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Various version negotiation fixes #474

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merged 2 commits into from May 3, 2017
Merged

Various version negotiation fixes #474

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6117221
Various version negotiation fixes
martinthomson Apr 27, 2017
a28e803
Reword text on ignoring own version
martinthomson May 3, 2017
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18 changes: 14 additions & 4 deletions draft-ietf-quic-transport.md
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Expand Up @@ -822,8 +822,13 @@ compares the client's version to the versions it supports.
If the version selected by the client is not acceptable to the server, the
server discards the incoming packet and responds with a Version Negotiation
packet ({{version-packet}}). This includes a list of versions that the server
will accept. A server MUST send a Version Negotiation packet for every packet
that it receives with an unacceptable version.
will accept.

A server sends a Version Negotiation packet for every packet that it receives
with an unacceptable version. This allows a server to process packets with
unsupported versions without retaining state. Though either the initial client
packet or the version negotiation packet that is sent in response could be lost,
the client will send new packets until it successfully receives a response.

If the packet contains a version that is acceptable to the server, the server
proceeds with the handshake ({{handshake}}). This commits the server to the
Expand All @@ -843,8 +848,13 @@ which is not a Version Negotiation packet.

A client MUST NOT change the version it uses unless it is in response to a
Version Negotiation packet from the server. Once a client receives a packet
from the server which is not a Version Negotiation packet, it MUST ignore
Version Negotiation packets on the same connection.
from the server which is not a Version Negotiation packet, it MUST ignore other
Version Negotiation packets on the same connection. Similarly, a client MUST
ignore a Version Negotiation packet if it has already received and acted on a
Version Negotiation packet.

A client MUST ignore a Version Negotiation packet that lists the client's chosen
version.

Version negotiation uses unprotected data. The result of the negotiation MUST be
revalidated as part of the cryptographic handshake (see {{version-validation}}).
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