3 * Copyright 2012 Google Inc, and Robin Seggelmann
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6 * modification, are permitted provided that the following conditions are met:
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28 #ifndef TALK_MEDIA_SCTP_SCTPDATAENGINE_H_
29 #define TALK_MEDIA_SCTP_SCTPDATAENGINE_H_
36 // Some ERRNO values get re-#defined to WSA* equivalents in some talk/
37 // headers. We save the original ones in an enum.
39 SCTP_EINPROGRESS = EINPROGRESS,
40 SCTP_EWOULDBLOCK = EWOULDBLOCK
42 } // namespace cricket
44 #include "talk/base/buffer.h"
45 #include "talk/base/scoped_ptr.h"
46 #include "talk/media/base/codec.h"
47 #include "talk/media/base/mediachannel.h"
48 #include "talk/media/base/mediaengine.h"
50 // Defined by "usrsctplib/usrsctp.h"
52 struct sctp_assoc_change;
53 struct sctp_stream_reset_event;
54 // Defined by <sys/socket.h>
57 // The highest stream ID (Sid) that SCTP allows, and the number of streams we
58 // tell SCTP we're going to use.
59 const uint32 kMaxSctpSid = 1023;
61 // A DataEngine that interacts with usrsctp.
63 // From channel calls, data flows like this:
64 // [worker thread (although it can in princple be another thread)]
65 // 1. SctpDataMediaChannel::SendData(data)
66 // 2. usrsctp_sendv(data)
67 // [worker thread returns; sctp thread then calls the following]
68 // 3. OnSctpOutboundPacket(wrapped_data)
69 // [sctp thread returns having posted a message for the worker thread]
70 // 4. SctpDataMediaChannel::OnMessage(wrapped_data)
71 // 5. SctpDataMediaChannel::OnPacketFromSctpToNetwork(wrapped_data)
72 // 6. NetworkInterface::SendPacket(wrapped_data)
73 // 7. ... across network ... a packet is sent back ...
74 // 8. SctpDataMediaChannel::OnPacketReceived(wrapped_data)
75 // 9. usrsctp_conninput(wrapped_data)
76 // [worker thread returns; sctp thread then calls the following]
77 // 10. OnSctpInboundData(data)
78 // [sctp thread returns having posted a message fot the worker thread]
79 // 11. SctpDataMediaChannel::OnMessage(inboundpacket)
80 // 12. SctpDataMediaChannel::OnInboundPacketFromSctpToChannel(inboundpacket)
81 // 13. SctpDataMediaChannel::OnDataFromSctpToChannel(data)
82 // 14. SctpDataMediaChannel::SignalDataReceived(data)
83 // [from the same thread, methods registered/connected to
84 // SctpDataMediaChannel are called with the recieved data]
85 class SctpDataEngine : public DataEngineInterface {
88 virtual ~SctpDataEngine();
90 virtual DataMediaChannel* CreateChannel(DataChannelType data_channel_type);
92 virtual const std::vector<DataCodec>& data_codecs() { return codecs_; }
95 static int usrsctp_engines_count;
96 std::vector<DataCodec> codecs_;
99 // TODO(ldixon): Make into a special type of TypedMessageData.
100 // Holds data to be passed on to a channel.
101 struct SctpInboundPacket;
103 class SctpDataMediaChannel : public DataMediaChannel,
104 public talk_base::MessageHandler {
106 // DataMessageType is used for the SCTP "Payload Protocol Identifier", as
107 // defined in http://tools.ietf.org/html/rfc4960#section-14.4
109 // For the list of IANA approved values see:
110 // http://www.iana.org/assignments/sctp-parameters/sctp-parameters.xml
111 // The value is not used by SCTP itself. It indicates the protocol running
113 enum PayloadProtocolIdentifier {
114 PPID_NONE = 0, // No protocol is specified.
115 // Matches the PPIDs in mozilla source and
116 // https://datatracker.ietf.org/doc/draft-ietf-rtcweb-data-protocol Sec. 9
117 // They're not yet assigned by IANA.
119 PPID_BINARY_PARTIAL = 52,
120 PPID_BINARY_LAST = 53,
121 PPID_TEXT_PARTIAL = 54,
125 typedef std::set<uint32> StreamSet;
127 // Given a thread which will be used to post messages (received data) to this
128 // SctpDataMediaChannel instance.
129 explicit SctpDataMediaChannel(talk_base::Thread* thread);
130 virtual ~SctpDataMediaChannel();
132 // When SetSend is set to true, connects. When set to false, disconnects.
133 // Calling: "SetSend(true); SetSend(false); SetSend(true);" will connect,
134 // disconnect, and reconnect.
135 virtual bool SetSend(bool send);
136 // Unless SetReceive(true) is called, received packets will be discarded.
137 virtual bool SetReceive(bool receive);
139 virtual bool AddSendStream(const StreamParams& sp);
140 virtual bool RemoveSendStream(uint32 ssrc);
141 virtual bool AddRecvStream(const StreamParams& sp);
142 virtual bool RemoveRecvStream(uint32 ssrc);
144 // Called when Sctp gets data. The data may be a notification or data for
145 // OnSctpInboundData. Called from the worker thread.
146 virtual void OnMessage(talk_base::Message* msg);
147 // Send data down this channel (will be wrapped as SCTP packets then given to
148 // sctp that will then post the network interface by OnMessage).
149 // Returns true iff successful data somewhere on the send-queue/network.
150 virtual bool SendData(const SendDataParams& params,
151 const talk_base::Buffer& payload,
152 SendDataResult* result = NULL);
153 // A packet is received from the network interface. Posted to OnMessage.
154 virtual void OnPacketReceived(talk_base::Buffer* packet,
155 const talk_base::PacketTime& packet_time);
157 // Exposed to allow Post call from c-callbacks.
158 talk_base::Thread* worker_thread() const { return worker_thread_; }
160 // TODO(ldixon): add a DataOptions class to mediachannel.h
161 virtual bool SetOptions(int options) { return false; }
162 virtual int GetOptions() const { return 0; }
164 // Many of these things are unused by SCTP, but are needed to fulfill
165 // the MediaChannel interface.
166 // TODO(pthatcher): Cleanup MediaChannel interface, or at least
167 // don't try calling these and return false. Right now, things
168 // don't work if we return false.
169 virtual bool SetStartSendBandwidth(int bps) { return true; }
170 virtual bool SetMaxSendBandwidth(int bps) { return true; }
171 virtual bool SetRecvRtpHeaderExtensions(
172 const std::vector<RtpHeaderExtension>& extensions) { return true; }
173 virtual bool SetSendRtpHeaderExtensions(
174 const std::vector<RtpHeaderExtension>& extensions) { return true; }
175 virtual bool SetSendCodecs(const std::vector<DataCodec>& codecs);
176 virtual bool SetRecvCodecs(const std::vector<DataCodec>& codecs);
177 virtual void OnRtcpReceived(talk_base::Buffer* packet,
178 const talk_base::PacketTime& packet_time) {}
179 virtual void OnReadyToSend(bool ready) {}
181 // Helper for debugging.
182 void set_debug_name(const std::string& debug_name) {
183 debug_name_ = debug_name;
185 const std::string& debug_name() const { return debug_name_; }
187 // Called with the SSID of a remote stream that's been closed.
188 sigslot::signal1<int> SignalStreamClosed;
191 sockaddr_conn GetSctpSockAddr(int port);
193 // Creates the socket and connects. Sets sending_ to true.
195 // Closes the socket. Sets sending_ to false.
198 // Returns false when openning the socket failed; when successfull sets
200 bool OpenSctpSocket();
201 // Sets sending_ to false and sock_ to NULL.
202 void CloseSctpSocket();
204 // Sends a SCTP_RESET_STREAM for all streams in closing_ssids_.
205 bool SendQueuedStreamResets();
208 bool AddStream(const StreamParams &sp);
209 // Queues a stream for reset.
210 bool ResetStream(uint32 ssrc);
212 // Called by OnMessage to send packet on the network.
213 void OnPacketFromSctpToNetwork(talk_base::Buffer* buffer);
214 // Called by OnMessage to decide what to do with the packet.
215 void OnInboundPacketFromSctpToChannel(SctpInboundPacket* packet);
216 void OnDataFromSctpToChannel(const ReceiveDataParams& params,
217 talk_base::Buffer* buffer);
218 void OnNotificationFromSctp(talk_base::Buffer* buffer);
219 void OnNotificationAssocChange(const sctp_assoc_change& change);
221 void OnStreamResetEvent(const struct sctp_stream_reset_event* evt);
223 // Responsible for marshalling incoming data to the channels listeners, and
224 // outgoing data to the network interface.
225 talk_base::Thread* worker_thread_;
226 // The local and remote SCTP port to use. These are passed along the wire
227 // and the listener and connector must be using the same port. It is not
228 // related to the ports at the IP level. If set to -1, we default to
232 struct socket* sock_; // The socket created by usrsctp_socket(...).
234 // sending_ is true iff there is a connected socket.
236 // receiving_ controls whether inbound packets are thrown away.
239 // When a data channel opens a stream, it goes into open_streams_. When we
240 // want to close it, the stream's ID goes into queued_reset_streams_. When
241 // we actually transmit a RE-CONFIG chunk with that stream ID, the ID goes
242 // into sent_reset_streams_. When we get a response RE-CONFIG chunk back
243 // acknowledging the reset, we remove the stream ID from
244 // sent_reset_streams_. We use sent_reset_streams_ to differentiate
245 // between acknowledgment RE-CONFIG and peer-initiated RE-CONFIGs.
246 StreamSet open_streams_;
247 StreamSet queued_reset_streams_;
248 StreamSet sent_reset_streams_;
250 // A human-readable name for debugging messages.
251 std::string debug_name_;
254 } // namespace cricket
256 #endif // TALK_MEDIA_SCTP_SCTPDATAENGINE_H_