Internet DRAFT - draft-piraux-quic-additional-addresses
draft-piraux-quic-additional-addresses
QUIC M. Piraux
Internet-Draft O. Bonaventure
Intended status: Experimental UCLouvain & WEL RI
Expires: 5 September 2024 4 March 2024
Additional addresses for QUIC
draft-piraux-quic-additional-addresses-02
Abstract
This document specifies a QUIC frame enabling a QUIC server to
advertise additional addresses that can be used for a QUIC
connection.
About This Document
This note is to be removed before publishing as an RFC.
The latest revision of this draft can be found at
https://mpiraux.github.io/draft-piraux-quic-additional-addresses/
draft-piraux-quic-additional-addresses.html. Status information for
this document may be found at https://datatracker.ietf.org/doc/draft-
piraux-quic-additional-addresses/.
Discussion of this document takes place on the QUIC Working Group
mailing list (mailto:quic@ietf.org), which is archived at
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https://www.ietf.org/mailman/listinfo/quic/.
Source for this draft and an issue tracker can be found at
https://github.com/mpiraux/draft-piraux-quic-additional-addresses.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on 5 September 2024.
Copyright Notice
Copyright (c) 2024 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
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Please review these documents carefully, as they describe your rights
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 3
3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Example of use . . . . . . . . . . . . . . . . . . . . . 3
4. Additional Addresses Transport Parameter . . . . . . . . . . 4
5. ADDITIONAL_ADDRESSES Frames . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
8.1. Normative References . . . . . . . . . . . . . . . . . . 7
8.2. Informative References . . . . . . . . . . . . . . . . . 8
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
The QUIC protocol specifies several techniques for network path
migration. The client can migrate from one of its local addresses to
another at any time after the handshake using connection migration.
The server can transfer a connection to one of its other addresses
shortly after the handshake by using the preferred_address transport
parameter. However, it cannot advertise additional addresses that a
client may use.
This limitation impacts several scenarios. For instance, a
multihomed server that has access to several subnets cannot advertise
all its addresses. In entreprise deployments where provider-assigned
IPv6 Addresses are used to solve the multihoming problem [RFC8678],
announcing several server addresses enables applications using QUIC
to recover from provider failures. Also, a dual-stack server cannot
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advertise its other address so that a client losing the address
family used to establish the connection can migrate to the other
address family.
This document proposes a QUIC frame and a QUIC transport parameter
enabling a QUIC server to advertise additional addresses that can be
used for a QUIC connection.
2. Conventions and Definitions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
3. Overview
The ADDITIONAL_ADDRESSES frame proposed in this document enables a
QUIC server to securely advertise additional addresses. The
Additional Addresses transport parameter enables a QUIC client to
indicate support for this frame.
These addresses can be used by the client to migrate to a new server
address at any time after the handshake. When [MULTIPATH-QUIC] is
used over a QUIC connection, the client can use these addresses to
establish additional network paths.
When sending packets to a new server address, the client validates
the address using Path Validation as described in Section 8.2 of
[QUIC-TRANSPORT]. When Preferred Adress and Additional Addresses are
used together, the client SHOULD NOT migrate to an additional address
before acting on the preferred address indicated by the server.
3.1. Example of use
Figure 1 illustrates an example of use for Additional Addresses in a
QUIC deployment featuring a load balancer and a multihomed server
making use of the Preferred Address mechanism.
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First, the client sends its Initial packet to the load balancer,
which forwards it to the first server IP. The client indicates
support for this extension by using the dedicated transport
parameter. The server answers to the QUIC connection opening and
indicates its first IP as a preferred address and its second one as
an additional address using the dedicated frame. When the handshake
completes, the client validates the preferred address and migrates to
it. Later during the connection, the client can validate the path
towards the second server IP and can migrate to it.
Client Load-balancer @ IP lb Server @ IP a Server @ IP b
| | | |
| Initial[0]: CRYPTO(CH(Add.Addr)) | |
|--------------------->|--------------------->| |
....
| Handshake[0]: CRYPTO(EE(Pr.Addr=a),..) | |
|<---------------------|<---------------------| |
| 1-RTT[0]: ADDITIONAL_ADDRESSES([b]) | |
|<---------------------|<---------------------| |
....
| Handshake[0]: CRYPTO(Fin) | |
|--------------------->|--------------------->| |
| /* Migration to Preferred Address a */ | |
|-------------------------------------------->| |
....
| | |
| | . |
| 1-RTT[X]: PATH_CHALLENGE /* Migration to Add. Address b */ |
|------------------------------------------------------------>|
| 1-RTT[Y]: PATH_RESPONSE |
|<------------------------------------------------------------|
| |
Figure 1: A server reached through a load-balancer uses Add.
Addresses
4. Additional Addresses Transport Parameter
The following transport parameter is defined:
additional_addresses (TBD - experiments use 0x925addaXX): Indicates
the support of the ADDITIONAL_ADDRESSES frame as defined in the
-XX draft version of this document. This transport parameter has
a zero-length value. It MUST NOT be sent by a server.
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5. ADDITIONAL_ADDRESSES Frames
The server uses an ADDITIONAL_ADDRESSES frame (type=TBD - experiments
use 0x925addaXX) to advertise the additional addresses that a client
can use to reach it. This frame MUST NOT be sent by a client and can
only appear in 1-RTT packets.
Additional Addresses {
Type (i) = TBD,
Sequence Number (i),
Additional Addresses Count (i),
Additional Address (..) ...,
}
Figure 2: ADDITIONAL_ADDRESSES Frame Format
Sequence Number: A variable-length integer indicating the sequence
of the frame. The number is monotonically increasing within a
QUIC connection and is chosen by the sender. It helps the
receiver to order ADDITIONAL_ADDRESSES frames by recency. A
receiver SHOULD ignore frames with a Sequence Number lower or
equal to the highest Sequence Number received.
Additional Addresses Count: A variable-length integer indicating the
number of additional addresses in the frame.
Additional Address {
Address Version (8),
IP Address (..),
IP Port (16),
}
Figure 3: Additional Address Format
Address Version: An 8-bit value identifying the Internet address
version of this address. The value 4 indicates IPv4 while 6
indicates IPv6.
IP Address: The address value. Its size depends on its version.
IPv4 addresses are 32-bit long while IPv6 addresses are 128-bit
long.
IP Port: A 16-bit value representing the port to use with this IP
Address.
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The ADDITIONAL_ADDRESSES frame is ack-eliciting. When a packet
containing an ADDITIONAL_ADDRESSES frame is lost and its content is
still relevant, the sender MAY retransmit the frame as is.
Otherwise, sending a new frame with a new Sequence number is
preferred.
The server can update the client on its additional addresses at any
time by sending an ADDITIONAL_ADDRESSES frame. When a client is
using one of these additional addresses and receives an
ADDITIONAL_ADDRESSES frame not containing this address, it SHOULD
stop using it in favor of another address.
6. Security Considerations
This document specifies a mechanism allowing servers to influence the
IP addresses towards which clients send QUIC packets. In this case,
a malicious server could cause a client to send packets to a victim.
A countermeasure similar to Section 21.5.3 of [QUIC-TRANSPORT] is to
limit the packets that are sent to a non-validated additional
addresses.
Given that a server can provide additional addresses at any point in
time, a malicious server could overload a client and direct it
against many addresses. To alleviate this, a client can choose to
limit the number of addresses it keeps track of and the frequency at
which it considers them.
A client MUST NOT send non-probing frames to an additional address
prior to validating that address. The generic measures described in
Section 21.5.6 of [QUIC-TRANSPORT] also remain applicable for further
mitigation.
7. IANA Considerations
This document defines a new transport parameter for indicating
support for additional addresses. The draft defines provisional
identifiers for experiments. IANA will allocate the final
identifiers.
The following entry in Table 1 should be added to the "QUIC Transport
Parameters" registry under the "QUIC" heading.
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+==================+======================+===============+
| Value | Parameter Name. | Specification |
+==================+======================+===============+
| TBD (experiments | additional_addresses | Section 4 |
| use 0x925addaXX) | | |
+------------------+----------------------+---------------+
Table 1: Addition to QUIC Transport Parameters Entries
The last byte of the experimental transport parameter ID is used by
implementations to indicate the version of this document they
support. For instance, the value 0x925adda01 indicates the support
of the -01 version of this document.
The following entry in Table 1 should be added to the "QUIC Frame
Types" registry under the "QUIC" heading.
+==================+======================+===============+
| Value | Frame Type Name | Specification |
+==================+======================+===============+
| TBD (experiments | ADDITIONAL_ADDRESSES | Section 4 |
| use 0x925addaXX) | | |
+------------------+----------------------+---------------+
Table 2: Addition to QUIC Frame Types Entries
The last byte of the experimental frame type is used by
implementations to indicate the version of this document they
support. For instance, the value 0x925adda01 indicates the support
of the -01 version of this document.
8. References
8.1. Normative References
[QUIC-TRANSPORT]
Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based
Multiplexed and Secure Transport", RFC 9000,
DOI 10.17487/RFC9000, May 2021,
<https://www.rfc-editor.org/rfc/rfc9000>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>.
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[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.
8.2. Informative References
[MULTIPATH-QUIC]
Liu, Y., Ma, Y., De Coninck, Q., Bonaventure, O., Huitema,
C., and M. Kühlewind, "Multipath Extension for QUIC", Work
in Progress, Internet-Draft, draft-ietf-quic-multipath-06,
23 October 2023, <https://datatracker.ietf.org/doc/html/
draft-ietf-quic-multipath-06>.
[RFC8678] Baker, F., Bowers, C., and J. Linkova, "Enterprise
Multihoming using Provider-Assigned IPv6 Addresses without
Network Prefix Translation: Requirements and Solutions",
RFC 8678, DOI 10.17487/RFC8678, December 2019,
<https://www.rfc-editor.org/rfc/rfc8678>.
Acknowledgments
We thank Quentin De Coninck and François Michel for their feedback
and comments on the first version of this document.
We thank Marcel Kempf, Moritz Buhl, Louis Navarre and François Michel
for joining the interop during the IETF 118 Hackathon.
Authors' Addresses
Maxime Piraux
UCLouvain & WEL RI
Email: maxime.piraux@uclouvain.be
Olivier Bonaventure
UCLouvain & WEL RI
Email: olivier.bonaventure@uclouvain.be
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