 539 | const uint8_t *lv) |
| 540 | { |
| 541 | uint8_t in_len = lv[0]; |
| 542 | |
| 543 | if (in_len < 2) |
| 544 | return -EINVAL; |
| 545 | |
| 546 | progress->coding = (lv[1] & 0x60) >> 5; |
| 547 | progress->location = lv[1] & 0x0f; |
| 548 | progress->descr = lv[2] & 0x7f; |
| 549 | |
| 550 | return 0; |
| 551 | } |
| 552 | |
| 553 | /* encode 'progress' */ |
| 554 | int gsm48_encode_progress(struct msgb *msg, int lv_only, |
| 555 | const struct gsm_mncc_progress *p) |
| 556 | { |
| 557 | uint8_t lv[3]; |
| 558 | |
| 559 | lv[0] = 2; |
| 560 | lv[1] = 0x80 | ((p->coding & 0x3) << 5) | (p->location & 0xf); |
| 561 | lv[2] = 0x80 | (p->descr & 0x7f); |
| 562 | if (lv_only) |
| 563 | msgb_lv_put(msg, lv[0], lv+1); |
| 564 | else |
| 565 | msgb_tlv_put(msg, GSM48_IE_PROGR_IND, lv[0], lv+1); |
| 566 | |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | /* decode 'user-user' */ |
| 571 | int gsm48_decode_useruser(struct gsm_mncc_useruser *uu, |
| 572 | const uint8_t *lv) |
| 573 | { |
| 574 | uint8_t in_len = lv[0]; |
| 575 | char *info = uu->info; |
| 576 | int info_len = sizeof(uu->info); |
| 577 | int i; |
| 578 | |
| 579 | if (in_len < 1) |
| 580 | return -EINVAL; |
| 581 | |
| 582 | uu->proto = lv[1]; |
| 583 | |
| 584 | for (i = 2; i <= in_len; i++) { |
| 585 | info_len--; |
| 586 | if (info_len <= 1) |
| 587 | break; |
| 588 | *info++ = lv[i]; |
| 589 | } |
| 590 | if (info_len >= 1) |
| 591 | *info++ = '\0'; |
| 592 | |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | /* encode 'useruser' */ |
| 597 | int gsm48_encode_useruser(struct msgb *msg, int lv_only, |
| 598 | const struct gsm_mncc_useruser *uu) |
| 599 | { |
| 600 | uint8_t lv[GSM_MAX_USERUSER + 2]; |
| 601 | |
| 602 | if (strlen(uu->info) > GSM_MAX_USERUSER) |
| 603 | return -EINVAL; |
| 604 | |
| 605 | lv[0] = 1 + strlen(uu->info); |
| 606 | lv[1] = uu->proto; |
| 607 | memcpy(lv + 2, uu->info, strlen(uu->info)); |
| 608 | if (lv_only) |
| 609 | msgb_lv_put(msg, lv[0], lv+1); |
| 610 | else |
| 611 | msgb_tlv_put(msg, GSM48_IE_USER_USER, lv[0], lv+1); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | /* decode 'ss version' */ |
| 617 | int gsm48_decode_ssversion(struct gsm_mncc_ssversion *ssv, |
| 618 | const uint8_t *lv) |
| 619 | { |
| 620 | uint8_t in_len = lv[0]; |
| 621 | |
| 622 | if (in_len < 1 || in_len < sizeof(ssv->info)) |
| 623 | return -EINVAL; |
| 624 | |
| 625 | memcpy(ssv->info, lv + 1, in_len); |
| 626 | ssv->len = in_len; |
| 627 | |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | /* encode 'ss version' */ |
| 632 | int gsm48_encode_ssversion(struct msgb *msg, |
| 633 | const struct gsm_mncc_ssversion *ssv) |
| 634 | { |
| 635 | uint8_t lv[GSM_MAX_SSVERSION + 1]; |
| 636 | |
| 637 | if (ssv->len > GSM_MAX_SSVERSION) |
| 638 | return -EINVAL; |
| 639 | |
| 640 | lv[0] = ssv->len; |
| 641 | memcpy(lv + 1, ssv->info, ssv->len); |
| 642 | msgb_tlv_put(msg, GSM48_IE_SS_VERS, lv[0], lv+1); |
| 643 | |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | /* decode 'more data' does not require a function, because it has no value */ |
| 648 | |
| 649 | /* encode 'more data' */ |
| 650 | int gsm48_encode_more(struct msgb *msg) |
| 651 | { |
| 652 | uint8_t *ie; |
| 653 | |
| 654 | ie = msgb_put(msg, 1); |
| 655 | ie[0] = GSM48_IE_MORE_DATA; |
| 656 | |
| 657 | return 0; |
| 658 | } |
| 659 | |