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Reword unpadded PATH_CHALLENGE language #4580

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Jan 7, 2021
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Reword unpadded PATH_CHALLENGE language #4580

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Reword unpadded PATH_CHALLENGE language
martinthomson Jan 6, 2021
3dae7fe
Reword PATH_CHALLENGE validation
martinthomson Jan 6, 2021
54ed38f
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martinthomson Jan 7, 2021
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martinthomson Jan 7, 2021
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12 changes: 6 additions & 6 deletions draft-ietf-quic-transport.md
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Expand Up @@ -2301,12 +2301,12 @@ the data that was sent in a previous PATH_CHALLENGE frame. A PATH_RESPONSE
frame received on any network path validates the path on which the
PATH_CHALLENGE was sent.

If the PATH_CHALLENGE frame that resulted in successful path validation was sent
in a datagram that was not expanded to at least 1200 bytes, the endpoint can
regard the address as valid. The endpoint is then able to send more than three
times the amount of data that has been received. However, the endpoint MUST
initiate another path validation with an expanded datagram to verify that the
path supports required MTU.
If an endpoint sends a PATH_CHALLENGE frame in a datagram that is not expanded
to at least 1200 bytes, and if the response to it validates the peer address,
the path is validated but not the path MTU. As a result, the endpoint can now
send more than three times the amount of data that has been received. However,
the endpoint MUST initiate another path validation with an expanded datagram to
verify that the path supports the required MTU.

Receipt of an acknowledgment for a packet containing a PATH_CHALLENGE frame is
not adequate validation, since the acknowledgment can be spoofed by a malicious
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