| /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| /* The protocol implementation */ |
| |
| /* |
| * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009-2012 by On-Waves |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero General Public License as published by |
| * the Free Software Foundation; either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <string.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <time.h> |
| #include <limits.h> |
| |
| #include <sys/socket.h> |
| #include <arpa/inet.h> |
| |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/select.h> |
| |
| #include <osmocom/netif/rtp.h> |
| |
| #include <openbsc/mgcp.h> |
| #include <openbsc/mgcp_internal.h> |
| |
| #include <openbsc/osmux.h> |
| |
| #warning "Make use of the rtp proxy code" |
| |
| |
| #define RTP_SEQ_MOD (1 << 16) |
| #define RTP_MAX_DROPOUT 3000 |
| #define RTP_MAX_MISORDER 100 |
| #define RTP_BUF_SIZE 4096 |
| |
| enum { |
| MGCP_PROTO_RTP, |
| MGCP_PROTO_RTCP, |
| }; |
| |
| /** |
| * This does not need to be a precision timestamp and |
| * is allowed to wrap quite fast. The returned value is |
| * 1/unit seconds. |
| */ |
| static uint32_t get_current_ts(unsigned unit) |
| { |
| struct timespec tp; |
| uint64_t ret; |
| |
| if (!unit) |
| return 0; |
| |
| memset(&tp, 0, sizeof(tp)); |
| if (clock_gettime(CLOCK_MONOTONIC, &tp) != 0) |
| LOGP(DMGCP, LOGL_NOTICE, |
| "Getting the clock failed.\n"); |
| |
| /* convert it to 1/unit seconds */ |
| ret = tp.tv_sec; |
| ret *= unit; |
| ret += (int64_t)tp.tv_nsec * unit / 1000 / 1000 / 1000; |
| |
| return ret; |
| } |
| |
| int mgcp_udp_send(int fd, struct in_addr *addr, int port, char *buf, int len) |
| { |
| struct sockaddr_in out; |
| out.sin_family = AF_INET; |
| out.sin_port = port; |
| memcpy(&out.sin_addr, addr, sizeof(*addr)); |
| |
| return sendto(fd, buf, len, 0, (struct sockaddr *)&out, sizeof(out)); |
| } |
| |
| int mgcp_send_dummy(struct mgcp_endpoint *endp) |
| { |
| static char buf[] = { MGCP_DUMMY_LOAD }; |
| int rc; |
| int was_rtcp = 0; |
| |
| rc = mgcp_udp_send(endp->net_end.rtp.fd, &endp->net_end.addr, |
| endp->net_end.rtp_port, buf, 1); |
| |
| if (rc == -1) |
| goto failed; |
| |
| if (endp->tcfg->omit_rtcp) |
| return rc; |
| |
| was_rtcp = 1; |
| rc = mgcp_udp_send(endp->net_end.rtcp.fd, &endp->net_end.addr, |
| endp->net_end.rtcp_port, buf, 1); |
| |
| if (rc >= 0) |
| return rc; |
| |
| failed: |
| LOGP(DMGCP, LOGL_ERROR, |
| "Failed to send dummy %s packet: %s on: 0x%x to %s:%d\n", |
| was_rtcp ? "RTCP" : "RTP", |
| strerror(errno), ENDPOINT_NUMBER(endp), inet_ntoa(endp->net_end.addr), |
| was_rtcp ? endp->net_end.rtcp_port : endp->net_end.rtp_port); |
| |
| return -1; |
| } |
| |
| static int32_t compute_timestamp_aligment_error(struct mgcp_rtp_stream_state *sstate, |
| int ptime, uint32_t timestamp) |
| { |
| int32_t timestamp_delta; |
| |
| if (ptime == 0) |
| return 0; |
| |
| /* Align according to: T - Tlast = k * Tptime */ |
| timestamp_delta = timestamp - sstate->last_timestamp; |
| |
| return timestamp_delta % ptime; |
| } |
| |
| static int check_rtp_timestamp(struct mgcp_endpoint *endp, |
| struct mgcp_rtp_state *state, |
| struct mgcp_rtp_stream_state *sstate, |
| struct mgcp_rtp_end *rtp_end, |
| struct sockaddr_in *addr, |
| uint16_t seq, uint32_t timestamp, |
| const char *text, int32_t *tsdelta_out) |
| { |
| int32_t tsdelta; |
| int32_t timestamp_error; |
| |
| /* Not fully intialized, skip */ |
| if (sstate->last_tsdelta == 0 && timestamp == sstate->last_timestamp) |
| return 0; |
| |
| if (seq == sstate->last_seq) { |
| if (timestamp != sstate->last_timestamp) { |
| sstate->err_ts_counter += 1; |
| LOGP(DMGCP, LOGL_ERROR, |
| "The %s timestamp delta is != 0 but the sequence " |
| "number %d is the same, " |
| "TS offset: %d, SeqNo offset: %d " |
| "on 0x%x SSRC: %u timestamp: %u " |
| "from %s:%d in %d\n", |
| text, seq, |
| state->timestamp_offset, state->seq_offset, |
| ENDPOINT_NUMBER(endp), sstate->ssrc, timestamp, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| } |
| return 0; |
| } |
| |
| tsdelta = |
| (int32_t)(timestamp - sstate->last_timestamp) / |
| (int16_t)(seq - sstate->last_seq); |
| |
| if (tsdelta == 0) { |
| /* Don't update *tsdelta_out */ |
| LOGP(DMGCP, LOGL_NOTICE, |
| "The %s timestamp delta is %d " |
| "on 0x%x SSRC: %u timestamp: %u " |
| "from %s:%d in %d\n", |
| text, tsdelta, |
| ENDPOINT_NUMBER(endp), sstate->ssrc, timestamp, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| |
| return 0; |
| } |
| |
| if (sstate->last_tsdelta != tsdelta) { |
| if (sstate->last_tsdelta) { |
| LOGP(DMGCP, LOGL_INFO, |
| "The %s timestamp delta changes from %d to %d " |
| "on 0x%x SSRC: %u timestamp: %u from %s:%d in %d\n", |
| text, sstate->last_tsdelta, tsdelta, |
| ENDPOINT_NUMBER(endp), sstate->ssrc, timestamp, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| } |
| } |
| |
| if (tsdelta_out) |
| *tsdelta_out = tsdelta; |
| |
| timestamp_error = |
| compute_timestamp_aligment_error(sstate, state->packet_duration, |
| timestamp); |
| |
| if (timestamp_error) { |
| sstate->err_ts_counter += 1; |
| LOGP(DMGCP, LOGL_NOTICE, |
| "The %s timestamp has an alignment error of %d " |
| "on 0x%x SSRC: %u " |
| "SeqNo delta: %d, TS delta: %d, dTS/dSeq: %d " |
| "from %s:%d in mode %d. ptime: %d\n", |
| text, timestamp_error, |
| ENDPOINT_NUMBER(endp), sstate->ssrc, |
| (int16_t)(seq - sstate->last_seq), |
| (int32_t)(timestamp - sstate->last_timestamp), |
| tsdelta, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode, state->packet_duration); |
| } |
| return 1; |
| } |
| |
| /* Set the timestamp offset according to the packet duration. */ |
| static int adjust_rtp_timestamp_offset(struct mgcp_endpoint *endp, |
| struct mgcp_rtp_state *state, |
| struct mgcp_rtp_end *rtp_end, |
| struct sockaddr_in *addr, |
| int16_t delta_seq, uint32_t in_timestamp) |
| { |
| int32_t tsdelta = state->packet_duration; |
| int timestamp_offset; |
| uint32_t out_timestamp; |
| |
| if (tsdelta == 0) { |
| tsdelta = state->out_stream.last_tsdelta; |
| if (tsdelta != 0) { |
| LOGP(DMGCP, LOGL_NOTICE, |
| "A fixed packet duration is not available on 0x%x, " |
| "using last output timestamp delta instead: %d " |
| "from %s:%d in %d\n", |
| ENDPOINT_NUMBER(endp), tsdelta, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| } else { |
| tsdelta = rtp_end->codec.rate * 20 / 1000; |
| LOGP(DMGCP, LOGL_NOTICE, |
| "Fixed packet duration and last timestamp delta " |
| "are not available on 0x%x, " |
| "using fixed 20ms instead: %d " |
| "from %s:%d in %d\n", |
| ENDPOINT_NUMBER(endp), tsdelta, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| } |
| } |
| |
| out_timestamp = state->out_stream.last_timestamp + delta_seq * tsdelta; |
| timestamp_offset = out_timestamp - in_timestamp; |
| |
| if (state->timestamp_offset != timestamp_offset) { |
| state->timestamp_offset = timestamp_offset; |
| |
| LOGP(DMGCP, LOGL_NOTICE, |
| "Timestamp offset change on 0x%x SSRC: %u " |
| "SeqNo delta: %d, TS offset: %d, " |
| "from %s:%d in %d\n", |
| ENDPOINT_NUMBER(endp), state->in_stream.ssrc, |
| delta_seq, state->timestamp_offset, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| } |
| |
| return timestamp_offset; |
| } |
| |
| /* Set the timestamp offset according to the packet duration. */ |
| static int align_rtp_timestamp_offset(struct mgcp_endpoint *endp, |
| struct mgcp_rtp_state *state, |
| struct mgcp_rtp_end *rtp_end, |
| struct sockaddr_in *addr, |
| uint32_t timestamp) |
| { |
| int timestamp_error = 0; |
| int ptime = state->packet_duration; |
| |
| /* Align according to: T + Toffs - Tlast = k * Tptime */ |
| |
| timestamp_error = compute_timestamp_aligment_error( |
| &state->out_stream, ptime, |
| timestamp + state->timestamp_offset); |
| |
| if (timestamp_error) { |
| state->timestamp_offset += ptime - timestamp_error; |
| |
| LOGP(DMGCP, LOGL_NOTICE, |
| "Corrected timestamp alignment error of %d on 0x%x SSRC: %u " |
| "new TS offset: %d, " |
| "from %s:%d in %d\n", |
| timestamp_error, |
| ENDPOINT_NUMBER(endp), state->in_stream.ssrc, |
| state->timestamp_offset, inet_ntoa(addr->sin_addr), |
| ntohs(addr->sin_port), endp->conn_mode); |
| } |
| |
| OSMO_ASSERT(compute_timestamp_aligment_error(&state->out_stream, ptime, |
| timestamp + state->timestamp_offset) == 0); |
| |
| return timestamp_error; |
| } |
| |
| int mgcp_rtp_processing_default(struct mgcp_endpoint *endp, struct mgcp_rtp_end *dst_end, |
| char *data, int *len, int buf_size) |
| { |
| return 0; |
| } |
| |
| int mgcp_setup_rtp_processing_default(struct mgcp_endpoint *endp, |
| struct mgcp_rtp_end *dst_end, |
| struct mgcp_rtp_end *src_end) |
| { |
| return 0; |
| } |
| |
| void mgcp_get_net_downlink_format_default(struct mgcp_endpoint *endp, |
| int *payload_type, |
| const char**audio_name, |
| const char**fmtp_extra) |
| { |
| /* Use the BTS side parameters when passing the SDP data (for |
| * downlink) to the net peer. |
| */ |
| *payload_type = endp->bts_end.codec.payload_type; |
| *audio_name = endp->bts_end.codec.audio_name; |
| *fmtp_extra = endp->bts_end.fmtp_extra; |
| } |
| |
| |
| void mgcp_rtp_annex_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *state, |
| const uint16_t seq, const int32_t transit, |
| const uint32_t ssrc) |
| { |
| int32_t d; |
| |
| /* initialize or re-initialize */ |
| if (!state->stats_initialized || state->stats_ssrc != ssrc) { |
| state->stats_initialized = 1; |
| state->stats_base_seq = seq; |
| state->stats_max_seq = seq - 1; |
| state->stats_ssrc = ssrc; |
| state->stats_jitter = 0; |
| state->stats_transit = transit; |
| state->stats_cycles = 0; |
| } else { |
| uint16_t udelta; |
| |
| /* |
| * The below takes the shape of the validation of |
| * Appendix A. Check if there is something weird with |
| * the sequence number, otherwise check for a wrap |
| * around in the sequence number. |
| * It can't wrap during the initialization so let's |
| * skip it here. The Appendix A probably doesn't have |
| * this issue because of the probation. |
| */ |
| udelta = seq - state->stats_max_seq; |
| if (udelta < RTP_MAX_DROPOUT) { |
| if (seq < state->stats_max_seq) |
| state->stats_cycles += RTP_SEQ_MOD; |
| } else if (udelta <= RTP_SEQ_MOD - RTP_MAX_MISORDER) { |
| LOGP(DMGCP, LOGL_NOTICE, |
| "RTP seqno made a very large jump on 0x%x delta: %u\n", |
| ENDPOINT_NUMBER(endp), udelta); |
| } |
| } |
| |
| /* |
| * Calculate the jitter between the two packages. The TS should be |
| * taken closer to the read function. This was taken from the |
| * Appendix A of RFC 3550. Timestamp and arrival_time have a 1/rate |
| * resolution. |
| */ |
| d = transit - state->stats_transit; |
| state->stats_transit = transit; |
| if (d < 0) |
| d = -d; |
| state->stats_jitter += d - ((state->stats_jitter + 8) >> 4); |
| state->stats_max_seq = seq; |
| } |
| |
| |
| |
| /** |
| * The RFC 3550 Appendix A assumes there are multiple sources but |
| * some of the supported endpoints (e.g. the nanoBTS) can only handle |
| * one source and this code will patch RTP header to appear as if there |
| * is only one source. |
| * There is also no probation period for new sources. Every RTP header |
| * we receive will be seen as a switch in streams. |
| */ |
| void mgcp_patch_and_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *state, |
| struct mgcp_rtp_end *rtp_end, struct sockaddr_in *addr, |
| char *data, int len) |
| { |
| uint32_t arrival_time; |
| int32_t transit; |
| uint16_t seq; |
| uint32_t timestamp, ssrc; |
| struct rtp_hdr *rtp_hdr; |
| int payload = rtp_end->codec.payload_type; |
| |
| if (len < sizeof(*rtp_hdr)) |
| return; |
| |
| rtp_hdr = (struct rtp_hdr *) data; |
| seq = ntohs(rtp_hdr->sequence); |
| timestamp = ntohl(rtp_hdr->timestamp); |
| arrival_time = get_current_ts(rtp_end->codec.rate); |
| ssrc = ntohl(rtp_hdr->ssrc); |
| transit = arrival_time - timestamp; |
| |
| mgcp_rtp_annex_count(endp, state, seq, transit, ssrc); |
| |
| if (!state->initialized) { |
| state->initialized = 1; |
| state->in_stream.last_seq = seq - 1; |
| state->in_stream.ssrc = state->orig_ssrc = ssrc; |
| state->in_stream.last_tsdelta = 0; |
| state->packet_duration = mgcp_rtp_packet_duration(endp, rtp_end); |
| state->out_stream = state->in_stream; |
| state->out_stream.last_timestamp = timestamp; |
| state->out_stream.ssrc = ssrc - 1; /* force output SSRC change */ |
| LOGP(DMGCP, LOGL_INFO, |
| "Initializing stream on 0x%x SSRC: %u timestamp: %u " |
| "pkt-duration: %d, from %s:%d in %d\n", |
| ENDPOINT_NUMBER(endp), state->in_stream.ssrc, |
| state->seq_offset, state->packet_duration, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| if (state->packet_duration == 0) { |
| state->packet_duration = rtp_end->codec.rate * 20 / 1000; |
| LOGP(DMGCP, LOGL_NOTICE, |
| "Fixed packet duration is not available on 0x%x, " |
| "using fixed 20ms instead: %d from %s:%d in %d\n", |
| ENDPOINT_NUMBER(endp), state->packet_duration, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| } |
| } else if (state->in_stream.ssrc != ssrc) { |
| LOGP(DMGCP, LOGL_NOTICE, |
| "The SSRC changed on 0x%x: %u -> %u " |
| "from %s:%d in %d\n", |
| ENDPOINT_NUMBER(endp), |
| state->in_stream.ssrc, rtp_hdr->ssrc, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| |
| state->in_stream.ssrc = ssrc; |
| if (rtp_end->force_constant_ssrc) { |
| int16_t delta_seq; |
| |
| /* Always increment seqno by 1 */ |
| state->seq_offset = |
| (state->out_stream.last_seq + 1) - seq; |
| |
| /* Estimate number of packets that would have been sent */ |
| delta_seq = |
| (arrival_time - state->in_stream.last_arrival_time |
| + state->packet_duration/2) / |
| state->packet_duration; |
| |
| adjust_rtp_timestamp_offset(endp, state, rtp_end, addr, |
| delta_seq, timestamp); |
| |
| state->patch_ssrc = 1; |
| ssrc = state->orig_ssrc; |
| if (rtp_end->force_constant_ssrc != -1) |
| rtp_end->force_constant_ssrc -= 1; |
| |
| LOGP(DMGCP, LOGL_NOTICE, |
| "SSRC patching enabled on 0x%x SSRC: %u " |
| "SeqNo offset: %d, TS offset: %d " |
| "from %s:%d in %d\n", |
| ENDPOINT_NUMBER(endp), state->in_stream.ssrc, |
| state->seq_offset, state->timestamp_offset, |
| inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), |
| endp->conn_mode); |
| } |
| |
| state->in_stream.last_tsdelta = 0; |
| } else { |
| /* Compute current per-packet timestamp delta */ |
| check_rtp_timestamp(endp, state, &state->in_stream, rtp_end, addr, |
| seq, timestamp, "input", |
| &state->in_stream.last_tsdelta); |
| |
| if (state->patch_ssrc) |
| ssrc = state->orig_ssrc; |
| } |
| |
| /* Save before patching */ |
| state->in_stream.last_timestamp = timestamp; |
| state->in_stream.last_seq = seq; |
| state->in_stream.last_arrival_time = arrival_time; |
| |
| if (rtp_end->force_aligned_timing && |
| state->out_stream.ssrc == ssrc && state->packet_duration) |
| /* Align the timestamp offset */ |
| align_rtp_timestamp_offset(endp, state, rtp_end, addr, timestamp); |
| |
| /* Store the updated SSRC back to the packet */ |
| if (state->patch_ssrc) |
| rtp_hdr->ssrc = htonl(ssrc); |
| |
| /* Apply the offset and store it back to the packet. |
| * This won't change anything if the offset is 0, so the conditional is |
| * omitted. */ |
| seq += state->seq_offset; |
| rtp_hdr->sequence = htons(seq); |
| timestamp += state->timestamp_offset; |
| rtp_hdr->timestamp = htonl(timestamp); |
| |
| /* Check again, whether the timestamps are still valid */ |
| if (state->out_stream.ssrc == ssrc) |
| check_rtp_timestamp(endp, state, &state->out_stream, rtp_end, |
| addr, seq, timestamp, "output", |
| &state->out_stream.last_tsdelta); |
| |
| /* Save output values */ |
| state->out_stream.last_seq = seq; |
| state->out_stream.last_timestamp = timestamp; |
| state->out_stream.ssrc = ssrc; |
| |
| if (payload < 0) |
| return; |
| |
| rtp_hdr->payload_type = payload; |
| } |
| |
| /* |
| * The below code is for dispatching. We have a dedicated port for |
| * the data coming from the net and one to discover the BTS. |
| */ |
| static int forward_data(int fd, struct mgcp_rtp_tap *tap, const char *buf, int len) |
| { |
| if (!tap->enabled) |
| return 0; |
| |
| return sendto(fd, buf, len, 0, |
| (struct sockaddr *)&tap->forward, sizeof(tap->forward)); |
| } |
| |
| static int mgcp_send_transcoder(struct mgcp_rtp_end *end, |
| struct mgcp_config *cfg, int is_rtp, |
| const char *buf, int len) |
| { |
| int rc; |
| int port; |
| struct sockaddr_in addr; |
| |
| port = is_rtp ? end->rtp_port : end->rtcp_port; |
| |
| addr.sin_family = AF_INET; |
| addr.sin_addr = cfg->transcoder_in; |
| addr.sin_port = port; |
| |
| rc = sendto(is_rtp ? |
| end->rtp.fd : |
| end->rtcp.fd, buf, len, 0, |
| (struct sockaddr *) &addr, sizeof(addr)); |
| |
| if (rc != len) |
| LOGP(DMGCP, LOGL_ERROR, |
| "Failed to send data to the transcoder: %s\n", |
| strerror(errno)); |
| |
| return rc; |
| } |
| |
| int mgcp_send(struct mgcp_endpoint *endp, int dest, int is_rtp, |
| struct sockaddr_in *addr, char *buf, int rc) |
| { |
| struct mgcp_trunk_config *tcfg = endp->tcfg; |
| struct mgcp_rtp_end *rtp_end; |
| struct mgcp_rtp_state *rtp_state; |
| int tap_idx; |
| |
| /* For loop toggle the destination and then dispatch. */ |
| if (tcfg->audio_loop) |
| dest = !dest; |
| |
| /* Loop based on the conn_mode, maybe undoing the above */ |
| if (endp->conn_mode == MGCP_CONN_LOOPBACK) |
| dest = !dest; |
| |
| if (dest == MGCP_DEST_NET) { |
| rtp_end = &endp->net_end; |
| rtp_state = &endp->bts_state; |
| tap_idx = MGCP_TAP_NET_OUT; |
| } else { |
| rtp_end = &endp->bts_end; |
| rtp_state = &endp->net_state; |
| tap_idx = MGCP_TAP_BTS_OUT; |
| } |
| |
| if (!rtp_end->output_enabled) |
| rtp_end->dropped_packets += 1; |
| else if (is_rtp) { |
| int cont; |
| int nbytes = 0; |
| int len = rc; |
| do { |
| cont = endp->cfg->rtp_processing_cb(endp, rtp_end, |
| buf, &len, RTP_BUF_SIZE); |
| if (cont < 0) |
| break; |
| |
| mgcp_patch_and_count(endp, rtp_state, rtp_end, addr, buf, len); |
| forward_data(rtp_end->rtp.fd, &endp->taps[tap_idx], |
| buf, len); |
| rc = mgcp_udp_send(rtp_end->rtp.fd, |
| &rtp_end->addr, |
| rtp_end->rtp_port, buf, len); |
| |
| if (rc <= 0) |
| return rc; |
| nbytes += rc; |
| len = cont; |
| } while (len > 0); |
| return nbytes; |
| } else if (!tcfg->omit_rtcp) { |
| return mgcp_udp_send(rtp_end->rtcp.fd, |
| &rtp_end->addr, |
| rtp_end->rtcp_port, buf, rc); |
| } |
| |
| return 0; |
| } |
| |
| static int receive_from(struct mgcp_endpoint *endp, int fd, struct sockaddr_in *addr, |
| char *buf, int bufsize) |
| { |
| int rc; |
| socklen_t slen = sizeof(*addr); |
| |
| rc = recvfrom(fd, buf, bufsize, 0, |
| (struct sockaddr *) addr, &slen); |
| if (rc < 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to receive message on: 0x%x errno: %d/%s\n", |
| ENDPOINT_NUMBER(endp), errno, strerror(errno)); |
| return -1; |
| } |
| |
| /* do not forward aynthing... maybe there is a packet from the bts */ |
| if (!endp->allocated) |
| return -1; |
| |
| #warning "Slight spec violation. With connection mode recvonly we should attempt to forward." |
| |
| return rc; |
| } |
| |
| static int rtp_data_net(struct osmo_fd *fd, unsigned int what) |
| { |
| char buf[RTP_BUF_SIZE]; |
| struct sockaddr_in addr; |
| struct mgcp_endpoint *endp; |
| int rc, proto; |
| |
| endp = (struct mgcp_endpoint *) fd->data; |
| |
| rc = receive_from(endp, fd->fd, &addr, buf, sizeof(buf)); |
| if (rc <= 0) |
| return -1; |
| |
| if (memcmp(&addr.sin_addr, &endp->net_end.addr, sizeof(addr.sin_addr)) != 0) { |
| LOGP(DMGCP, LOGL_ERROR, |
| "Endpoint 0x%x data from wrong address %s vs. ", |
| ENDPOINT_NUMBER(endp), inet_ntoa(addr.sin_addr)); |
| LOGPC(DMGCP, LOGL_ERROR, |
| "%s\n", inet_ntoa(endp->net_end.addr)); |
| return -1; |
| } |
| |
| switch(endp->type) { |
| case MGCP_RTP_DEFAULT: |
| case MGCP_RTP_TRANSCODED: |
| if (endp->net_end.rtp_port != addr.sin_port && |
| endp->net_end.rtcp_port != addr.sin_port) { |
| LOGP(DMGCP, LOGL_ERROR, |
| "Data from wrong source port %d on 0x%x\n", |
| ntohs(addr.sin_port), ENDPOINT_NUMBER(endp)); |
| return -1; |
| } |
| break; |
| case MGCP_OSMUX_BSC: |
| case MGCP_OSMUX_BSC_NAT: |
| break; |
| } |
| |
| /* throw away the dummy message */ |
| if (rc == 1 && buf[0] == MGCP_DUMMY_LOAD) { |
| LOGP(DMGCP, LOGL_NOTICE, "Filtered dummy from network on 0x%x\n", |
| ENDPOINT_NUMBER(endp)); |
| return 0; |
| } |
| |
| proto = fd == &endp->net_end.rtp ? MGCP_PROTO_RTP : MGCP_PROTO_RTCP; |
| endp->net_end.packets += 1; |
| endp->net_end.octets += rc; |
| |
| forward_data(fd->fd, &endp->taps[MGCP_TAP_NET_IN], buf, rc); |
| |
| switch (endp->type) { |
| case MGCP_RTP_DEFAULT: |
| return mgcp_send(endp, MGCP_DEST_BTS, proto == MGCP_PROTO_RTP, |
| &addr, buf, rc); |
| case MGCP_RTP_TRANSCODED: |
| return mgcp_send_transcoder(&endp->trans_net, endp->cfg, |
| proto == MGCP_PROTO_RTP, buf, rc); |
| case MGCP_OSMUX_BSC_NAT: |
| return osmux_xfrm_to_osmux(MGCP_DEST_BTS, buf, rc, endp); |
| case MGCP_OSMUX_BSC: /* Should not happen */ |
| break; |
| } |
| |
| LOGP(DMGCP, LOGL_ERROR, "Bad MGCP type %u on endpoint %u\n", |
| endp->type, ENDPOINT_NUMBER(endp)); |
| return 0; |
| } |
| |
| static void discover_bts(struct mgcp_endpoint *endp, int proto, struct sockaddr_in *addr) |
| { |
| struct mgcp_config *cfg = endp->cfg; |
| |
| if (proto == MGCP_PROTO_RTP && endp->bts_end.rtp_port == 0) { |
| if (!cfg->bts_ip || |
| memcmp(&addr->sin_addr, |
| &cfg->bts_in, sizeof(cfg->bts_in)) == 0 || |
| memcmp(&addr->sin_addr, |
| &endp->bts_end.addr, sizeof(endp->bts_end.addr)) == 0) { |
| |
| endp->bts_end.rtp_port = addr->sin_port; |
| endp->bts_end.addr = addr->sin_addr; |
| |
| LOGP(DMGCP, LOGL_NOTICE, |
| "Found BTS for endpoint: 0x%x on port: %d/%d of %s\n", |
| ENDPOINT_NUMBER(endp), ntohs(endp->bts_end.rtp_port), |
| ntohs(endp->bts_end.rtcp_port), inet_ntoa(addr->sin_addr)); |
| } |
| } else if (proto == MGCP_PROTO_RTCP && endp->bts_end.rtcp_port == 0) { |
| if (memcmp(&endp->bts_end.addr, &addr->sin_addr, |
| sizeof(endp->bts_end.addr)) == 0) { |
| endp->bts_end.rtcp_port = addr->sin_port; |
| } |
| } |
| } |
| |
| static int rtp_data_bts(struct osmo_fd *fd, unsigned int what) |
| { |
| char buf[RTP_BUF_SIZE]; |
| struct sockaddr_in addr; |
| struct mgcp_endpoint *endp; |
| int rc, proto; |
| |
| endp = (struct mgcp_endpoint *) fd->data; |
| |
| rc = receive_from(endp, fd->fd, &addr, buf, sizeof(buf)); |
| if (rc <= 0) |
| return -1; |
| |
| proto = fd == &endp->bts_end.rtp ? MGCP_PROTO_RTP : MGCP_PROTO_RTCP; |
| |
| /* We have no idea who called us, maybe it is the BTS. */ |
| /* it was the BTS... */ |
| discover_bts(endp, proto, &addr); |
| |
| if (memcmp(&endp->bts_end.addr, &addr.sin_addr, sizeof(addr.sin_addr)) != 0) { |
| LOGP(DMGCP, LOGL_ERROR, |
| "Data from wrong bts %s on 0x%x\n", |
| inet_ntoa(addr.sin_addr), ENDPOINT_NUMBER(endp)); |
| return -1; |
| } |
| |
| if (endp->bts_end.rtp_port != addr.sin_port && |
| endp->bts_end.rtcp_port != addr.sin_port) { |
| LOGP(DMGCP, LOGL_ERROR, |
| "Data from wrong bts source port %d on 0x%x\n", |
| ntohs(addr.sin_port), ENDPOINT_NUMBER(endp)); |
| return -1; |
| } |
| |
| /* throw away the dummy message */ |
| if (rc == 1 && buf[0] == MGCP_DUMMY_LOAD) { |
| LOGP(DMGCP, LOGL_NOTICE, "Filtered dummy from bts on 0x%x\n", |
| ENDPOINT_NUMBER(endp)); |
| return 0; |
| } |
| |
| /* do this before the loop handling */ |
| endp->bts_end.packets += 1; |
| endp->bts_end.octets += rc; |
| |
| forward_data(fd->fd, &endp->taps[MGCP_TAP_BTS_IN], buf, rc); |
| |
| switch (endp->type) { |
| case MGCP_RTP_DEFAULT: |
| return mgcp_send(endp, MGCP_DEST_NET, proto == MGCP_PROTO_RTP, |
| &addr, buf, rc); |
| case MGCP_RTP_TRANSCODED: |
| return mgcp_send_transcoder(&endp->trans_bts, endp->cfg, |
| proto == MGCP_PROTO_RTP, buf, rc); |
| case MGCP_OSMUX_BSC: |
| /* OSMUX translation: BTS -> BSC */ |
| return osmux_xfrm_to_osmux(MGCP_DEST_NET, buf, rc, endp); |
| case MGCP_OSMUX_BSC_NAT: |
| break; /* Should not happen */ |
| } |
| |
| LOGP(DMGCP, LOGL_ERROR, "Bad MGCP type %u on endpoint %u\n", |
| endp->type, ENDPOINT_NUMBER(endp)); |
| return 0; |
| } |
| |
| static int rtp_data_transcoder(struct mgcp_rtp_end *end, struct mgcp_endpoint *_endp, |
| int dest, struct osmo_fd *fd) |
| { |
| char buf[RTP_BUF_SIZE]; |
| struct sockaddr_in addr; |
| struct mgcp_config *cfg; |
| int rc, proto; |
| |
| cfg = _endp->cfg; |
| rc = receive_from(_endp, fd->fd, &addr, buf, sizeof(buf)); |
| if (rc <= 0) |
| return -1; |
| |
| proto = fd == &end->rtp ? MGCP_PROTO_RTP : MGCP_PROTO_RTCP; |
| |
| if (memcmp(&addr.sin_addr, &cfg->transcoder_in, sizeof(addr.sin_addr)) != 0) { |
| LOGP(DMGCP, LOGL_ERROR, |
| "Data not coming from transcoder dest: %d %s on 0x%x\n", |
| dest, inet_ntoa(addr.sin_addr), ENDPOINT_NUMBER(_endp)); |
| return -1; |
| } |
| |
| if (end->rtp_port != addr.sin_port && |
| end->rtcp_port != addr.sin_port) { |
| LOGP(DMGCP, LOGL_ERROR, |
| "Data from wrong transcoder dest %d source port %d on 0x%x\n", |
| dest, ntohs(addr.sin_port), ENDPOINT_NUMBER(_endp)); |
| return -1; |
| } |
| |
| /* throw away the dummy message */ |
| if (rc == 1 && buf[0] == MGCP_DUMMY_LOAD) { |
| LOGP(DMGCP, LOGL_NOTICE, "Filtered dummy from transcoder dest %d on 0x%x\n", |
| dest, ENDPOINT_NUMBER(_endp)); |
| return 0; |
| } |
| |
| end->packets += 1; |
| return mgcp_send(_endp, dest, proto == MGCP_PROTO_RTP, &addr, buf, rc); |
| } |
| |
| static int rtp_data_trans_net(struct osmo_fd *fd, unsigned int what) |
| { |
| struct mgcp_endpoint *endp; |
| endp = (struct mgcp_endpoint *) fd->data; |
| |
| return rtp_data_transcoder(&endp->trans_net, endp, MGCP_DEST_NET, fd); |
| } |
| |
| static int rtp_data_trans_bts(struct osmo_fd *fd, unsigned int what) |
| { |
| struct mgcp_endpoint *endp; |
| endp = (struct mgcp_endpoint *) fd->data; |
| |
| return rtp_data_transcoder(&endp->trans_bts, endp, MGCP_DEST_BTS, fd); |
| } |
| |
| int mgcp_create_bind(const char *source_addr, struct osmo_fd *fd, int port) |
| { |
| struct sockaddr_in addr; |
| int on = 1; |
| |
| fd->fd = socket(AF_INET, SOCK_DGRAM, 0); |
| if (fd->fd < 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to create UDP port.\n"); |
| return -1; |
| } |
| |
| setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| memset(&addr, 0, sizeof(addr)); |
| addr.sin_family = AF_INET; |
| addr.sin_port = htons(port); |
| inet_aton(source_addr, &addr.sin_addr); |
| |
| if (bind(fd->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| close(fd->fd); |
| fd->fd = -1; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int mgcp_set_ip_tos(int fd, int tos) |
| { |
| int ret; |
| ret = setsockopt(fd, IPPROTO_IP, IP_TOS, |
| &tos, sizeof(tos)); |
| return ret != 0; |
| } |
| |
| static int bind_rtp(struct mgcp_config *cfg, const char *source_addr, |
| struct mgcp_rtp_end *rtp_end, int endpno) |
| { |
| if (mgcp_create_bind(source_addr, &rtp_end->rtp, |
| rtp_end->local_port) != 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to create RTP port: %s:%d on 0x%x\n", |
| source_addr, rtp_end->local_port, endpno); |
| goto cleanup0; |
| } |
| |
| if (mgcp_create_bind(source_addr, &rtp_end->rtcp, |
| rtp_end->local_port + 1) != 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to create RTCP port: %s:%d on 0x%x\n", |
| source_addr, rtp_end->local_port + 1, endpno); |
| goto cleanup1; |
| } |
| |
| mgcp_set_ip_tos(rtp_end->rtp.fd, cfg->endp_dscp); |
| mgcp_set_ip_tos(rtp_end->rtcp.fd, cfg->endp_dscp); |
| |
| rtp_end->rtp.when = BSC_FD_READ; |
| if (osmo_fd_register(&rtp_end->rtp) != 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to register RTP port %d on 0x%x\n", |
| rtp_end->local_port, endpno); |
| goto cleanup2; |
| } |
| |
| rtp_end->rtcp.when = BSC_FD_READ; |
| if (osmo_fd_register(&rtp_end->rtcp) != 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to register RTCP port %d on 0x%x\n", |
| rtp_end->local_port + 1, endpno); |
| goto cleanup3; |
| } |
| |
| return 0; |
| |
| cleanup3: |
| osmo_fd_unregister(&rtp_end->rtp); |
| cleanup2: |
| close(rtp_end->rtcp.fd); |
| rtp_end->rtcp.fd = -1; |
| cleanup1: |
| close(rtp_end->rtp.fd); |
| rtp_end->rtp.fd = -1; |
| cleanup0: |
| return -1; |
| } |
| |
| static int int_bind(const char *port, |
| struct mgcp_rtp_end *end, int (*cb)(struct osmo_fd *, unsigned), |
| struct mgcp_endpoint *_endp, |
| const char *source_addr, int rtp_port) |
| { |
| if (end->rtp.fd != -1 || end->rtcp.fd != -1) { |
| LOGP(DMGCP, LOGL_ERROR, "Previous %s was still bound on %d\n", |
| port, ENDPOINT_NUMBER(_endp)); |
| mgcp_free_rtp_port(end); |
| } |
| |
| end->local_port = rtp_port; |
| end->rtp.cb = cb; |
| end->rtp.data = _endp; |
| end->rtcp.data = _endp; |
| end->rtcp.cb = cb; |
| return bind_rtp(_endp->cfg, source_addr, end, ENDPOINT_NUMBER(_endp)); |
| } |
| |
| int mgcp_bind_bts_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| { |
| return int_bind("bts-port", &endp->bts_end, |
| rtp_data_bts, endp, |
| mgcp_bts_src_addr(endp), rtp_port); |
| } |
| |
| int mgcp_bind_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| { |
| return int_bind("net-port", &endp->net_end, |
| rtp_data_net, endp, |
| mgcp_net_src_addr(endp), rtp_port); |
| } |
| |
| int mgcp_bind_trans_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| { |
| return int_bind("trans-net", &endp->trans_net, |
| rtp_data_trans_net, endp, |
| endp->cfg->source_addr, rtp_port); |
| } |
| |
| int mgcp_bind_trans_bts_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| { |
| return int_bind("trans-bts", &endp->trans_bts, |
| rtp_data_trans_bts, endp, |
| endp->cfg->source_addr, rtp_port); |
| } |
| |
| int mgcp_free_rtp_port(struct mgcp_rtp_end *end) |
| { |
| if (end->rtp.fd != -1) { |
| close(end->rtp.fd); |
| end->rtp.fd = -1; |
| osmo_fd_unregister(&end->rtp); |
| } |
| |
| if (end->rtcp.fd != -1) { |
| close(end->rtcp.fd); |
| end->rtcp.fd = -1; |
| osmo_fd_unregister(&end->rtcp); |
| } |
| |
| return 0; |
| } |
| |
| |
| void mgcp_state_calc_loss(struct mgcp_rtp_state *state, |
| struct mgcp_rtp_end *end, uint32_t *expected, |
| int *loss) |
| { |
| *expected = state->stats_cycles + state->stats_max_seq; |
| *expected = *expected - state->stats_base_seq + 1; |
| |
| if (!state->stats_initialized) { |
| *expected = 0; |
| *loss = 0; |
| return; |
| } |
| |
| /* |
| * Make sure the sign is correct and use the biggest |
| * positive/negative number that fits. |
| */ |
| *loss = *expected - end->packets; |
| if (*expected < end->packets) { |
| if (*loss > 0) |
| *loss = INT_MIN; |
| } else { |
| if (*loss < 0) |
| *loss = INT_MAX; |
| } |
| } |
| |
| uint32_t mgcp_state_calc_jitter(struct mgcp_rtp_state *state) |
| { |
| if (!state->stats_initialized) |
| return 0; |
| return state->stats_jitter >> 4; |
| } |