DataChannelProtocol.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef NETWERK_SCTP_DATACHANNEL_DATACHANNELPROTOCOL_H_

#define NETWERK_SCTP_DATACHANNEL_DATACHANNELPROTOCOL_H_

#if defined(__GNUC__)

#  define SCTP_PACKED __attribute__((packed))

#elif defined(_MSC_VER)

#  pragma pack(push, 1)

#  define SCTP_PACKED

#else

#  error "Unsupported compiler"

#endif

#define WEBRTC_DATACHANNEL_STREAMS_DEFAULT 256

// Do not change this value!

#define WEBRTC_DATACHANNEL_PORT_DEFAULT 5000

// TODO: Bug 1381146, change once we resolve the nsCString limitation

#define WEBRTC_DATACHANNEL_MAX_MESSAGE_SIZE_LOCAL 1073741823

#define WEBRTC_DATACHANNEL_MAX_MESSAGE_SIZE_REMOTE_DEFAULT 65536

// TODO: Bug 1382779, once resolved, can be increased to min(Uint8ArrayMaxSize,

// UINT32_MAX)

// TODO: Bug 1381146, once resolved, can be increased to whatever we support

//       then (hopefully SIZE_MAX) or be removed

#define WEBRTC_DATACHANNEL_MAX_MESSAGE_SIZE_REMOTE 2147483637

#define DATA_CHANNEL_PPID_CONTROL 50

#define DATA_CHANNEL_PPID_BINARY_PARTIAL 52

#define DATA_CHANNEL_PPID_BINARY 53

#define DATA_CHANNEL_PPID_DOMSTRING_PARTIAL 54

#define DATA_CHANNEL_PPID_DOMSTRING 51

#define DATA_CHANNEL_PPID_DOMSTRING_EMPTY 56

#define DATA_CHANNEL_PPID_BINARY_EMPTY 57

#define DATA_CHANNEL_MAX_BINARY_FRAGMENT 0x4000

#define DATA_CHANNEL_BUFFER_MESSAGE_FLAGS_TOO_LARGE 0x01

#define DATA_CHANNEL_BUFFER_MESSAGE_FLAGS_BUFFERED 0x02

#define DATA_CHANNEL_BUFFER_MESSAGE_FLAGS_COMPLETE 0x04

#define INVALID_STREAM (0xFFFF)

// max is 0xFFFF: Streams 0 to 0xFFFE = 0xFFFF streams

#define MAX_NUM_STREAMS (2048)

struct rtcweb_datachannel_open_request {

  uint8_t msg_type;  // DATA_CHANNEL_OPEN

  uint8_t channel_type;

  int16_t priority;

  uint32_t reliability_param;

  uint16_t label_length;

  uint16_t protocol_length;

  char label[1];  // (and protocol) keep VC++ happy...

} SCTP_PACKED;

struct rtcweb_datachannel_ack {

  uint8_t msg_type;  // DATA_CHANNEL_ACK

} SCTP_PACKED;

/* msg_type values: */

/* 0-1 were used in an early version of the protocol with 3-way handshakes */

#define DATA_CHANNEL_ACK 2

#define DATA_CHANNEL_OPEN_REQUEST 3

/* channel_type values: */

#define DATA_CHANNEL_RELIABLE 0x00

#define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT 0x01

#define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED 0x02

#define DATA_CHANNEL_RELIABLE_UNORDERED 0x80

#define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED 0x81

#define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED 0x82

#define ERR_DATA_CHANNEL_ALREADY_OPEN 1

#define ERR_DATA_CHANNEL_NONE_AVAILABLE 2

#if defined(_MSC_VER)

#  pragma pack(pop)

#  undef SCTP_PACKED

#endif

#endif