sctp_proto/chunk/chunk_payload_data.rs
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use super::{chunk_header::*, chunk_type::*, *};
use std::time::Instant;
pub(crate) const PAYLOAD_DATA_ENDING_FRAGMENT_BITMASK: u8 = 1;
pub(crate) const PAYLOAD_DATA_BEGINING_FRAGMENT_BITMASK: u8 = 2;
pub(crate) const PAYLOAD_DATA_UNORDERED_BITMASK: u8 = 4;
pub(crate) const PAYLOAD_DATA_IMMEDIATE_SACK: u8 = 8;
pub(crate) const PAYLOAD_DATA_HEADER_SIZE: usize = 12;
/// PayloadProtocolIdentifier is an enum for DataChannel payload types
// PayloadProtocolIdentifier enums
// <https://www.iana.org/assignments/sctp-parameters/sctp-parameters.xhtml#sctp-parameters-25>
#[derive(Debug, Copy, Clone, PartialEq)]
#[repr(C)]
#[derive(Default)]
pub enum PayloadProtocolIdentifier {
Dcep = 50,
String = 51,
Binary = 53,
StringEmpty = 56,
BinaryEmpty = 57,
#[default]
Unknown,
}
impl fmt::Display for PayloadProtocolIdentifier {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let s = match *self {
PayloadProtocolIdentifier::Dcep => "WebRTC DCEP",
PayloadProtocolIdentifier::String => "WebRTC String",
PayloadProtocolIdentifier::Binary => "WebRTC Binary",
PayloadProtocolIdentifier::StringEmpty => "WebRTC String (Empty)",
PayloadProtocolIdentifier::BinaryEmpty => "WebRTC Binary (Empty)",
_ => "Unknown Payload Protocol Identifier",
};
write!(f, "{}", s)
}
}
impl From<u32> for PayloadProtocolIdentifier {
fn from(v: u32) -> PayloadProtocolIdentifier {
match v {
50 => PayloadProtocolIdentifier::Dcep,
51 => PayloadProtocolIdentifier::String,
53 => PayloadProtocolIdentifier::Binary,
56 => PayloadProtocolIdentifier::StringEmpty,
57 => PayloadProtocolIdentifier::BinaryEmpty,
_ => PayloadProtocolIdentifier::Unknown,
}
}
}
/// ChunkPayloadData represents an SCTP Chunk of type DATA
//
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//| Type = 0 | Reserved|U|B|E| Length |
//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//| TSN |
//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//| Stream Identifier S | Stream Sequence Number n |
//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//| Payload Protocol Identifier |
//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//| |
//| User Data (seq n of Stream S) |
//| |
//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
//
//An unfragmented user message shall have both the B and E bits set to
//'1'. Setting both B and E bits to '0' indicates a middle fragment of
//a multi-fragment user message, as summarized in the following table:
// B E Description
//============================================================
//| 1 0 | First piece of a fragmented user message |
//+----------------------------------------------------------+
//| 0 0 | Middle piece of a fragmented user message |
//+----------------------------------------------------------+
//| 0 1 | Last piece of a fragmented user message |
//+----------------------------------------------------------+
//| 1 1 | Unfragmented message |
//============================================================
//| Table 1: Fragment Description Flags |
//============================================================
#[derive(Debug, Clone)]
pub struct ChunkPayloadData {
pub(crate) unordered: bool,
pub(crate) beginning_fragment: bool,
pub(crate) ending_fragment: bool,
pub(crate) immediate_sack: bool,
pub(crate) tsn: u32,
pub(crate) stream_identifier: u16,
pub(crate) stream_sequence_number: u16,
pub(crate) payload_type: PayloadProtocolIdentifier,
pub(crate) user_data: Bytes,
/// Whether this data chunk was acknowledged (received by peer)
pub(crate) acked: bool,
pub(crate) miss_indicator: u32,
/// Partial-reliability parameters used only by sender
pub(crate) since: Option<Instant>,
/// number of transmission made for this chunk
pub(crate) nsent: u32,
/// valid only with the first fragment
pub(crate) abandoned: bool,
/// valid only with the first fragment
pub(crate) all_inflight: bool,
/// Retransmission flag set when T1-RTX timeout occurred and this
/// chunk is still in the inflight queue
pub(crate) retransmit: bool,
}
impl Default for ChunkPayloadData {
fn default() -> Self {
ChunkPayloadData {
unordered: false,
beginning_fragment: false,
ending_fragment: false,
immediate_sack: false,
tsn: 0,
stream_identifier: 0,
stream_sequence_number: 0,
payload_type: PayloadProtocolIdentifier::default(),
user_data: Bytes::new(),
acked: false,
miss_indicator: 0,
since: None,
nsent: 0,
abandoned: false,
all_inflight: false,
retransmit: false,
}
}
}
/// makes chunkPayloadData printable
impl fmt::Display for ChunkPayloadData {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}\n{}", self.header(), self.tsn)
}
}
impl Chunk for ChunkPayloadData {
fn header(&self) -> ChunkHeader {
let mut flags: u8 = 0;
if self.ending_fragment {
flags = 1;
}
if self.beginning_fragment {
flags |= 1 << 1;
}
if self.unordered {
flags |= 1 << 2;
}
if self.immediate_sack {
flags |= 1 << 3;
}
ChunkHeader {
typ: CT_PAYLOAD_DATA,
flags,
value_length: self.value_length() as u16,
}
}
fn unmarshal(raw: &Bytes) -> Result<Self> {
let header = ChunkHeader::unmarshal(raw)?;
if header.typ != CT_PAYLOAD_DATA {
return Err(Error::ErrChunkTypeNotPayloadData);
}
let immediate_sack = (header.flags & PAYLOAD_DATA_IMMEDIATE_SACK) != 0;
let unordered = (header.flags & PAYLOAD_DATA_UNORDERED_BITMASK) != 0;
let beginning_fragment = (header.flags & PAYLOAD_DATA_BEGINING_FRAGMENT_BITMASK) != 0;
let ending_fragment = (header.flags & PAYLOAD_DATA_ENDING_FRAGMENT_BITMASK) != 0;
if raw.len() < PAYLOAD_DATA_HEADER_SIZE {
return Err(Error::ErrChunkPayloadSmall);
}
let reader = &mut raw.slice(CHUNK_HEADER_SIZE..CHUNK_HEADER_SIZE + header.value_length());
let tsn = reader.get_u32();
let stream_identifier = reader.get_u16();
let stream_sequence_number = reader.get_u16();
let payload_type: PayloadProtocolIdentifier = reader.get_u32().into();
let user_data = raw.slice(
CHUNK_HEADER_SIZE + PAYLOAD_DATA_HEADER_SIZE..CHUNK_HEADER_SIZE + header.value_length(),
);
Ok(ChunkPayloadData {
unordered,
beginning_fragment,
ending_fragment,
immediate_sack,
tsn,
stream_identifier,
stream_sequence_number,
payload_type,
user_data,
acked: false,
miss_indicator: 0,
since: None,
nsent: 0,
abandoned: false,
all_inflight: false,
retransmit: false,
})
}
fn marshal_to(&self, writer: &mut BytesMut) -> Result<usize> {
self.header().marshal_to(writer)?;
writer.put_u32(self.tsn);
writer.put_u16(self.stream_identifier);
writer.put_u16(self.stream_sequence_number);
writer.put_u32(self.payload_type as u32);
writer.extend_from_slice(&self.user_data);
Ok(writer.len())
}
fn check(&self) -> Result<()> {
Ok(())
}
fn value_length(&self) -> usize {
PAYLOAD_DATA_HEADER_SIZE + self.user_data.len()
}
fn as_any(&self) -> &(dyn Any + Send + Sync) {
self
}
}
impl ChunkPayloadData {
pub(crate) fn abandoned(&self) -> bool {
self.abandoned && self.all_inflight
}
pub(crate) fn set_abandoned(&mut self, abandoned: bool) {
self.abandoned = abandoned;
}
pub(crate) fn set_all_inflight(&mut self) {
if self.ending_fragment {
self.all_inflight = true;
}
}
}