1053 lines
29 KiB
C
1053 lines
29 KiB
C
/* 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 <sys/socket.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <osmocom/core/msgb.h>
|
|
#include <osmocom/core/select.h>
|
|
|
|
#include <openbsc/mgcp.h>
|
|
#include <openbsc/mgcp_internal.h>
|
|
#include <openbsc/rtp.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;
|
|
|
|
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;
|
|
|
|
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 packet: %s on: 0x%x to %s\n",
|
|
strerror(errno), ENDPOINT_NUMBER(endp), inet_ntoa(endp->net_end.addr));
|
|
|
|
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, struct mgcp_rtp_end *rtp_end, int endpno)
|
|
{
|
|
if (mgcp_create_bind(cfg->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",
|
|
cfg->source_addr, rtp_end->local_port, endpno);
|
|
goto cleanup0;
|
|
}
|
|
|
|
if (mgcp_create_bind(cfg->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",
|
|
cfg->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, 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, 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, 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, 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, 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, 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;
|
|
}
|