907 lines
36 KiB
Go
907 lines
36 KiB
Go
package ackhandler
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import (
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"time"
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"github.com/golang/mock/gomock"
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"github.com/lucas-clemente/quic-go/congestion"
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"github.com/lucas-clemente/quic-go/internal/mocks"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/wire"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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func retransmittablePacket(num protocol.PacketNumber) *Packet {
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return &Packet{
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PacketNumber: num,
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Length: 1,
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Frames: []wire.Frame{&wire.PingFrame{}},
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EncryptionLevel: protocol.EncryptionForwardSecure,
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}
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}
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func nonRetransmittablePacket(num protocol.PacketNumber) *Packet {
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return &Packet{PacketNumber: num, Length: 1, Frames: []wire.Frame{&wire.AckFrame{}}}
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}
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func handshakePacket(num protocol.PacketNumber) *Packet {
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return &Packet{
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PacketNumber: num,
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Length: 1,
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Frames: []wire.Frame{&wire.PingFrame{}},
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EncryptionLevel: protocol.EncryptionUnencrypted,
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}
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}
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var _ = Describe("SentPacketHandler", func() {
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var (
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handler *sentPacketHandler
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streamFrame wire.StreamFrame
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)
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BeforeEach(func() {
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rttStats := &congestion.RTTStats{}
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handler = NewSentPacketHandler(rttStats).(*sentPacketHandler)
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handler.SetHandshakeComplete()
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streamFrame = wire.StreamFrame{
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StreamID: 5,
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Data: []byte{0x13, 0x37},
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}
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})
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getPacketElement := func(p protocol.PacketNumber) *PacketElement {
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for el := handler.packetHistory.Front(); el != nil; el = el.Next() {
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if el.Value.PacketNumber == p {
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return el
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}
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}
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return nil
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}
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It("gets the LeastUnacked packet number", func() {
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handler.largestAcked = 0x1337
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Expect(handler.GetLeastUnacked()).To(Equal(protocol.PacketNumber(0x1337 + 1)))
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})
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Context("registering sent packets", func() {
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It("accepts two consecutive packets", func() {
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packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
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packet2 := Packet{PacketNumber: 2, Frames: []wire.Frame{&streamFrame}, Length: 2}
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err := handler.SentPacket(&packet1)
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Expect(err).ToNot(HaveOccurred())
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err = handler.SentPacket(&packet2)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(2)))
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Expect(handler.packetHistory.Front().Value.PacketNumber).To(Equal(protocol.PacketNumber(1)))
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Expect(handler.packetHistory.Back().Value.PacketNumber).To(Equal(protocol.PacketNumber(2)))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(3)))
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Expect(handler.skippedPackets).To(BeEmpty())
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})
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It("accepts packet number 0", func() {
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packet1 := Packet{PacketNumber: 0, Frames: []wire.Frame{&streamFrame}, Length: 1}
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packet2 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 2}
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err := handler.SentPacket(&packet1)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.lastSentPacketNumber).To(BeZero())
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err = handler.SentPacket(&packet2)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(1)))
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Expect(handler.packetHistory.Front().Value.PacketNumber).To(Equal(protocol.PacketNumber(0)))
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Expect(handler.packetHistory.Back().Value.PacketNumber).To(Equal(protocol.PacketNumber(1)))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(3)))
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Expect(handler.skippedPackets).To(BeEmpty())
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})
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It("stores the sent time", func() {
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packet := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
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err := handler.SentPacket(&packet)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.packetHistory.Front().Value.sendTime.Unix()).To(BeNumerically("~", time.Now().Unix(), 1))
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})
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It("does not store non-retransmittable packets", func() {
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err := handler.SentPacket(&Packet{PacketNumber: 1, Length: 1})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.packetHistory.Len()).To(BeZero())
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})
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Context("skipped packet numbers", func() {
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It("works with non-consecutive packet numbers", func() {
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packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
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packet2 := Packet{PacketNumber: 3, Frames: []wire.Frame{&streamFrame}, Length: 2}
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err := handler.SentPacket(&packet1)
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Expect(err).ToNot(HaveOccurred())
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err = handler.SentPacket(&packet2)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(3)))
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el := handler.packetHistory.Front()
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Expect(el.Value.PacketNumber).To(Equal(protocol.PacketNumber(1)))
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el = el.Next()
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Expect(el.Value.PacketNumber).To(Equal(protocol.PacketNumber(3)))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(3)))
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Expect(handler.skippedPackets).To(HaveLen(1))
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Expect(handler.skippedPackets[0]).To(Equal(protocol.PacketNumber(2)))
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})
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It("recognizes multiple skipped packets", func() {
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packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
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packet2 := Packet{PacketNumber: 3, Frames: []wire.Frame{&streamFrame}, Length: 2}
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packet3 := Packet{PacketNumber: 5, Frames: []wire.Frame{&streamFrame}, Length: 2}
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err := handler.SentPacket(&packet1)
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Expect(err).ToNot(HaveOccurred())
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err = handler.SentPacket(&packet2)
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Expect(err).ToNot(HaveOccurred())
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err = handler.SentPacket(&packet3)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.skippedPackets).To(HaveLen(2))
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2, 4}))
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})
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It("recognizes multiple consecutive skipped packets", func() {
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packet1 := Packet{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1}
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packet2 := Packet{PacketNumber: 4, Frames: []wire.Frame{&streamFrame}, Length: 2}
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err := handler.SentPacket(&packet1)
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Expect(err).ToNot(HaveOccurred())
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err = handler.SentPacket(&packet2)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.skippedPackets).To(HaveLen(2))
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2, 3}))
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})
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It("limits the lengths of the skipped packet slice", func() {
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for i := 0; i < protocol.MaxTrackedSkippedPackets+5; i++ {
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packet := Packet{PacketNumber: protocol.PacketNumber(2*i + 1), Frames: []wire.Frame{&streamFrame}, Length: 1}
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err := handler.SentPacket(&packet)
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Expect(err).ToNot(HaveOccurred())
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}
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Expect(handler.skippedPackets).To(HaveLen(protocol.MaxUndecryptablePackets))
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Expect(handler.skippedPackets[0]).To(Equal(protocol.PacketNumber(10)))
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Expect(handler.skippedPackets[protocol.MaxTrackedSkippedPackets-1]).To(Equal(protocol.PacketNumber(10 + 2*(protocol.MaxTrackedSkippedPackets-1))))
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})
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Context("garbage collection", func() {
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It("keeps all packet numbers above the LargestAcked", func() {
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handler.skippedPackets = []protocol.PacketNumber{2, 5, 8, 10}
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handler.largestAcked = 1
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handler.garbageCollectSkippedPackets()
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2, 5, 8, 10}))
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})
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It("doesn't keep packet numbers below the LargestAcked", func() {
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handler.skippedPackets = []protocol.PacketNumber{1, 5, 8, 10}
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handler.largestAcked = 5
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handler.garbageCollectSkippedPackets()
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{8, 10}))
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})
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It("deletes all packet numbers if LargestAcked is sufficiently high", func() {
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handler.skippedPackets = []protocol.PacketNumber{1, 5, 10}
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handler.largestAcked = 15
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handler.garbageCollectSkippedPackets()
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Expect(handler.skippedPackets).To(BeEmpty())
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})
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})
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})
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})
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Context("forcing retransmittable packets", func() {
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It("says that every 20th packet should be retransmittable", func() {
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// send 19 non-retransmittable packets
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for i := 1; i <= protocol.MaxNonRetransmittablePackets; i++ {
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Expect(handler.ShouldSendRetransmittablePacket()).To(BeFalse())
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err := handler.SentPacket(nonRetransmittablePacket(protocol.PacketNumber(i)))
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Expect(err).ToNot(HaveOccurred())
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}
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Expect(handler.ShouldSendRetransmittablePacket()).To(BeTrue())
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})
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It("resets the counter when a retransmittable packet is sent", func() {
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// send 19 non-retransmittable packets
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for i := 1; i <= protocol.MaxNonRetransmittablePackets; i++ {
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Expect(handler.ShouldSendRetransmittablePacket()).To(BeFalse())
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err := handler.SentPacket(nonRetransmittablePacket(protocol.PacketNumber(i)))
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.SentPacket(retransmittablePacket(20))
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.ShouldSendRetransmittablePacket()).To(BeFalse())
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})
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})
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Context("DoS mitigation", func() {
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It("checks the size of the packet history, for unacked packets", func() {
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i := protocol.PacketNumber(1)
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for ; i <= protocol.MaxTrackedSentPackets; i++ {
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err := handler.SentPacket(retransmittablePacket(i))
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.SentPacket(retransmittablePacket(i))
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Expect(err).To(MatchError("Too many outstanding non-acked and non-retransmitted packets"))
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})
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// 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
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})
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Context("ACK processing", func() {
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var packets []*Packet
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BeforeEach(func() {
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packets = []*Packet{
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{PacketNumber: 0, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 2, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 3, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 4, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 5, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 6, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 7, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 8, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 9, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 10, Frames: []wire.Frame{&streamFrame}, Length: 1},
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{PacketNumber: 12, Frames: []wire.Frame{&streamFrame}, Length: 1},
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}
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for _, packet := range packets {
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err := handler.SentPacket(packet)
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Expect(err).NotTo(HaveOccurred())
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}
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// Increase RTT, because the tests would be flaky otherwise
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handler.rttStats.UpdateRTT(time.Hour, 0, time.Now())
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets))))
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})
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expectInPacketHistory := func(expected []protocol.PacketNumber) {
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var packets []protocol.PacketNumber
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for el := handler.packetHistory.Front(); el != nil; el = el.Next() {
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packets = append(packets, el.Value.PacketNumber)
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}
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ExpectWithOffset(1, packets).To(Equal(expected))
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}
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Context("ACK validation", func() {
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It("rejects duplicate ACKs", func() {
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largestAcked := 3
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ack := wire.AckFrame{
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LargestAcked: protocol.PacketNumber(largestAcked),
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LowestAcked: 1,
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}
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err := handler.ReceivedAck(&ack, 1337, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 3)))
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err = handler.ReceivedAck(&ack, 1337, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).To(MatchError(ErrDuplicateOrOutOfOrderAck))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 3)))
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})
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It("rejects out of order ACKs", func() {
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// acks packets 0, 1, 2, 3
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ack := wire.AckFrame{LargestAcked: 3}
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err := handler.ReceivedAck(&ack, 1337, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 4)))
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err = handler.ReceivedAck(&ack, 1337-1, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).To(MatchError(ErrDuplicateOrOutOfOrderAck))
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(3)))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 4)))
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})
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It("rejects ACKs with a too high LargestAcked packet number", func() {
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ack := wire.AckFrame{
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LargestAcked: packets[len(packets)-1].PacketNumber + 1337,
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}
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err := handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).To(MatchError("InvalidAckData: Received ACK for an unsent package"))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets))))
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})
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It("ignores repeated ACKs", func() {
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ack := wire.AckFrame{
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LargestAcked: 3,
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LowestAcked: 1,
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}
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err := handler.ReceivedAck(&ack, 1337, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 3)))
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err = handler.ReceivedAck(&ack, 1337+1, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(3)))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 3)))
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})
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It("rejects ACKs for skipped packets", func() {
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ack := wire.AckFrame{
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LargestAcked: 12,
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LowestAcked: 5,
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}
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err := handler.ReceivedAck(&ack, 1337, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).To(MatchError("InvalidAckData: Received an ACK for a skipped packet number"))
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})
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It("accepts an ACK that correctly nacks a skipped packet", func() {
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ack := wire.AckFrame{
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LargestAcked: 12,
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LowestAcked: 5,
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AckRanges: []wire.AckRange{
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{First: 12, Last: 12},
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{First: 5, Last: 10},
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},
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}
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err := handler.ReceivedAck(&ack, 1337, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).ToNot(BeZero())
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})
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})
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Context("acks and nacks the right packets", func() {
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It("adjusts the LargestAcked", func() {
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ack := wire.AckFrame{
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LargestAcked: 5,
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LowestAcked: 0,
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}
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err := handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(5)))
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el := handler.packetHistory.Front()
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for i := 6; i <= 10; i++ {
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Expect(el.Value.PacketNumber).To(Equal(protocol.PacketNumber(i)))
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el = el.Next()
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}
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Expect(el.Value.PacketNumber).To(Equal(protocol.PacketNumber(12)))
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})
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It("rejects an ACK that acks packets with a higher encryption level", func() {
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err := handler.SentPacket(&Packet{
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PacketNumber: 13,
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EncryptionLevel: protocol.EncryptionForwardSecure,
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Frames: []wire.Frame{&streamFrame},
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Length: 1,
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})
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ack := wire.AckFrame{
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LargestAcked: 13,
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LowestAcked: 13,
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}
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedAck(&ack, 1, protocol.EncryptionSecure, time.Now())
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Expect(err).To(MatchError("Received ACK with encryption level encrypted (not forward-secure) that acks a packet 13 (encryption level forward-secure)"))
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})
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It("acks all packets for an ACK frame with no missing packets", func() {
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ack := wire.AckFrame{
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LargestAcked: 8,
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LowestAcked: 1,
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}
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err := handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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el := handler.packetHistory.Front()
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Expect(el.Value.PacketNumber).To(Equal(protocol.PacketNumber(0)))
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el = el.Next()
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Expect(el.Value.PacketNumber).To(Equal(protocol.PacketNumber(9)))
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el = el.Next()
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Expect(el.Value.PacketNumber).To(Equal(protocol.PacketNumber(10)))
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Expect(el.Next().Value.PacketNumber).To(Equal(protocol.PacketNumber(12)))
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})
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It("acks packet 0", func() {
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ack := wire.AckFrame{
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LargestAcked: 0,
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LowestAcked: 0,
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}
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err := handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12})
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})
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It("handles an ACK frame with one missing packet range", func() {
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ack := wire.AckFrame{
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LargestAcked: 9,
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LowestAcked: 1,
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AckRanges: []wire.AckRange{ // packets 4 and 5 were lost
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{First: 6, Last: 9},
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{First: 1, Last: 3},
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},
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}
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err := handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 4, 5, 10, 12})
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})
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It("does not ack packets below the LowestAcked", func() {
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ack := wire.AckFrame{
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LargestAcked: 8,
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LowestAcked: 3,
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}
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err := handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 1, 2, 9, 10, 12})
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})
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It("handles an ACK with multiple missing packet ranges", func() {
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ack := wire.AckFrame{
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LargestAcked: 9,
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LowestAcked: 1,
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AckRanges: []wire.AckRange{ // packets 2, 4 and 5, and 8 were lost
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|
{First: 9, Last: 9},
|
|
{First: 6, Last: 7},
|
|
{First: 3, Last: 3},
|
|
{First: 1, Last: 1},
|
|
},
|
|
}
|
|
err := handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
expectInPacketHistory([]protocol.PacketNumber{0, 2, 4, 5, 8, 10, 12})
|
|
})
|
|
|
|
It("processes an ACK frame that would be sent after a late arrival of a packet", func() {
|
|
largestObserved := 6
|
|
ack1 := wire.AckFrame{
|
|
LargestAcked: protocol.PacketNumber(largestObserved),
|
|
LowestAcked: 1,
|
|
AckRanges: []wire.AckRange{
|
|
{First: 4, Last: protocol.PacketNumber(largestObserved)},
|
|
{First: 1, Last: 2},
|
|
},
|
|
}
|
|
err := handler.ReceivedAck(&ack1, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 5)))
|
|
expectInPacketHistory([]protocol.PacketNumber{0, 3, 7, 8, 9, 10, 12})
|
|
ack2 := wire.AckFrame{
|
|
LargestAcked: protocol.PacketNumber(largestObserved),
|
|
LowestAcked: 1,
|
|
}
|
|
err = handler.ReceivedAck(&ack2, 2, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 6)))
|
|
expectInPacketHistory([]protocol.PacketNumber{0, 7, 8, 9, 10, 12})
|
|
})
|
|
|
|
It("processes an ACK frame that would be sent after a late arrival of a packet and another packet", func() {
|
|
ack1 := wire.AckFrame{
|
|
LargestAcked: 6,
|
|
LowestAcked: 0,
|
|
AckRanges: []wire.AckRange{
|
|
{First: 4, Last: 6},
|
|
{First: 0, Last: 2},
|
|
},
|
|
}
|
|
err := handler.ReceivedAck(&ack1, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 6)))
|
|
expectInPacketHistory([]protocol.PacketNumber{3, 7, 8, 9, 10, 12})
|
|
ack2 := wire.AckFrame{
|
|
LargestAcked: 7,
|
|
LowestAcked: 1,
|
|
}
|
|
err = handler.ReceivedAck(&ack2, 2, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 8)))
|
|
expectInPacketHistory([]protocol.PacketNumber{8, 9, 10, 12})
|
|
})
|
|
|
|
It("processes an ACK that contains old ACK ranges", func() {
|
|
ack1 := wire.AckFrame{
|
|
LargestAcked: 6,
|
|
LowestAcked: 1,
|
|
}
|
|
err := handler.ReceivedAck(&ack1, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
expectInPacketHistory([]protocol.PacketNumber{0, 7, 8, 9, 10, 12})
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 6)))
|
|
ack2 := wire.AckFrame{
|
|
LargestAcked: 10,
|
|
LowestAcked: 1,
|
|
AckRanges: []wire.AckRange{
|
|
{First: 8, Last: 10},
|
|
{First: 3, Last: 3},
|
|
{First: 1, Last: 1},
|
|
},
|
|
}
|
|
err = handler.ReceivedAck(&ack2, 2, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(len(packets) - 6 - 3)))
|
|
expectInPacketHistory([]protocol.PacketNumber{0, 7, 12})
|
|
})
|
|
})
|
|
|
|
Context("calculating RTT", func() {
|
|
It("computes the RTT", func() {
|
|
now := time.Now()
|
|
// First, fake the sent times of the first, second and last packet
|
|
getPacketElement(1).Value.sendTime = now.Add(-10 * time.Minute)
|
|
getPacketElement(2).Value.sendTime = now.Add(-5 * time.Minute)
|
|
getPacketElement(6).Value.sendTime = now.Add(-1 * time.Minute)
|
|
// Now, check that the proper times are used when calculating the deltas
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1}, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 10*time.Minute, 1*time.Second))
|
|
err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 2}, 2, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 5*time.Minute, 1*time.Second))
|
|
err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 6}, 3, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 1*time.Minute, 1*time.Second))
|
|
})
|
|
|
|
It("uses the DelayTime in the ack frame", func() {
|
|
now := time.Now()
|
|
getPacketElement(1).Value.sendTime = now.Add(-10 * time.Minute)
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1, DelayTime: 5 * time.Minute}, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 5*time.Minute, 1*time.Second))
|
|
})
|
|
})
|
|
|
|
Context("determinining, which ACKs we have received an ACK for", func() {
|
|
BeforeEach(func() {
|
|
morePackets := []*Packet{
|
|
&Packet{PacketNumber: 13, Frames: []wire.Frame{&wire.AckFrame{LowestAcked: 80, LargestAcked: 100}, &streamFrame}, Length: 1},
|
|
&Packet{PacketNumber: 14, Frames: []wire.Frame{&wire.AckFrame{LowestAcked: 50, LargestAcked: 200}, &streamFrame}, Length: 1},
|
|
&Packet{PacketNumber: 15, Frames: []wire.Frame{&streamFrame}, Length: 1},
|
|
}
|
|
for _, packet := range morePackets {
|
|
err := handler.SentPacket(packet)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
}
|
|
})
|
|
|
|
It("determines which ACK we have received an ACK for", func() {
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 15, LowestAcked: 12}, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(201)))
|
|
})
|
|
|
|
It("doesn't do anything when the acked packet didn't contain an ACK", func() {
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 13, LowestAcked: 13}, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(101)))
|
|
err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 15, LowestAcked: 15}, 2, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(101)))
|
|
})
|
|
|
|
It("doesn't decrease the value", func() {
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 14, LowestAcked: 14}, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(201)))
|
|
err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 13, LowestAcked: 13}, 2, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(201)))
|
|
})
|
|
})
|
|
})
|
|
|
|
Context("Retransmission handling", func() {
|
|
var packets []*Packet
|
|
|
|
BeforeEach(func() {
|
|
packets = []*Packet{
|
|
{PacketNumber: 1, Frames: []wire.Frame{&streamFrame}, Length: 1, EncryptionLevel: protocol.EncryptionUnencrypted},
|
|
{PacketNumber: 2, Frames: []wire.Frame{&streamFrame}, Length: 1, EncryptionLevel: protocol.EncryptionUnencrypted},
|
|
{PacketNumber: 3, Frames: []wire.Frame{&streamFrame}, Length: 1, EncryptionLevel: protocol.EncryptionUnencrypted},
|
|
{PacketNumber: 4, Frames: []wire.Frame{&streamFrame}, Length: 1, EncryptionLevel: protocol.EncryptionSecure},
|
|
{PacketNumber: 5, Frames: []wire.Frame{&streamFrame}, Length: 1, EncryptionLevel: protocol.EncryptionSecure},
|
|
{PacketNumber: 6, Frames: []wire.Frame{&streamFrame}, Length: 1, EncryptionLevel: protocol.EncryptionForwardSecure},
|
|
{PacketNumber: 7, Frames: []wire.Frame{&streamFrame}, Length: 1, EncryptionLevel: protocol.EncryptionForwardSecure},
|
|
}
|
|
for _, packet := range packets {
|
|
handler.SentPacket(packet)
|
|
}
|
|
// Increase RTT, because the tests would be flaky otherwise
|
|
handler.rttStats.UpdateRTT(time.Minute, 0, time.Now())
|
|
// Ack a single packet so that we have non-RTO timings
|
|
handler.ReceivedAck(&wire.AckFrame{LargestAcked: 2, LowestAcked: 2}, 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(6)))
|
|
})
|
|
|
|
It("does not dequeue a packet if no ack has been received", func() {
|
|
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
|
|
})
|
|
|
|
It("dequeues a packet for retransmission", func() {
|
|
getPacketElement(1).Value.sendTime = time.Now().Add(-time.Hour)
|
|
handler.OnAlarm()
|
|
Expect(getPacketElement(1)).To(BeNil())
|
|
Expect(handler.retransmissionQueue).To(HaveLen(1))
|
|
Expect(handler.retransmissionQueue[0].PacketNumber).To(Equal(protocol.PacketNumber(1)))
|
|
packet := handler.DequeuePacketForRetransmission()
|
|
Expect(packet).ToNot(BeNil())
|
|
Expect(packet.PacketNumber).To(Equal(protocol.PacketNumber(1)))
|
|
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
|
|
})
|
|
|
|
It("deletes non forward-secure packets when the handshake completes", func() {
|
|
for i := protocol.PacketNumber(1); i <= 7; i++ {
|
|
if i == 2 { // packet 2 was already acked in BeforeEach
|
|
continue
|
|
}
|
|
handler.queuePacketForRetransmission(getPacketElement(i))
|
|
}
|
|
Expect(handler.retransmissionQueue).To(HaveLen(6))
|
|
handler.SetHandshakeComplete()
|
|
packet := handler.DequeuePacketForRetransmission()
|
|
Expect(packet).ToNot(BeNil())
|
|
Expect(packet.PacketNumber).To(Equal(protocol.PacketNumber(6)))
|
|
packet = handler.DequeuePacketForRetransmission()
|
|
Expect(packet).ToNot(BeNil())
|
|
Expect(packet.PacketNumber).To(Equal(protocol.PacketNumber(7)))
|
|
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
|
|
})
|
|
|
|
Context("STOP_WAITINGs", func() {
|
|
It("gets a STOP_WAITING frame", func() {
|
|
ack := wire.AckFrame{LargestAcked: 5, LowestAcked: 5}
|
|
err := handler.ReceivedAck(&ack, 2, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetStopWaitingFrame(false)).To(Equal(&wire.StopWaitingFrame{LeastUnacked: 6}))
|
|
})
|
|
|
|
It("gets a STOP_WAITING frame after queueing a retransmission", func() {
|
|
handler.queuePacketForRetransmission(getPacketElement(5))
|
|
Expect(handler.GetStopWaitingFrame(false)).To(Equal(&wire.StopWaitingFrame{LeastUnacked: 6}))
|
|
})
|
|
})
|
|
})
|
|
|
|
It("calculates bytes in flight", 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())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(1)))
|
|
err = handler.SentPacket(&packet2)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(1 + 2)))
|
|
err = handler.SentPacket(&packet3)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(1 + 2 + 3)))
|
|
|
|
// Increase RTT, because the tests would be flaky otherwise
|
|
handler.rttStats.UpdateRTT(time.Minute, 0, time.Now())
|
|
|
|
// ACK 1 and 3, NACK 2
|
|
ack := wire.AckFrame{
|
|
LargestAcked: 3,
|
|
LowestAcked: 1,
|
|
AckRanges: []wire.AckRange{
|
|
{First: 3, Last: 3},
|
|
{First: 1, Last: 1},
|
|
},
|
|
}
|
|
err = handler.ReceivedAck(&ack, 1, protocol.EncryptionUnencrypted, time.Now())
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(2)))
|
|
|
|
handler.packetHistory.Front().Value.sendTime = time.Now().Add(-time.Hour)
|
|
handler.OnAlarm()
|
|
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(0)))
|
|
})
|
|
|
|
Context("congestion", func() {
|
|
var (
|
|
cong *mocks.MockSendAlgorithm
|
|
)
|
|
|
|
BeforeEach(func() {
|
|
cong = mocks.NewMockSendAlgorithm(mockCtrl)
|
|
cong.EXPECT().RetransmissionDelay().AnyTimes()
|
|
handler.congestion = cong
|
|
})
|
|
|
|
It("should call OnSent", func() {
|
|
cong.EXPECT().OnPacketSent(
|
|
gomock.Any(),
|
|
protocol.ByteCount(42),
|
|
protocol.PacketNumber(1),
|
|
protocol.ByteCount(42),
|
|
true,
|
|
)
|
|
p := &Packet{
|
|
PacketNumber: 1,
|
|
Length: 42,
|
|
Frames: []wire.Frame{&wire.PingFrame{}},
|
|
}
|
|
err := handler.SentPacket(p)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
})
|
|
|
|
It("should call MaybeExitSlowStart and OnPacketAcked", func() {
|
|
cong.EXPECT().OnPacketSent(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Times(2)
|
|
cong.EXPECT().MaybeExitSlowStart()
|
|
cong.EXPECT().OnPacketAcked(
|
|
protocol.PacketNumber(1),
|
|
protocol.ByteCount(1),
|
|
protocol.ByteCount(1),
|
|
)
|
|
handler.SentPacket(retransmittablePacket(1))
|
|
handler.SentPacket(retransmittablePacket(2))
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1, LowestAcked: 1}, 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).NotTo(HaveOccurred())
|
|
})
|
|
|
|
It("should call MaybeExitSlowStart and OnPacketLost", func() {
|
|
cong.EXPECT().OnPacketSent(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Times(3)
|
|
cong.EXPECT().OnRetransmissionTimeout(true).Times(2)
|
|
cong.EXPECT().OnPacketLost(
|
|
protocol.PacketNumber(1),
|
|
protocol.ByteCount(1),
|
|
protocol.ByteCount(2),
|
|
)
|
|
cong.EXPECT().OnPacketLost(
|
|
protocol.PacketNumber(2),
|
|
protocol.ByteCount(1),
|
|
protocol.ByteCount(1),
|
|
)
|
|
handler.SentPacket(retransmittablePacket(1))
|
|
handler.SentPacket(retransmittablePacket(2))
|
|
handler.SentPacket(retransmittablePacket(3))
|
|
handler.OnAlarm() // RTO, meaning 2 lost packets
|
|
})
|
|
|
|
It("allows or denies sending based on congestion", func() {
|
|
Expect(handler.retransmissionQueue).To(BeEmpty())
|
|
handler.bytesInFlight = 100
|
|
cong.EXPECT().GetCongestionWindow().Return(protocol.MaxByteCount)
|
|
Expect(handler.SendingAllowed()).To(BeTrue())
|
|
cong.EXPECT().GetCongestionWindow().Return(protocol.ByteCount(0))
|
|
Expect(handler.SendingAllowed()).To(BeFalse())
|
|
})
|
|
|
|
It("allows or denies sending based on the number of tracked packets", func() {
|
|
cong.EXPECT().GetCongestionWindow().Return(protocol.MaxByteCount).AnyTimes()
|
|
Expect(handler.SendingAllowed()).To(BeTrue())
|
|
handler.retransmissionQueue = make([]*Packet, protocol.MaxTrackedSentPackets)
|
|
Expect(handler.SendingAllowed()).To(BeFalse())
|
|
})
|
|
|
|
It("allows sending if there are retransmisisons outstanding", func() {
|
|
handler.bytesInFlight = 100
|
|
cong.EXPECT().GetCongestionWindow().Return(protocol.ByteCount(0)).AnyTimes()
|
|
Expect(handler.SendingAllowed()).To(BeFalse())
|
|
handler.retransmissionQueue = []*Packet{nil}
|
|
Expect(handler.SendingAllowed()).To(BeTrue())
|
|
})
|
|
})
|
|
|
|
Context("calculating RTO", func() {
|
|
It("uses default RTO", func() {
|
|
Expect(handler.computeRTOTimeout()).To(Equal(defaultRTOTimeout))
|
|
})
|
|
|
|
It("uses RTO from rttStats", func() {
|
|
rtt := time.Second
|
|
expected := rtt + rtt/2*4
|
|
handler.rttStats.UpdateRTT(rtt, 0, time.Now())
|
|
Expect(handler.computeRTOTimeout()).To(Equal(expected))
|
|
})
|
|
|
|
It("limits RTO min", func() {
|
|
rtt := time.Millisecond
|
|
handler.rttStats.UpdateRTT(rtt, 0, time.Now())
|
|
Expect(handler.computeRTOTimeout()).To(Equal(minRTOTimeout))
|
|
})
|
|
|
|
It("limits RTO max", func() {
|
|
rtt := time.Hour
|
|
handler.rttStats.UpdateRTT(rtt, 0, time.Now())
|
|
Expect(handler.computeRTOTimeout()).To(Equal(maxRTOTimeout))
|
|
})
|
|
|
|
It("implements exponential backoff", func() {
|
|
handler.rtoCount = 0
|
|
Expect(handler.computeRTOTimeout()).To(Equal(defaultRTOTimeout))
|
|
handler.rtoCount = 1
|
|
Expect(handler.computeRTOTimeout()).To(Equal(2 * defaultRTOTimeout))
|
|
handler.rtoCount = 2
|
|
Expect(handler.computeRTOTimeout()).To(Equal(4 * defaultRTOTimeout))
|
|
})
|
|
})
|
|
|
|
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())
|
|
Expect(handler.lossTime.IsZero()).To(BeTrue())
|
|
|
|
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())
|
|
|
|
// RTT is around 1h now.
|
|
// The formula is (1+1/8) * RTT, so this should be around that number
|
|
Expect(handler.lossTime.Sub(time.Now())).To(BeNumerically("~", time.Hour*9/8, time.Minute))
|
|
Expect(handler.GetAlarmTimeout().Sub(time.Now())).To(BeNumerically("~", time.Hour*9/8, time.Minute))
|
|
|
|
handler.packetHistory.Front().Value.sendTime = time.Now().Add(-2 * time.Hour)
|
|
handler.OnAlarm()
|
|
Expect(handler.DequeuePacketForRetransmission()).NotTo(BeNil())
|
|
})
|
|
|
|
It("does not detect packets as lost without ACKs", func() {
|
|
err := handler.SentPacket(&Packet{PacketNumber: 1, Length: 1})
|
|
Expect(err).NotTo(HaveOccurred())
|
|
err = handler.SentPacket(retransmittablePacket(2))
|
|
Expect(err).NotTo(HaveOccurred())
|
|
err = handler.SentPacket(retransmittablePacket(3))
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.lossTime.IsZero()).To(BeTrue())
|
|
|
|
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(handler.GetAlarmTimeout().Sub(time.Now())).To(BeNumerically("~", handler.computeRTOTimeout(), time.Minute))
|
|
|
|
// This means RTO, so both packets should be lost
|
|
handler.OnAlarm()
|
|
Expect(handler.DequeuePacketForRetransmission()).ToNot(BeNil())
|
|
Expect(handler.DequeuePacketForRetransmission()).ToNot(BeNil())
|
|
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
|
|
})
|
|
})
|
|
|
|
Context("retransmission for handshake packets", func() {
|
|
BeforeEach(func() {
|
|
handler.handshakeComplete = false
|
|
})
|
|
|
|
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())
|
|
|
|
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()
|
|
Expect(handler.GetAlarmTimeout().Sub(time.Now())).To(BeNumerically("~", handshakeTimeout, time.Minute))
|
|
|
|
handler.OnAlarm()
|
|
p := handler.DequeuePacketForRetransmission()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(2)))
|
|
p = handler.DequeuePacketForRetransmission()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(4)))
|
|
Expect(handler.packetHistory.Len()).To(Equal(1))
|
|
Expect(handler.packetHistory.Front().Value.PacketNumber).To(Equal(protocol.PacketNumber(3)))
|
|
Expect(handler.handshakeCount).To(BeEquivalentTo(1))
|
|
// make sure the exponential backoff is used
|
|
Expect(handler.computeHandshakeTimeout()).To(BeNumerically("~", 2*handshakeTimeout, time.Minute))
|
|
})
|
|
})
|
|
|
|
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.rttStats.UpdateRTT(time.Hour, 0, time.Now())
|
|
Expect(handler.lossTime.IsZero()).To(BeTrue())
|
|
Expect(handler.GetAlarmTimeout().Sub(time.Now())).To(BeNumerically("~", handler.computeRTOTimeout(), time.Minute))
|
|
|
|
handler.OnAlarm()
|
|
p := handler.DequeuePacketForRetransmission()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(1)))
|
|
p = handler.DequeuePacketForRetransmission()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(2)))
|
|
|
|
Expect(handler.rtoCount).To(BeEquivalentTo(1))
|
|
})
|
|
})
|
|
})
|