Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 1 | /* GSM 08.08 BSSMAP handling */ |
| 2 | /* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 3 | * (C) 2009-2010 by On-Waves |
| 4 | * All Rights Reserved |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 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 General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <openbsc/osmo_bsc.h> |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 23 | #include <openbsc/osmo_bsc_grace.h> |
Holger Hans Peter Freyther | 50c579b | 2010-11-10 10:07:30 +0100 | [diff] [blame] | 24 | #include <openbsc/osmo_msc_data.h> |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 25 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | 50c579b | 2010-11-10 10:07:30 +0100 | [diff] [blame] | 26 | #include <openbsc/mgcp.h> |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 27 | |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 28 | #include <osmocore/gsm0808.h> |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 29 | #include <osmocore/protocol/gsm_08_08.h> |
| 30 | |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 31 | #include <arpa/inet.h> |
| 32 | |
| 33 | static uint16_t read_data16(const uint8_t *data) |
| 34 | { |
| 35 | uint16_t res; |
| 36 | |
| 37 | memcpy(&res, data, sizeof(res)); |
| 38 | return res; |
| 39 | } |
| 40 | |
Holger Hans Peter Freyther | 50c579b | 2010-11-10 10:07:30 +0100 | [diff] [blame] | 41 | /* |
| 42 | * helpers for the assignment command |
| 43 | */ |
| 44 | enum gsm0808_permitted_speech audio_support_to_gsm88(struct gsm_audio_support *audio) |
| 45 | { |
| 46 | if (audio->hr) { |
| 47 | switch (audio->ver) { |
| 48 | case 1: |
| 49 | return GSM0808_PERM_HR1; |
| 50 | break; |
| 51 | case 2: |
| 52 | return GSM0808_PERM_HR2; |
| 53 | break; |
| 54 | case 3: |
| 55 | return GSM0808_PERM_HR3; |
| 56 | break; |
| 57 | default: |
| 58 | LOGP(DMSC, LOGL_ERROR, "Wrong speech mode: %d\n", audio->ver); |
| 59 | return GSM0808_PERM_FR1; |
| 60 | } |
| 61 | } else { |
| 62 | switch (audio->ver) { |
| 63 | case 1: |
| 64 | return GSM0808_PERM_FR1; |
| 65 | break; |
| 66 | case 2: |
| 67 | return GSM0808_PERM_FR2; |
| 68 | break; |
| 69 | case 3: |
| 70 | return GSM0808_PERM_FR3; |
| 71 | break; |
| 72 | default: |
| 73 | LOGP(DMSC, LOGL_ERROR, "Wrong speech mode: %d\n", audio->ver); |
| 74 | return GSM0808_PERM_HR1; |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | enum gsm48_chan_mode gsm88_to_chan_mode(enum gsm0808_permitted_speech speech) |
| 80 | { |
| 81 | switch (speech) { |
| 82 | case GSM0808_PERM_HR1: |
| 83 | case GSM0808_PERM_FR1: |
| 84 | return GSM48_CMODE_SPEECH_V1; |
| 85 | break; |
| 86 | case GSM0808_PERM_HR2: |
| 87 | case GSM0808_PERM_FR2: |
| 88 | return GSM48_CMODE_SPEECH_EFR; |
| 89 | break; |
| 90 | case GSM0808_PERM_HR3: |
| 91 | case GSM0808_PERM_FR3: |
| 92 | return GSM48_CMODE_SPEECH_AMR; |
| 93 | break; |
| 94 | } |
| 95 | |
| 96 | LOGP(DMSC, LOGL_FATAL, "Should not be reached.\n"); |
| 97 | return GSM48_CMODE_SPEECH_AMR; |
| 98 | } |
| 99 | |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 100 | static int bssmap_handle_reset_ack(struct gsm_network *net, |
| 101 | struct msgb *msg, unsigned int length) |
| 102 | { |
| 103 | LOGP(DMSC, LOGL_NOTICE, "Reset ACK from MSC\n"); |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | /* GSM 08.08 ยง 3.2.1.19 */ |
| 108 | static int bssmap_handle_paging(struct gsm_network *net, |
| 109 | struct msgb *msg, unsigned int payload_length) |
| 110 | { |
| 111 | struct tlv_parsed tp; |
| 112 | char mi_string[GSM48_MI_SIZE]; |
| 113 | uint32_t tmsi = GSM_RESERVED_TMSI; |
| 114 | unsigned int lac = GSM_LAC_RESERVED_ALL_BTS; |
| 115 | uint8_t data_length; |
| 116 | const uint8_t *data; |
| 117 | uint8_t chan_needed = RSL_CHANNEED_ANY; |
| 118 | |
| 119 | tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, payload_length - 1, 0, 0); |
| 120 | |
| 121 | if (!TLVP_PRESENT(&tp, GSM0808_IE_IMSI)) { |
| 122 | LOGP(DMSC, LOGL_ERROR, "Mandantory IMSI not present.\n"); |
| 123 | return -1; |
| 124 | } else if ((TLVP_VAL(&tp, GSM0808_IE_IMSI)[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) { |
| 125 | LOGP(DMSC, LOGL_ERROR, "Wrong content in the IMSI\n"); |
| 126 | return -1; |
| 127 | } |
| 128 | |
| 129 | if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST)) { |
| 130 | LOGP(DMSC, LOGL_ERROR, "Mandantory CELL IDENTIFIER LIST not present.\n"); |
| 131 | return -1; |
| 132 | } |
| 133 | |
| 134 | if (TLVP_PRESENT(&tp, GSM0808_IE_TMSI)) { |
| 135 | gsm48_mi_to_string(mi_string, sizeof(mi_string), |
| 136 | TLVP_VAL(&tp, GSM0808_IE_TMSI), TLVP_LEN(&tp, GSM0808_IE_TMSI)); |
| 137 | tmsi = strtoul(mi_string, NULL, 10); |
| 138 | } |
| 139 | |
| 140 | |
| 141 | /* |
| 142 | * parse the IMSI |
| 143 | */ |
| 144 | gsm48_mi_to_string(mi_string, sizeof(mi_string), |
| 145 | TLVP_VAL(&tp, GSM0808_IE_IMSI), TLVP_LEN(&tp, GSM0808_IE_IMSI)); |
| 146 | |
| 147 | /* |
| 148 | * parse the cell identifier list |
| 149 | */ |
| 150 | data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST); |
| 151 | data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST); |
| 152 | |
| 153 | /* |
| 154 | * Support paging to all network or one BTS at one LAC |
| 155 | */ |
| 156 | if (data_length == 3 && data[0] == CELL_IDENT_LAC) { |
| 157 | lac = ntohs(read_data16(&data[1])); |
| 158 | } else if (data_length > 1 || (data[0] & 0x0f) != CELL_IDENT_BSS) { |
| 159 | LOGP(DMSC, LOGL_ERROR, "Unsupported Cell Identifier List: %s\n", hexdump(data, data_length)); |
| 160 | return -1; |
| 161 | } |
| 162 | |
| 163 | if (TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_NEEDED) && TLVP_LEN(&tp, GSM0808_IE_CHANNEL_NEEDED) == 1) |
| 164 | chan_needed = TLVP_VAL(&tp, GSM0808_IE_CHANNEL_NEEDED)[0] & 0x03; |
| 165 | |
| 166 | if (TLVP_PRESENT(&tp, GSM0808_IE_EMLPP_PRIORITY)) { |
| 167 | LOGP(DMSC, LOGL_ERROR, "eMLPP is not handled\n"); |
| 168 | } |
| 169 | |
| 170 | LOGP(DMSC, LOGL_DEBUG, "Paging request from MSC IMSI: '%s' TMSI: '0x%x/%u' LAC: 0x%x\n", mi_string, tmsi, tmsi, lac); |
| 171 | LOGP(DMSC, LOGL_ERROR, "Paging is not implemented...\n"); |
| 172 | return -1; |
| 173 | } |
| 174 | |
Holger Hans Peter Freyther | f1f57a8 | 2010-11-10 09:34:47 +0100 | [diff] [blame] | 175 | /* |
| 176 | * GSM 08.08 ยง 3.1.9.1 and 3.2.1.21... |
| 177 | * release our gsm_subscriber_connection and send message |
| 178 | */ |
| 179 | static int bssmap_handle_clear_command(struct osmo_bsc_sccp_con *conn, |
| 180 | struct msgb *msg, unsigned int payload_length) |
| 181 | { |
| 182 | struct msgb *resp; |
| 183 | |
| 184 | /* TODO: handle the cause of this package */ |
| 185 | |
| 186 | if (conn->conn) { |
| 187 | LOGP(DMSC, LOGL_DEBUG, "Releasing all transactions on %p\n", conn); |
| 188 | gsm0808_clear(conn->conn); |
| 189 | subscr_con_free(conn->conn); |
| 190 | conn->conn = NULL; |
| 191 | } |
| 192 | |
| 193 | /* send the clear complete message */ |
| 194 | resp = gsm0808_create_clear_complete(); |
| 195 | if (!resp) { |
| 196 | LOGP(DMSC, LOGL_ERROR, "Sending clear complete failed.\n"); |
| 197 | return -1; |
| 198 | } |
| 199 | |
| 200 | bsc_queue_for_msc(conn, resp); |
| 201 | return 0; |
| 202 | } |
| 203 | |
Holger Hans Peter Freyther | fae3c65 | 2010-11-10 09:44:34 +0100 | [diff] [blame] | 204 | /* |
| 205 | * GSM 08.08 ยง 3.4.7 cipher mode handling. We will have to pick |
| 206 | * the cipher to be used for this. In case we are already using |
| 207 | * a cipher we will have to send cipher mode reject to the MSC, |
| 208 | * otherwise we will have to pick something that we and the MS |
| 209 | * is supporting. Currently we are doing it in a rather static |
| 210 | * way by picking one ecnryption or no encrytpion. |
| 211 | */ |
| 212 | static int bssmap_handle_cipher_mode(struct osmo_bsc_sccp_con *conn, |
| 213 | struct msgb *msg, unsigned int payload_length) |
| 214 | { |
| 215 | uint16_t len; |
| 216 | struct gsm_network *network = NULL; |
| 217 | const uint8_t *data; |
| 218 | struct tlv_parsed tp; |
| 219 | struct msgb *resp; |
| 220 | int reject_cause = -1; |
| 221 | int include_imeisv = 1; |
| 222 | |
| 223 | if (!conn->conn) { |
| 224 | LOGP(DMSC, LOGL_ERROR, "No lchan/msc_data in cipher mode command.\n"); |
| 225 | goto reject; |
| 226 | } |
| 227 | |
| 228 | if (conn->ciphering_handled) { |
| 229 | LOGP(DMSC, LOGL_ERROR, "Already seen ciphering command. Protocol Error.\n"); |
| 230 | goto reject; |
| 231 | } |
| 232 | |
| 233 | conn->ciphering_handled = 1; |
| 234 | |
| 235 | tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, payload_length - 1, 0, 0); |
| 236 | if (!TLVP_PRESENT(&tp, GSM0808_IE_ENCRYPTION_INFORMATION)) { |
| 237 | LOGP(DMSC, LOGL_ERROR, "IE Encryption Information missing.\n"); |
| 238 | goto reject; |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * check if our global setting is allowed |
| 243 | * - Currently we check for A5/0 and A5/1 |
| 244 | * - Copy the key if that is necessary |
| 245 | * - Otherwise reject |
| 246 | */ |
| 247 | len = TLVP_LEN(&tp, GSM0808_IE_ENCRYPTION_INFORMATION); |
| 248 | if (len < 1) { |
| 249 | LOGP(DMSC, LOGL_ERROR, "IE Encryption Information is too short.\n"); |
| 250 | goto reject; |
| 251 | } |
| 252 | |
| 253 | network = conn->conn->bts->network; |
| 254 | data = TLVP_VAL(&tp, GSM0808_IE_ENCRYPTION_INFORMATION); |
| 255 | |
| 256 | if (TLVP_PRESENT(&tp, GSM0808_IE_CIPHER_RESPONSE_MODE)) |
| 257 | include_imeisv = TLVP_VAL(&tp, GSM0808_IE_CIPHER_RESPONSE_MODE)[0] & 0x1; |
| 258 | |
| 259 | if (network->a5_encryption == 0 && (data[0] & 0x1) == 0x1) { |
| 260 | gsm0808_cipher_mode(conn->conn, 0, NULL, 0, include_imeisv); |
| 261 | } else if (network->a5_encryption != 0 && (data[0] & 0x2) == 0x2) { |
| 262 | gsm0808_cipher_mode(conn->conn, 1, &data[1], len - 1, include_imeisv); |
| 263 | } else { |
| 264 | LOGP(DMSC, LOGL_ERROR, "Can not select encryption...\n"); |
| 265 | goto reject; |
| 266 | } |
| 267 | |
| 268 | reject: |
| 269 | resp = gsm0808_create_cipher_reject(reject_cause); |
| 270 | if (!resp) { |
| 271 | LOGP(DMSC, LOGL_ERROR, "Sending the cipher reject failed.\n"); |
| 272 | return -1; |
| 273 | } |
| 274 | |
| 275 | bsc_queue_for_msc(conn, resp); |
| 276 | return -1; |
| 277 | } |
| 278 | |
Holger Hans Peter Freyther | 50c579b | 2010-11-10 10:07:30 +0100 | [diff] [blame] | 279 | /* |
| 280 | * Handle the assignment request message. |
| 281 | * |
| 282 | * See ยง3.2.1.1 for the message type |
| 283 | */ |
| 284 | static int bssmap_handle_assignm_req(struct osmo_bsc_sccp_con *conn, |
| 285 | struct msgb *msg, unsigned int length) |
| 286 | { |
| 287 | struct msgb *resp; |
| 288 | struct gsm_network *network; |
| 289 | struct tlv_parsed tp; |
| 290 | uint8_t *data; |
| 291 | uint16_t cic; |
| 292 | uint8_t timeslot; |
| 293 | uint8_t multiplex; |
| 294 | enum gsm48_chan_mode chan_mode = GSM48_CMODE_SIGN; |
| 295 | int i, supported, port, full_rate = -1; |
| 296 | |
| 297 | if (!conn->conn) { |
| 298 | LOGP(DMSC, LOGL_ERROR, "No lchan/msc_data in cipher mode command.\n"); |
| 299 | return -1; |
| 300 | } |
| 301 | |
| 302 | network = conn->conn->bts->network; |
| 303 | tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, length - 1, 0, 0); |
| 304 | |
| 305 | if (!TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_TYPE)) { |
| 306 | LOGP(DMSC, LOGL_ERROR, "Mandantory channel type not present.\n"); |
| 307 | goto reject; |
| 308 | } |
| 309 | |
| 310 | if (!TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) { |
| 311 | LOGP(DMSC, LOGL_ERROR, "Identity code missing. Audio routing will not work.\n"); |
| 312 | goto reject; |
| 313 | } |
| 314 | |
| 315 | cic = ntohs(read_data16(TLVP_VAL(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE))); |
| 316 | timeslot = cic & 0x1f; |
| 317 | multiplex = (cic & ~0x1f) >> 5; |
| 318 | |
| 319 | /* |
| 320 | * Currently we only support a limited subset of all |
| 321 | * possible channel types. The limitation ends by not using |
| 322 | * multi-slot, limiting the channel coding, speech... |
| 323 | */ |
| 324 | if (TLVP_LEN(&tp, GSM0808_IE_CHANNEL_TYPE) < 3) { |
| 325 | LOGP(DMSC, LOGL_ERROR, "ChannelType len !=3 not supported: %d\n", |
| 326 | TLVP_LEN(&tp, GSM0808_IE_CHANNEL_TYPE)); |
| 327 | goto reject; |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * Try to figure out if we support the proposed speech codecs. For |
| 332 | * now we will always pick the full rate codecs. |
| 333 | */ |
| 334 | |
| 335 | data = (uint8_t *) TLVP_VAL(&tp, GSM0808_IE_CHANNEL_TYPE); |
| 336 | if ((data[0] & 0xf) != 0x1) { |
| 337 | LOGP(DMSC, LOGL_ERROR, "ChannelType != speech: %d\n", data[0]); |
| 338 | goto reject; |
| 339 | } |
| 340 | |
| 341 | if (data[1] != GSM0808_SPEECH_FULL_PREF && data[1] != GSM0808_SPEECH_HALF_PREF) { |
| 342 | LOGP(DMSC, LOGL_ERROR, "ChannelType full not allowed: %d\n", data[1]); |
| 343 | goto reject; |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * go through the list of preferred codecs of our gsm network |
| 348 | * and try to find it among the permitted codecs. If we found |
| 349 | * it we will send chan_mode to the right mode and break the |
| 350 | * inner loop. The outer loop will exit due chan_mode having |
| 351 | * the correct value. |
| 352 | */ |
| 353 | full_rate = 0; |
| 354 | for (supported = 0; |
| 355 | chan_mode == GSM48_CMODE_SIGN && supported < network->msc_data->audio_length; |
| 356 | ++supported) { |
| 357 | |
| 358 | int perm_val = audio_support_to_gsm88(network->msc_data->audio_support[supported]); |
| 359 | for (i = 2; i < TLVP_LEN(&tp, GSM0808_IE_CHANNEL_TYPE); ++i) { |
| 360 | if ((data[i] & 0x7f) == perm_val) { |
| 361 | chan_mode = gsm88_to_chan_mode(perm_val); |
| 362 | full_rate = (data[i] & 0x4) == 0; |
| 363 | break; |
| 364 | } else if ((data[i] & 0x80) == 0x00) { |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | if (chan_mode == GSM48_CMODE_SIGN) { |
| 371 | LOGP(DMSC, LOGL_ERROR, "No supported audio type found.\n"); |
| 372 | goto reject; |
| 373 | } |
| 374 | |
| 375 | /* map it to a MGCP Endpoint and a RTP port */ |
| 376 | port = mgcp_timeslot_to_endpoint(multiplex, timeslot); |
| 377 | conn->rtp_port = rtp_calculate_port(port, |
| 378 | network->msc_data->rtp_base); |
| 379 | |
| 380 | return gsm0808_assign_req(conn->conn, chan_mode, full_rate); |
| 381 | |
| 382 | reject: |
| 383 | resp = gsm0808_create_assignment_failure(GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL); |
| 384 | if (!resp) { |
| 385 | LOGP(DMSC, LOGL_ERROR, "Channel allocation failure.\n"); |
| 386 | return -1; |
| 387 | } |
| 388 | |
| 389 | bsc_queue_for_msc(conn, resp); |
| 390 | return -1; |
| 391 | } |
| 392 | |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 393 | static int bssmap_rcvmsg_udt(struct gsm_network *net, |
| 394 | struct msgb *msg, unsigned int length) |
| 395 | { |
| 396 | int ret = 0; |
| 397 | |
| 398 | if (length < 1) { |
| 399 | LOGP(DMSC, LOGL_ERROR, "Not enough room: %d\n", length); |
| 400 | return -1; |
| 401 | } |
| 402 | |
| 403 | switch (msg->l4h[0]) { |
| 404 | case BSS_MAP_MSG_RESET_ACKNOWLEDGE: |
| 405 | ret = bssmap_handle_reset_ack(net, msg, length); |
| 406 | break; |
| 407 | case BSS_MAP_MSG_PAGING: |
| 408 | if (bsc_grace_allow_new_connection(net)) |
| 409 | ret = bssmap_handle_paging(net, msg, length); |
| 410 | break; |
| 411 | } |
| 412 | |
| 413 | return ret; |
| 414 | } |
| 415 | |
| 416 | static int bssmap_rcvmsg_dt1(struct osmo_bsc_sccp_con *conn, |
| 417 | struct msgb *msg, unsigned int length) |
| 418 | { |
Holger Hans Peter Freyther | f1f57a8 | 2010-11-10 09:34:47 +0100 | [diff] [blame] | 419 | int ret = 0; |
| 420 | |
| 421 | if (length < 1) { |
| 422 | LOGP(DMSC, LOGL_ERROR, "Not enough room: %d\n", length); |
| 423 | return -1; |
| 424 | } |
| 425 | |
| 426 | switch (msg->l4h[0]) { |
| 427 | case BSS_MAP_MSG_CLEAR_CMD: |
| 428 | ret = bssmap_handle_clear_command(conn, msg, length); |
| 429 | break; |
Holger Hans Peter Freyther | fae3c65 | 2010-11-10 09:44:34 +0100 | [diff] [blame] | 430 | case BSS_MAP_MSG_CIPHER_MODE_CMD: |
| 431 | ret = bssmap_handle_cipher_mode(conn, msg, length); |
| 432 | break; |
Holger Hans Peter Freyther | 50c579b | 2010-11-10 10:07:30 +0100 | [diff] [blame] | 433 | case BSS_MAP_MSG_ASSIGMENT_RQST: |
| 434 | ret = bssmap_handle_assignm_req(conn, msg, length); |
| 435 | break; |
Holger Hans Peter Freyther | f1f57a8 | 2010-11-10 09:34:47 +0100 | [diff] [blame] | 436 | default: |
| 437 | LOGP(DMSC, LOGL_DEBUG, "Unimplemented msg type: %d\n", msg->l4h[0]); |
| 438 | break; |
| 439 | } |
| 440 | |
| 441 | return ret; |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | static int dtap_rcvmsg(struct osmo_bsc_sccp_con *conn, |
| 445 | struct msgb *msg, unsigned int length) |
| 446 | { |
Holger Hans Peter Freyther | dbc698a | 2010-11-10 10:17:05 +0100 | [diff] [blame^] | 447 | struct dtap_header *header; |
| 448 | struct msgb *gsm48; |
| 449 | uint8_t *data; |
| 450 | |
| 451 | if (!conn->conn) { |
| 452 | LOGP(DMSC, LOGL_ERROR, "No subscriber connection available\n"); |
| 453 | return -1; |
| 454 | } |
| 455 | |
| 456 | header = (struct dtap_header *) msg->l3h; |
| 457 | if (sizeof(*header) >= length) { |
| 458 | LOGP(DMSC, LOGL_ERROR, "The DTAP header does not fit. Wanted: %u got: %u\n", sizeof(*header), length); |
| 459 | LOGP(DMSC, LOGL_ERROR, "hex: %s\n", hexdump(msg->l3h, length)); |
| 460 | return -1; |
| 461 | } |
| 462 | |
| 463 | if (header->length > length - sizeof(*header)) { |
| 464 | LOGP(DMSC, LOGL_ERROR, "The DTAP l4 information does not fit: header: %u length: %u\n", header->length, length); |
| 465 | LOGP(DMSC, LOGL_ERROR, "hex: %s\n", hexdump(msg->l3h, length)); |
| 466 | return -1; |
| 467 | } |
| 468 | |
| 469 | LOGP(DMSC, LOGL_DEBUG, "DTAP message: SAPI: %u CHAN: %u\n", header->link_id & 0x07, header->link_id & 0xC0); |
| 470 | |
| 471 | /* forward the data */ |
| 472 | gsm48 = gsm48_msgb_alloc(); |
| 473 | if (!gsm48) { |
| 474 | LOGP(DMSC, LOGL_ERROR, "Allocation of the message failed.\n"); |
| 475 | return -1; |
| 476 | } |
| 477 | |
| 478 | gsm48->l3h = gsm48->data; |
| 479 | data = msgb_put(gsm48, length - sizeof(*header)); |
| 480 | memcpy(data, msg->l3h + sizeof(*header), length - sizeof(*header)); |
| 481 | |
| 482 | /* pass it to the filter for extra actions */ |
| 483 | bsc_scan_msc_msg(conn->conn, gsm48); |
| 484 | return gsm0808_submit_dtap(conn->conn, gsm48, header->link_id, 1); |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 485 | } |
| 486 | |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 487 | int bsc_handle_udt(struct gsm_network *network, |
| 488 | struct bsc_msc_connection *conn, |
| 489 | struct msgb *msgb, unsigned int length) |
| 490 | { |
| 491 | struct bssmap_header *bs; |
| 492 | |
| 493 | LOGP(DMSC, LOGL_DEBUG, "Incoming SCCP message ftom MSC: %s\n", |
| 494 | hexdump(msgb->l3h, length)); |
| 495 | |
| 496 | if (length < sizeof(*bs)) { |
| 497 | LOGP(DMSC, LOGL_ERROR, "The header is too short.\n"); |
| 498 | return -1; |
| 499 | } |
| 500 | |
| 501 | bs = (struct bssmap_header *) msgb->l3h; |
| 502 | if (bs->length < length - sizeof(*bs)) |
| 503 | return -1; |
| 504 | |
| 505 | switch (bs->type) { |
| 506 | case BSSAP_MSG_BSS_MANAGEMENT: |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 507 | msgb->l4h = &msgb->l3h[sizeof(*bs)]; |
| 508 | bssmap_rcvmsg_udt(network, msgb, length - sizeof(*bs)); |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 509 | break; |
| 510 | default: |
| 511 | LOGP(DMSC, LOGL_ERROR, "Unimplemented msg type: %d\n", bs->type); |
| 512 | } |
| 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | int bsc_handle_dt1(struct osmo_bsc_sccp_con *conn, |
| 518 | struct msgb *msg, unsigned int len) |
| 519 | { |
Holger Hans Peter Freyther | 890dfc5 | 2010-11-10 09:24:37 +0100 | [diff] [blame] | 520 | if (len < sizeof(struct bssmap_header)) { |
| 521 | LOGP(DMSC, LOGL_ERROR, "The header is too short.\n"); |
| 522 | } |
| 523 | |
| 524 | switch (msg->l3h[0]) { |
| 525 | case BSSAP_MSG_BSS_MANAGEMENT: |
| 526 | msg->l4h = &msg->l3h[sizeof(struct bssmap_header)]; |
| 527 | bssmap_rcvmsg_dt1(conn, msg, len - sizeof(struct bssmap_header)); |
| 528 | break; |
| 529 | case BSSAP_MSG_DTAP: |
| 530 | dtap_rcvmsg(conn, msg, len); |
| 531 | break; |
| 532 | default: |
| 533 | LOGP(DMSC, LOGL_DEBUG, "Unimplemented msg type: %d\n", msg->l3h[0]); |
| 534 | } |
| 535 | |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 536 | return -1; |
| 537 | } |