1282 lines
44 KiB
Go
1282 lines
44 KiB
Go
package wire
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import (
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"bytes"
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"io"
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"time"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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var _ = Describe("ACK Frame (for gQUIC)", func() {
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Context("when parsing", func() {
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It("accepts a sample frame", func() {
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b := bytes.NewReader([]byte{0x40,
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0x1c, // largest acked
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0x0, 0x0, // delay time
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0x1c, // block length
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x1c)))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(1)))
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Expect(frame.HasMissingRanges()).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame that acks packet number 0", func() {
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b := bytes.NewReader([]byte{0x40,
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0x0, // largest acked
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0x0, 0x0, // delay time
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0x1, // block length
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0)))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(0)))
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Expect(frame.HasMissingRanges()).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame with 1 ACKed packet", func() {
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b := bytes.NewReader([]byte{0x40,
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0x10, // largest acked
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0x0, 0x0, // delay time
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0x1, // block length
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x10)))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(0x10)))
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Expect(frame.HasMissingRanges()).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame that acks multiple packets, starting with 0", func() {
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b := bytes.NewReader([]byte{0x40,
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0x10, // largest acked
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0x0, 0x0, // delay time
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0x11, // block length
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x10)))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(0)))
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Expect(frame.HasMissingRanges()).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame with multiple timestamps", func() {
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b := bytes.NewReader([]byte{0x40,
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0x10, // largest acked
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0x0, 0x0, // timestamp
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0x10, // block length
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0x4, // num timestamps
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0x1, 0x6b, 0x26, 0x4, 0x0, // 1st timestamp
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0x3, 0, 0, // 2nd timestamp
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0x2, 0, 0, // 3rd timestamp
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0x1, 0, 0, // 4th timestamp
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})
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_, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(b.Len()).To(BeZero())
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})
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It("errors when the ACK range is too large", func() {
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// LargestAcked: 0x1c
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// Length: 0x1d => LowestAcked would be -1
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b := bytes.NewReader([]byte{0x40,
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0x1c, // largest acked
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0x0, 0x0, // delay time
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0x1e, // block length
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0,
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})
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_, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).To(MatchError(errInvalidAckRanges))
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})
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It("errors when the first ACK range is empty", func() {
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b := bytes.NewReader([]byte{0x40,
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0x9, // largest acked
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0x0, 0x0, // delay time
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0x0, // block length
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0,
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})
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_, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).To(MatchError("invalid first ACK range"))
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})
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It("parses the delay time", func() {
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b := bytes.NewReader([]byte{0x40,
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0x3, // largest acked
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0x0, 0x8e, // delay time
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0x3, // block length
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(3)))
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Expect(frame.DelayTime).To(Equal(142 * time.Microsecond))
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})
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It("errors on EOFs", func() {
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data := []byte{0x60 ^ 0x4 ^ 0x1,
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0x9, 0x66, // largest acked
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0x23, 0x1, // delay time
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0x7, // num ACk blocks
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0x0, 0x7, // 1st block
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0xff, 0x0, 0x0, // 2nd block
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0xf5, 0x2, 0x8a, // 3rd block
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0xc8, 0x0, 0xe6, // 4th block
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0xff, 0x0, 0x0, // 5th block
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0xff, 0x0, 0x0, // 6th block
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0xff, 0x0, 0x0, // 7th block
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0x23, 0x0, 0x13, // 8th blocks
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0x2, // num timestamps
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0x1, 0x13, 0xae, 0xb, 0x0, // 1st timestamp
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0x0, 0x80, 0x5, // 2nd timestamp
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}
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_, err := ParseAckFrame(bytes.NewReader(data), versionBigEndian)
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Expect(err).NotTo(HaveOccurred())
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for i := range data {
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_, err := ParseAckFrame(bytes.NewReader(data[0:i]), versionBigEndian)
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Expect(err).To(MatchError(io.EOF))
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}
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})
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Context("largest acked length", func() {
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It("parses a frame with a 2 byte packet number", func() {
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b := bytes.NewReader([]byte{0x40 | 0x4,
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0x13, 0x37, // largest acked
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0x0, 0x0, // delay time
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0x9, // block length
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x1337)))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(0x1337 - 0x9 + 1)))
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Expect(frame.HasMissingRanges()).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame with a 4 byte packet number", func() {
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b := bytes.NewReader([]byte{0x40 | 0x8,
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0xde, 0xca, 0xfb, 0xad, // largest acked
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0x0, 0x0, // timesatmp
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0x5, // block length
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0xdecafbad)))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(0xdecafbad - 5 + 1)))
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Expect(frame.HasMissingRanges()).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame with a 6 byte packet number", func() {
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b := bytes.NewReader([]byte{0x4 | 0xc,
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, // largest acked
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0x0, 0x0, // delay time
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0x5, // block length
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0xdeadbeefcafe)))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(0xdeadbeefcafe - 5 + 1)))
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Expect(frame.HasMissingRanges()).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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})
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Context("ACK blocks", func() {
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It("parses a frame with two ACK blocks", func() {
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b := bytes.NewReader([]byte{0x60,
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0x18, // largest acked
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0x0, 0x0, // delay time
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0x1, // num ACK blocks
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0x3, // 1st block
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0x2, 0x10, // 2nd block
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x18)))
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Expect(frame.HasMissingRanges()).To(BeTrue())
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Expect(frame.AckRanges).To(HaveLen(2))
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Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 0x18 - 0x3 + 1, Last: 0x18}))
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Expect(frame.AckRanges[1]).To(Equal(AckRange{First: (0x18 - 0x3 + 1) - (0x2 + 1) - (0x10 - 1), Last: (0x18 - 0x3 + 1) - (0x2 + 1)}))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(4)))
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Expect(b.Len()).To(BeZero())
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})
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It("rejects a frame with invalid ACK ranges", func() {
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// like the test before, but increased the last ACK range, such that the First would be negative
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b := bytes.NewReader([]byte{0x60,
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0x18, // largest acked
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0x0, 0x0, // delay time
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0x1, // num ACK blocks
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0x3, // 1st block
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0x2, 0x15, // 2nd block
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0,
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})
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_, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).To(MatchError(errInvalidAckRanges))
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})
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It("rejects a frame that says it has ACK blocks in the typeByte, but doesn't have any", func() {
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b := bytes.NewReader([]byte{0x60 ^ 0x3,
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0x4, // largest acked
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0x0, 0x0, // delay time
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0, // num ACK blocks
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0,
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})
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_, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).To(MatchError(errInvalidAckRanges))
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})
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It("parses a frame with multiple single packets missing", func() {
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b := bytes.NewReader([]byte{0x60,
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0x27, // largest acked
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0x0, 0x0, // delay time
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0x6, // num ACK blocks
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0x9, // 1st block
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0x1, 0x1, // 2nd block
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0x1, 0x1, // 3rd block
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0x1, 0x1, // 4th block
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0x1, 0x1, // 5th block
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0x1, 0x1, // 6th block
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0x1, 0x13, // 7th block
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x27)))
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Expect(frame.HasMissingRanges()).To(BeTrue())
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Expect(frame.AckRanges).To(HaveLen(7))
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Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 31, Last: 0x27}))
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Expect(frame.AckRanges[1]).To(Equal(AckRange{First: 29, Last: 29}))
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Expect(frame.AckRanges[2]).To(Equal(AckRange{First: 27, Last: 27}))
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Expect(frame.AckRanges[3]).To(Equal(AckRange{First: 25, Last: 25}))
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Expect(frame.AckRanges[4]).To(Equal(AckRange{First: 23, Last: 23}))
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Expect(frame.AckRanges[5]).To(Equal(AckRange{First: 21, Last: 21}))
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Expect(frame.AckRanges[6]).To(Equal(AckRange{First: 1, Last: 19}))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(1)))
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame with multiple longer ACK blocks", func() {
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b := bytes.NewReader([]byte{0x60,
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0x52, // largest acked
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0xd1, 0x0, //delay time
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0x3, // num ACK blocks
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0x17, // 1st block
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0xa, 0x10, // 2nd block
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0x4, 0x8, // 3rd block
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0x2, 0x12, // 4th block
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x52)))
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Expect(frame.HasMissingRanges()).To(BeTrue())
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Expect(frame.AckRanges).To(HaveLen(4))
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Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 60, Last: 0x52}))
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Expect(frame.AckRanges[1]).To(Equal(AckRange{First: 34, Last: 49}))
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Expect(frame.AckRanges[2]).To(Equal(AckRange{First: 22, Last: 29}))
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Expect(frame.AckRanges[3]).To(Equal(AckRange{First: 2, Last: 19}))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(2)))
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Expect(b.Len()).To(BeZero())
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})
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Context("more than 256 lost packets in a row", func() {
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// 255 missing packets fit into a single ACK block
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It("parses a frame with a range of 255 missing packets", func() {
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b := bytes.NewReader([]byte{0x60 ^ 0x4,
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0x1, 0x15, // largest acked
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0x0, 0x0, // delay time
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0x1, // num ACK blocks
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0x3, // 1st block
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0xff, 0x13, // 2nd block
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x115)))
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Expect(frame.HasMissingRanges()).To(BeTrue())
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Expect(frame.AckRanges).To(HaveLen(2))
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Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 20 + 255, Last: 0x115}))
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Expect(frame.AckRanges[1]).To(Equal(AckRange{First: 1, Last: 19}))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(1)))
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Expect(b.Len()).To(BeZero())
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})
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// 256 missing packets fit into two ACK blocks
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It("parses a frame with a range of 256 missing packets", func() {
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b := bytes.NewReader([]byte{0x60 ^ 0x4,
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0x1, 0x14, // largest acked
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0x0, 0x0, // delay time
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0x2, // num ACK blocks
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0x1, // 1st block
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0xff, 0x0, // 2nd block
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0x1, 0x13, // 3rd block
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x114)))
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Expect(frame.HasMissingRanges()).To(BeTrue())
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Expect(frame.AckRanges).To(HaveLen(2))
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Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 20 + 256, Last: 0x114}))
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Expect(frame.AckRanges[1]).To(Equal(AckRange{First: 1, Last: 19}))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(1)))
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame with an incomplete range at the end", func() {
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// this is a modified ACK frame that has 5 instead of originally 6 written ranges
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// each gap is 300 packets and thus takes 2 ranges
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// the last range is incomplete, and should be completely ignored
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b := bytes.NewReader([]byte{0x60 ^ 0x4,
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0x3, 0x9b, // largest acked
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0x0, 0x0, // delay time
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0x5, // num ACK blocks, instead of 0x6
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0x1, // 1st block
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0xff, 0x0, // 2nd block
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0x2d, 0x1, // 3rd block
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0xff, 0x0, // 4th block
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0x2d, 0x1, // 5th block
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0xff, 0x0, /*0x2d, 0x14,*/ // 6th block
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x39b)))
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Expect(frame.HasMissingRanges()).To(BeTrue())
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Expect(frame.AckRanges).To(HaveLen(3))
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Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 20 + 3*301, Last: 20 + 3*301}))
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Expect(frame.AckRanges[1]).To(Equal(AckRange{First: 20 + 2*301, Last: 20 + 2*301}))
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Expect(frame.AckRanges[2]).To(Equal(AckRange{First: 20 + 1*301, Last: 20 + 1*301}))
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Expect(b.Len()).To(BeZero())
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})
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It("parses a frame with one long range, spanning 2 blocks, of missing packets", func() {
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// 280 missing packets
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b := bytes.NewReader([]byte{0x60 ^ 0x4,
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0x1, 0x44, // largest acked
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0x0, 0x0, // delay time
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0x2, // num ACK blocks
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0x19, // 1st block
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0xff, 0x0, // 2nd block
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0x19, 0x13, // 3rd block
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x144)))
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Expect(frame.HasMissingRanges()).To(BeTrue())
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Expect(frame.AckRanges).To(HaveLen(2))
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Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 300, Last: 0x144}))
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Expect(frame.AckRanges[1]).To(Equal(AckRange{First: 1, Last: 19}))
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Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(1)))
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Expect(b.Len()).To(BeZero())
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})
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|
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It("parses a frame with one long range, spanning multiple blocks, of missing packets", func() {
|
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// 2345 missing packets
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b := bytes.NewReader([]byte{0x60 ^ 0x4,
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0x9, 0x5b, // largest acked
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0x0, 0x0, // delay time
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0xa, // num ACK blocks
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0x1f, // 1st block
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0xff, 0x0, // 2nd block
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0xff, 0x0, // 3rd block
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0xff, 0x0, // 4th block
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0xff, 0x0, // 5th block
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0xff, 0x0, // 6th block
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0xff, 0x0, // 7th block
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0xff, 0x0, // 8th block
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0xff, 0x0, // 9th block
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0xff, 0x0, // 10th block
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0x32, 0x13, // 11th block
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0,
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})
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frame, err := ParseAckFrame(b, versionBigEndian)
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Expect(err).ToNot(HaveOccurred())
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Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x95b)))
|
|
Expect(frame.HasMissingRanges()).To(BeTrue())
|
|
Expect(frame.AckRanges).To(HaveLen(2))
|
|
Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 2365, Last: 0x95b}))
|
|
Expect(frame.AckRanges[1]).To(Equal(AckRange{First: 1, Last: 19}))
|
|
Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(1)))
|
|
Expect(b.Len()).To(BeZero())
|
|
})
|
|
|
|
It("parses a frame with multiple 2 byte long ranges of missing packets", func() {
|
|
b := bytes.NewReader([]byte{0x60 ^ 0x4 ^ 0x1,
|
|
0x9, 0x66, // largest acked
|
|
0x0, 0x0, // delay time
|
|
0x7, // num ACK blocks
|
|
0x0, 0x7, // 1st block
|
|
0xff, 0x0, 0x0, // 2nd block
|
|
0xf5, 0x2, 0x8a, // 3rd block
|
|
0xc8, 0x0, 0xe6, // 4th block
|
|
0xff, 0x0, 0x0, // 5th block
|
|
0xff, 0x0, 0x0, // 6th block
|
|
0xff, 0x0, 0x0, // 7th block
|
|
0x23, 0x0, 0x13, // 8th block
|
|
0,
|
|
})
|
|
frame, err := ParseAckFrame(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0x966)))
|
|
Expect(frame.HasMissingRanges()).To(BeTrue())
|
|
Expect(frame.AckRanges).To(HaveLen(4))
|
|
Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 2400, Last: 0x966}))
|
|
Expect(frame.AckRanges[1]).To(Equal(AckRange{First: 1250, Last: 1899}))
|
|
Expect(frame.AckRanges[2]).To(Equal(AckRange{First: 820, Last: 1049}))
|
|
Expect(frame.AckRanges[3]).To(Equal(AckRange{First: 1, Last: 19}))
|
|
Expect(frame.LowestAcked).To(Equal(protocol.PacketNumber(1)))
|
|
Expect(b.Len()).To(BeZero())
|
|
})
|
|
|
|
It("parses a frame with with a 4 byte ack block length", func() {
|
|
b := bytes.NewReader([]byte{0x60 ^ 0xc ^ 0x2,
|
|
0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, // largest acked
|
|
0x0, 0x0, // delay time
|
|
0x1, // num ACK blocks
|
|
0, 0, 0x13, 0x37, // 1st block
|
|
0x20, 0x12, 0x34, 0x56, 0x78, // 2nd block
|
|
0,
|
|
})
|
|
frame, err := ParseAckFrame(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0xdeadbeefcafe)))
|
|
Expect(frame.HasMissingRanges()).To(BeTrue())
|
|
Expect(frame.AckRanges).To(HaveLen(2))
|
|
Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 0xdeadbeefcafe - 0x1337 + 1, Last: 0xdeadbeefcafe}))
|
|
Expect(frame.AckRanges[1]).To(Equal(AckRange{First: (0xdeadbeefcafe - 0x1337 + 1) - (0x20 + 1) - (0x12345678 - 1), Last: (0xdeadbeefcafe - 0x1337 + 1) - (0x20 + 1)}))
|
|
})
|
|
|
|
It("parses a frame with with a 6 byte ack block length", func() {
|
|
b := bytes.NewReader([]byte{0x60 ^ 0xc ^ 0x3,
|
|
0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, // largest acked
|
|
0x0, 0x0, // delay time
|
|
0x1, // num ACk blocks
|
|
0, 0, 0, 0, 0x13, 0x37, // 1st block
|
|
0x20, 0x0, 0xab, 0x12, 0x34, 0x56, 0x78, // 2nd block
|
|
0,
|
|
})
|
|
frame, err := ParseAckFrame(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(protocol.PacketNumber(0xdeadbeefcafe)))
|
|
Expect(frame.HasMissingRanges()).To(BeTrue())
|
|
Expect(frame.AckRanges).To(HaveLen(2))
|
|
Expect(frame.AckRanges[0]).To(Equal(AckRange{First: 0xdeadbeefcafe - 0x1337 + 1, Last: 0xdeadbeefcafe}))
|
|
Expect(frame.AckRanges[1]).To(Equal(AckRange{First: (0xdeadbeefcafe - 0x1337 + 1) - (0x20 + 1) - (0xab12345678 - 1), Last: (0xdeadbeefcafe - 0x1337 + 1) - (0x20 + 1)}))
|
|
})
|
|
})
|
|
})
|
|
})
|
|
|
|
Context("when writing", func() {
|
|
var b *bytes.Buffer
|
|
|
|
BeforeEach(func() {
|
|
b = &bytes.Buffer{}
|
|
})
|
|
|
|
Context("self-consistency", func() {
|
|
It("writes a simple ACK frame", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 1,
|
|
LowestAcked: 1,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.HasMissingRanges()).To(BeFalse())
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes an ACK that also acks packet 0", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 1,
|
|
LowestAcked: 0,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.HasMissingRanges()).To(BeFalse())
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes the correct block length in a simple ACK frame", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 20,
|
|
LowestAcked: 10,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.HasMissingRanges()).To(BeFalse())
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a simple ACK frame with a high packet number", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 0xdeadbeefcafe,
|
|
LowestAcked: 0xdeadbeefcafe,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.HasMissingRanges()).To(BeFalse())
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes an ACK frame with one packet missing", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 40,
|
|
LowestAcked: 0,
|
|
AckRanges: []AckRange{
|
|
{First: 25, Last: 40},
|
|
{First: 0, Last: 23},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes an ACK frame with multiple missing packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 25,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 22, Last: 25},
|
|
{First: 15, Last: 18},
|
|
{First: 13, Last: 13},
|
|
{First: 1, Last: 10},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("rejects a frame with incorrect LargestObserved value", func() {
|
|
frame := &AckFrame{
|
|
LargestAcked: 26,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 12, Last: 25},
|
|
{First: 1, Last: 10},
|
|
},
|
|
}
|
|
err := frame.Write(b, versionBigEndian)
|
|
Expect(err).To(MatchError(errInconsistentAckLargestAcked))
|
|
})
|
|
|
|
It("rejects a frame with incorrect LargestObserved value", func() {
|
|
frame := &AckFrame{
|
|
LargestAcked: 25,
|
|
LowestAcked: 2,
|
|
AckRanges: []AckRange{
|
|
{First: 12, Last: 25},
|
|
{First: 1, Last: 10},
|
|
},
|
|
}
|
|
err := frame.Write(b, versionBigEndian)
|
|
Expect(err).To(MatchError(errInconsistentAckLowestAcked))
|
|
})
|
|
|
|
Context("longer gaps between ACK blocks", func() {
|
|
It("only writes one block for 254 lost packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 300,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 20 + 254, Last: 300},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
Expect(frameOrig.numWritableNackRanges()).To(Equal(uint64(2)))
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
})
|
|
|
|
It("only writes one block for 255 lost packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 300,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 20 + 255, Last: 300},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
Expect(frameOrig.numWritableNackRanges()).To(Equal(uint64(2)))
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
})
|
|
|
|
It("writes two blocks for 256 lost packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 300,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 20 + 256, Last: 300},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
Expect(frameOrig.numWritableNackRanges()).To(Equal(uint64(3)))
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
})
|
|
|
|
It("writes two blocks for 510 lost packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 600,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 20 + 510, Last: 600},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
Expect(frameOrig.numWritableNackRanges()).To(Equal(uint64(3)))
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
})
|
|
|
|
It("writes three blocks for 511 lost packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 600,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 20 + 511, Last: 600},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
Expect(frameOrig.numWritableNackRanges()).To(Equal(uint64(4)))
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
})
|
|
|
|
It("writes three blocks for 512 lost packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 600,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 20 + 512, Last: 600},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
Expect(frameOrig.numWritableNackRanges()).To(Equal(uint64(4)))
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
})
|
|
|
|
It("writes multiple blocks for a lot of lost packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 3000,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 2900, Last: 3000},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
})
|
|
|
|
It("writes multiple longer blocks for 256 lost packets", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 3600,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 2900, Last: 3600},
|
|
{First: 1000, Last: 2500},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
})
|
|
})
|
|
|
|
Context("largest acked length", func() {
|
|
It("writes a 1 largest acked", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 200,
|
|
LowestAcked: 1,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x0)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 2 byte largest acked", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 0x100,
|
|
LowestAcked: 1,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x1)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 4 byte largest acked", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 0x10000,
|
|
LowestAcked: 1,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x2)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 6 byte largest acked", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 0x100000000,
|
|
LowestAcked: 1,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x3)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
})
|
|
|
|
Context("ack block length", func() {
|
|
It("writes a 1 byte ack block length, if all ACK blocks are short", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 5001,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 5000, Last: 5001},
|
|
{First: 250, Last: 300},
|
|
{First: 1, Last: 200},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x0)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 2 byte ack block length, for a frame with one ACK block", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 10000,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 9990, Last: 10000},
|
|
{First: 1, Last: 9988},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x1)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 2 byte ack block length, for a frame with multiple ACK blocks", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 10000,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 9990, Last: 10000},
|
|
{First: 1, Last: 256},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x1)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 4 byte ack block length, for a frame with single ACK blocks", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 0xdeadbeef,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 9990, Last: 0xdeadbeef},
|
|
{First: 1, Last: 9988},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x2)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 4 byte ack block length, for a frame with multiple ACK blocks", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 0xdeadbeef,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 9990, Last: 0xdeadbeef},
|
|
{First: 1, Last: 256},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x2)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 6 byte ack block length, for a frame with a single ACK blocks", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 0xdeadbeefcafe,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 9990, Last: 0xdeadbeefcafe},
|
|
{First: 1, Last: 9988},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x3)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
|
|
It("writes a 6 byte ack block length, for a frame with multiple ACK blocks", func() {
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: 0xdeadbeefcafe,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 9990, Last: 0xdeadbeefcafe},
|
|
{First: 1, Last: 256},
|
|
},
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(b.Bytes()[0] & 0x3).To(Equal(byte(0x3)))
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(frameOrig.LowestAcked))
|
|
Expect(frame.AckRanges).To(Equal(frameOrig.AckRanges))
|
|
Expect(r.Len()).To(BeZero())
|
|
})
|
|
})
|
|
|
|
Context("too many ACK blocks", func() {
|
|
It("skips the lowest ACK ranges, if there are more than 255 AckRanges", func() {
|
|
ackRanges := make([]AckRange, 300)
|
|
for i := 1; i <= 300; i++ {
|
|
ackRanges[300-i] = AckRange{First: protocol.PacketNumber(3 * i), Last: protocol.PacketNumber(3*i + 1)}
|
|
}
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: ackRanges[0].Last,
|
|
LowestAcked: ackRanges[len(ackRanges)-1].First,
|
|
AckRanges: ackRanges,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(ackRanges[254].First))
|
|
Expect(frame.AckRanges).To(HaveLen(0xFF))
|
|
Expect(frame.validateAckRanges()).To(BeTrue())
|
|
})
|
|
|
|
It("skips the lowest ACK ranges, if the gaps are large", func() {
|
|
ackRanges := make([]AckRange, 100)
|
|
// every AckRange will take 4 written ACK ranges
|
|
for i := 1; i <= 100; i++ {
|
|
ackRanges[100-i] = AckRange{First: protocol.PacketNumber(1000 * i), Last: protocol.PacketNumber(1000*i + 1)}
|
|
}
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: ackRanges[0].Last,
|
|
LowestAcked: ackRanges[len(ackRanges)-1].First,
|
|
AckRanges: ackRanges,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.LowestAcked).To(Equal(ackRanges[255/4].First))
|
|
Expect(frame.validateAckRanges()).To(BeTrue())
|
|
})
|
|
|
|
It("works with huge gaps", func() {
|
|
ackRanges := []AckRange{
|
|
{First: 2 * 255 * 200, Last: 2*255*200 + 1},
|
|
{First: 1 * 255 * 200, Last: 1*255*200 + 1},
|
|
{First: 1, Last: 2},
|
|
}
|
|
frameOrig := &AckFrame{
|
|
LargestAcked: ackRanges[0].Last,
|
|
LowestAcked: ackRanges[len(ackRanges)-1].First,
|
|
AckRanges: ackRanges,
|
|
}
|
|
err := frameOrig.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
r := bytes.NewReader(b.Bytes())
|
|
frame, err := ParseAckFrame(r, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(frame.LargestAcked).To(Equal(frameOrig.LargestAcked))
|
|
Expect(frame.AckRanges).To(HaveLen(2))
|
|
Expect(frame.LowestAcked).To(Equal(ackRanges[1].First))
|
|
Expect(frame.validateAckRanges()).To(BeTrue())
|
|
})
|
|
})
|
|
})
|
|
|
|
Context("min length", func() {
|
|
It("has proper min length", func() {
|
|
f := &AckFrame{
|
|
LargestAcked: 1,
|
|
}
|
|
err := f.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(f.MinLength(versionBigEndian)).To(Equal(protocol.ByteCount(b.Len())))
|
|
})
|
|
|
|
It("has proper min length with a large LargestObserved", func() {
|
|
f := &AckFrame{
|
|
LargestAcked: 0xDEADBEEFCAFE,
|
|
}
|
|
err := f.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(f.MinLength(versionBigEndian)).To(Equal(protocol.ByteCount(b.Len())))
|
|
})
|
|
|
|
It("has the proper min length for an ACK with missing packets", func() {
|
|
f := &AckFrame{
|
|
LargestAcked: 2000,
|
|
LowestAcked: 10,
|
|
AckRanges: []AckRange{
|
|
{First: 1000, Last: 2000},
|
|
{First: 50, Last: 900},
|
|
{First: 10, Last: 23},
|
|
},
|
|
}
|
|
err := f.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(f.MinLength(versionBigEndian)).To(Equal(protocol.ByteCount(b.Len())))
|
|
})
|
|
|
|
It("has the proper min length for an ACK with long gaps of missing packets", func() {
|
|
f := &AckFrame{
|
|
LargestAcked: 2000,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 1500, Last: 2000},
|
|
{First: 290, Last: 295},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
err := f.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(f.MinLength(versionBigEndian)).To(Equal(protocol.ByteCount(b.Len())))
|
|
})
|
|
|
|
It("has the proper min length for an ACK with a long ACK range", func() {
|
|
largestAcked := protocol.PacketNumber(2 + 0xFFFFFF)
|
|
f := &AckFrame{
|
|
LargestAcked: largestAcked,
|
|
LowestAcked: 1,
|
|
AckRanges: []AckRange{
|
|
{First: 1500, Last: largestAcked},
|
|
{First: 290, Last: 295},
|
|
{First: 1, Last: 19},
|
|
},
|
|
}
|
|
err := f.Write(b, versionBigEndian)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(f.MinLength(versionBigEndian)).To(Equal(protocol.ByteCount(b.Len())))
|
|
})
|
|
})
|
|
})
|
|
|
|
Context("ACK range validator", func() {
|
|
It("accepts an ACK without NACK Ranges", func() {
|
|
ack := AckFrame{LargestAcked: 7}
|
|
Expect(ack.validateAckRanges()).To(BeTrue())
|
|
})
|
|
|
|
It("rejects ACK ranges with a single range", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 10,
|
|
AckRanges: []AckRange{{First: 1, Last: 10}},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeFalse())
|
|
})
|
|
|
|
It("rejects ACK ranges with Last of the first range unequal to LargestObserved", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 10,
|
|
AckRanges: []AckRange{
|
|
{First: 8, Last: 9},
|
|
{First: 2, Last: 3},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeFalse())
|
|
})
|
|
|
|
It("rejects ACK ranges with First greater than Last", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 10,
|
|
AckRanges: []AckRange{
|
|
{First: 8, Last: 10},
|
|
{First: 4, Last: 3},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeFalse())
|
|
})
|
|
|
|
It("rejects ACK ranges with First greater than LargestObserved", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 5,
|
|
AckRanges: []AckRange{
|
|
{First: 4, Last: 10},
|
|
{First: 1, Last: 2},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeFalse())
|
|
})
|
|
|
|
It("rejects ACK ranges in the wrong order", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 7,
|
|
AckRanges: []AckRange{
|
|
{First: 2, Last: 2},
|
|
{First: 6, Last: 7},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeFalse())
|
|
})
|
|
|
|
It("rejects with overlapping ACK ranges", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 7,
|
|
AckRanges: []AckRange{
|
|
{First: 5, Last: 7},
|
|
{First: 2, Last: 5},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeFalse())
|
|
})
|
|
|
|
It("rejects ACK ranges that are part of a larger ACK range", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 7,
|
|
AckRanges: []AckRange{
|
|
{First: 4, Last: 7},
|
|
{First: 5, Last: 6},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeFalse())
|
|
})
|
|
|
|
It("rejects with directly adjacent ACK ranges", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 7,
|
|
AckRanges: []AckRange{
|
|
{First: 5, Last: 7},
|
|
{First: 2, Last: 4},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeFalse())
|
|
})
|
|
|
|
It("accepts an ACK with one lost packet", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 10,
|
|
AckRanges: []AckRange{
|
|
{First: 5, Last: 10},
|
|
{First: 1, Last: 3},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeTrue())
|
|
})
|
|
|
|
It("accepts an ACK with multiple lost packets", func() {
|
|
ack := AckFrame{
|
|
LargestAcked: 20,
|
|
AckRanges: []AckRange{
|
|
{First: 15, Last: 20},
|
|
{First: 10, Last: 12},
|
|
{First: 1, Last: 3},
|
|
},
|
|
}
|
|
Expect(ack.validateAckRanges()).To(BeTrue())
|
|
})
|
|
})
|
|
|
|
Context("check if ACK frame acks a certain packet", func() {
|
|
It("works with an ACK without any ranges", func() {
|
|
f := AckFrame{
|
|
LowestAcked: 5,
|
|
LargestAcked: 10,
|
|
}
|
|
Expect(f.AcksPacket(1)).To(BeFalse())
|
|
Expect(f.AcksPacket(4)).To(BeFalse())
|
|
Expect(f.AcksPacket(5)).To(BeTrue())
|
|
Expect(f.AcksPacket(8)).To(BeTrue())
|
|
Expect(f.AcksPacket(10)).To(BeTrue())
|
|
Expect(f.AcksPacket(11)).To(BeFalse())
|
|
Expect(f.AcksPacket(20)).To(BeFalse())
|
|
})
|
|
|
|
It("works with an ACK with multiple ACK ranges", func() {
|
|
f := AckFrame{
|
|
LowestAcked: 5,
|
|
LargestAcked: 20,
|
|
AckRanges: []AckRange{
|
|
{First: 15, Last: 20},
|
|
{First: 5, Last: 8},
|
|
},
|
|
}
|
|
Expect(f.AcksPacket(4)).To(BeFalse())
|
|
Expect(f.AcksPacket(5)).To(BeTrue())
|
|
Expect(f.AcksPacket(7)).To(BeTrue())
|
|
Expect(f.AcksPacket(8)).To(BeTrue())
|
|
Expect(f.AcksPacket(9)).To(BeFalse())
|
|
Expect(f.AcksPacket(14)).To(BeFalse())
|
|
Expect(f.AcksPacket(15)).To(BeTrue())
|
|
Expect(f.AcksPacket(18)).To(BeTrue())
|
|
Expect(f.AcksPacket(20)).To(BeTrue())
|
|
Expect(f.AcksPacket(21)).To(BeFalse())
|
|
})
|
|
})
|
|
})
|