/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ /* The protocol implementation */ /* * (C) 2009-2012 by Holger Hans Peter Freyther * (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 . * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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; DEBUGP(DMGCP, "Payload hdr payload %u -> endp payload %u\n", rtp_hdr->payload_type, payload); 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; LOGP(DMGCP, LOGL_DEBUG, "endpoint %x dest %s tcfg->audio_loop %d endp->conn_mode %d (== loopback: %d)\n", ENDPOINT_NUMBER(endp), dest == MGCP_DEST_NET? "net" : "bts", tcfg->audio_loop, endp->conn_mode, endp->conn_mode == MGCP_CONN_LOOPBACK); /* 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; } LOGP(DMGCP, LOGL_DEBUG, "endpoint %x dest %s net_end %s %d %d bts_end %s %d %d rtp_end %s %d %d\n", ENDPOINT_NUMBER(endp), dest == MGCP_DEST_NET? "net" : "bts", inet_ntoa(endp->net_end.addr), ntohs(endp->net_end.rtp_port), ntohs(endp->net_end.rtcp_port), inet_ntoa(endp->bts_end.addr), ntohs(endp->bts_end.rtp_port), ntohs(endp->bts_end.rtcp_port), inet_ntoa(rtp_end->addr), ntohs(rtp_end->rtp_port), ntohs(rtp_end->rtcp_port) ); if (!rtp_end->output_enabled) { rtp_end->dropped_packets += 1; LOGP(DMGCP, LOGL_DEBUG, "endpoint %x output disabled, drop to %s %s %d %d\n", ENDPOINT_NUMBER(endp), dest == MGCP_DEST_NET? "net" : "bts", inet_ntoa(rtp_end->addr), ntohs(rtp_end->rtp_port), ntohs(rtp_end->rtcp_port) ); } 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); LOGP(DMGCP, LOGL_DEBUG, "endpoint %x process/send to %s %s %d %d\n", ENDPOINT_NUMBER(endp), (dest == MGCP_DEST_NET)? "net" : "bts", inet_ntoa(rtp_end->addr), ntohs(rtp_end->rtp_port), ntohs(rtp_end->rtcp_port) ); 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) { LOGP(DMGCP, LOGL_DEBUG, "endpoint %x send to %s %s %d %d\n", ENDPOINT_NUMBER(endp), dest == MGCP_DEST_NET? "net" : "bts", inet_ntoa(rtp_end->addr), ntohs(rtp_end->rtp_port), ntohs(rtp_end->rtcp_port) ); 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; LOGP(DMGCP, LOGL_DEBUG, "endpoint %x", ENDPOINT_NUMBER(endp)); LOGPC(DMGCP, LOGL_DEBUG, " from net %s %d", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port)); LOGPC(DMGCP, LOGL_DEBUG, " net_end %s %d %d", inet_ntoa(endp->net_end.addr), ntohs(endp->net_end.rtp_port), ntohs(endp->net_end.rtcp_port)); LOGPC(DMGCP, LOGL_DEBUG, " bts_end %s %d %d\n", inet_ntoa(endp->bts_end.addr), ntohs(endp->bts_end.rtp_port), ntohs(endp->bts_end.rtcp_port) ); if (memcmp(&addr.sin_addr, &endp->net_end.addr, sizeof(addr.sin_addr)) != 0) { LOGP(DMGCP, LOGL_ERROR, "rtp_data_net: 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, "rtp_data_net: 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; } LOGP(DMGCP, LOGL_DEBUG, "rtp_data_net: Endpoint %x data from %s %d\n", ENDPOINT_NUMBER(endp), inet_ntoa(addr.sin_addr), ntohs(addr.sin_port)); /* 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, "rtp_data_bts: 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, "rtp_data_bts: ata from wrong bts source port %d on 0x%x\n", ntohs(addr.sin_port), ENDPOINT_NUMBER(endp)); return -1; } LOGP(DMGCP, LOGL_DEBUG, "rtp_data_bts: Endpoint %x data from %s %d\n", ENDPOINT_NUMBER(endp), inet_ntoa(addr.sin_addr), ntohs(addr.sin_port)); /* 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: LOGP(DMGCP, LOGL_DEBUG, "rtp_data_bts: Endpoint %x MGCP_RTP_DEFAULT\n", ENDPOINT_NUMBER(endp)); 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; }