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/media/base/codec.h"
45 #include "talk/media/base/mediachannel.h"
46 #include "talk/media/base/mediaengine.h"
47 #include "webrtc/base/buffer.h"
48 #include "webrtc/base/scoped_ptr.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 // This is the default SCTP port to use. It is passed along the wire and the
62 // connectee and connector must be using the same port. It is not related to the
63 // ports at the IP level. (Corresponds to: sockaddr_conn.sconn_port in
65 const int kSctpDefaultPort = 5000;
67 // A DataEngine that interacts with usrsctp.
69 // From channel calls, data flows like this:
70 // [worker thread (although it can in princple be another thread)]
71 // 1. SctpDataMediaChannel::SendData(data)
72 // 2. usrsctp_sendv(data)
73 // [worker thread returns; sctp thread then calls the following]
74 // 3. OnSctpOutboundPacket(wrapped_data)
75 // [sctp thread returns having posted a message for the worker thread]
76 // 4. SctpDataMediaChannel::OnMessage(wrapped_data)
77 // 5. SctpDataMediaChannel::OnPacketFromSctpToNetwork(wrapped_data)
78 // 6. NetworkInterface::SendPacket(wrapped_data)
79 // 7. ... across network ... a packet is sent back ...
80 // 8. SctpDataMediaChannel::OnPacketReceived(wrapped_data)
81 // 9. usrsctp_conninput(wrapped_data)
82 // [worker thread returns; sctp thread then calls the following]
83 // 10. OnSctpInboundData(data)
84 // [sctp thread returns having posted a message fot the worker thread]
85 // 11. SctpDataMediaChannel::OnMessage(inboundpacket)
86 // 12. SctpDataMediaChannel::OnInboundPacketFromSctpToChannel(inboundpacket)
87 // 13. SctpDataMediaChannel::OnDataFromSctpToChannel(data)
88 // 14. SctpDataMediaChannel::SignalDataReceived(data)
89 // [from the same thread, methods registered/connected to
90 // SctpDataMediaChannel are called with the recieved data]
91 class SctpDataEngine : public DataEngineInterface {
94 virtual ~SctpDataEngine();
96 virtual DataMediaChannel* CreateChannel(DataChannelType data_channel_type);
98 virtual const std::vector<DataCodec>& data_codecs() { return codecs_; }
101 static int usrsctp_engines_count;
102 std::vector<DataCodec> codecs_;
105 // TODO(ldixon): Make into a special type of TypedMessageData.
106 // Holds data to be passed on to a channel.
107 struct SctpInboundPacket;
109 class SctpDataMediaChannel : public DataMediaChannel,
110 public rtc::MessageHandler {
112 // DataMessageType is used for the SCTP "Payload Protocol Identifier", as
113 // defined in http://tools.ietf.org/html/rfc4960#section-14.4
115 // For the list of IANA approved values see:
116 // http://www.iana.org/assignments/sctp-parameters/sctp-parameters.xml
117 // The value is not used by SCTP itself. It indicates the protocol running
119 enum PayloadProtocolIdentifier {
120 PPID_NONE = 0, // No protocol is specified.
121 // Matches the PPIDs in mozilla source and
122 // https://datatracker.ietf.org/doc/draft-ietf-rtcweb-data-protocol Sec. 9
123 // They're not yet assigned by IANA.
125 PPID_BINARY_PARTIAL = 52,
126 PPID_BINARY_LAST = 53,
127 PPID_TEXT_PARTIAL = 54,
131 typedef std::set<uint32> StreamSet;
133 // Given a thread which will be used to post messages (received data) to this
134 // SctpDataMediaChannel instance.
135 explicit SctpDataMediaChannel(rtc::Thread* thread);
136 virtual ~SctpDataMediaChannel();
138 // When SetSend is set to true, connects. When set to false, disconnects.
139 // Calling: "SetSend(true); SetSend(false); SetSend(true);" will connect,
140 // disconnect, and reconnect.
141 virtual bool SetSend(bool send);
142 // Unless SetReceive(true) is called, received packets will be discarded.
143 virtual bool SetReceive(bool receive);
145 virtual bool AddSendStream(const StreamParams& sp);
146 virtual bool RemoveSendStream(uint32 ssrc);
147 virtual bool AddRecvStream(const StreamParams& sp);
148 virtual bool RemoveRecvStream(uint32 ssrc);
150 // Called when Sctp gets data. The data may be a notification or data for
151 // OnSctpInboundData. Called from the worker thread.
152 virtual void OnMessage(rtc::Message* msg);
153 // Send data down this channel (will be wrapped as SCTP packets then given to
154 // sctp that will then post the network interface by OnMessage).
155 // Returns true iff successful data somewhere on the send-queue/network.
156 virtual bool SendData(const SendDataParams& params,
157 const rtc::Buffer& payload,
158 SendDataResult* result = NULL);
159 // A packet is received from the network interface. Posted to OnMessage.
160 virtual void OnPacketReceived(rtc::Buffer* packet,
161 const rtc::PacketTime& packet_time);
163 // Exposed to allow Post call from c-callbacks.
164 rtc::Thread* worker_thread() const { return worker_thread_; }
166 // TODO(ldixon): add a DataOptions class to mediachannel.h
167 virtual bool SetOptions(int options) { return false; }
168 virtual int GetOptions() const { return 0; }
170 // Many of these things are unused by SCTP, but are needed to fulfill
171 // the MediaChannel interface.
172 // TODO(pthatcher): Cleanup MediaChannel interface, or at least
173 // don't try calling these and return false. Right now, things
174 // don't work if we return false.
175 virtual bool SetMaxSendBandwidth(int bps) { return true; }
176 virtual bool SetRecvRtpHeaderExtensions(
177 const std::vector<RtpHeaderExtension>& extensions) { return true; }
178 virtual bool SetSendRtpHeaderExtensions(
179 const std::vector<RtpHeaderExtension>& extensions) { return true; }
180 virtual bool SetSendCodecs(const std::vector<DataCodec>& codecs);
181 virtual bool SetRecvCodecs(const std::vector<DataCodec>& codecs);
182 virtual void OnRtcpReceived(rtc::Buffer* packet,
183 const rtc::PacketTime& packet_time) {}
184 virtual void OnReadyToSend(bool ready) {}
186 // Helper for debugging.
187 void set_debug_name(const std::string& debug_name) {
188 debug_name_ = debug_name;
190 const std::string& debug_name() const { return debug_name_; }
193 sockaddr_conn GetSctpSockAddr(int port);
195 // Creates the socket and connects. Sets sending_ to true.
197 // Closes the socket. Sets sending_ to false.
200 // Returns false when openning the socket failed; when successfull sets
202 bool OpenSctpSocket();
203 // Sets sending_ to false and sock_ to NULL.
204 void CloseSctpSocket();
206 // Sends a SCTP_RESET_STREAM for all streams in closing_ssids_.
207 bool SendQueuedStreamResets();
210 bool AddStream(const StreamParams &sp);
211 // Queues a stream for reset.
212 bool ResetStream(uint32 ssrc);
214 // Called by OnMessage to send packet on the network.
215 void OnPacketFromSctpToNetwork(rtc::Buffer* buffer);
216 // Called by OnMessage to decide what to do with the packet.
217 void OnInboundPacketFromSctpToChannel(SctpInboundPacket* packet);
218 void OnDataFromSctpToChannel(const ReceiveDataParams& params,
219 rtc::Buffer* buffer);
220 void OnNotificationFromSctp(rtc::Buffer* buffer);
221 void OnNotificationAssocChange(const sctp_assoc_change& change);
223 void OnStreamResetEvent(const struct sctp_stream_reset_event* evt);
225 // Responsible for marshalling incoming data to the channels listeners, and
226 // outgoing data to the network interface.
227 rtc::Thread* worker_thread_;
228 // The local and remote SCTP port to use. These are passed along the wire
229 // and the listener and connector must be using the same port. It is not
230 // related to the ports at the IP level. If set to -1, we default to
234 struct socket* sock_; // The socket created by usrsctp_socket(...).
236 // sending_ is true iff there is a connected socket.
238 // receiving_ controls whether inbound packets are thrown away.
241 // When a data channel opens a stream, it goes into open_streams_. When we
242 // want to close it, the stream's ID goes into queued_reset_streams_. When
243 // we actually transmit a RE-CONFIG chunk with that stream ID, the ID goes
244 // into sent_reset_streams_. When we get a response RE-CONFIG chunk back
245 // acknowledging the reset, we remove the stream ID from
246 // sent_reset_streams_. We use sent_reset_streams_ to differentiate
247 // between acknowledgment RE-CONFIG and peer-initiated RE-CONFIGs.
248 StreamSet open_streams_;
249 StreamSet queued_reset_streams_;
250 StreamSet sent_reset_streams_;
252 // A human-readable name for debugging messages.
253 std::string debug_name_;
256 } // namespace cricket
258 #endif // TALK_MEDIA_SCTP_SCTPDATAENGINE_H_