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

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0-RTT packets can't contain ACK frames. This was correctly reflected in the
code path for packing a 0-RTT packet, but we would ignore the ACK-only flag
when packing the coalesced packet, leading to a full-size 0-RTT packet being
sent out when we're only allowed to send an ACK-only packet.
This commit is contained in:
Marten Seemann 2023-05-28 17:35:32 +03:00 • committed by GitHub
parent f5516715eb
commit 762d5c2c9c
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2 changed files with 7 additions and 1 deletions
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6
packet_packer_test.go
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@ -316,6 +316,12 @@ var _ = Describe("Packet packer", func() {
Expect(p.longHdrPackets[0].EncryptionLevel()).To(Equal(protocol.Encryption0RTT))
Expect(p.longHdrPackets[0].frames).To(Equal([]*ackhandler.Frame{cf}))
})
It("doesn't add an ACK-only 0-RTT packet", func() { // ACK frames cannot be sent in 0-RTT packets
p, err := packer.PackCoalescedPacket(true, protocol.Version1)
Expect(err).ToNot(HaveOccurred())
Expect(p).To(BeNil())
})
})
Context("packing CONNECTION_CLOSE", func() {