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account for the size of the header when packing 1-RTT probe packets

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This commit is contained in:
Marten Seemann
2020-11-17 13:08:06 +07:00
parent ad8367cb43
commit 192bc8dc2a
2 changed files with 62 additions and 19 deletions
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37
packet_packer.go
View File

@@ -467,7 +467,7 @@ func (p *packetPacker) PackPacket() (*packedPacket, error) {
}, nil
}
func (p *packetPacker) maybeGetCryptoPacket(maxSize, currentSize protocol.ByteCount, encLevel protocol.EncryptionLevel) (*wire.ExtendedHeader, *payload) {
func (p *packetPacker) maybeGetCryptoPacket(maxPacketSize, currentSize protocol.ByteCount, encLevel protocol.EncryptionLevel) (*wire.ExtendedHeader, *payload) {
var s cryptoStream
var hasRetransmission bool
//nolint:exhaustive // Initial and Handshake are the only two encryption levels here.
@@ -494,19 +494,19 @@ func (p *packetPacker) maybeGetCryptoPacket(maxSize, currentSize protocol.ByteCo
if ack != nil {
payload.ack = ack
payload.length = ack.Length(p.version)
maxSize -= payload.length
maxPacketSize -= payload.length
}
hdr := p.getLongHeader(encLevel)
maxSize -= hdr.GetLength(p.version)
maxPacketSize -= hdr.GetLength(p.version)
if hasRetransmission {
for {
var f wire.Frame
//nolint:exhaustive // 0-RTT packets can't contain any retransmission.s
switch encLevel {
case protocol.EncryptionInitial:
f = p.retransmissionQueue.GetInitialFrame(maxSize)
f = p.retransmissionQueue.GetInitialFrame(maxPacketSize)
case protocol.EncryptionHandshake:
f = p.retransmissionQueue.GetHandshakeFrame(maxSize)
f = p.retransmissionQueue.GetHandshakeFrame(maxPacketSize)
}
if f == nil {
break
@@ -514,10 +514,10 @@ func (p *packetPacker) maybeGetCryptoPacket(maxSize, currentSize protocol.ByteCo
payload.frames = append(payload.frames, ackhandler.Frame{Frame: f})
frameLen := f.Length(p.version)
payload.length += frameLen
maxSize -= frameLen
maxPacketSize -= frameLen
}
} else if s.HasData() {
cf := s.PopCryptoFrame(maxSize)
cf := s.PopCryptoFrame(maxPacketSize)
payload.frames = []ackhandler.Frame{{Frame: cf}}
payload.length += cf.Length(p.version)
}
@@ -547,18 +547,19 @@ func (p *packetPacker) maybeGetAppDataPacket(maxPacketSize, currentSize protocol
}
maxPayloadSize := maxPacketSize - hdr.GetLength(p.version) - protocol.ByteCount(sealer.Overhead())
payload := p.maybeGetAppDataPacketWithEncLevel(maxPayloadSize, currentSize, encLevel)
payload := p.maybeGetAppDataPacketWithEncLevel(maxPayloadSize, encLevel == protocol.Encryption1RTT && currentSize == 0)
return sealer, hdr, payload
}
func (p *packetPacker) maybeGetAppDataPacketWithEncLevel(maxPayloadSize, currentSize protocol.ByteCount, encLevel protocol.EncryptionLevel) *payload {
payload := p.composeNextPacket(maxPayloadSize, encLevel == protocol.Encryption1RTT && currentSize == 0)
func (p *packetPacker) maybeGetAppDataPacketWithEncLevel(maxPayloadSize protocol.ByteCount, ackAllowed bool) *payload {
payload := p.composeNextPacket(maxPayloadSize, ackAllowed)
// check if we have anything to send
if len(payload.frames) == 0 && payload.ack == nil {
return nil
}
if len(payload.frames) == 0 { // the packet only contains an ACK
if len(payload.frames) == 0 {
if payload.ack == nil {
return nil
}
// the packet only contains an ACK
if p.numNonAckElicitingAcks >= protocol.MaxNonAckElicitingAcks {
ping := &wire.PingFrame{}
payload.frames = append(payload.frames, ackhandler.Frame{Frame: ping})
@@ -642,14 +643,12 @@ func (p *packetPacker) MaybePackProbePacket(encLevel protocol.EncryptionLevel) (
return nil, err
}
sealer = oneRTTSealer
payload = p.maybeGetAppDataPacketWithEncLevel(p.maxPacketSize-protocol.ByteCount(sealer.Overhead()), 0, protocol.Encryption1RTT)
if payload != nil {
hdr = p.getShortHeader(oneRTTSealer.KeyPhase())
}
hdr = p.getShortHeader(oneRTTSealer.KeyPhase())
payload = p.maybeGetAppDataPacketWithEncLevel(p.maxPacketSize-protocol.ByteCount(sealer.Overhead())-hdr.GetLength(p.version), true)
default:
panic("unknown encryption level")
}
if hdr == nil {
if payload == nil {
return nil, nil
}
size := p.packetLength(hdr, payload) + protocol.ByteCount(sealer.Overhead())

44
packet_packer_test.go
View File

@@ -1322,6 +1322,25 @@ var _ = Describe("Packet packer", func() {
parsePacket(packet.buffer.Data)
})
It("packs a full size Handshake probe packet", func() {
f := &wire.CryptoFrame{Data: make([]byte, 2000)}
retransmissionQueue.AddHandshake(f)
sealingManager.EXPECT().GetHandshakeSealer().Return(getSealer(), nil)
ackFramer.EXPECT().GetAckFrame(protocol.EncryptionHandshake, false)
handshakeStream.EXPECT().HasData()
pnManager.EXPECT().PeekPacketNumber(protocol.EncryptionHandshake).Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
pnManager.EXPECT().PopPacketNumber(protocol.EncryptionHandshake).Return(protocol.PacketNumber(0x42))
packet, err := packer.MaybePackProbePacket(protocol.EncryptionHandshake)
Expect(err).ToNot(HaveOccurred())
Expect(packet).ToNot(BeNil())
Expect(packet.EncryptionLevel()).To(Equal(protocol.EncryptionHandshake))
Expect(packet.frames).To(HaveLen(1))
Expect(packet.frames[0].Frame).To(BeAssignableToTypeOf(&wire.CryptoFrame{}))
Expect(packet.length).To(Equal(maxPacketSize))
parsePacket(packet.buffer.Data)
})
It("packs a 1-RTT probe packet", func() {
f := &wire.StreamFrame{Data: []byte("1-RTT")}
retransmissionQueue.AddInitial(f)
@@ -1341,8 +1360,33 @@ var _ = Describe("Packet packer", func() {
Expect(packet.frames[0].Frame).To(Equal(f))
})
It("packs a full size 1-RTT probe packet", func() {
f := &wire.StreamFrame{Data: make([]byte, 2000)}
retransmissionQueue.AddInitial(f)
sealingManager.EXPECT().Get1RTTSealer().Return(getSealer(), nil)
ackFramer.EXPECT().GetAckFrame(protocol.Encryption1RTT, false)
pnManager.EXPECT().PeekPacketNumber(protocol.Encryption1RTT).Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
pnManager.EXPECT().PopPacketNumber(protocol.Encryption1RTT).Return(protocol.PacketNumber(0x42))
framer.EXPECT().HasData().Return(true)
expectAppendControlFrames()
framer.EXPECT().AppendStreamFrames(gomock.Any(), gomock.Any()).DoAndReturn(func(fs []ackhandler.Frame, maxSize protocol.ByteCount) ([]ackhandler.Frame, protocol.ByteCount) {
sf, split := f.MaybeSplitOffFrame(maxSize, packer.version)
Expect(split).To(BeTrue())
return append(fs, ackhandler.Frame{Frame: sf}), sf.Length(packer.version)
})
packet, err := packer.MaybePackProbePacket(protocol.Encryption1RTT)
Expect(err).ToNot(HaveOccurred())
Expect(packet).ToNot(BeNil())
Expect(packet.EncryptionLevel()).To(Equal(protocol.Encryption1RTT))
Expect(packet.frames).To(HaveLen(1))
Expect(packet.frames[0].Frame).To(BeAssignableToTypeOf(&wire.StreamFrame{}))
Expect(packet.length).To(Equal(maxPacketSize))
})
It("returns nil if there's no probe data to send", func() {
sealingManager.EXPECT().Get1RTTSealer().Return(getSealer(), nil)
pnManager.EXPECT().PeekPacketNumber(protocol.Encryption1RTT).Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
ackFramer.EXPECT().GetAckFrame(protocol.Encryption1RTT, true)
framer.EXPECT().HasData()