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packet packer: don't try packing a 0-RTT packet with only an ACK (#3849)

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0-RTT packets can't contain ACK frames. This was correctly reflected in the
code path for packing a 0-RTT packet, but we would ignore the ACK-only flag
when packing the coalesced packet, leading to a full-size 0-RTT packet being
sent out when we're only allowed to send an ACK-only packet.
This commit is contained in:
Marten Seemann 2023-05-28 17:35:32 +03:00 • committed by GitHub
parent f5516715eb
commit 762d5c2c9c
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2 changed files with 7 additions and 1 deletions
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packet_packer.go
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@ -417,7 +417,7 @@ func (p *packetPacker) PackCoalescedPacket(onlyAck bool, v protocol.VersionNumbe
if oneRTTPayload.length > 0 {
size += p.shortHeaderPacketLength(connID, oneRTTPacketNumberLen, oneRTTPayload) + protocol.ByteCount(oneRTTSealer.Overhead())
}
} else if p.perspective == protocol.PerspectiveClient { // 0-RTT
} else if p.perspective == protocol.PerspectiveClient && !onlyAck { // 0-RTT packets can't contain ACK frames
var err error
zeroRTTSealer, err = p.cryptoSetup.Get0RTTSealer()
if err != nil && err != handshake.ErrKeysDropped && err != handshake.ErrKeysNotYetAvailable {