path: root/openbsc/src/libmgcp/mgcp_network.c
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2017-03-09mgcp hack: don't change payload type when passing RTP thruNeels Hofmeyr1-0/+2
Change-Id: I9c43704a4c1e26d434c0d7e7ee370b2c21fb3399
2017-03-09mgcp: log payload type changeNeels Hofmeyr1-0/+2
Change-Id: Iee5fa667dece12174b1933345c1ed640a264ed97
2017-03-09mgcp dbg logNeels Hofmeyr1-6/+89
Change-Id: I56fda48edaa92abfc6e3886cdfce733bb0686f73
2015-10-08mgcp: Indicate where the sending failedHolger Hans Peter Freyther1-2/+6
The log message does not help and says where the data is being sent to. This is because we have both a RTP and RTCP port. Remember if we failed with RTCP or RTP and improve the log message. I was searching a case where the port was bound to a local address (e.g. and tried to send the data to a public one (e.g.
2015-08-20mgcp: Begin to separate network and bts endpointsHolger Hans Peter Freyther1-12/+17
Make it possible to bind the call-agent to a specific IP address and the network and bts end to different ip addresses. Begin by clarifying which source ip address we want to have.
2015-03-22rtp: Use osmocom/netif/rtp.h for the rtp structure definitionHolger Hans Peter Freyther1-1/+4
We depend on libosmo-netif unconditionally. Let's use this definition of rtp and have one portability issue less.
2015-01-21mgcp: Honor the rtp IP_TOS settings for OsmuxHolger Hans Peter Freyther1-3/+3
Honor the IP_TOS settings for Osmux as well. Re-use the RTP setting as it makes sense to classify the audio packets the same way. Fixes: OW#1369
2014-10-09mgcp: Count the incoming data instead of the modified oneHolger Hans Peter Freyther1-2/+2
For jitter, transit and packet loss we should count the data that arrived and not the data we send towards the remote. This is changing the jitter timings to what they were before the re-factoring. For forced timing we might willingly add jumps in the sequence number but for jitter and packet loss we are more interested in the data that traveled through the wire/air.
2014-10-09mgcp: Do not detect the initial package as a wrap aroundHolger Hans Peter Freyther1-20/+21
The Annex A code has a probation period but we don't have it. When starting with seq_no==0 do not assume that the sequence numbers have wrapped. Do it by moving the entire checking code into the else.
2014-10-09mgcp: Move Annex A counting out of patch/count methodHolger Hans Peter Freyther1-41/+63
mgcp_patch_and_count has grown due supporting linearizing timestamps, ssrc and other things for equipment like the ip.access nanoBTS. Fight back and move the Annex A code into a dedicated method. The result is updated as we now count after all the patching and for the Annex A code no change in SSRC can be detected.
2014-10-09mgcp: We only look at the RTP header use that in the commentHolger Hans Peter Freyther1-2/+2
2014-09-02mgcp: Move the "codec" params to a structHolger Hans Peter Freyther1-6/+6
We might be offered multiple codecs by the remote and need to switch between them once we receive data. Do this by moving it to a struct so we can separate between proposed and current codec. In SDP we can have multiple codecs but a global ptime. The current code doesn't separate that clearly instead we write it to the main codec.
2014-07-22mgcp: Patch and Count _after_ the transcodingHolger Hans Peter Freyther1-1/+1
When going from a ptime of 10 to 20 a lot of alignment errors are reported. In fact the alignment check should be done before and after the transcoding. As this is not possible right now only do it _after_ the patching.
2014-07-22mgcp: Mention the packet duration in the error messageHolger Hans Peter Freyther1-2/+2
2014-07-07rtp: Share the rtp header between the proxy and the mgcp codeHolger Hans Peter Freyther1-36/+1
2014-06-05mgcp: Add packet size (ptime) conversionJacob Erlbeck1-7/+23
The current transcoder implemenation always does a 1:1 recoding concerning the duration of a packet. So RTP timestamps and sequence numbers are not modified. This is not sufficient in some cases, e.g. when the BTS does only allow for a single fixed ptime. This patch decouples encoding from decoding and moves the decoded samples to the state structure so that samples can be combined or drain according to the packaging of incoming and outgoing packets. This patch incorporates parts of Holger's experimental fixes in 0e669e05^..9eba68f9. Ticket: OW#1111 Sponsored-by: On-Waves ehf
2014-06-05mgcp: Add a function to get media info for MGCP responsesJacob Erlbeck1-0/+13
This patch adds the get_net_downlink_format_cb() callback to provide payload_type, subtype_name, and fmtp_extra suitable for use in a MGCP response sent to the network. Per default, the BTS side values are returned since these must be honoured by the net peer when sending audio to the media gateway (unless transcoding is done). Sponsored-by: On-Waves ehf
2014-06-05mgcp: Add callbacks for payload processingJacob Erlbeck1-3/+17
This patch adds the callbacks rtp_processing_cb and setup_rtp_processing_cb to mgcp_config to support arbitrary RTP payload processing. Sponsored-by: On-Waves ehf
2014-05-22mgcp: Remove excessive logging for each frameHolger Hans Peter Freyther1-12/+0
2014-05-22mgcp: add voice muxer supportPablo Neira Ayuso1-21/+41
This patch adds the voice muxer. You can use this to batch RTP traffic to reduce bandwidth comsuption. Basically, osmux transforms RTP flows to a compact batch format, that is later on decompacted to its original form. Port UDP/1984 is used for the muxer traffic between osmo-bsc_nat and osmo-bsc_mgcp (in the BSC side). This feature depends on libosmo-netif, which contains the osmux core support. Osmux is requested on-demand via the MGCP CRCX/MDCX messages (using the vendor-specific extension X-Osmux: on) coming from the BSC-NAT, so you can selectively enable osmux per BSC from one the bsc-nat.cfg file, so we have a centralized point to enable/disable osmux. First thing you need to do is to accept requests to use Osmux, this can be done from VTY interface of osmo-bsc_nat and osmo-bsc_mgcp by adding the following line: mgcp ... osmux on osmux batch-factor 4 This just initializes the osmux engine. You still have to specify what BSC uses osmux from osmo-bsc_nat configuration file: ... bsc 1 osmux on bsc 2 ... bsc 3 osmux on In this case, bsc 1 and 3 should use osmux if possible, bsc 2 does not have osmux enabled. Thus, you can selectively enable osmux depending on the BSC, and we have a centralized point for configuration from the bsc-nat to enable osmux on demand, as suggested by Holger. At this moment, this patch contains heavy debug logging for each RTP packet that can be removed later to save cycles. The RTP ssrc/seqnum/timestamp is randomly allocated for each MDCX that is received to configure an endpoint.
2014-01-31mgcp/rtp: Base jitter calculation on input timestampsJacob Erlbeck1-2/+4
So far, the jitter computation has been based on output timestamps. This patch uses the input timestamps instead and resets jitter computation on SSRC changes. Sponsored-by: On-Waves ehf
2014-01-31mgcp/rtp: Compute delta timestamp based on wallclockJacob Erlbeck1-2/+10
Currently, when the SSRC changes within a stream and SSRC fixing is enabled, the RTP timestamp between the last packet that has been received with the old SSRC and the first packet of the new SSRC is always incremented by one packet duration. This can lead to audio muting (at least with the nanoBTS) when the wallclock interval between these packets is too large (> 1s). This patch changes the implementation to base the RTP timestamp offset on the wallclock interval that has passed between these two packets. Ticket: OW#466 Sponsored-by: On-Waves ehf
2014-01-31mgcp/rtp: Fix transit computation unitsJacob Erlbeck1-8/+12
Currently micro-secs and RTP rate get mixed when the transit value is computed in mgcp_patch_and_count(). This patch changes get_current_ts() to accept the desired rate as argument and to use it for the time conversion instead of always converting to microseconds. If microseconds are needed, get_current_ts(1000) can be used. The arrival_time is now measured in 1/rtp_end->rate seconds so that it can be directly compared to RTP timestamps as required by RFC3550 (section 6.4.1, see definition of 'interarrival jitter'). Sponsored-by: On-Waves ehf
2014-01-17openbsc: Fix coverity issuesJacob Erlbeck1-3/+16
This patch (hopefully) fixes the new defects reported by coverity. Addresses: ** CID 1156986: Negative array index read (NEGATIVE_RETURNS) /tests/gsm0408/gsm0408_test.c: 419 in test_si_range_helpers() /tests/gsm0408/gsm0408_test.c: 423 in test_si_range_helpers() /tests/gsm0408/gsm0408_test.c: 427 in test_si_range_helpers() ** CID 1156987: Unchecked return value from library (CHECKED_RETURN) /src/libmgcp/mgcp_protocol.c: 1150 in mgcp_keepalive_timer_cb() ** CID 1156988: Unchecked return value from library (CHECKED_RETURN) /src/libmgcp/mgcp_protocol.c: 983 in handle_modify_con() Sponsored-by: On-Waves ehf
2014-01-16mgcp/rtp: Send dummy packet to the RTCP destination, tooJacob Erlbeck1-2/+9
Currently a dummy packet is only sent to the RTP port. This is not enough if RTCP must also cross the SNAT. This patch sends an additional dummy packet to the RTCP net destination if omit_rtcp is not set. Sponsored-by: On-Waves ehf
2014-01-16mgcp/rtp: Make offset computation understandableJacob Erlbeck1-4/+4
Rename the timestamp variable to make in clear, that the input timestamp is meant. Add a helper variable to illustrate the offset computation. Sponsored-by: On-Waves ehf
2014-01-16mgcp/rtp: Add flag to disable RTP outputJacob Erlbeck1-1/+3
This patch make it possible to have a valid endpoint that drops all outgoing RTP packets. The number of dropped packets is shown by the VTY 'show mgcp' command. By default, this feature is disabled. To enable packet dropping, the corresponding output_enabled field must be set to 0. Ticket: OW#1044 Sponsored-by: On-Waves ehf
2014-01-16mgcp/rtp: Refactor mgcp_send to avoid code duplicationJacob Erlbeck1-28/+22
Currently there are two symmetric code paths which are selected by the packet destination (NET or BTS). This patch introduces 3 variables that take the different values and unifies both code paths into one. Sponsored-by: On-Waves ehf
2013-12-19mgcp/rtp: Only patch timestamp alignment errorsJacob Erlbeck1-39/+106
Currently, all timestamps are force to SeqNo*d + C which is more than required by the nanoBTS which seems to be sensitive to alignment errors only (dTS != k*d, d = ptime * rate = 160). This patch replaces the force_constant_timing feature by a force_aligned_timing feature. The timestamp offset will only be changed (and timestamp errors counted) when the alignment does not match to the raster based on ptime (default 20ms). The VTY interface does not change. Sponsored-by: On-Waves ehf
2013-12-13mgcp: Parse SDP to get rate and packet durationJacob Erlbeck1-0/+9
This patch parses the 'ptime' and 'maxptime' SDP attributes, and the SDP rate information and sets up packet_duration_ms accordingly. If the packet duration is unknown or allows for different values (e.g. because 'ptime' uses a range or 'maxptime' allows for more than one frame) the duration is set to 0. Sponsored-by: On-Waves ehf
2013-12-13mgcp/rtp: Refactor timestamp offset calculation into own functionJacob Erlbeck1-32/+66
Currently the timestamp offset calculation is done in two different places. This patch moves and unifies both code parts into a separate function. Sponsored-by: On-Waves ehf
2013-12-10mgcp/rtp: Refactored packet_duration computationJacob Erlbeck1-4/+1
Since the packet duration is given in ms with the 'ptime' RTP media attribute and also with the 'p' MGCP local connection option, the computation is changed to use this value (if present). The computation assumes, that there are N complete frames in a packet and takes into account, that the ptime value possibly had been rounded towards the next ms value (which is never the case with a frame length of exact 20ms). Sponsored-by: On-Waves ehf
2013-12-10mgcp/rtp: Fix RTP timestamps if enabledJacob Erlbeck1-9/+31
This forces the output timing to fulfill dTS = dSegNo * fixedPacketDuration where dSegNo = seqNo - lastSeqNo. If timestamp patching is enabled, the output timestamp will be set to lastTimestamp + dTS. This kind of relative updating is used to handle seqNo- and timestamp-wraparounds properly. The updating of timestamp and SSRC has been separated and the patch field of mgcp_rtp_state has been renamed to patch_ssrc to reflect it's semantics more closely. The offset fields are now used always and will change the corresponding header field if they are != 0. Ticket: OW#1065 Sponsored-by: On-Waves ehf
2013-12-10mgcp/rtp: Only patch SSRC once after MDCX if enabledJacob Erlbeck1-0/+2
Currently the output SSRC is always forced to be the same if SSRC patching is enabled. This patch modifies this to optionally restrict the number of SSRC changes that will be corrected. Note that the configuration only allows for the 'once' mode and 'off'. Sponsored-by: On-Waves ehf
2013-12-10mgcp/rtp: Use SSRC in proper byte orderingJacob Erlbeck1-9/+13
The ssrc has been used without respect to proper byte ordering in mgcp_patch_and_count(). This only affected log messages. This patch introduces a new variable 'ssrc' that takes the value of the SSRC in proper byte order. Sponsored-by: On-Waves ehf
2013-12-10mgcp/rtp: Compute default packet duration at state initialisiationJacob Erlbeck1-10/+13
This patch adds a packet_duration field to mgcp_rtp_state which contains the RTP packet's duration in RTP timestamp units or 0, when the duration is unknown or not fixed. Sponsored-by: On-Waves ehf
2013-12-10mgcp/rtp: Only update RTP header field offsets if enabledJacob Erlbeck1-16/+28
Currently seq_offset and timestamp_offset are updated on each SSRC change even when SSRC patching is not allowed. This patch fixes this by changing mgcp_patch_and_count() to only update these fields when SSRC patching is allowed. Sponsored-by: On-Waves ehf
2013-12-10mgcp/rtp: Change the log message shown when the SSRC changesJacob Erlbeck1-7/+9
Show old and new SSRC. Move logging command upward to show the values immediately after the change has been detected and before any fixing attempt is made. Sponsored-by: On-Waves ehf
2013-12-10mgcp/rtp: Add RTP header patch mode configurationJacob Erlbeck1-1/+1
This adds datastructures and a VTY frontend to configure the different type of RTP header patching: SSRC and timestamp. Note that timestamp patching is not yet implemented. Sponsored-by: On-Waves ehf
2013-12-05mgcp/rtp: Fix output timing error counterJacob Erlbeck1-3/+14
The tsdelta computation and error detection didn't handle the intialisation phase properly. This patches fixes this by skipping the output timing validation when the SSRCs don't match. Sponsored-by: On-Waves ehf
2013-11-25mgcp/rtp: Fix timestamp offset when patching RTP packetsJacob Erlbeck1-4/+19
The current implementation increments the seqno but does not increment the RTP timestamp, leading to two identical timestamps following one after the other. This patch fixes this by adding the computed tsdelta when the offset is calulated. In the unlikely case, that a tsdelta hasn't been computed yet when the SSRC changes, a tsdelta is computed based on the RTP rate and a RTP packet duration of 20ms (one speech frame per channel and packet). If the RTP rate is not known, a rate of 8000 is assumed. Note that this approach presumes, that the per RTP packet duration (in samples) is the same for the last two packets of the stream being replaced (the first one). Sponsored-by: On-Waves ehf
2013-11-25mgcp/rtp: Add test case for RTP timestamp patching and statsJacob Erlbeck1-9/+9
This patch adds a test case to check, whether RTP timestamps are generated properly after SSRC changes and whether the error counters work properly. Sponsored-by: On-Waves ehf
2013-11-25mgcp/rtp: Add counter for invalid RTP timestamp deltasJacob Erlbeck1-18/+108
This patch modifies the patch_and_count() function to check for RTP timestamp inconsistencies. It basically checks, whether dTS/dSeqNo remains constant. If this fails, the corresponding counter is incremented. There are four counter for this: Incoming and outgoing, each for streams from the BTS and the net. Note that this approach presumes, that the per RTP packet duration (in samples) remains the same throughout the entire stream. Changing the number of speech frames per channel and packet will be detected as error. In addition, the VTY command 'show mgcp' is extended by an optional 'stats' to show the counter values, too. Ticket: OW#964 Sponsored-by: On-Waves ehf
2013-08-27libmgcp: attach mgcp_ prefix to udp_sendPablo Neira Ayuso1-11/+16
This patch is a cleanup.
2013-08-14libmgcp: add mgcp prefix to functions and constantsPablo Neira Ayuso1-33/+37
Functions and constants that belong to the libmgcp scope are prefixed with mgcp_ and MGCP_. This patch is a cleanup.
2013-07-08libmgcp: add enum mgcp_type and use itPablo Neira Ayuso1-8/+26
This patch replaces the field 'is_transcoded' in the mgcp_endpoint structure by the enum mgcp_type, that can be further extended with new types.
2012-12-16mgcp: Fix the vary large jump detection in the codeHolger Hans Peter Freyther1-1/+1
GCC 3.x on PowerPC correctly highlights that the code is fishy. Re-reading the RFC 3550 shows that we should subtract it and then we are in the 16bit range. The probation and re-sync code is still missing. GCC: mgcp/mgcp_network.c:200: warning: comparison is always true due to limited range of data type
2012-11-12mgcp: Print both receivd and expected address in the error statementHolger Hans Peter Freyther1-2/+4
The log statement is split into two because inet_ntoa works on an internal buffer and would print the last address twice.
2012-11-12mgcp: Send the jitter statistics at the end of the callHolger Hans Peter Freyther1-0/+7
2012-11-12mgcp: Calculate the jitter with the formula/code from the appendixHolger Hans Peter Freyther1-0/+42
Use a usec timestamp for the local time. The seconds to usec will swap over to the lower bits but this appears to be correct. The CLOCK_MONOTONIC is used to fulfill the RFC 3550 requirement even if it is a bit slower than the gettimeofday. Make sure to initialize transit in a way that the first transit time will be 0. Otherwise the jitter will contain the difference of the localtime and the remote time.