create libosmo-mgcp and osmo-mgw by copying legacy code
This a cosmetic commit, copying libosmo-legacy-mgcp to libosmo-mgcp and
osmo-bsc_mgcp to osmo-mgw 1:1 at first, to provide a basis for next patches
that highlight the changes from legacy to new code.
Until osmo-msc and osmo-bsc are adjusted to operate with the new code, we will
keep the legacy code alongside the new code. The legacy code might be dropped
later.
Change-Id: Idf54481754a1765bdb2d0d7033bc0d7dc2018024
diff --git a/src/libosmo-mgcp/mgcp_network.c b/src/libosmo-mgcp/mgcp_network.c
new file mode 100644
index 0000000..8ccfb42
--- /dev/null
+++ b/src/libosmo-mgcp/mgcp_network.c
@@ -0,0 +1,1166 @@
+/* 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 <osmocom/legacy_mgcp/mgcp.h>
+#include <osmocom/legacy_mgcp/mgcp_internal.h>
+
+#include <osmocom/legacy_mgcp/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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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;
+
+#if 0
+ DEBUGP(DLMGCP, "Payload hdr payload %u -> endp payload %u\n",
+ rtp_hdr->payload_type, payload);
+ rtp_hdr->payload_type = payload;
+#endif
+}
+
+/*
+ * 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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);
+
+ /* FIXME: HACK HACK HACK. See OS#2459.
+ * The ip.access nano3G needs the first RTP payload's first two bytes to read hex
+ * 'e400', or it will reject the RAB assignment. It seems to not harm other femto
+ * cells (as long as we patch only the first RTP payload in each stream).
+ */
+ if (tap_idx == MGCP_TAP_BTS_OUT
+ && !rtp_state->patched_first_rtp_payload) {
+ uint8_t *data = (uint8_t*)&buf[12];
+ data[0] = 0xe4;
+ data[1] = 0x00;
+ rtp_state->patched_first_rtp_payload = true;
+ }
+
+ 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, LOGL_DEBUG,
+ "endpoint %x",
+ ENDPOINT_NUMBER(endp));
+ LOGPC(DLMGCP, LOGL_DEBUG,
+ " from net %s %d",
+ inet_ntoa(addr.sin_addr),
+ ntohs(addr.sin_port));
+ LOGPC(DLMGCP, 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(DLMGCP, 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(DLMGCP, LOGL_ERROR,
+ "rtp_data_net: Endpoint 0x%x data from wrong address %s vs. ",
+ ENDPOINT_NUMBER(endp), inet_ntoa(addr.sin_addr));
+ LOGPC(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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(DLMGCP, 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;
+}