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osmo-msc/openbsc/src/libmgcp/mgcp_network.c

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/* 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/osmux.h>
#warning "Make use of the rtp proxy code"
/* attempt to determine byte order */
#include <sys/param.h>
#include <limits.h>
#include <time.h>
#ifndef __BYTE_ORDER
# ifdef __APPLE__
# define __BYTE_ORDER __DARWIN_BYTE_ORDER
# define __LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
# define __BIG_ENDIAN __DARWIN_BIG_ENDIAN
# else
# error "__BYTE_ORDER should be defined by someone"
# endif
#endif
/* according to rtp_proxy.c RFC 3550 */
struct rtp_hdr {
#if __BYTE_ORDER == __LITTLE_ENDIAN
uint8_t csrc_count:4,
extension:1,
padding:1,
version:2;
uint8_t payload_type:7,
marker:1;
#elif __BYTE_ORDER == __BIG_ENDIAN
uint8_t version:2,
padding:1,
extension:1,
csrc_count:4;
uint8_t marker:1,
payload_type:7;
#endif
uint16_t sequence;
uint32_t timestamp;
uint32_t ssrc;
} __attribute__((packed));
#define RTP_SEQ_MOD (1 << 16)
#define RTP_MAX_DROPOUT 3000
#define RTP_MAX_MISORDER 100
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 %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);
}
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->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;
}
/**
* 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 packages to appear as if there
* is only one source.
* There is also no probation period for new sources. Every package
* 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, d;
uint16_t seq, udelta;
uint32_t timestamp, ssrc;
struct rtp_hdr *rtp_hdr;
int payload = rtp_end->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->rate);
ssrc = ntohl(rtp_hdr->ssrc);
transit = arrival_time - timestamp;
if (!state->initialized) {
state->in_stream.last_seq = seq - 1;
state->in_stream.ssrc = state->orig_ssrc = ssrc;
state->in_stream.last_tsdelta = 0;
state->base_seq = seq;
state->initialized = 1;
state->jitter = 0;
state->transit = transit;
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->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;
state->jitter = 0;
state->transit = transit;
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);
/*
* The below takes the shape of the validation from Appendix A. Check
* if there is something weird with the sequence number, otherwise check
* for a wrap around in the sequence number.
*
* Note that last_seq is used where the appendix mentions max_seq.
*/
udelta = seq - state->out_stream.last_seq;
if (udelta < RTP_MAX_DROPOUT) {
if (seq < state->out_stream.last_seq)
state->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->transit;
state->transit = transit;
if (d < 0)
d = -d;
state->jitter += d - ((state->jitter + 8) >> 4);
/* 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;
LOGP(DMGCP, LOGL_DEBUG, "delivering RTP to Network"
"via addr=%s, port=%u\n",
inet_ntoa(endp->net_end.addr),
ntohs(endp->net_end.rtp_port));
} else {
rtp_end = &endp->bts_end;
rtp_state = &endp->net_state;
tap_idx = MGCP_TAP_BTS_OUT;
LOGP(DMGCP, LOGL_DEBUG, "delivering RTP to BTS"
"via addr=%s, port=%u\n",
inet_ntoa(endp->bts_end.addr),
ntohs(endp->bts_end.rtp_port));
}
if (!rtp_end->output_enabled)
rtp_end->dropped_packets += 1;
else if (is_rtp) {
mgcp_patch_and_count(endp, rtp_state, rtp_end, addr, buf, rc);
forward_data(rtp_end->rtp.fd, &endp->taps[tap_idx], buf, rc);
return mgcp_udp_send(rtp_end->rtp.fd,
&rtp_end->addr,
rtp_end->rtp_port, buf, rc);
} 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[4096];
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[4096];
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[4096];
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;
}
static int 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;
}
set_ip_tos(rtp_end->rtp.fd, cfg->endp_dscp);
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->cycles + state->out_stream.last_seq;
*expected = *expected - state->base_seq + 1;
if (!state->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->initialized)
return 0;
return state->jitter >> 4;
}
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