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Refactor ACK decoding for the different ACK types

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Summary: Separate functionality for parsing receive timestamp and ecn fields in ACKs into their own functions.

Differential Revision: D68931150

fbshipit-source-id: 8031770b118138a0002999bca52c69f96f29b617
This commit is contained in:
Joseph Beshay
2025-02-13 17:48:18 -08:00
committed by Facebook GitHub Bot
parent 015c62e964
commit cab3f2c3b4
1 changed files with 45 additions and 31 deletions
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76
quic/codec/Decode.cpp
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@@ -185,7 +185,7 @@ ReadAckFrame decodeAckFrame(
throw QuicTransportException(
"Bad largest acked",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK);
frame.frameType);
}
auto largestAcked = folly::to<PacketNum>(largestAckedInt->first);
auto ackDelay = decodeQuicInteger(cursor);
@@ -193,21 +193,21 @@ ReadAckFrame decodeAckFrame(
throw QuicTransportException(
"Bad ack delay",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK);
frame.frameType);
}
auto additionalAckBlocks = decodeQuicInteger(cursor);
if (!additionalAckBlocks) {
throw QuicTransportException(
"Bad ack block count",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK);
frame.frameType);
}
auto firstAckBlockLen = decodeQuicInteger(cursor);
if (!firstAckBlockLen) {
throw QuicTransportException(
"Bad first block",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK);
frame.frameType);
}
// Using default ack delay for long header packets. Before negotiating
// and ack delay, the sender has to use something, so they use the default
@@ -260,21 +260,16 @@ ReadAckFrame decodeAckFrame(
return frame;
}
ReadAckFrame decodeAckFrameWithReceivedTimestamps(
static void decodeReceiveTimestampsInAck(
ReadAckFrame& frame,
folly::io::Cursor& cursor,
const PacketHeader& header,
const CodecParameters& params,
FrameType frameType) {
ReadAckFrame frame;
frame = decodeAckFrame(cursor, header, params, frameType);
const CodecParameters& params) {
auto latestRecvdPacketNum = decodeQuicInteger(cursor);
if (!latestRecvdPacketNum) {
throw QuicTransportException(
"Bad latest received packet number",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK_RECEIVE_TIMESTAMPS);
frame.frameType);
}
frame.maybeLatestRecvdPacketNum = latestRecvdPacketNum->first;
@@ -283,7 +278,7 @@ ReadAckFrame decodeAckFrameWithReceivedTimestamps(
throw QuicTransportException(
"Bad receive packet timestamp delta",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK_RECEIVE_TIMESTAMPS);
frame.frameType);
}
frame.maybeLatestRecvdPacketTime =
std::chrono::microseconds(latestRecvdPacketTimeDelta->first);
@@ -293,7 +288,7 @@ ReadAckFrame decodeAckFrameWithReceivedTimestamps(
throw QuicTransportException(
"Bad receive timestamps range count",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK_RECEIVE_TIMESTAMPS);
frame.frameType);
}
for (uint64_t numRanges = 0; numRanges < timeStampRangeCount->first;
numRanges++) {
@@ -303,7 +298,7 @@ ReadAckFrame decodeAckFrameWithReceivedTimestamps(
throw QuicTransportException(
"Bad receive timestamps gap",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK_RECEIVE_TIMESTAMPS);
frame.frameType);
}
timeStampRange.gap = receiveTimeStampsGap->first;
auto receiveTimeStampsLen = decodeQuicInteger(cursor);
@@ -311,7 +306,7 @@ ReadAckFrame decodeAckFrameWithReceivedTimestamps(
throw QuicTransportException(
"Bad receive timestamps block length",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK_RECEIVE_TIMESTAMPS);
frame.frameType);
}
timeStampRange.timestamp_delta_count = receiveTimeStampsLen->first;
uint8_t receiveTimestampsExponentToUse =
@@ -325,15 +320,45 @@ ReadAckFrame decodeAckFrameWithReceivedTimestamps(
throw QuicTransportException(
"Bad receive timestamps delta",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK_RECEIVE_TIMESTAMPS);
frame.frameType);
}
DCHECK_LT(receiveTimestampsExponentToUse, sizeof(delta->first) * 8);
auto adjustedDelta = convertEncodedDurationToMicroseconds(
frameType, receiveTimestampsExponentToUse, delta->first);
frame.frameType, receiveTimestampsExponentToUse, delta->first);
timeStampRange.deltas.push_back(adjustedDelta);
}
frame.recvdPacketsTimestampRanges.emplace_back(timeStampRange);
}
}
static void decodeEcnCountsInAck(
ReadAckFrame& frame,
folly::io::Cursor& cursor) {
auto ect_0 = decodeQuicInteger(cursor);
auto ect_1 = decodeQuicInteger(cursor);
auto ce = decodeQuicInteger(cursor);
if (!ect_0 || !ect_1 || !ce) {
throw QuicTransportException(
"Bad ECN value",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
frame.frameType);
}
frame.ecnECT0Count = ect_0->first;
frame.ecnECT1Count = ect_1->first;
frame.ecnCECount = ce->first;
}
ReadAckFrame decodeAckFrameWithReceivedTimestamps(
folly::io::Cursor& cursor,
const PacketHeader& header,
const CodecParameters& params,
FrameType frameType) {
ReadAckFrame frame;
frame = decodeAckFrame(cursor, header, params, frameType);
frame.frameType = frameType;
decodeReceiveTimestampsInAck(frame, cursor, params);
return frame;
}
@@ -343,18 +368,7 @@ ReadAckFrame decodeAckFrameWithECN(
const CodecParameters& params) {
auto readAckFrame = decodeAckFrame(cursor, header, params);
readAckFrame.frameType = FrameType::ACK_ECN;
auto ect_0 = decodeQuicInteger(cursor);
auto ect_1 = decodeQuicInteger(cursor);
auto ce = decodeQuicInteger(cursor);
if (!ect_0 || !ect_1 || !ce) {
throw QuicTransportException(
"Bad ECN value",
quic::TransportErrorCode::FRAME_ENCODING_ERROR,
quic::FrameType::ACK_ECN);
}
readAckFrame.ecnECT0Count = ect_0->first;
readAckFrame.ecnECT1Count = ect_1->first;
readAckFrame.ecnCECount = ce->first;
decodeEcnCountsInAck(readAckFrame, cursor);
return readAckFrame;
}