QUIC J. Iyengar, Ed.
Internet-Draft Fastly
Intended status: Standards Track M. Thomson, Ed.
Expires: October 19, 2018 Mozilla
April 17, 2018
QUIC: A UDP-Based Multiplexed and Secure Transport
draft-ietf-quic-transport-11
Abstract
This document defines the core of the QUIC transport protocol. This
document describes connection establishment, packet format,
multiplexing and reliability. Accompanying documents describe the
cryptographic handshake and loss detection.
Note to Readers
Discussion of this draft takes place on the QUIC working group
mailing list (quic@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/search/?email_list=quic [1].
Working Group information can be found at https://github.com/quicwg
[2]; source code and issues list for this draft can be found at
https://github.com/quicwg/base-drafts/labels/-transport [3].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on October 19, 2018.
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Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 6
2.1. Notational Conventions . . . . . . . . . . . . . . . . . 6
3. Versions . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4. Packet Types and Formats . . . . . . . . . . . . . . . . . . 8
4.1. Long Header . . . . . . . . . . . . . . . . . . . . . . . 8
4.2. Short Header . . . . . . . . . . . . . . . . . . . . . . 10
4.3. Version Negotiation Packet . . . . . . . . . . . . . . . 12
4.4. Cryptographic Handshake Packets . . . . . . . . . . . . . 14
4.4.1. Initial Packet . . . . . . . . . . . . . . . . . . . 14
4.4.2. Retry Packet . . . . . . . . . . . . . . . . . . . . 15
4.4.3. Handshake Packet . . . . . . . . . . . . . . . . . . 16
4.5. Protected Packets . . . . . . . . . . . . . . . . . . . . 17
4.6. Coaslescing Packets . . . . . . . . . . . . . . . . . . . 17
4.7. Connection ID . . . . . . . . . . . . . . . . . . . . . . 18
4.8. Packet Numbers . . . . . . . . . . . . . . . . . . . . . 19
4.8.1. Initial Packet Number . . . . . . . . . . . . . . . . 20
5. Frames and Frame Types . . . . . . . . . . . . . . . . . . . 20
6. Life of a Connection . . . . . . . . . . . . . . . . . . . . 22
6.1. Matching Packets to Connections . . . . . . . . . . . . . 23
6.1.1. Client Packet Handling . . . . . . . . . . . . . . . 23
6.1.2. Server Packet Handling . . . . . . . . . . . . . . . 23
6.2. Version Negotiation . . . . . . . . . . . . . . . . . . . 24
6.2.1. Sending Version Negotiation Packets . . . . . . . . . 25
6.2.2. Handling Version Negotiation Packets . . . . . . . . 25
6.2.3. Using Reserved Versions . . . . . . . . . . . . . . . 26
6.3. Cryptographic and Transport Handshake . . . . . . . . . . 26
6.4. Transport Parameters . . . . . . . . . . . . . . . . . . 27
6.4.1. Transport Parameter Definitions . . . . . . . . . . . 29
6.4.2. Values of Transport Parameters for 0-RTT . . . . . . 30
6.4.3. New Transport Parameters . . . . . . . . . . . . . . 31
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6.4.4. Version Negotiation Validation . . . . . . . . . . . 31
6.5. Stateless Retries . . . . . . . . . . . . . . . . . . . . 33
6.6. Proof of Source Address Ownership . . . . . . . . . . . . 33
6.6.1. Client Address Validation Procedure . . . . . . . . . 34
6.6.2. Address Validation on Session Resumption . . . . . . 35
6.6.3. Address Validation Token Integrity . . . . . . . . . 35
6.7. Path Validation . . . . . . . . . . . . . . . . . . . . . 36
6.7.1. Initiation . . . . . . . . . . . . . . . . . . . . . 36
6.7.2. Response . . . . . . . . . . . . . . . . . . . . . . 37
6.7.3. Completion . . . . . . . . . . . . . . . . . . . . . 37
6.7.4. Abandonment . . . . . . . . . . . . . . . . . . . . . 38
6.8. Connection Migration . . . . . . . . . . . . . . . . . . 38
6.8.1. Probing a New Path . . . . . . . . . . . . . . . . . 38
6.8.2. Initiating Connection Migration . . . . . . . . . . . 39
6.8.3. Responding to Connection Migration . . . . . . . . . 39
6.8.4. Loss Detection and Congestion Control . . . . . . . . 41
6.8.5. Privacy Implications of Connection Migration . . . . 42
6.9. Connection Termination . . . . . . . . . . . . . . . . . 43
6.9.1. Closing and Draining Connection States . . . . . . . 44
6.9.2. Idle Timeout . . . . . . . . . . . . . . . . . . . . 45
6.9.3. Immediate Close . . . . . . . . . . . . . . . . . . . 45
6.9.4. Stateless Reset . . . . . . . . . . . . . . . . . . . 46
7. Frame Types and Formats . . . . . . . . . . . . . . . . . . . 49
7.1. Variable-Length Integer Encoding . . . . . . . . . . . . 49
7.2. PADDING Frame . . . . . . . . . . . . . . . . . . . . . . 50
7.3. RST_STREAM Frame . . . . . . . . . . . . . . . . . . . . 50
7.4. CONNECTION_CLOSE frame . . . . . . . . . . . . . . . . . 51
7.5. APPLICATION_CLOSE frame . . . . . . . . . . . . . . . . . 52
7.6. MAX_DATA Frame . . . . . . . . . . . . . . . . . . . . . 52
7.7. MAX_STREAM_DATA Frame . . . . . . . . . . . . . . . . . . 53
7.8. MAX_STREAM_ID Frame . . . . . . . . . . . . . . . . . . . 54
7.9. PING Frame . . . . . . . . . . . . . . . . . . . . . . . 54
7.10. BLOCKED Frame . . . . . . . . . . . . . . . . . . . . . . 55
7.11. STREAM_BLOCKED Frame . . . . . . . . . . . . . . . . . . 55
7.12. STREAM_ID_BLOCKED Frame . . . . . . . . . . . . . . . . . 56
7.13. NEW_CONNECTION_ID Frame . . . . . . . . . . . . . . . . . 56
7.14. STOP_SENDING Frame . . . . . . . . . . . . . . . . . . . 58
7.15. ACK Frame . . . . . . . . . . . . . . . . . . . . . . . . 58
7.15.1. ACK Block Section . . . . . . . . . . . . . . . . . 60
7.15.2. Sending ACK Frames . . . . . . . . . . . . . . . . . 61
7.15.3. ACK Frames and Packet Protection . . . . . . . . . . 62
7.16. PATH_CHALLENGE Frame . . . . . . . . . . . . . . . . . . 63
7.17. PATH_RESPONSE Frame . . . . . . . . . . . . . . . . . . . 63
7.18. STREAM Frames . . . . . . . . . . . . . . . . . . . . . . 64
8. Packetization and Reliability . . . . . . . . . . . . . . . . 65
8.1. Packet Processing and Acknowledgment . . . . . . . . . . 66
8.2. Retransmission of Information . . . . . . . . . . . . . . 66
8.3. Packet Size . . . . . . . . . . . . . . . . . . . . . . . 68
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8.4. Path Maximum Transmission Unit . . . . . . . . . . . . . 68
8.4.1. Special Considerations for PMTU Discovery . . . . . . 69
8.4.2. Special Considerations for Packetization Layer PMTU
Discovery . . . . . . . . . . . . . . . . . . . . . . 70
9. Streams: QUIC's Data Structuring Abstraction . . . . . . . . 70
9.1. Stream Identifiers . . . . . . . . . . . . . . . . . . . 71
9.2. Stream States . . . . . . . . . . . . . . . . . . . . . . 72
9.2.1. Send Stream States . . . . . . . . . . . . . . . . . 73
9.2.2. Receive Stream States . . . . . . . . . . . . . . . . 75
9.2.3. Permitted Frame Types . . . . . . . . . . . . . . . . 77
9.2.4. Bidirectional Stream States . . . . . . . . . . . . . 77
9.3. Solicited State Transitions . . . . . . . . . . . . . . . 78
9.4. Stream Concurrency . . . . . . . . . . . . . . . . . . . 79
9.5. Sending and Receiving Data . . . . . . . . . . . . . . . 80
9.6. Stream Prioritization . . . . . . . . . . . . . . . . . . 80
10. Flow Control . . . . . . . . . . . . . . . . . . . . . . . . 81
10.1. Edge Cases and Other Considerations . . . . . . . . . . 83
10.1.1. Response to a RST_STREAM . . . . . . . . . . . . . . 83
10.1.2. Data Limit Increments . . . . . . . . . . . . . . . 83
10.1.3. Handshake Exemption . . . . . . . . . . . . . . . . 84
10.2. Stream Limit Increment . . . . . . . . . . . . . . . . . 84
10.2.1. Blocking on Flow Control . . . . . . . . . . . . . . 84
10.3. Stream Final Offset . . . . . . . . . . . . . . . . . . 85
11. Error Handling . . . . . . . . . . . . . . . . . . . . . . . 85
11.1. Connection Errors . . . . . . . . . . . . . . . . . . . 86
11.2. Stream Errors . . . . . . . . . . . . . . . . . . . . . 87
11.3. Transport Error Codes . . . . . . . . . . . . . . . . . 87
11.4. Application Protocol Error Codes . . . . . . . . . . . . 88
12. Security and Privacy Considerations . . . . . . . . . . . . . 89
12.1. Spoofed ACK Attack . . . . . . . . . . . . . . . . . . . 89
12.2. Optimistic ACK Attack . . . . . . . . . . . . . . . . . 89
12.3. Slowloris Attacks . . . . . . . . . . . . . . . . . . . 90
12.4. Stream Fragmentation and Reassembly Attacks . . . . . . 90
12.5. Stream Commitment Attack . . . . . . . . . . . . . . . . 90
13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 91
13.1. QUIC Transport Parameter Registry . . . . . . . . . . . 91
13.2. QUIC Transport Error Codes Registry . . . . . . . . . . 92
14. References . . . . . . . . . . . . . . . . . . . . . . . . . 94
14.1. Normative References . . . . . . . . . . . . . . . . . . 94
14.2. Informative References . . . . . . . . . . . . . . . . . 95
14.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Appendix A. Contributors . . . . . . . . . . . . . . . . . . . . 96
Appendix B. Acknowledgments . . . . . . . . . . . . . . . . . . 97
Appendix C. Change Log . . . . . . . . . . . . . . . . . . . . . 97
C.1. Since draft-ietf-quic-transport-10 . . . . . . . . . . . 97
C.2. Since draft-ietf-quic-transport-09 . . . . . . . . . . . 98
C.3. Since draft-ietf-quic-transport-08 . . . . . . . . . . . 98
C.4. Since draft-ietf-quic-transport-07 . . . . . . . . . . . 99
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C.5. Since