Philipp Maier | 2240143 | 2017-03-24 17:59:26 +0100 | [diff] [blame] | 1 | /* (C) 2016 by Sysmocom s.f.m.c. GmbH |
| 2 | * All Rights Reserved |
| 3 | * |
| 4 | * Author: Philipp Maier |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU Affero General Public License as published by |
| 8 | * the Free Software Foundation; either version 3 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU Affero General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Affero General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | * |
| 19 | */ |
| 20 | |
Harald Welte | 20725b9 | 2017-05-15 12:50:04 +0200 | [diff] [blame] | 21 | #include "config.h" |
| 22 | |
Philipp Maier | 2240143 | 2017-03-24 17:59:26 +0100 | [diff] [blame] | 23 | #include <osmocom/core/utils.h> |
| 24 | #include <osmocom/core/msgb.h> |
Harald Welte | 95871da | 2017-05-15 12:11:36 +0200 | [diff] [blame] | 25 | #include <osmocom/core/byteswap.h> |
Philipp Maier | 2240143 | 2017-03-24 17:59:26 +0100 | [diff] [blame] | 26 | #include <string.h> |
Philipp Maier | 2240143 | 2017-03-24 17:59:26 +0100 | [diff] [blame] | 27 | #include <errno.h> |
| 28 | #include <osmocom/gsm/protocol/gsm_08_08.h> |
| 29 | |
| 30 | #define IP_V4_ADDR_LEN 4 |
| 31 | #define IP_V6_ADDR_LEN 16 |
| 32 | #define IP_PORT_LEN 2 |
| 33 | |
Philipp Maier | e0c6530 | 2017-03-28 17:05:40 +0200 | [diff] [blame] | 34 | #define CHANNEL_TYPE_ELEMENT_MAXLEN 11 |
| 35 | #define CHANNEL_TYPE_ELEMENT_MINLEN 3 |
Philipp Maier | 14e76b9 | 2017-03-28 18:36:52 +0200 | [diff] [blame] | 36 | #define ENCRYPT_INFO_ELEMENT_MINLEN 1 |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 37 | |
Harald Welte | 20725b9 | 2017-05-15 12:50:04 +0200 | [diff] [blame] | 38 | #ifdef HAVE_SYS_SOCKET_H |
| 39 | |
| 40 | #include <sys/socket.h> |
| 41 | #include <netinet/in.h> |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 42 | |
| 43 | /*! \addtogroup gsm0808 |
| 44 | * @{ |
| 45 | */ |
| 46 | |
| 47 | /*! \brief Encode TS 08.08 AoIP transport address IE |
| 48 | * \param[out] msg Message Buffer to which to append IE |
| 49 | * \param[in] ss Socket Address to be used in IE |
| 50 | * \returns number of bytes added to \a msg */ |
Philipp Maier | 2240143 | 2017-03-24 17:59:26 +0100 | [diff] [blame] | 51 | uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg, |
| 52 | const struct sockaddr_storage *ss) |
| 53 | { |
| 54 | /* See also 3GPP TS 48.008 3.2.2.102 AoIP Transport Layer Address */ |
| 55 | struct sockaddr_in *sin; |
| 56 | struct sockaddr_in6 *sin6; |
| 57 | uint16_t port = 0; |
| 58 | uint8_t *ptr; |
| 59 | uint8_t *old_tail; |
| 60 | uint8_t *tlv_len; |
| 61 | |
| 62 | OSMO_ASSERT(msg); |
| 63 | OSMO_ASSERT(ss); |
| 64 | OSMO_ASSERT(ss->ss_family == AF_INET || ss->ss_family == AF_INET6); |
| 65 | |
| 66 | msgb_put_u8(msg, GSM0808_IE_AOIP_TRASP_ADDR); |
| 67 | tlv_len = msgb_put(msg,1); |
| 68 | old_tail = msg->tail; |
| 69 | |
| 70 | switch (ss->ss_family) { |
| 71 | case AF_INET: |
| 72 | sin = (struct sockaddr_in *)ss; |
Harald Welte | 95871da | 2017-05-15 12:11:36 +0200 | [diff] [blame] | 73 | port = osmo_ntohs(sin->sin_port); |
Philipp Maier | 2240143 | 2017-03-24 17:59:26 +0100 | [diff] [blame] | 74 | ptr = msgb_put(msg, IP_V4_ADDR_LEN); |
| 75 | memcpy(ptr, &sin->sin_addr.s_addr, IP_V4_ADDR_LEN); |
| 76 | break; |
| 77 | case AF_INET6: |
| 78 | sin6 = (struct sockaddr_in6 *)ss; |
Harald Welte | 95871da | 2017-05-15 12:11:36 +0200 | [diff] [blame] | 79 | port = osmo_ntohs(sin6->sin6_port); |
Philipp Maier | 2240143 | 2017-03-24 17:59:26 +0100 | [diff] [blame] | 80 | ptr = msgb_put(msg, IP_V6_ADDR_LEN); |
| 81 | memcpy(ptr, sin6->sin6_addr.s6_addr, IP_V6_ADDR_LEN); |
| 82 | break; |
| 83 | } |
| 84 | |
| 85 | msgb_put_u16(msg, port); |
| 86 | |
| 87 | *tlv_len = (uint8_t) (msg->tail - old_tail); |
| 88 | return *tlv_len + 2; |
| 89 | } |
| 90 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 91 | /*! \brief Decode TS 08.08 AoIP transport address IE |
| 92 | * \param[out] ss Caller-provided memory where decoded socket addr is stored |
| 93 | * \param[in] elem pointer to IE value |
| 94 | * \param[in] len length of \a elem in bytes |
| 95 | * \returns number of bytes parsed */ |
Philipp Maier | 2240143 | 2017-03-24 17:59:26 +0100 | [diff] [blame] | 96 | int gsm0808_dec_aoip_trasp_addr(struct sockaddr_storage *ss, |
| 97 | const uint8_t *elem, uint8_t len) |
| 98 | { |
| 99 | /* See also 3GPP TS 48.008 3.2.2.102 AoIP Transport Layer Address */ |
| 100 | struct sockaddr_in sin; |
| 101 | struct sockaddr_in6 sin6; |
| 102 | const uint8_t *old_elem = elem; |
| 103 | |
| 104 | OSMO_ASSERT(ss); |
| 105 | if (!elem) |
| 106 | return -EINVAL; |
| 107 | if (len <= 0) |
| 108 | return -EINVAL; |
| 109 | |
| 110 | memset(ss, 0, sizeof(*ss)); |
| 111 | |
| 112 | switch (len) { |
| 113 | case IP_V4_ADDR_LEN + IP_PORT_LEN: |
| 114 | memset(&sin, 0, sizeof(sin)); |
| 115 | sin.sin_family = AF_INET; |
| 116 | |
| 117 | memcpy(&sin.sin_addr.s_addr, elem, IP_V4_ADDR_LEN); |
| 118 | elem += IP_V4_ADDR_LEN; |
| 119 | sin.sin_port = osmo_load16le(elem); |
| 120 | elem += IP_PORT_LEN; |
| 121 | |
| 122 | memcpy(ss, &sin, sizeof(sin)); |
| 123 | break; |
| 124 | case IP_V6_ADDR_LEN + IP_PORT_LEN: |
| 125 | memset(&sin6, 0, sizeof(sin6)); |
| 126 | sin6.sin6_family = AF_INET6; |
| 127 | |
| 128 | memcpy(sin6.sin6_addr.s6_addr, elem, IP_V6_ADDR_LEN); |
| 129 | elem += IP_V6_ADDR_LEN; |
| 130 | sin6.sin6_port = osmo_load16le(elem); |
| 131 | elem += IP_PORT_LEN; |
| 132 | |
| 133 | memcpy(ss, &sin6, sizeof(sin6)); |
| 134 | break; |
| 135 | default: |
| 136 | /* Malformed element! */ |
| 137 | return -EINVAL; |
| 138 | break; |
| 139 | } |
| 140 | |
| 141 | return (int)(elem - old_elem); |
| 142 | } |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 143 | |
Harald Welte | 20725b9 | 2017-05-15 12:50:04 +0200 | [diff] [blame] | 144 | #endif /* HAVE_SYS_SOCKET_H */ |
| 145 | |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 146 | /* Helper function for gsm0808_enc_speech_codec() |
| 147 | * and gsm0808_enc_speech_codec_list() */ |
| 148 | static uint8_t enc_speech_codec(struct msgb *msg, |
| 149 | const struct gsm0808_speech_codec *sc) |
| 150 | { |
| 151 | /* See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */ |
| 152 | uint8_t header = 0; |
| 153 | uint8_t *old_tail; |
| 154 | |
| 155 | old_tail = msg->tail; |
| 156 | |
| 157 | if (sc->fi) |
| 158 | header |= (1 << 7); |
| 159 | if (sc->pi) |
| 160 | header |= (1 << 6); |
| 161 | if (sc->pt) |
| 162 | header |= (1 << 5); |
| 163 | if (sc->tf) |
| 164 | header |= (1 << 4); |
| 165 | if (sc->type_extended) { |
| 166 | header |= 0x0f; |
| 167 | msgb_put_u8(msg, header); |
| 168 | } else { |
| 169 | OSMO_ASSERT(sc->type < 0x0f); |
| 170 | header |= sc->type; |
| 171 | msgb_put_u8(msg, header); |
| 172 | return (uint8_t) (msg->tail - old_tail); |
| 173 | } |
| 174 | |
| 175 | msgb_put_u8(msg, sc->type); |
| 176 | |
| 177 | if (sc->cfg_present) |
| 178 | msgb_put_u16(msg, sc->cfg); |
| 179 | |
| 180 | return (uint8_t) (msg->tail - old_tail); |
| 181 | } |
| 182 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 183 | /*! \brief Encode TS 08.08 Speech Codec IE |
| 184 | * \param[out] msg Message Buffer to which IE will be appended |
| 185 | * \param[in] sc Speech Codec to be encoded into IE |
| 186 | * \returns number of bytes appended to \a msg */ |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 187 | uint8_t gsm0808_enc_speech_codec(struct msgb *msg, |
| 188 | const struct gsm0808_speech_codec *sc) |
| 189 | { |
| 190 | uint8_t *old_tail; |
| 191 | uint8_t *tlv_len; |
| 192 | |
| 193 | OSMO_ASSERT(msg); |
| 194 | OSMO_ASSERT(sc); |
| 195 | |
| 196 | msgb_put_u8(msg, GSM0808_IE_SPEECH_CODEC); |
| 197 | tlv_len = msgb_put(msg, 1); |
| 198 | old_tail = msg->tail; |
| 199 | |
| 200 | enc_speech_codec(msg, sc); |
| 201 | |
| 202 | *tlv_len = (uint8_t) (msg->tail - old_tail); |
| 203 | return *tlv_len + 2; |
| 204 | } |
| 205 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 206 | /*! \brief Decode TS 08.08 Speech Codec IE |
| 207 | * \param[out] sc Caller-allocated memory for Speech Codec |
| 208 | * \param[in] elem IE value to be decoded |
| 209 | * \param[in] len Length of \a elem in bytes |
| 210 | * \returns number of bytes parsed; negative on error */ |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 211 | int gsm0808_dec_speech_codec(struct gsm0808_speech_codec *sc, |
| 212 | const uint8_t *elem, uint8_t len) |
| 213 | { |
| 214 | /* See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */ |
| 215 | uint8_t header; |
| 216 | const uint8_t *old_elem = elem; |
| 217 | |
| 218 | OSMO_ASSERT(sc); |
| 219 | if (!elem) |
| 220 | return -EINVAL; |
| 221 | if (len <= 0) |
| 222 | return -EINVAL; |
| 223 | |
| 224 | memset(sc, 0, sizeof(*sc)); |
| 225 | |
| 226 | header = *elem; |
| 227 | |
Philipp Maier | 85a6af2 | 2017-04-28 10:55:05 +0200 | [diff] [blame] | 228 | /* An extended codec type needs at least two fields, |
| 229 | * bail if the input data length is not sufficient. */ |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 230 | if ((header & 0x0F) == 0x0F && len < 2) |
| 231 | return -EINVAL; |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 232 | |
| 233 | elem++; |
| 234 | len--; |
| 235 | |
| 236 | if (header & (1 << 7)) |
| 237 | sc->fi = true; |
| 238 | if (header & (1 << 6)) |
| 239 | sc->pi = true; |
| 240 | if (header & (1 << 5)) |
| 241 | sc->pt = true; |
| 242 | if (header & (1 << 4)) |
| 243 | sc->tf = true; |
| 244 | |
| 245 | if ((header & 0x0F) != 0x0F) { |
| 246 | sc->type = (header & 0x0F); |
| 247 | return (int)(elem - old_elem); |
| 248 | } |
| 249 | |
| 250 | sc->type = *elem; |
| 251 | elem++; |
| 252 | len--; |
| 253 | |
| 254 | sc->type_extended = true; |
| 255 | |
| 256 | if (len < 2) |
| 257 | return (int)(elem - old_elem); |
| 258 | |
| 259 | sc->cfg = osmo_load16be(elem); |
| 260 | elem += 2; |
| 261 | sc->cfg_present = true; |
| 262 | |
| 263 | return (int)(elem - old_elem); |
| 264 | } |
| 265 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 266 | /*! \brief Encode TS 08.08 Speech Codec list |
| 267 | * \param[out] msg Message Buffer to which IE is to be appended |
| 268 | * \param[in] scl Speech Codec List to be encoded into IE |
| 269 | * \returns number of bytes added to \a msg */ |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 270 | uint8_t gsm0808_enc_speech_codec_list(struct msgb *msg, |
| 271 | const struct gsm0808_speech_codec_list *scl) |
| 272 | { |
| 273 | uint8_t *old_tail; |
| 274 | uint8_t *tlv_len; |
| 275 | unsigned int i; |
| 276 | uint8_t rc; |
| 277 | unsigned int bytes_used = 0; |
| 278 | |
| 279 | OSMO_ASSERT(msg); |
| 280 | OSMO_ASSERT(scl); |
| 281 | |
| 282 | /* Empty list */ |
| 283 | OSMO_ASSERT(scl->len >= 1); |
| 284 | |
| 285 | msgb_put_u8(msg, GSM0808_IE_SPEECH_CODEC_LIST); |
| 286 | tlv_len = msgb_put(msg, 1); |
| 287 | old_tail = msg->tail; |
| 288 | |
| 289 | for (i = 0; i < scl->len; i++) { |
| 290 | rc = enc_speech_codec(msg, &scl->codec[i]); |
| 291 | OSMO_ASSERT(rc >= 1); |
| 292 | bytes_used += rc; |
| 293 | OSMO_ASSERT(bytes_used <= 255); |
| 294 | } |
| 295 | |
| 296 | *tlv_len = (uint8_t) (msg->tail - old_tail); |
| 297 | return *tlv_len + 2; |
| 298 | } |
| 299 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 300 | /*! \brief Decode TS 08.08 Speech Codec list IE |
| 301 | * \param[out] scl Caller-provided memory to store codec list |
| 302 | * \param[in] elem IE value to be decoded |
| 303 | * \param[in] len Length of \a elem in bytes |
| 304 | * \returns number of bytes parsed; negative on error */ |
Philipp Maier | 6f725d6 | 2017-03-24 18:03:17 +0100 | [diff] [blame] | 305 | int gsm0808_dec_speech_codec_list(struct gsm0808_speech_codec_list *scl, |
| 306 | const uint8_t *elem, uint8_t len) |
| 307 | { |
| 308 | const uint8_t *old_elem = elem; |
| 309 | unsigned int i; |
| 310 | int rc; |
| 311 | uint8_t decoded = 0; |
| 312 | |
| 313 | OSMO_ASSERT(scl); |
| 314 | if (!elem) |
| 315 | return -EINVAL; |
| 316 | if (len <= 0) |
| 317 | return -EINVAL; |
| 318 | |
| 319 | memset(scl, 0, sizeof(*scl)); |
| 320 | |
| 321 | for (i = 0; i < ARRAY_SIZE(scl->codec); i++) { |
| 322 | if (len <= 0) |
| 323 | break; |
| 324 | |
| 325 | rc = gsm0808_dec_speech_codec(&scl->codec[i], elem, len); |
| 326 | if (rc < 1) |
| 327 | return -EINVAL; |
| 328 | |
| 329 | elem+=rc; |
| 330 | len -= rc; |
| 331 | decoded++; |
| 332 | } |
| 333 | |
| 334 | scl->len = decoded; |
| 335 | |
| 336 | /* Empty list */ |
| 337 | if (decoded < 1) { |
| 338 | return -EINVAL; |
| 339 | } |
| 340 | |
| 341 | return (int)(elem - old_elem); |
| 342 | } |
Philipp Maier | e0c6530 | 2017-03-28 17:05:40 +0200 | [diff] [blame] | 343 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 344 | /*! \brief Encode TS 08.08 Channel Type IE |
| 345 | * \param[out] msg Message Buffer to which IE is to be appended |
| 346 | * \param[in] ct Channel Type to be encoded |
| 347 | * \returns number of bytes added to \a msg */ |
Philipp Maier | e0c6530 | 2017-03-28 17:05:40 +0200 | [diff] [blame] | 348 | uint8_t gsm0808_enc_channel_type(struct msgb *msg, |
| 349 | const struct gsm0808_channel_type *ct) |
| 350 | { |
| 351 | unsigned int i; |
| 352 | uint8_t byte; |
| 353 | uint8_t *old_tail; |
| 354 | uint8_t *tlv_len; |
| 355 | |
| 356 | OSMO_ASSERT(msg); |
| 357 | OSMO_ASSERT(ct); |
| 358 | OSMO_ASSERT(ct->perm_spch_len <= CHANNEL_TYPE_ELEMENT_MAXLEN - 2); |
| 359 | |
| 360 | /* FIXME: Implement encoding support for Data |
| 361 | * and Speech + CTM Text Telephony */ |
| 362 | if ((ct->ch_indctr & 0x0f) != GSM0808_CHAN_SPEECH |
| 363 | && (ct->ch_indctr & 0x0f) != GSM0808_CHAN_SIGN) |
| 364 | OSMO_ASSERT(false); |
| 365 | |
| 366 | msgb_put_u8(msg, GSM0808_IE_CHANNEL_TYPE); |
| 367 | tlv_len = msgb_put(msg, 1); |
| 368 | old_tail = msg->tail; |
| 369 | |
| 370 | msgb_put_u8(msg, ct->ch_indctr & 0x0f); |
| 371 | msgb_put_u8(msg, ct->ch_rate_type); |
| 372 | |
| 373 | for (i = 0; i < ct->perm_spch_len; i++) { |
| 374 | byte = ct->perm_spch[i]; |
| 375 | |
| 376 | if (i < ct->perm_spch_len - 1) |
| 377 | byte |= 0x80; |
| 378 | msgb_put_u8(msg, byte); |
| 379 | } |
| 380 | |
| 381 | *tlv_len = (uint8_t) (msg->tail - old_tail); |
| 382 | return *tlv_len + 2; |
| 383 | } |
| 384 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 385 | /*! \brief Decode TS 08.08 Channel Type IE |
| 386 | * \param[out] ct Caller-provided memory to store channel type |
| 387 | * \param[in] elem IE Value to be decoded |
| 388 | * \param[in] len Length of \a elem in bytes |
| 389 | * \returns number of bytes parsed; negative on error */ |
Philipp Maier | e0c6530 | 2017-03-28 17:05:40 +0200 | [diff] [blame] | 390 | int gsm0808_dec_channel_type(struct gsm0808_channel_type *ct, |
| 391 | const uint8_t *elem, uint8_t len) |
| 392 | { |
| 393 | unsigned int i; |
| 394 | uint8_t byte; |
| 395 | const uint8_t *old_elem = elem; |
| 396 | |
| 397 | OSMO_ASSERT(ct); |
| 398 | if (!elem) |
| 399 | return -EINVAL; |
| 400 | if (len <= 0) |
| 401 | return -EINVAL; |
| 402 | |
| 403 | memset(ct, 0, sizeof(*ct)); |
| 404 | |
| 405 | ct->ch_indctr = (*elem) & 0x0f; |
| 406 | elem++; |
| 407 | ct->ch_rate_type = (*elem) & 0x0f; |
| 408 | elem++; |
| 409 | |
| 410 | for (i = 0; i < ARRAY_SIZE(ct->perm_spch); i++) { |
| 411 | byte = *elem; |
| 412 | elem++; |
| 413 | ct->perm_spch[i] = byte & 0x7f; |
| 414 | if ((byte & 0x80) == 0x00) |
| 415 | break; |
| 416 | } |
| 417 | ct->perm_spch_len = i + 1; |
| 418 | |
| 419 | return (int)(elem - old_elem); |
| 420 | } |
Philipp Maier | 14e76b9 | 2017-03-28 18:36:52 +0200 | [diff] [blame] | 421 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 422 | /*! \brief Encode TS 08.08 Encryption Information IE |
| 423 | * \param[out] msg Message Buffer to which IE is to be appended |
| 424 | * \param[in] ei Encryption Information to be encoded |
| 425 | * \returns number of bytes appended to \a msg */ |
Philipp Maier | 14e76b9 | 2017-03-28 18:36:52 +0200 | [diff] [blame] | 426 | uint8_t gsm0808_enc_encrypt_info(struct msgb *msg, |
| 427 | const struct gsm0808_encrypt_info *ei) |
| 428 | { |
| 429 | unsigned int i; |
| 430 | uint8_t perm_algo = 0; |
| 431 | uint8_t *ptr; |
| 432 | uint8_t *old_tail; |
| 433 | uint8_t *tlv_len; |
| 434 | |
| 435 | OSMO_ASSERT(msg); |
| 436 | OSMO_ASSERT(ei); |
| 437 | OSMO_ASSERT(ei->key_len <= ARRAY_SIZE(ei->key)); |
| 438 | OSMO_ASSERT(ei->perm_algo_len <= ENCRY_INFO_PERM_ALGO_MAXLEN); |
| 439 | |
| 440 | msgb_put_u8(msg, GSM0808_IE_ENCRYPTION_INFORMATION); |
| 441 | tlv_len = msgb_put(msg, 1); |
| 442 | old_tail = msg->tail; |
| 443 | |
| 444 | for (i = 0; i < ei->perm_algo_len; i++) { |
| 445 | /* Note: gsm_08_08.h defines the permitted algorithms |
| 446 | * as an enum which ranges from 0x01 to 0x08 */ |
| 447 | OSMO_ASSERT(ei->perm_algo[i] != 0); |
| 448 | OSMO_ASSERT(ei->perm_algo[i] <= ENCRY_INFO_PERM_ALGO_MAXLEN); |
| 449 | perm_algo |= (1 << (ei->perm_algo[i] - 1)); |
| 450 | } |
| 451 | |
| 452 | msgb_put_u8(msg, perm_algo); |
| 453 | ptr = msgb_put(msg, ei->key_len); |
| 454 | memcpy(ptr, ei->key, ei->key_len); |
| 455 | |
| 456 | *tlv_len = (uint8_t) (msg->tail - old_tail); |
| 457 | return *tlv_len + 2; |
| 458 | } |
| 459 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 460 | /*! \brief Decode TS 08.08 Encryption Information IE |
| 461 | * \param[out] ei Caller-provided memory to store encryption information |
| 462 | * \param[in] elem IE value to be decoded |
| 463 | * \param[in] len Length of \a elem in bytes |
| 464 | * \returns number of bytes parsed; negative on error */ |
Philipp Maier | 14e76b9 | 2017-03-28 18:36:52 +0200 | [diff] [blame] | 465 | int gsm0808_dec_encrypt_info(struct gsm0808_encrypt_info *ei, |
| 466 | const uint8_t *elem, uint8_t len) |
| 467 | { |
| 468 | uint8_t perm_algo; |
| 469 | unsigned int i; |
| 470 | unsigned int perm_algo_len = 0; |
| 471 | const uint8_t *old_elem = elem; |
| 472 | |
| 473 | OSMO_ASSERT(ei); |
| 474 | if (!elem) |
| 475 | return -EINVAL; |
| 476 | if (len <= 0) |
| 477 | return -EINVAL; |
| 478 | |
| 479 | memset(ei, 0, sizeof(*ei)); |
| 480 | |
| 481 | perm_algo = *elem; |
| 482 | elem++; |
| 483 | |
| 484 | for (i = 0; i < ENCRY_INFO_PERM_ALGO_MAXLEN; i++) { |
| 485 | if (perm_algo & (1 << i)) { |
| 486 | ei->perm_algo[perm_algo_len] = i + 1; |
| 487 | perm_algo_len++; |
| 488 | } |
| 489 | } |
| 490 | ei->perm_algo_len = perm_algo_len; |
| 491 | |
| 492 | ei->key_len = len - 1; |
| 493 | memcpy(ei->key, elem, ei->key_len); |
| 494 | elem+=ei->key_len; |
| 495 | |
| 496 | return (int)(elem - old_elem); |
| 497 | } |
Philipp Maier | 783047e | 2017-03-29 11:35:50 +0200 | [diff] [blame] | 498 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 499 | /*! \brief Encode TS 08.08 Cell Identifier List IE |
| 500 | * \param[out] msg Message Buffer to which IE is to be appended |
| 501 | * \param[in] cil Cell ID List to be encoded |
| 502 | * \returns number of bytes appended to \a msg */ |
Philipp Maier | 783047e | 2017-03-29 11:35:50 +0200 | [diff] [blame] | 503 | uint8_t gsm0808_enc_cell_id_list(struct msgb *msg, |
| 504 | const struct gsm0808_cell_id_list *cil) |
| 505 | { |
| 506 | uint8_t *old_tail; |
| 507 | uint8_t *tlv_len; |
| 508 | unsigned int i; |
| 509 | |
| 510 | OSMO_ASSERT(msg); |
| 511 | OSMO_ASSERT(cil); |
| 512 | |
| 513 | msgb_put_u8(msg, GSM0808_IE_CELL_IDENTIFIER_LIST); |
| 514 | tlv_len = msgb_put(msg, 1); |
| 515 | old_tail = msg->tail; |
| 516 | |
| 517 | msgb_put_u8(msg, cil->id_discr & 0x0f); |
| 518 | |
| 519 | switch (cil->id_discr) { |
| 520 | case CELL_IDENT_LAC: |
| 521 | OSMO_ASSERT(cil->id_list_len <= CELL_ID_LIST_LAC_MAXLEN) |
| 522 | for (i=0;i<cil->id_list_len;i++) { |
| 523 | msgb_put_u16(msg, cil->id_list_lac[i]); |
| 524 | } |
| 525 | break; |
| 526 | case CELL_IDENT_BSS: |
| 527 | /* Does not have any list items */ |
| 528 | break; |
| 529 | default: |
| 530 | /* FIXME: Implement support for all identifier list elements */ |
| 531 | OSMO_ASSERT(false); |
| 532 | } |
| 533 | |
| 534 | *tlv_len = (uint8_t) (msg->tail - old_tail); |
| 535 | return *tlv_len + 2; |
| 536 | } |
| 537 | |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 538 | /*! \brief Decode Cell Identifier List IE |
| 539 | * \param[out] cil Caller-provided memory to store Cell ID list |
| 540 | * \param[in] elem IE value to be decoded |
| 541 | * \param[in] len Length of \a elem in bytes |
| 542 | * \returns number of bytes parsed; negative on error */ |
Philipp Maier | 783047e | 2017-03-29 11:35:50 +0200 | [diff] [blame] | 543 | int gsm0808_dec_cell_id_list(struct gsm0808_cell_id_list *cil, |
| 544 | const uint8_t *elem, uint8_t len) |
| 545 | { |
| 546 | uint8_t id_discr; |
| 547 | const uint8_t *old_elem = elem; |
| 548 | unsigned int item_count = 0; |
| 549 | |
| 550 | OSMO_ASSERT(cil); |
| 551 | if (!elem) |
| 552 | return -EINVAL; |
| 553 | if (len <= 0) |
| 554 | return -EINVAL; |
| 555 | |
| 556 | memset(cil, 0, sizeof(*cil)); |
| 557 | |
| 558 | id_discr = *elem & 0x0f; |
| 559 | elem++; |
| 560 | len--; |
| 561 | |
| 562 | cil->id_discr = id_discr; |
| 563 | |
| 564 | switch (id_discr) { |
| 565 | case CELL_IDENT_LAC: |
| 566 | while (len >= 2) { |
| 567 | cil->id_list_lac[item_count] = osmo_load16be(elem); |
| 568 | elem += 2; |
| 569 | item_count++; |
| 570 | len -= 2; |
| 571 | } |
| 572 | case CELL_IDENT_BSS: |
| 573 | /* Does not have any list items */ |
| 574 | break; |
| 575 | default: |
| 576 | /* FIXME: Implement support for all identifier list elements */ |
| 577 | return -EINVAL; |
| 578 | } |
| 579 | |
| 580 | cil->id_list_len = item_count; |
| 581 | return (int)(elem - old_elem); |
| 582 | } |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 583 | |
| 584 | /*! @} */ |