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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
// Duplicated in fsm.def
#define WEBRTC_DATACHANNEL_STREAMS_DEFAULT 256
#define DATA_CHANNEL_PPID_CONTROL 50
#define DATA_CHANNEL_PPID_BINARY 52
#define DATA_CHANNEL_PPID_BINARY_LAST 53
#define DATA_CHANNEL_PPID_DOMSTRING 54
#define DATA_CHANNEL_PPID_DOMSTRING_LAST 51
#define DATA_CHANNEL_MAX_BINARY_FRAGMENT 0x4000
#define DATA_CHANNEL_FLAGS_SEND_REQ 0x00000001
#define DATA_CHANNEL_FLAGS_SEND_RSP 0x00000002
#define DATA_CHANNEL_FLAGS_SEND_ACK 0x00000004
#define DATA_CHANNEL_FLAGS_OUT_OF_ORDER_ALLOWED 0x00000008
#define DATA_CHANNEL_FLAGS_SEND_DATA 0x00000010
#define DATA_CHANNEL_FLAGS_FINISH_OPEN 0x00000020
#define DATA_CHANNEL_FLAGS_FINISH_RSP 0x00000040
#define DATA_CHANNEL_FLAGS_EXTERNAL_NEGOTIATED 0x00000080
#define DATA_CHANNEL_FLAGS_WAITING_ACK 0x00000100
#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
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