Neels Hofmeyr | e9920f2 | 2017-07-10 15:07:22 +0200 | [diff] [blame] | 1 | /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| 2 | /* The protocol implementation */ |
| 3 | |
| 4 | /* |
| 5 | * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 6 | * (C) 2009-2012 by On-Waves |
| 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 Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 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 Affero General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <string.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <unistd.h> |
| 27 | #include <errno.h> |
| 28 | #include <time.h> |
| 29 | #include <limits.h> |
| 30 | |
| 31 | #include <sys/socket.h> |
| 32 | #include <arpa/inet.h> |
| 33 | |
| 34 | #include <osmocom/core/msgb.h> |
| 35 | #include <osmocom/core/select.h> |
| 36 | |
| 37 | #include <osmocom/netif/rtp.h> |
| 38 | |
| 39 | #include <osmocom/legacy_mgcp/mgcp.h> |
| 40 | #include <osmocom/legacy_mgcp/mgcp_internal.h> |
| 41 | |
| 42 | #include <osmocom/legacy_mgcp/osmux.h> |
| 43 | |
| 44 | #warning "Make use of the rtp proxy code" |
| 45 | |
| 46 | |
| 47 | #define RTP_SEQ_MOD (1 << 16) |
| 48 | #define RTP_MAX_DROPOUT 3000 |
| 49 | #define RTP_MAX_MISORDER 100 |
| 50 | #define RTP_BUF_SIZE 4096 |
| 51 | |
| 52 | enum { |
| 53 | MGCP_PROTO_RTP, |
| 54 | MGCP_PROTO_RTCP, |
| 55 | }; |
| 56 | |
| 57 | /** |
| 58 | * This does not need to be a precision timestamp and |
| 59 | * is allowed to wrap quite fast. The returned value is |
| 60 | * 1/unit seconds. |
| 61 | */ |
| 62 | static uint32_t get_current_ts(unsigned unit) |
| 63 | { |
| 64 | struct timespec tp; |
| 65 | uint64_t ret; |
| 66 | |
| 67 | if (!unit) |
| 68 | return 0; |
| 69 | |
| 70 | memset(&tp, 0, sizeof(tp)); |
| 71 | if (clock_gettime(CLOCK_MONOTONIC, &tp) != 0) |
| 72 | LOGP(DLMGCP, LOGL_NOTICE, |
| 73 | "Getting the clock failed.\n"); |
| 74 | |
| 75 | /* convert it to 1/unit seconds */ |
| 76 | ret = tp.tv_sec; |
| 77 | ret *= unit; |
| 78 | ret += (int64_t)tp.tv_nsec * unit / 1000 / 1000 / 1000; |
| 79 | |
| 80 | return ret; |
| 81 | } |
| 82 | |
| 83 | int mgcp_udp_send(int fd, struct in_addr *addr, int port, char *buf, int len) |
| 84 | { |
| 85 | struct sockaddr_in out; |
| 86 | out.sin_family = AF_INET; |
| 87 | out.sin_port = port; |
| 88 | memcpy(&out.sin_addr, addr, sizeof(*addr)); |
| 89 | |
| 90 | return sendto(fd, buf, len, 0, (struct sockaddr *)&out, sizeof(out)); |
| 91 | } |
| 92 | |
| 93 | int mgcp_send_dummy(struct mgcp_endpoint *endp) |
| 94 | { |
| 95 | static char buf[] = { MGCP_DUMMY_LOAD }; |
| 96 | int rc; |
| 97 | int was_rtcp = 0; |
| 98 | |
| 99 | rc = mgcp_udp_send(endp->net_end.rtp.fd, &endp->net_end.addr, |
| 100 | endp->net_end.rtp_port, buf, 1); |
| 101 | |
| 102 | if (rc == -1) |
| 103 | goto failed; |
| 104 | |
| 105 | if (endp->tcfg->omit_rtcp) |
| 106 | return rc; |
| 107 | |
| 108 | was_rtcp = 1; |
| 109 | rc = mgcp_udp_send(endp->net_end.rtcp.fd, &endp->net_end.addr, |
| 110 | endp->net_end.rtcp_port, buf, 1); |
| 111 | |
| 112 | if (rc >= 0) |
| 113 | return rc; |
| 114 | |
| 115 | failed: |
| 116 | LOGP(DLMGCP, LOGL_ERROR, |
| 117 | "Failed to send dummy %s packet: %s on: 0x%x to %s:%d\n", |
| 118 | was_rtcp ? "RTCP" : "RTP", |
| 119 | strerror(errno), ENDPOINT_NUMBER(endp), inet_ntoa(endp->net_end.addr), |
| 120 | was_rtcp ? endp->net_end.rtcp_port : endp->net_end.rtp_port); |
| 121 | |
| 122 | return -1; |
| 123 | } |
| 124 | |
| 125 | static int32_t compute_timestamp_aligment_error(struct mgcp_rtp_stream_state *sstate, |
| 126 | int ptime, uint32_t timestamp) |
| 127 | { |
| 128 | int32_t timestamp_delta; |
| 129 | |
| 130 | if (ptime == 0) |
| 131 | return 0; |
| 132 | |
| 133 | /* Align according to: T - Tlast = k * Tptime */ |
| 134 | timestamp_delta = timestamp - sstate->last_timestamp; |
| 135 | |
| 136 | return timestamp_delta % ptime; |
| 137 | } |
| 138 | |
| 139 | static int check_rtp_timestamp(struct mgcp_endpoint *endp, |
| 140 | struct mgcp_rtp_state *state, |
| 141 | struct mgcp_rtp_stream_state *sstate, |
| 142 | struct mgcp_rtp_end *rtp_end, |
| 143 | struct sockaddr_in *addr, |
| 144 | uint16_t seq, uint32_t timestamp, |
| 145 | const char *text, int32_t *tsdelta_out) |
| 146 | { |
| 147 | int32_t tsdelta; |
| 148 | int32_t timestamp_error; |
| 149 | |
| 150 | /* Not fully intialized, skip */ |
| 151 | if (sstate->last_tsdelta == 0 && timestamp == sstate->last_timestamp) |
| 152 | return 0; |
| 153 | |
| 154 | if (seq == sstate->last_seq) { |
| 155 | if (timestamp != sstate->last_timestamp) { |
| 156 | sstate->err_ts_counter += 1; |
| 157 | LOGP(DLMGCP, LOGL_ERROR, |
| 158 | "The %s timestamp delta is != 0 but the sequence " |
| 159 | "number %d is the same, " |
| 160 | "TS offset: %d, SeqNo offset: %d " |
| 161 | "on 0x%x SSRC: %u timestamp: %u " |
| 162 | "from %s:%d in %d\n", |
| 163 | text, seq, |
| 164 | state->timestamp_offset, state->seq_offset, |
| 165 | ENDPOINT_NUMBER(endp), sstate->ssrc, timestamp, |
| 166 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 167 | endp->conn_mode); |
| 168 | } |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | tsdelta = |
| 173 | (int32_t)(timestamp - sstate->last_timestamp) / |
| 174 | (int16_t)(seq - sstate->last_seq); |
| 175 | |
| 176 | if (tsdelta == 0) { |
| 177 | /* Don't update *tsdelta_out */ |
| 178 | LOGP(DLMGCP, LOGL_NOTICE, |
| 179 | "The %s timestamp delta is %d " |
| 180 | "on 0x%x SSRC: %u timestamp: %u " |
| 181 | "from %s:%d in %d\n", |
| 182 | text, tsdelta, |
| 183 | ENDPOINT_NUMBER(endp), sstate->ssrc, timestamp, |
| 184 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 185 | endp->conn_mode); |
| 186 | |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | if (sstate->last_tsdelta != tsdelta) { |
| 191 | if (sstate->last_tsdelta) { |
| 192 | LOGP(DLMGCP, LOGL_INFO, |
| 193 | "The %s timestamp delta changes from %d to %d " |
| 194 | "on 0x%x SSRC: %u timestamp: %u from %s:%d in %d\n", |
| 195 | text, sstate->last_tsdelta, tsdelta, |
| 196 | ENDPOINT_NUMBER(endp), sstate->ssrc, timestamp, |
| 197 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 198 | endp->conn_mode); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | if (tsdelta_out) |
| 203 | *tsdelta_out = tsdelta; |
| 204 | |
| 205 | timestamp_error = |
| 206 | compute_timestamp_aligment_error(sstate, state->packet_duration, |
| 207 | timestamp); |
| 208 | |
| 209 | if (timestamp_error) { |
| 210 | sstate->err_ts_counter += 1; |
| 211 | LOGP(DLMGCP, LOGL_NOTICE, |
| 212 | "The %s timestamp has an alignment error of %d " |
| 213 | "on 0x%x SSRC: %u " |
| 214 | "SeqNo delta: %d, TS delta: %d, dTS/dSeq: %d " |
| 215 | "from %s:%d in mode %d. ptime: %d\n", |
| 216 | text, timestamp_error, |
| 217 | ENDPOINT_NUMBER(endp), sstate->ssrc, |
| 218 | (int16_t)(seq - sstate->last_seq), |
| 219 | (int32_t)(timestamp - sstate->last_timestamp), |
| 220 | tsdelta, |
| 221 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 222 | endp->conn_mode, state->packet_duration); |
| 223 | } |
| 224 | return 1; |
| 225 | } |
| 226 | |
| 227 | /* Set the timestamp offset according to the packet duration. */ |
| 228 | static int adjust_rtp_timestamp_offset(struct mgcp_endpoint *endp, |
| 229 | struct mgcp_rtp_state *state, |
| 230 | struct mgcp_rtp_end *rtp_end, |
| 231 | struct sockaddr_in *addr, |
| 232 | int16_t delta_seq, uint32_t in_timestamp) |
| 233 | { |
| 234 | int32_t tsdelta = state->packet_duration; |
| 235 | int timestamp_offset; |
| 236 | uint32_t out_timestamp; |
| 237 | |
| 238 | if (tsdelta == 0) { |
| 239 | tsdelta = state->out_stream.last_tsdelta; |
| 240 | if (tsdelta != 0) { |
| 241 | LOGP(DLMGCP, LOGL_NOTICE, |
| 242 | "A fixed packet duration is not available on 0x%x, " |
| 243 | "using last output timestamp delta instead: %d " |
| 244 | "from %s:%d in %d\n", |
| 245 | ENDPOINT_NUMBER(endp), tsdelta, |
| 246 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 247 | endp->conn_mode); |
| 248 | } else { |
| 249 | tsdelta = rtp_end->codec.rate * 20 / 1000; |
| 250 | LOGP(DLMGCP, LOGL_NOTICE, |
| 251 | "Fixed packet duration and last timestamp delta " |
| 252 | "are not available on 0x%x, " |
| 253 | "using fixed 20ms instead: %d " |
| 254 | "from %s:%d in %d\n", |
| 255 | ENDPOINT_NUMBER(endp), tsdelta, |
| 256 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 257 | endp->conn_mode); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | out_timestamp = state->out_stream.last_timestamp + delta_seq * tsdelta; |
| 262 | timestamp_offset = out_timestamp - in_timestamp; |
| 263 | |
| 264 | if (state->timestamp_offset != timestamp_offset) { |
| 265 | state->timestamp_offset = timestamp_offset; |
| 266 | |
| 267 | LOGP(DLMGCP, LOGL_NOTICE, |
| 268 | "Timestamp offset change on 0x%x SSRC: %u " |
| 269 | "SeqNo delta: %d, TS offset: %d, " |
| 270 | "from %s:%d in %d\n", |
| 271 | ENDPOINT_NUMBER(endp), state->in_stream.ssrc, |
| 272 | delta_seq, state->timestamp_offset, |
| 273 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 274 | endp->conn_mode); |
| 275 | } |
| 276 | |
| 277 | return timestamp_offset; |
| 278 | } |
| 279 | |
| 280 | /* Set the timestamp offset according to the packet duration. */ |
| 281 | static int align_rtp_timestamp_offset(struct mgcp_endpoint *endp, |
| 282 | struct mgcp_rtp_state *state, |
| 283 | struct mgcp_rtp_end *rtp_end, |
| 284 | struct sockaddr_in *addr, |
| 285 | uint32_t timestamp) |
| 286 | { |
| 287 | int timestamp_error = 0; |
| 288 | int ptime = state->packet_duration; |
| 289 | |
| 290 | /* Align according to: T + Toffs - Tlast = k * Tptime */ |
| 291 | |
| 292 | timestamp_error = compute_timestamp_aligment_error( |
| 293 | &state->out_stream, ptime, |
| 294 | timestamp + state->timestamp_offset); |
| 295 | |
| 296 | if (timestamp_error) { |
| 297 | state->timestamp_offset += ptime - timestamp_error; |
| 298 | |
| 299 | LOGP(DLMGCP, LOGL_NOTICE, |
| 300 | "Corrected timestamp alignment error of %d on 0x%x SSRC: %u " |
| 301 | "new TS offset: %d, " |
| 302 | "from %s:%d in %d\n", |
| 303 | timestamp_error, |
| 304 | ENDPOINT_NUMBER(endp), state->in_stream.ssrc, |
| 305 | state->timestamp_offset, inet_ntoa(addr->sin_addr), |
| 306 | ntohs(addr->sin_port), endp->conn_mode); |
| 307 | } |
| 308 | |
| 309 | OSMO_ASSERT(compute_timestamp_aligment_error(&state->out_stream, ptime, |
| 310 | timestamp + state->timestamp_offset) == 0); |
| 311 | |
| 312 | return timestamp_error; |
| 313 | } |
| 314 | |
| 315 | int mgcp_rtp_processing_default(struct mgcp_endpoint *endp, struct mgcp_rtp_end *dst_end, |
| 316 | char *data, int *len, int buf_size) |
| 317 | { |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | int mgcp_setup_rtp_processing_default(struct mgcp_endpoint *endp, |
| 322 | struct mgcp_rtp_end *dst_end, |
| 323 | struct mgcp_rtp_end *src_end) |
| 324 | { |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | void mgcp_get_net_downlink_format_default(struct mgcp_endpoint *endp, |
| 329 | int *payload_type, |
| 330 | const char**audio_name, |
| 331 | const char**fmtp_extra) |
| 332 | { |
| 333 | /* Use the BTS side parameters when passing the SDP data (for |
| 334 | * downlink) to the net peer. |
| 335 | */ |
| 336 | *payload_type = endp->bts_end.codec.payload_type; |
| 337 | *audio_name = endp->bts_end.codec.audio_name; |
| 338 | *fmtp_extra = endp->bts_end.fmtp_extra; |
| 339 | } |
| 340 | |
| 341 | |
| 342 | void mgcp_rtp_annex_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *state, |
| 343 | const uint16_t seq, const int32_t transit, |
| 344 | const uint32_t ssrc) |
| 345 | { |
| 346 | int32_t d; |
| 347 | |
| 348 | /* initialize or re-initialize */ |
| 349 | if (!state->stats_initialized || state->stats_ssrc != ssrc) { |
| 350 | state->stats_initialized = 1; |
| 351 | state->stats_base_seq = seq; |
| 352 | state->stats_max_seq = seq - 1; |
| 353 | state->stats_ssrc = ssrc; |
| 354 | state->stats_jitter = 0; |
| 355 | state->stats_transit = transit; |
| 356 | state->stats_cycles = 0; |
| 357 | } else { |
| 358 | uint16_t udelta; |
| 359 | |
| 360 | /* |
| 361 | * The below takes the shape of the validation of |
| 362 | * Appendix A. Check if there is something weird with |
| 363 | * the sequence number, otherwise check for a wrap |
| 364 | * around in the sequence number. |
| 365 | * It can't wrap during the initialization so let's |
| 366 | * skip it here. The Appendix A probably doesn't have |
| 367 | * this issue because of the probation. |
| 368 | */ |
| 369 | udelta = seq - state->stats_max_seq; |
| 370 | if (udelta < RTP_MAX_DROPOUT) { |
| 371 | if (seq < state->stats_max_seq) |
| 372 | state->stats_cycles += RTP_SEQ_MOD; |
| 373 | } else if (udelta <= RTP_SEQ_MOD - RTP_MAX_MISORDER) { |
| 374 | LOGP(DLMGCP, LOGL_NOTICE, |
| 375 | "RTP seqno made a very large jump on 0x%x delta: %u\n", |
| 376 | ENDPOINT_NUMBER(endp), udelta); |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Calculate the jitter between the two packages. The TS should be |
| 382 | * taken closer to the read function. This was taken from the |
| 383 | * Appendix A of RFC 3550. Timestamp and arrival_time have a 1/rate |
| 384 | * resolution. |
| 385 | */ |
| 386 | d = transit - state->stats_transit; |
| 387 | state->stats_transit = transit; |
| 388 | if (d < 0) |
| 389 | d = -d; |
| 390 | state->stats_jitter += d - ((state->stats_jitter + 8) >> 4); |
| 391 | state->stats_max_seq = seq; |
| 392 | } |
| 393 | |
| 394 | |
| 395 | |
| 396 | /** |
| 397 | * The RFC 3550 Appendix A assumes there are multiple sources but |
| 398 | * some of the supported endpoints (e.g. the nanoBTS) can only handle |
| 399 | * one source and this code will patch RTP header to appear as if there |
| 400 | * is only one source. |
| 401 | * There is also no probation period for new sources. Every RTP header |
| 402 | * we receive will be seen as a switch in streams. |
| 403 | */ |
| 404 | void mgcp_patch_and_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *state, |
| 405 | struct mgcp_rtp_end *rtp_end, struct sockaddr_in *addr, |
| 406 | char *data, int len) |
| 407 | { |
| 408 | uint32_t arrival_time; |
| 409 | int32_t transit; |
| 410 | uint16_t seq; |
| 411 | uint32_t timestamp, ssrc; |
| 412 | struct rtp_hdr *rtp_hdr; |
| 413 | int payload = rtp_end->codec.payload_type; |
| 414 | |
| 415 | if (len < sizeof(*rtp_hdr)) |
| 416 | return; |
| 417 | |
| 418 | rtp_hdr = (struct rtp_hdr *) data; |
| 419 | seq = ntohs(rtp_hdr->sequence); |
| 420 | timestamp = ntohl(rtp_hdr->timestamp); |
| 421 | arrival_time = get_current_ts(rtp_end->codec.rate); |
| 422 | ssrc = ntohl(rtp_hdr->ssrc); |
| 423 | transit = arrival_time - timestamp; |
| 424 | |
| 425 | mgcp_rtp_annex_count(endp, state, seq, transit, ssrc); |
| 426 | |
| 427 | if (!state->initialized) { |
| 428 | state->initialized = 1; |
| 429 | state->in_stream.last_seq = seq - 1; |
| 430 | state->in_stream.ssrc = state->orig_ssrc = ssrc; |
| 431 | state->in_stream.last_tsdelta = 0; |
| 432 | state->packet_duration = mgcp_rtp_packet_duration(endp, rtp_end); |
| 433 | state->out_stream = state->in_stream; |
| 434 | state->out_stream.last_timestamp = timestamp; |
| 435 | state->out_stream.ssrc = ssrc - 1; /* force output SSRC change */ |
| 436 | LOGP(DLMGCP, LOGL_INFO, |
| 437 | "Initializing stream on 0x%x SSRC: %u timestamp: %u " |
| 438 | "pkt-duration: %d, from %s:%d in %d\n", |
| 439 | ENDPOINT_NUMBER(endp), state->in_stream.ssrc, |
| 440 | state->seq_offset, state->packet_duration, |
| 441 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 442 | endp->conn_mode); |
| 443 | if (state->packet_duration == 0) { |
| 444 | state->packet_duration = rtp_end->codec.rate * 20 / 1000; |
| 445 | LOGP(DLMGCP, LOGL_NOTICE, |
| 446 | "Fixed packet duration is not available on 0x%x, " |
| 447 | "using fixed 20ms instead: %d from %s:%d in %d\n", |
| 448 | ENDPOINT_NUMBER(endp), state->packet_duration, |
| 449 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 450 | endp->conn_mode); |
| 451 | } |
| 452 | } else if (state->in_stream.ssrc != ssrc) { |
| 453 | LOGP(DLMGCP, LOGL_NOTICE, |
| 454 | "The SSRC changed on 0x%x: %u -> %u " |
| 455 | "from %s:%d in %d\n", |
| 456 | ENDPOINT_NUMBER(endp), |
| 457 | state->in_stream.ssrc, rtp_hdr->ssrc, |
| 458 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 459 | endp->conn_mode); |
| 460 | |
| 461 | state->in_stream.ssrc = ssrc; |
| 462 | if (rtp_end->force_constant_ssrc) { |
| 463 | int16_t delta_seq; |
| 464 | |
| 465 | /* Always increment seqno by 1 */ |
| 466 | state->seq_offset = |
| 467 | (state->out_stream.last_seq + 1) - seq; |
| 468 | |
| 469 | /* Estimate number of packets that would have been sent */ |
| 470 | delta_seq = |
| 471 | (arrival_time - state->in_stream.last_arrival_time |
| 472 | + state->packet_duration/2) / |
| 473 | state->packet_duration; |
| 474 | |
| 475 | adjust_rtp_timestamp_offset(endp, state, rtp_end, addr, |
| 476 | delta_seq, timestamp); |
| 477 | |
| 478 | state->patch_ssrc = 1; |
| 479 | ssrc = state->orig_ssrc; |
| 480 | if (rtp_end->force_constant_ssrc != -1) |
| 481 | rtp_end->force_constant_ssrc -= 1; |
| 482 | |
| 483 | LOGP(DLMGCP, LOGL_NOTICE, |
| 484 | "SSRC patching enabled on 0x%x SSRC: %u " |
| 485 | "SeqNo offset: %d, TS offset: %d " |
| 486 | "from %s:%d in %d\n", |
| 487 | ENDPOINT_NUMBER(endp), state->in_stream.ssrc, |
| 488 | state->seq_offset, state->timestamp_offset, |
| 489 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| 490 | endp->conn_mode); |
| 491 | } |
| 492 | |
| 493 | state->in_stream.last_tsdelta = 0; |
| 494 | } else { |
| 495 | /* Compute current per-packet timestamp delta */ |
| 496 | check_rtp_timestamp(endp, state, &state->in_stream, rtp_end, addr, |
| 497 | seq, timestamp, "input", |
| 498 | &state->in_stream.last_tsdelta); |
| 499 | |
| 500 | if (state->patch_ssrc) |
| 501 | ssrc = state->orig_ssrc; |
| 502 | } |
| 503 | |
| 504 | /* Save before patching */ |
| 505 | state->in_stream.last_timestamp = timestamp; |
| 506 | state->in_stream.last_seq = seq; |
| 507 | state->in_stream.last_arrival_time = arrival_time; |
| 508 | |
| 509 | if (rtp_end->force_aligned_timing && |
| 510 | state->out_stream.ssrc == ssrc && state->packet_duration) |
| 511 | /* Align the timestamp offset */ |
| 512 | align_rtp_timestamp_offset(endp, state, rtp_end, addr, timestamp); |
| 513 | |
| 514 | /* Store the updated SSRC back to the packet */ |
| 515 | if (state->patch_ssrc) |
| 516 | rtp_hdr->ssrc = htonl(ssrc); |
| 517 | |
| 518 | /* Apply the offset and store it back to the packet. |
| 519 | * This won't change anything if the offset is 0, so the conditional is |
| 520 | * omitted. */ |
| 521 | seq += state->seq_offset; |
| 522 | rtp_hdr->sequence = htons(seq); |
| 523 | timestamp += state->timestamp_offset; |
| 524 | rtp_hdr->timestamp = htonl(timestamp); |
| 525 | |
| 526 | /* Check again, whether the timestamps are still valid */ |
| 527 | if (state->out_stream.ssrc == ssrc) |
| 528 | check_rtp_timestamp(endp, state, &state->out_stream, rtp_end, |
| 529 | addr, seq, timestamp, "output", |
| 530 | &state->out_stream.last_tsdelta); |
| 531 | |
| 532 | /* Save output values */ |
| 533 | state->out_stream.last_seq = seq; |
| 534 | state->out_stream.last_timestamp = timestamp; |
| 535 | state->out_stream.ssrc = ssrc; |
| 536 | |
| 537 | if (payload < 0) |
| 538 | return; |
| 539 | |
| 540 | #if 0 |
| 541 | DEBUGP(DLMGCP, "Payload hdr payload %u -> endp payload %u\n", |
| 542 | rtp_hdr->payload_type, payload); |
| 543 | rtp_hdr->payload_type = payload; |
| 544 | #endif |
| 545 | } |
| 546 | |
| 547 | /* |
| 548 | * The below code is for dispatching. We have a dedicated port for |
| 549 | * the data coming from the net and one to discover the BTS. |
| 550 | */ |
| 551 | static int forward_data(int fd, struct mgcp_rtp_tap *tap, const char *buf, int len) |
| 552 | { |
| 553 | if (!tap->enabled) |
| 554 | return 0; |
| 555 | |
| 556 | return sendto(fd, buf, len, 0, |
| 557 | (struct sockaddr *)&tap->forward, sizeof(tap->forward)); |
| 558 | } |
| 559 | |
| 560 | static int mgcp_send_transcoder(struct mgcp_rtp_end *end, |
| 561 | struct mgcp_config *cfg, int is_rtp, |
| 562 | const char *buf, int len) |
| 563 | { |
| 564 | int rc; |
| 565 | int port; |
| 566 | struct sockaddr_in addr; |
| 567 | |
| 568 | port = is_rtp ? end->rtp_port : end->rtcp_port; |
| 569 | |
| 570 | addr.sin_family = AF_INET; |
| 571 | addr.sin_addr = cfg->transcoder_in; |
| 572 | addr.sin_port = port; |
| 573 | |
| 574 | rc = sendto(is_rtp ? |
| 575 | end->rtp.fd : |
| 576 | end->rtcp.fd, buf, len, 0, |
| 577 | (struct sockaddr *) &addr, sizeof(addr)); |
| 578 | |
| 579 | if (rc != len) |
| 580 | LOGP(DLMGCP, LOGL_ERROR, |
| 581 | "Failed to send data to the transcoder: %s\n", |
| 582 | strerror(errno)); |
| 583 | |
| 584 | return rc; |
| 585 | } |
| 586 | |
Pau Espin Pedrol | ba61f68 | 2018-05-16 14:03:38 +0200 | [diff] [blame] | 587 | void mgcp_dejitter_udp_send(struct msgb *msg, void *data) |
| 588 | { |
| 589 | struct mgcp_rtp_end *rtp_end = (struct mgcp_rtp_end *) data; |
| 590 | |
| 591 | int rc = mgcp_udp_send(rtp_end->rtp.fd, &rtp_end->addr, |
| 592 | rtp_end->rtp_port, (char*) msg->data, msg->len); |
| 593 | if (rc != msg->len) |
| 594 | LOGP(DLMGCP, LOGL_ERROR, |
| 595 | "Failed to send data after jitter buffer: %d\n", rc); |
| 596 | msgb_free(msg); |
| 597 | } |
| 598 | |
| 599 | static int enqueue_dejitter(struct osmo_jibuf *jb, struct mgcp_rtp_end *rtp_end, char *buf, int len) |
| 600 | { |
| 601 | struct msgb *msg; |
| 602 | msg = msgb_alloc(len, "mgcp-jibuf"); |
| 603 | if (!msg) |
| 604 | return -1; |
| 605 | |
| 606 | memcpy(msg->data, buf, len); |
| 607 | msgb_put(msg, len); |
| 608 | |
| 609 | if (osmo_jibuf_enqueue(jb, msg) < 0) { |
| 610 | rtp_end->dropped_packets += 1; |
| 611 | msgb_free(msg); |
| 612 | } |
| 613 | |
| 614 | return len; |
| 615 | } |
| 616 | |
Neels Hofmeyr | e9920f2 | 2017-07-10 15:07:22 +0200 | [diff] [blame] | 617 | int mgcp_send(struct mgcp_endpoint *endp, int dest, int is_rtp, |
| 618 | struct sockaddr_in *addr, char *buf, int rc) |
| 619 | { |
| 620 | struct mgcp_trunk_config *tcfg = endp->tcfg; |
| 621 | struct mgcp_rtp_end *rtp_end; |
| 622 | struct mgcp_rtp_state *rtp_state; |
| 623 | int tap_idx; |
Pau Espin Pedrol | ba61f68 | 2018-05-16 14:03:38 +0200 | [diff] [blame] | 624 | struct osmo_jibuf *jb; |
Neels Hofmeyr | e9920f2 | 2017-07-10 15:07:22 +0200 | [diff] [blame] | 625 | |
| 626 | LOGP(DLMGCP, LOGL_DEBUG, |
| 627 | "endpoint %x dest %s tcfg->audio_loop %d endp->conn_mode %d (== loopback: %d)\n", |
| 628 | ENDPOINT_NUMBER(endp), |
| 629 | dest == MGCP_DEST_NET? "net" : "bts", |
| 630 | tcfg->audio_loop, |
| 631 | endp->conn_mode, |
| 632 | endp->conn_mode == MGCP_CONN_LOOPBACK); |
| 633 | |
| 634 | /* For loop toggle the destination and then dispatch. */ |
| 635 | if (tcfg->audio_loop) |
| 636 | dest = !dest; |
| 637 | |
| 638 | /* Loop based on the conn_mode, maybe undoing the above */ |
| 639 | if (endp->conn_mode == MGCP_CONN_LOOPBACK) |
| 640 | dest = !dest; |
| 641 | |
| 642 | if (dest == MGCP_DEST_NET) { |
| 643 | rtp_end = &endp->net_end; |
| 644 | rtp_state = &endp->bts_state; |
| 645 | tap_idx = MGCP_TAP_NET_OUT; |
Pau Espin Pedrol | ba61f68 | 2018-05-16 14:03:38 +0200 | [diff] [blame] | 646 | jb = endp->bts_jb; |
Neels Hofmeyr | e9920f2 | 2017-07-10 15:07:22 +0200 | [diff] [blame] | 647 | } else { |
| 648 | rtp_end = &endp->bts_end; |
| 649 | rtp_state = &endp->net_state; |
| 650 | tap_idx = MGCP_TAP_BTS_OUT; |
Pau Espin Pedrol | ba61f68 | 2018-05-16 14:03:38 +0200 | [diff] [blame] | 651 | jb = NULL; |
Neels Hofmeyr | e9920f2 | 2017-07-10 15:07:22 +0200 | [diff] [blame] | 652 | } |
| 653 | LOGP(DLMGCP, LOGL_DEBUG, |
| 654 | "endpoint %x dest %s net_end %s %d %d bts_end %s %d %d rtp_end %s %d %d\n", |
| 655 | ENDPOINT_NUMBER(endp), |
| 656 | dest == MGCP_DEST_NET? "net" : "bts", |
| 657 | |
| 658 | inet_ntoa(endp->net_end.addr), |
| 659 | ntohs(endp->net_end.rtp_port), |
| 660 | ntohs(endp->net_end.rtcp_port), |
| 661 | |
| 662 | inet_ntoa(endp->bts_end.addr), |
| 663 | ntohs(endp->bts_end.rtp_port), |
| 664 | ntohs(endp->bts_end.rtcp_port), |
| 665 | |
| 666 | inet_ntoa(rtp_end->addr), |
| 667 | ntohs(rtp_end->rtp_port), |
| 668 | ntohs(rtp_end->rtcp_port) |
| 669 | ); |
| 670 | |
| 671 | if (!rtp_end->output_enabled) { |
| 672 | rtp_end->dropped_packets += 1; |
| 673 | LOGP(DLMGCP, LOGL_DEBUG, |
| 674 | "endpoint %x output disabled, drop to %s %s %d %d\n", |
| 675 | ENDPOINT_NUMBER(endp), |
| 676 | dest == MGCP_DEST_NET? "net" : "bts", |
| 677 | inet_ntoa(rtp_end->addr), |
| 678 | ntohs(rtp_end->rtp_port), |
| 679 | ntohs(rtp_end->rtcp_port) |
| 680 | ); |
| 681 | } else if (is_rtp) { |
| 682 | int cont; |
| 683 | int nbytes = 0; |
| 684 | int len = rc; |
| 685 | do { |
| 686 | cont = endp->cfg->rtp_processing_cb(endp, rtp_end, |
| 687 | buf, &len, RTP_BUF_SIZE); |
| 688 | if (cont < 0) |
| 689 | break; |
| 690 | |
| 691 | mgcp_patch_and_count(endp, rtp_state, rtp_end, addr, buf, len); |
| 692 | LOGP(DLMGCP, LOGL_DEBUG, |
| 693 | "endpoint %x process/send to %s %s %d %d\n", |
| 694 | ENDPOINT_NUMBER(endp), |
| 695 | (dest == MGCP_DEST_NET)? "net" : "bts", |
| 696 | inet_ntoa(rtp_end->addr), |
| 697 | ntohs(rtp_end->rtp_port), |
| 698 | ntohs(rtp_end->rtcp_port) |
| 699 | ); |
| 700 | forward_data(rtp_end->rtp.fd, &endp->taps[tap_idx], |
| 701 | buf, len); |
| 702 | |
| 703 | /* FIXME: HACK HACK HACK. See OS#2459. |
| 704 | * The ip.access nano3G needs the first RTP payload's first two bytes to read hex |
| 705 | * 'e400', or it will reject the RAB assignment. It seems to not harm other femto |
| 706 | * cells (as long as we patch only the first RTP payload in each stream). |
| 707 | */ |
| 708 | if (tap_idx == MGCP_TAP_BTS_OUT |
| 709 | && !rtp_state->patched_first_rtp_payload) { |
| 710 | uint8_t *data = (uint8_t*)&buf[12]; |
| 711 | data[0] = 0xe4; |
| 712 | data[1] = 0x00; |
| 713 | rtp_state->patched_first_rtp_payload = true; |
| 714 | } |
| 715 | |
Pau Espin Pedrol | ba61f68 | 2018-05-16 14:03:38 +0200 | [diff] [blame] | 716 | if (jb) |
| 717 | rc = enqueue_dejitter(jb, rtp_end, buf, len); |
| 718 | else |
| 719 | rc = mgcp_udp_send(rtp_end->rtp.fd, |
| 720 | &rtp_end->addr, |
| 721 | rtp_end->rtp_port, buf, len); |
Neels Hofmeyr | e9920f2 | 2017-07-10 15:07:22 +0200 | [diff] [blame] | 722 | |
| 723 | if (rc <= 0) |
| 724 | return rc; |
| 725 | nbytes += rc; |
| 726 | len = cont; |
| 727 | } while (len > 0); |
| 728 | return nbytes; |
| 729 | } else if (!tcfg->omit_rtcp) { |
| 730 | LOGP(DLMGCP, LOGL_DEBUG, |
| 731 | "endpoint %x send to %s %s %d %d\n", |
| 732 | ENDPOINT_NUMBER(endp), |
| 733 | dest == MGCP_DEST_NET? "net" : "bts", |
| 734 | inet_ntoa(rtp_end->addr), |
| 735 | ntohs(rtp_end->rtp_port), |
| 736 | ntohs(rtp_end->rtcp_port) |
| 737 | ); |
| 738 | |
| 739 | return mgcp_udp_send(rtp_end->rtcp.fd, |
| 740 | &rtp_end->addr, |
| 741 | rtp_end->rtcp_port, buf, rc); |
| 742 | } |
| 743 | |
| 744 | return 0; |
| 745 | } |
| 746 | |
| 747 | static int receive_from(struct mgcp_endpoint *endp, int fd, struct sockaddr_in *addr, |
| 748 | char *buf, int bufsize) |
| 749 | { |
| 750 | int rc; |
| 751 | socklen_t slen = sizeof(*addr); |
| 752 | |
| 753 | rc = recvfrom(fd, buf, bufsize, 0, |
| 754 | (struct sockaddr *) addr, &slen); |
| 755 | if (rc < 0) { |
| 756 | LOGP(DLMGCP, LOGL_ERROR, "Failed to receive message on: 0x%x errno: %d/%s\n", |
| 757 | ENDPOINT_NUMBER(endp), errno, strerror(errno)); |
| 758 | return -1; |
| 759 | } |
| 760 | |
| 761 | /* do not forward aynthing... maybe there is a packet from the bts */ |
| 762 | if (!endp->allocated) |
| 763 | return -1; |
| 764 | |
| 765 | #warning "Slight spec violation. With connection mode recvonly we should attempt to forward." |
| 766 | |
| 767 | return rc; |
| 768 | } |
| 769 | |
| 770 | static int rtp_data_net(struct osmo_fd *fd, unsigned int what) |
| 771 | { |
| 772 | char buf[RTP_BUF_SIZE]; |
| 773 | struct sockaddr_in addr; |
| 774 | struct mgcp_endpoint *endp; |
| 775 | int rc, proto; |
| 776 | |
| 777 | endp = (struct mgcp_endpoint *) fd->data; |
| 778 | |
| 779 | rc = receive_from(endp, fd->fd, &addr, buf, sizeof(buf)); |
| 780 | if (rc <= 0) |
| 781 | return -1; |
| 782 | |
| 783 | LOGP(DLMGCP, LOGL_DEBUG, |
| 784 | "endpoint %x", |
| 785 | ENDPOINT_NUMBER(endp)); |
| 786 | LOGPC(DLMGCP, LOGL_DEBUG, |
| 787 | " from net %s %d", |
| 788 | inet_ntoa(addr.sin_addr), |
| 789 | ntohs(addr.sin_port)); |
| 790 | LOGPC(DLMGCP, LOGL_DEBUG, |
| 791 | " net_end %s %d %d", |
| 792 | inet_ntoa(endp->net_end.addr), |
| 793 | ntohs(endp->net_end.rtp_port), |
| 794 | ntohs(endp->net_end.rtcp_port)); |
| 795 | LOGPC(DLMGCP, LOGL_DEBUG, |
| 796 | " bts_end %s %d %d\n", |
| 797 | inet_ntoa(endp->bts_end.addr), |
| 798 | ntohs(endp->bts_end.rtp_port), |
| 799 | ntohs(endp->bts_end.rtcp_port) |
| 800 | ); |
| 801 | |
| 802 | if (memcmp(&addr.sin_addr, &endp->net_end.addr, sizeof(addr.sin_addr)) != 0) { |
| 803 | LOGP(DLMGCP, LOGL_ERROR, |
| 804 | "rtp_data_net: Endpoint 0x%x data from wrong address %s vs. ", |
| 805 | ENDPOINT_NUMBER(endp), inet_ntoa(addr.sin_addr)); |
| 806 | LOGPC(DLMGCP, LOGL_ERROR, |
| 807 | "%s\n", inet_ntoa(endp->net_end.addr)); |
| 808 | return -1; |
| 809 | } |
| 810 | |
| 811 | switch(endp->type) { |
| 812 | case MGCP_RTP_DEFAULT: |
| 813 | case MGCP_RTP_TRANSCODED: |
| 814 | if (endp->net_end.rtp_port != addr.sin_port && |
| 815 | endp->net_end.rtcp_port != addr.sin_port) { |
| 816 | LOGP(DLMGCP, LOGL_ERROR, |
| 817 | "rtp_data_net: Data from wrong source port %d on 0x%x\n", |
| 818 | ntohs(addr.sin_port), ENDPOINT_NUMBER(endp)); |
| 819 | return -1; |
| 820 | } |
| 821 | break; |
| 822 | case MGCP_OSMUX_BSC: |
| 823 | case MGCP_OSMUX_BSC_NAT: |
| 824 | break; |
| 825 | } |
| 826 | |
| 827 | LOGP(DLMGCP, LOGL_DEBUG, |
| 828 | "rtp_data_net: Endpoint %x data from %s %d\n", |
| 829 | ENDPOINT_NUMBER(endp), |
| 830 | inet_ntoa(addr.sin_addr), |
| 831 | ntohs(addr.sin_port)); |
| 832 | |
| 833 | /* throw away the dummy message */ |
| 834 | if (rc == 1 && buf[0] == MGCP_DUMMY_LOAD) { |
| 835 | LOGP(DLMGCP, LOGL_NOTICE, "Filtered dummy from network on 0x%x\n", |
| 836 | ENDPOINT_NUMBER(endp)); |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | proto = fd == &endp->net_end.rtp ? MGCP_PROTO_RTP : MGCP_PROTO_RTCP; |
| 841 | endp->net_end.packets += 1; |
| 842 | endp->net_end.octets += rc; |
| 843 | |
| 844 | forward_data(fd->fd, &endp->taps[MGCP_TAP_NET_IN], buf, rc); |
| 845 | |
| 846 | switch (endp->type) { |
| 847 | case MGCP_RTP_DEFAULT: |
| 848 | return mgcp_send(endp, MGCP_DEST_BTS, proto == MGCP_PROTO_RTP, |
| 849 | &addr, buf, rc); |
| 850 | case MGCP_RTP_TRANSCODED: |
| 851 | return mgcp_send_transcoder(&endp->trans_net, endp->cfg, |
| 852 | proto == MGCP_PROTO_RTP, buf, rc); |
| 853 | case MGCP_OSMUX_BSC_NAT: |
| 854 | return osmux_xfrm_to_osmux(MGCP_DEST_BTS, buf, rc, endp); |
| 855 | case MGCP_OSMUX_BSC: /* Should not happen */ |
| 856 | break; |
| 857 | } |
| 858 | |
| 859 | LOGP(DLMGCP, LOGL_ERROR, "Bad MGCP type %u on endpoint %u\n", |
| 860 | endp->type, ENDPOINT_NUMBER(endp)); |
| 861 | return 0; |
| 862 | } |
| 863 | |
| 864 | static void discover_bts(struct mgcp_endpoint *endp, int proto, struct sockaddr_in *addr) |
| 865 | { |
| 866 | struct mgcp_config *cfg = endp->cfg; |
| 867 | |
| 868 | if (proto == MGCP_PROTO_RTP && endp->bts_end.rtp_port == 0) { |
| 869 | if (!cfg->bts_ip || |
| 870 | memcmp(&addr->sin_addr, |
| 871 | &cfg->bts_in, sizeof(cfg->bts_in)) == 0 || |
| 872 | memcmp(&addr->sin_addr, |
| 873 | &endp->bts_end.addr, sizeof(endp->bts_end.addr)) == 0) { |
| 874 | |
| 875 | endp->bts_end.rtp_port = addr->sin_port; |
| 876 | endp->bts_end.addr = addr->sin_addr; |
| 877 | |
| 878 | LOGP(DLMGCP, LOGL_NOTICE, |
| 879 | "Found BTS for endpoint: 0x%x on port: %d/%d of %s\n", |
| 880 | ENDPOINT_NUMBER(endp), ntohs(endp->bts_end.rtp_port), |
| 881 | ntohs(endp->bts_end.rtcp_port), inet_ntoa(addr->sin_addr)); |
| 882 | } |
| 883 | } else if (proto == MGCP_PROTO_RTCP && endp->bts_end.rtcp_port == 0) { |
| 884 | if (memcmp(&endp->bts_end.addr, &addr->sin_addr, |
| 885 | sizeof(endp->bts_end.addr)) == 0) { |
| 886 | endp->bts_end.rtcp_port = addr->sin_port; |
| 887 | } |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | static int rtp_data_bts(struct osmo_fd *fd, unsigned int what) |
| 892 | { |
| 893 | char buf[RTP_BUF_SIZE]; |
| 894 | struct sockaddr_in addr; |
| 895 | struct mgcp_endpoint *endp; |
| 896 | int rc, proto; |
| 897 | |
| 898 | endp = (struct mgcp_endpoint *) fd->data; |
| 899 | |
| 900 | rc = receive_from(endp, fd->fd, &addr, buf, sizeof(buf)); |
| 901 | if (rc <= 0) |
| 902 | return -1; |
| 903 | |
| 904 | proto = fd == &endp->bts_end.rtp ? MGCP_PROTO_RTP : MGCP_PROTO_RTCP; |
| 905 | |
| 906 | /* We have no idea who called us, maybe it is the BTS. */ |
| 907 | /* it was the BTS... */ |
| 908 | discover_bts(endp, proto, &addr); |
| 909 | |
| 910 | if (memcmp(&endp->bts_end.addr, &addr.sin_addr, sizeof(addr.sin_addr)) != 0) { |
| 911 | LOGP(DLMGCP, LOGL_ERROR, |
| 912 | "rtp_data_bts: Data from wrong bts %s on 0x%x\n", |
| 913 | inet_ntoa(addr.sin_addr), ENDPOINT_NUMBER(endp)); |
| 914 | return -1; |
| 915 | } |
| 916 | |
| 917 | if (endp->bts_end.rtp_port != addr.sin_port && |
| 918 | endp->bts_end.rtcp_port != addr.sin_port) { |
| 919 | LOGP(DLMGCP, LOGL_ERROR, |
| 920 | "rtp_data_bts: ata from wrong bts source port %d on 0x%x\n", |
| 921 | ntohs(addr.sin_port), ENDPOINT_NUMBER(endp)); |
| 922 | return -1; |
| 923 | } |
| 924 | |
| 925 | LOGP(DLMGCP, LOGL_DEBUG, |
| 926 | "rtp_data_bts: Endpoint %x data from %s %d\n", |
| 927 | ENDPOINT_NUMBER(endp), |
| 928 | inet_ntoa(addr.sin_addr), |
| 929 | ntohs(addr.sin_port)); |
| 930 | |
| 931 | /* throw away the dummy message */ |
| 932 | if (rc == 1 && buf[0] == MGCP_DUMMY_LOAD) { |
| 933 | LOGP(DLMGCP, LOGL_NOTICE, "Filtered dummy from bts on 0x%x\n", |
| 934 | ENDPOINT_NUMBER(endp)); |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | /* do this before the loop handling */ |
| 939 | endp->bts_end.packets += 1; |
| 940 | endp->bts_end.octets += rc; |
| 941 | |
| 942 | forward_data(fd->fd, &endp->taps[MGCP_TAP_BTS_IN], buf, rc); |
| 943 | |
| 944 | switch (endp->type) { |
| 945 | case MGCP_RTP_DEFAULT: |
| 946 | LOGP(DLMGCP, LOGL_DEBUG, |
| 947 | "rtp_data_bts: Endpoint %x MGCP_RTP_DEFAULT\n", |
| 948 | ENDPOINT_NUMBER(endp)); |
| 949 | return mgcp_send(endp, MGCP_DEST_NET, proto == MGCP_PROTO_RTP, |
| 950 | &addr, buf, rc); |
| 951 | case MGCP_RTP_TRANSCODED: |
| 952 | return mgcp_send_transcoder(&endp->trans_bts, endp->cfg, |
| 953 | proto == MGCP_PROTO_RTP, buf, rc); |
| 954 | case MGCP_OSMUX_BSC: |
| 955 | /* OSMUX translation: BTS -> BSC */ |
| 956 | return osmux_xfrm_to_osmux(MGCP_DEST_NET, buf, rc, endp); |
| 957 | case MGCP_OSMUX_BSC_NAT: |
| 958 | break; /* Should not happen */ |
| 959 | } |
| 960 | |
| 961 | LOGP(DLMGCP, LOGL_ERROR, "Bad MGCP type %u on endpoint %u\n", |
| 962 | endp->type, ENDPOINT_NUMBER(endp)); |
| 963 | return 0; |
| 964 | } |
| 965 | |
| 966 | static int rtp_data_transcoder(struct mgcp_rtp_end *end, struct mgcp_endpoint *_endp, |
| 967 | int dest, struct osmo_fd *fd) |
| 968 | { |
| 969 | char buf[RTP_BUF_SIZE]; |
| 970 | struct sockaddr_in addr; |
| 971 | struct mgcp_config *cfg; |
| 972 | int rc, proto; |
| 973 | |
| 974 | cfg = _endp->cfg; |
| 975 | rc = receive_from(_endp, fd->fd, &addr, buf, sizeof(buf)); |
| 976 | if (rc <= 0) |
| 977 | return -1; |
| 978 | |
| 979 | proto = fd == &end->rtp ? MGCP_PROTO_RTP : MGCP_PROTO_RTCP; |
| 980 | |
| 981 | if (memcmp(&addr.sin_addr, &cfg->transcoder_in, sizeof(addr.sin_addr)) != 0) { |
| 982 | LOGP(DLMGCP, LOGL_ERROR, |
| 983 | "Data not coming from transcoder dest: %d %s on 0x%x\n", |
| 984 | dest, inet_ntoa(addr.sin_addr), ENDPOINT_NUMBER(_endp)); |
| 985 | return -1; |
| 986 | } |
| 987 | |
| 988 | if (end->rtp_port != addr.sin_port && |
| 989 | end->rtcp_port != addr.sin_port) { |
| 990 | LOGP(DLMGCP, LOGL_ERROR, |
| 991 | "Data from wrong transcoder dest %d source port %d on 0x%x\n", |
| 992 | dest, ntohs(addr.sin_port), ENDPOINT_NUMBER(_endp)); |
| 993 | return -1; |
| 994 | } |
| 995 | |
| 996 | /* throw away the dummy message */ |
| 997 | if (rc == 1 && buf[0] == MGCP_DUMMY_LOAD) { |
| 998 | LOGP(DLMGCP, LOGL_NOTICE, "Filtered dummy from transcoder dest %d on 0x%x\n", |
| 999 | dest, ENDPOINT_NUMBER(_endp)); |
| 1000 | return 0; |
| 1001 | } |
| 1002 | |
| 1003 | end->packets += 1; |
| 1004 | return mgcp_send(_endp, dest, proto == MGCP_PROTO_RTP, &addr, buf, rc); |
| 1005 | } |
| 1006 | |
| 1007 | static int rtp_data_trans_net(struct osmo_fd *fd, unsigned int what) |
| 1008 | { |
| 1009 | struct mgcp_endpoint *endp; |
| 1010 | endp = (struct mgcp_endpoint *) fd->data; |
| 1011 | |
| 1012 | return rtp_data_transcoder(&endp->trans_net, endp, MGCP_DEST_NET, fd); |
| 1013 | } |
| 1014 | |
| 1015 | static int rtp_data_trans_bts(struct osmo_fd *fd, unsigned int what) |
| 1016 | { |
| 1017 | struct mgcp_endpoint *endp; |
| 1018 | endp = (struct mgcp_endpoint *) fd->data; |
| 1019 | |
| 1020 | return rtp_data_transcoder(&endp->trans_bts, endp, MGCP_DEST_BTS, fd); |
| 1021 | } |
| 1022 | |
| 1023 | int mgcp_create_bind(const char *source_addr, struct osmo_fd *fd, int port) |
| 1024 | { |
| 1025 | struct sockaddr_in addr; |
| 1026 | int on = 1; |
| 1027 | |
| 1028 | fd->fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 1029 | if (fd->fd < 0) { |
| 1030 | LOGP(DLMGCP, LOGL_ERROR, "Failed to create UDP port.\n"); |
| 1031 | return -1; |
| 1032 | } |
| 1033 | |
| 1034 | setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 1035 | memset(&addr, 0, sizeof(addr)); |
| 1036 | addr.sin_family = AF_INET; |
| 1037 | addr.sin_port = htons(port); |
| 1038 | inet_aton(source_addr, &addr.sin_addr); |
| 1039 | |
| 1040 | if (bind(fd->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 1041 | close(fd->fd); |
| 1042 | fd->fd = -1; |
| 1043 | return -1; |
| 1044 | } |
| 1045 | |
| 1046 | return 0; |
| 1047 | } |
| 1048 | |
| 1049 | int mgcp_set_ip_tos(int fd, int tos) |
| 1050 | { |
| 1051 | int ret; |
| 1052 | ret = setsockopt(fd, IPPROTO_IP, IP_TOS, |
| 1053 | &tos, sizeof(tos)); |
| 1054 | return ret != 0; |
| 1055 | } |
| 1056 | |
| 1057 | static int bind_rtp(struct mgcp_config *cfg, const char *source_addr, |
| 1058 | struct mgcp_rtp_end *rtp_end, int endpno) |
| 1059 | { |
| 1060 | if (mgcp_create_bind(source_addr, &rtp_end->rtp, |
| 1061 | rtp_end->local_port) != 0) { |
| 1062 | LOGP(DLMGCP, LOGL_ERROR, "Failed to create RTP port: %s:%d on 0x%x\n", |
| 1063 | source_addr, rtp_end->local_port, endpno); |
| 1064 | goto cleanup0; |
| 1065 | } |
| 1066 | |
| 1067 | if (mgcp_create_bind(source_addr, &rtp_end->rtcp, |
| 1068 | rtp_end->local_port + 1) != 0) { |
| 1069 | LOGP(DLMGCP, LOGL_ERROR, "Failed to create RTCP port: %s:%d on 0x%x\n", |
| 1070 | source_addr, rtp_end->local_port + 1, endpno); |
| 1071 | goto cleanup1; |
| 1072 | } |
| 1073 | |
| 1074 | mgcp_set_ip_tos(rtp_end->rtp.fd, cfg->endp_dscp); |
| 1075 | mgcp_set_ip_tos(rtp_end->rtcp.fd, cfg->endp_dscp); |
| 1076 | |
| 1077 | rtp_end->rtp.when = BSC_FD_READ; |
| 1078 | if (osmo_fd_register(&rtp_end->rtp) != 0) { |
| 1079 | LOGP(DLMGCP, LOGL_ERROR, "Failed to register RTP port %d on 0x%x\n", |
| 1080 | rtp_end->local_port, endpno); |
| 1081 | goto cleanup2; |
| 1082 | } |
| 1083 | |
| 1084 | rtp_end->rtcp.when = BSC_FD_READ; |
| 1085 | if (osmo_fd_register(&rtp_end->rtcp) != 0) { |
| 1086 | LOGP(DLMGCP, LOGL_ERROR, "Failed to register RTCP port %d on 0x%x\n", |
| 1087 | rtp_end->local_port + 1, endpno); |
| 1088 | goto cleanup3; |
| 1089 | } |
| 1090 | |
| 1091 | return 0; |
| 1092 | |
| 1093 | cleanup3: |
| 1094 | osmo_fd_unregister(&rtp_end->rtp); |
| 1095 | cleanup2: |
| 1096 | close(rtp_end->rtcp.fd); |
| 1097 | rtp_end->rtcp.fd = -1; |
| 1098 | cleanup1: |
| 1099 | close(rtp_end->rtp.fd); |
| 1100 | rtp_end->rtp.fd = -1; |
| 1101 | cleanup0: |
| 1102 | return -1; |
| 1103 | } |
| 1104 | |
| 1105 | static int int_bind(const char *port, |
| 1106 | struct mgcp_rtp_end *end, int (*cb)(struct osmo_fd *, unsigned), |
| 1107 | struct mgcp_endpoint *_endp, |
| 1108 | const char *source_addr, int rtp_port) |
| 1109 | { |
| 1110 | if (end->rtp.fd != -1 || end->rtcp.fd != -1) { |
| 1111 | LOGP(DLMGCP, LOGL_ERROR, "Previous %s was still bound on %d\n", |
| 1112 | port, ENDPOINT_NUMBER(_endp)); |
| 1113 | mgcp_free_rtp_port(end); |
| 1114 | } |
| 1115 | |
| 1116 | end->local_port = rtp_port; |
| 1117 | end->rtp.cb = cb; |
| 1118 | end->rtp.data = _endp; |
| 1119 | end->rtcp.data = _endp; |
| 1120 | end->rtcp.cb = cb; |
| 1121 | return bind_rtp(_endp->cfg, source_addr, end, ENDPOINT_NUMBER(_endp)); |
| 1122 | } |
| 1123 | |
| 1124 | int mgcp_bind_bts_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| 1125 | { |
| 1126 | return int_bind("bts-port", &endp->bts_end, |
| 1127 | rtp_data_bts, endp, |
| 1128 | mgcp_bts_src_addr(endp), rtp_port); |
| 1129 | } |
| 1130 | |
| 1131 | int mgcp_bind_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| 1132 | { |
| 1133 | return int_bind("net-port", &endp->net_end, |
| 1134 | rtp_data_net, endp, |
| 1135 | mgcp_net_src_addr(endp), rtp_port); |
| 1136 | } |
| 1137 | |
| 1138 | int mgcp_bind_trans_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| 1139 | { |
| 1140 | return int_bind("trans-net", &endp->trans_net, |
| 1141 | rtp_data_trans_net, endp, |
| 1142 | endp->cfg->source_addr, rtp_port); |
| 1143 | } |
| 1144 | |
| 1145 | int mgcp_bind_trans_bts_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| 1146 | { |
| 1147 | return int_bind("trans-bts", &endp->trans_bts, |
| 1148 | rtp_data_trans_bts, endp, |
| 1149 | endp->cfg->source_addr, rtp_port); |
| 1150 | } |
| 1151 | |
| 1152 | int mgcp_free_rtp_port(struct mgcp_rtp_end *end) |
| 1153 | { |
| 1154 | if (end->rtp.fd != -1) { |
| 1155 | close(end->rtp.fd); |
| 1156 | end->rtp.fd = -1; |
| 1157 | osmo_fd_unregister(&end->rtp); |
| 1158 | } |
| 1159 | |
| 1160 | if (end->rtcp.fd != -1) { |
| 1161 | close(end->rtcp.fd); |
| 1162 | end->rtcp.fd = -1; |
| 1163 | osmo_fd_unregister(&end->rtcp); |
| 1164 | } |
| 1165 | |
| 1166 | return 0; |
| 1167 | } |
| 1168 | |
| 1169 | |
| 1170 | void mgcp_state_calc_loss(struct mgcp_rtp_state *state, |
| 1171 | struct mgcp_rtp_end *end, uint32_t *expected, |
| 1172 | int *loss) |
| 1173 | { |
| 1174 | *expected = state->stats_cycles + state->stats_max_seq; |
| 1175 | *expected = *expected - state->stats_base_seq + 1; |
| 1176 | |
| 1177 | if (!state->stats_initialized) { |
| 1178 | *expected = 0; |
| 1179 | *loss = 0; |
| 1180 | return; |
| 1181 | } |
| 1182 | |
| 1183 | /* |
| 1184 | * Make sure the sign is correct and use the biggest |
| 1185 | * positive/negative number that fits. |
| 1186 | */ |
| 1187 | *loss = *expected - end->packets; |
| 1188 | if (*expected < end->packets) { |
| 1189 | if (*loss > 0) |
| 1190 | *loss = INT_MIN; |
| 1191 | } else { |
| 1192 | if (*loss < 0) |
| 1193 | *loss = INT_MAX; |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | uint32_t mgcp_state_calc_jitter(struct mgcp_rtp_state *state) |
| 1198 | { |
| 1199 | if (!state->stats_initialized) |
| 1200 | return 0; |
| 1201 | return state->stats_jitter >> 4; |
| 1202 | } |