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remove incorrect error check when sending a packet

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There's no need for a check if more than protocol.MaxTrackedSentPackets
packets were sent. There are certain situations where we allow (via
SendingAllowed()) sending of more packets, and we shouldn't throw an
error when the session then actually sends these packets.
This commit is contained in:
Marten Seemann 2018-03-05 17:08:18 +07:00
parent ba00cb9175
commit 2d64953e0e
6 changed files with 43 additions and 104 deletions
Download patch file Download diff file Expand all files Collapse all files

2
internal/ackhandler/interfaces.go
View file

@ -10,7 +10,7 @@ import (
// SentPacketHandler handles ACKs received for outgoing packets
type SentPacketHandler interface {
// SentPacket may modify the packet
SentPacket(packet *Packet) error
SentPacket(packet *Packet)
ReceivedAck(ackFrame *wire.AckFrame, withPacketNumber protocol.PacketNumber, encLevel protocol.EncryptionLevel, recvTime time.Time) error
SetHandshakeComplete()

10
internal/ackhandler/sent_packet_handler.go
View file

@ -112,14 +112,9 @@ func (h *sentPacketHandler) SetHandshakeComplete() {
h.handshakeComplete = true
}
func (h *sentPacketHandler) SentPacket(packet *Packet) error {
if protocol.PacketNumber(len(h.retransmissionQueue)+h.packetHistory.Len()+1) > protocol.MaxTrackedSentPackets {
return errors.New("Too many outstanding non-acked and non-retransmitted packets")
}
func (h *sentPacketHandler) SentPacket(packet *Packet) {
for p := h.lastSentPacketNumber + 1; p < packet.PacketNumber; p++ {
h.skippedPackets = append(h.skippedPackets, p)
if len(h.skippedPackets) > protocol.MaxTrackedSkippedPackets {
h.skippedPackets = h.skippedPackets[1:]
}
@ -144,7 +139,6 @@ func (h *sentPacketHandler) SentPacket(packet *Packet) error {
h.bytesInFlight += packet.Length
h.packetHistory.PushBack(*packet)
}
h.congestion.OnPacketSent(
now,
h.bytesInFlight,
@ -154,9 +148,7 @@ func (h *sentPacketHandler) SentPacket(packet *Packet) error {
)
h.nextPacketSendTime = utils.MaxTime(h.nextPacketSendTime, now).Add(h.congestion.TimeUntilSend(h.bytesInFlight))
h.updateLossDetectionAlarm(now)
return nil
}
func (h *sentPacketHandler) ReceivedAck(ackFrame *wire.AckFrame, withPacketNumber protocol.PacketNumber, encLevel protocol.EncryptionLevel, rcvTime time.Time) error {

121
internal/ackhandler/sent_packet_handler_test.go
View file

@ -68,10 +68,8 @@ var _ = Describe("SentPacketHandler", func() {
It("accepts two consecutive packets", func() {
packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
packet2 := Packet{PacketNumber: 2, Frames: []wire.Frame{&streamFrame}, Length: 2}
err := handler.SentPacket(&packet1)
Expect(err).ToNot(HaveOccurred())
err = handler.SentPacket(&packet2)
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&packet1)
handler.SentPacket(&packet2)
Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(2)))
Expect(handler.packetHistory.Front().Value.PacketNumber).To(Equal(protocol.PacketNumber(1)))
Expect(handler.packetHistory.Back().Value.PacketNumber).To(Equal(protocol.PacketNumber(2)))
@ -82,11 +80,9 @@ var _ = Describe("SentPacketHandler", func() {
It("accepts packet number 0", func() {
packet1 := Packet{PacketNumber: 0, Frames: []wire.Frame{&streamFrame}, Length: 1}
packet2 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 2}
err := handler.SentPacket(&packet1)
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&packet1)
Expect(handler.lastSentPacketNumber).To(BeZero())
err = handler.SentPacket(&packet2)
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&packet2)
Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(1)))
Expect(handler.packetHistory.Front().Value.PacketNumber).To(Equal(protocol.PacketNumber(0)))
Expect(handler.packetHistory.Back().Value.PacketNumber).To(Equal(protocol.PacketNumber(1)))
@ -96,14 +92,12 @@ var _ = Describe("SentPacketHandler", func() {
It("stores the sent time", func() {
packet := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
err := handler.SentPacket(&packet)
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&packet)
Expect(handler.packetHistory.Front().Value.sendTime.Unix()).To(BeNumerically("~", time.Now().Unix(), 1))
})
It("does not store non-retransmittable packets", func() {
err := handler.SentPacket(&Packet{PacketNumber: 1, Length: 1})
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&Packet{PacketNumber: 1, Length: 1})
Expect(handler.packetHistory.Len()).To(BeZero())
})
@ -111,10 +105,8 @@ var _ = Describe("SentPacketHandler", func() {
It("works with non-consecutive packet numbers", func() {
packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
packet2 := Packet{PacketNumber: 3, Frames: []wire.Frame{&streamFrame}, Length: 2}
err := handler.SentPacket(&packet1)
Expect(err).ToNot(HaveOccurred())
err = handler.SentPacket(&packet2)
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&packet1)
handler.SentPacket(&packet2)
Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(3)))
el := handler.packetHistory.Front()
Expect(el.Value.PacketNumber).To(Equal(protocol.PacketNumber(1)))
@ -129,12 +121,9 @@ var _ = Describe("SentPacketHandler", func() {
packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
packet2 := Packet{PacketNumber: 3, Frames: []wire.Frame{&streamFrame}, Length: 2}
packet3 := Packet{PacketNumber: 5, Frames: []wire.Frame{&streamFrame}, Length: 2}
err := handler.SentPacket(&packet1)
Expect(err).ToNot(HaveOccurred())
err = handler.SentPacket(&packet2)
Expect(err).ToNot(HaveOccurred())
err = handler.SentPacket(&packet3)
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&packet1)
handler.SentPacket(&packet2)
handler.SentPacket(&packet3)
Expect(handler.skippedPackets).To(HaveLen(2))
Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2, 4}))
})
@ -142,10 +131,8 @@ var _ = Describe("SentPacketHandler", func() {
It("recognizes multiple consecutive skipped packets", func() {
packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
packet2 := Packet{PacketNumber: 4, Frames: []wire.Frame{&streamFrame}, Length: 2}
err := handler.SentPacket(&packet1)
Expect(err).ToNot(HaveOccurred())
err = handler.SentPacket(&packet2)
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&packet1)
handler.SentPacket(&packet2)
Expect(handler.skippedPackets).To(HaveLen(2))
Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2, 3}))
})
@ -153,8 +140,7 @@ var _ = Describe("SentPacketHandler", func() {
It("limits the lengths of the skipped packet slice", func() {
for i := 0; i < protocol.MaxTrackedSkippedPackets+5; i++ {
packet := Packet{PacketNumber: protocol.PacketNumber(2*i + 1), Frames: []wire.Frame{&streamFrame}, Length: 1}
err := handler.SentPacket(&packet)
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(&packet)
}
Expect(handler.skippedPackets).To(HaveLen(protocol.MaxUndecryptablePackets))
Expect(handler.skippedPackets[0]).To(Equal(protocol.PacketNumber(10)))
@ -186,20 +172,6 @@ var _ = Describe("SentPacketHandler", func() {
})
})
Context("DoS mitigation", func() {
It("checks the size of the packet history, for unacked packets", func() {
i := protocol.PacketNumber(1)
for ; i <= protocol.MaxTrackedSentPackets; i++ {
err := handler.SentPacket(retransmittablePacket(i))
Expect(err).ToNot(HaveOccurred())
}
err := handler.SentPacket(retransmittablePacket(i))
Expect(err).To(MatchError("Too many outstanding non-acked and non-retransmitted packets"))
})
// TODO: add a test that the length of the retransmission queue is considered, even if packets have already been ACKed. Relevant once we drop support for QUIC 33 and earlier
})
Context("ACK processing", func() {
var packets []*Packet
@ -219,8 +191,7 @@ var _ = Describe("SentPacketHandler", func() {
{PacketNumber: 12, Frames: []wire.Frame{&streamFrame}, Length: 1},
}
for _, packet := range packets {
err := handler.SentPacket(packet)
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(packet)
}
// Increase RTT, because the tests would be flaky otherwise
handler.rttStats.UpdateRTT(time.Hour, 0, time.Now())
@ -327,7 +298,7 @@ var _ = Describe("SentPacketHandler", func() {
})
It("rejects an ACK that acks packets with a higher encryption level", func() {
err := handler.SentPacket(&Packet{
handler.SentPacket(&Packet{
PacketNumber: 13,
EncryptionLevel: protocol.EncryptionForwardSecure,
Frames: []wire.Frame{&streamFrame},
@ -337,8 +308,7 @@ var _ = Describe("SentPacketHandler", func() {
LargestAcked: 13,
LowestAcked: 13,
}
Expect(err).ToNot(HaveOccurred())
err = handler.ReceivedAck(&ack, 1, protocol.EncryptionSecure, time.Now())
err := handler.ReceivedAck(&ack, 1, protocol.EncryptionSecure, time.Now())
Expect(err).To(MatchError("Received ACK with encryption level encrypted (not forward-secure) that acks a packet 13 (encryption level forward-secure)"))
})
@ -518,8 +488,7 @@ var _ = Describe("SentPacketHandler", func() {
{PacketNumber: 15, Frames: []wire.Frame{&streamFrame}, Length: 1},
}
for _, packet := range morePackets {
err := handler.SentPacket(packet)
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(packet)
}
})
@ -625,14 +594,11 @@ var _ = Describe("SentPacketHandler", func() {
packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
packet2 := Packet{PacketNumber: 2, Frames: []wire.Frame{&streamFrame}, Length: 2}
packet3 := Packet{PacketNumber: 3, Frames: []wire.Frame{&streamFrame}, Length: 3}
err := handler.SentPacket(&packet1)
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(&packet1)
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(1)))
err = handler.SentPacket(&packet2)
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(&packet2)
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(1 + 2)))
err = handler.SentPacket(&packet3)
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(&packet3)
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(1 + 2 + 3)))
// Increase RTT, because the tests would be flaky otherwise
@ -647,8 +613,7 @@ var _ = Describe("SentPacketHandler", func() {
{First: 1, Last: 1},
},
}
err = handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
Expect(err).NotTo(HaveOccurred())
handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(2)))
handler.packetHistory.Front().Value.sendTime = time.Now().Add(-time.Hour)
@ -680,8 +645,7 @@ var _ = Describe("SentPacketHandler", func() {
Length: 42,
Frames: []wire.Frame{&wire.PingFrame{}},
}
err := handler.SentPacket(p)
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(p)
})
It("should call MaybeExitSlowStart and OnPacketAcked", func() {
@ -805,13 +769,11 @@ var _ = Describe("SentPacketHandler", func() {
Context("Delay-based loss detection", func() {
It("detects a packet as lost", func() {
err := handler.SentPacket(retransmittablePacket(1))
Expect(err).NotTo(HaveOccurred())
err = handler.SentPacket(retransmittablePacket(2))
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(retransmittablePacket(1))
handler.SentPacket(retransmittablePacket(2))
Expect(handler.lossTime.IsZero()).To(BeTrue())
err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 2, LowestAcked: 2}, 1, protocol.EncryptionForwardSecure, time.Now().Add(time.Hour))
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 2, LowestAcked: 2}, 1, protocol.EncryptionForwardSecure, time.Now().Add(time.Hour))
Expect(err).NotTo(HaveOccurred())
Expect(handler.lossTime.IsZero()).To(BeFalse())
@ -826,15 +788,12 @@ var _ = Describe("SentPacketHandler", func() {
})
It("does not detect packets as lost without ACKs", func() {
err := handler.SentPacket(nonRetransmittablePacket(1))
Expect(err).NotTo(HaveOccurred())
err = handler.SentPacket(retransmittablePacket(2))
Expect(err).NotTo(HaveOccurred())
err = handler.SentPacket(retransmittablePacket(3))
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(nonRetransmittablePacket(1))
handler.SentPacket(retransmittablePacket(2))
handler.SentPacket(retransmittablePacket(3))
Expect(handler.lossTime.IsZero()).To(BeTrue())
err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1, LowestAcked: 1}, 1, protocol.EncryptionUnencrypted, time.Now().Add(time.Hour))
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1, LowestAcked: 1}, 1, protocol.EncryptionUnencrypted, time.Now().Add(time.Hour))
Expect(err).NotTo(HaveOccurred())
Expect(handler.lossTime.IsZero()).To(BeTrue())
Expect(time.Until(handler.GetAlarmTimeout())).To(BeNumerically("~", handler.computeRTOTimeout(), time.Minute))
@ -855,16 +814,12 @@ var _ = Describe("SentPacketHandler", func() {
It("detects the handshake timeout", func() {
// send handshake packets: 1, 2, 4
// send a forward-secure packet: 3
err := handler.SentPacket(handshakePacket(1))
Expect(err).ToNot(HaveOccurred())
err = handler.SentPacket(handshakePacket(2))
Expect(err).ToNot(HaveOccurred())
err = handler.SentPacket(retransmittablePacket(3))
Expect(err).ToNot(HaveOccurred())
err = handler.SentPacket(handshakePacket(4))
Expect(err).ToNot(HaveOccurred())
handler.SentPacket(handshakePacket(1))
handler.SentPacket(handshakePacket(2))
handler.SentPacket(retransmittablePacket(3))
handler.SentPacket(handshakePacket(4))
err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1, LowestAcked: 1}, 1, protocol.EncryptionSecure, time.Now())
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1, LowestAcked: 1}, 1, protocol.EncryptionSecure, time.Now())
Expect(err).NotTo(HaveOccurred())
Expect(handler.lossTime.IsZero()).To(BeTrue())
handshakeTimeout := handler.computeHandshakeTimeout()
@ -887,10 +842,8 @@ var _ = Describe("SentPacketHandler", func() {
Context("RTO retransmission", func() {
It("queues two packets if RTO expires", func() {
err := handler.SentPacket(retransmittablePacket(1))
Expect(err).NotTo(HaveOccurred())
err = handler.SentPacket(retransmittablePacket(2))
Expect(err).NotTo(HaveOccurred())
handler.SentPacket(retransmittablePacket(1))
handler.SentPacket(retransmittablePacket(2))
handler.rttStats.UpdateRTT(time.Hour, 0, time.Now())
Expect(handler.lossTime.IsZero()).To(BeTrue())

6
internal/mocks/ackhandler/sent_packet_handler.go
View file

@ -132,10 +132,8 @@ func (mr *MockSentPacketHandlerMockRecorder) SendingAllowed() *gomock.Call {
}
// SentPacket mocks base method
func (m *MockSentPacketHandler) SentPacket(arg0 *ackhandler.Packet) error {
ret := m.ctrl.Call(m, "SentPacket", arg0)
ret0, _ := ret[0].(error)
return ret0
func (m *MockSentPacketHandler) SentPacket(arg0 *ackhandler.Packet) {
m.ctrl.Call(m, "SentPacket", arg0)
}
// SentPacket indicates an expected call of SentPacket

5
session.go
View file

@ -877,16 +877,13 @@ func (s *session) sendPacket() (bool, error) {
func (s *session) sendPackedPacket(packet *packedPacket) error {
defer putPacketBuffer(&packet.raw)
err := s.sentPacketHandler.SentPacket(&ackhandler.Packet{
s.sentPacketHandler.SentPacket(&ackhandler.Packet{
PacketNumber: packet.header.PacketNumber,
PacketType: packet.header.Type,
Frames: packet.frames,
Length: protocol.ByteCount(len(packet.raw)),
EncryptionLevel: packet.encryptionLevel,
})
if err != nil {
return err
}
s.logPacket(packet)
return s.conn.Write(packet.raw)
}

3
session_test.go
View file

@ -1091,7 +1091,7 @@ var _ = Describe("Session", func() {
Expect(sess.rttStats.SmoothedRTT()).To(Equal(rtt)) // make sure it worked
sess.packer.packetNumberGenerator.next = n + 1
// Now, we send a single packet, and expect that it was retransmitted later
err := sess.sentPacketHandler.SentPacket(&ackhandler.Packet{
sess.sentPacketHandler.SentPacket(&ackhandler.Packet{
PacketNumber: n,
Length: 1,
Frames: []wire.Frame{&wire.StreamFrame{
@ -1099,7 +1099,6 @@ var _ = Describe("Session", func() {
}},
EncryptionLevel: protocol.EncryptionForwardSecure,
})
Expect(err).NotTo(HaveOccurred())
go sess.run()
defer sess.Close(nil)
sess.scheduleSending()