Draft 23

[juliens]

Transport

• Rules for preventing correlation by connection ID tightened
  (Discuss requirement that connection IDs not be correlatable quicwg/base-drafts#2084, Minor clarification. Fixes #2084 quicwg/base-drafts#2929)

• Clarified use of CONNECTION_CLOSE in Handshake packets (Where can you send CONNECTION_CLOSE quicwg/base-drafts#2151,
  Clients cannot abandon Initial packets while server can still send initial close quicwg/base-drafts#2541, Clarify server CONNECTION_CLOSE with Handshake quicwg/base-drafts#2688)

• Discourage regressions of largest acknowledged in ACK (Largest acked in ACK frame MUST NOT decrease quicwg/base-drafts#2205,
  ECN verification text quicwg/base-drafts#2752)

• Improved robusness of validation process for ECN counts (ECN text disables ECN too aggressively quicwg/base-drafts#2534,
  ECN verification text quicwg/base-drafts#2752)

• Require endpoints to ignore spurious migration attempts (Spoofed connection migration as a DoS vector quicwg/base-drafts#2342,
  Remove DoS vector for spoofed connection migration quicwg/base-drafts#2893)

• Transport parameter for disabling migration clarified to allow NAT
  rebinding (Be clearer about the purpose of disable_migration quicwg/base-drafts#2389, Remove DoS vector for spoofed connection migration quicwg/base-drafts#2893)

• Document principles for defining new error codes (Articulate principles for definition of error codes quicwg/base-drafts#2388, Articulate error code principles quicwg/base-drafts#2880)

• Reserve transport parameters for greasing (Apply GREASE to transport parameters quicwg/base-drafts#2550, grease transport parameters quicwg/base-drafts#2873)

• A maximum ACK delay of 0 is used for handshake packet number
  spaces (use max_ack_delay = 0 before receving the TPs quicwg/base-drafts#2646, max_ack_delay is unknown when a new connection is established quicwg/base-drafts#2638)

• Improved rules for use of congestion control state on new paths
  (CC state after a change of path? quicwg/base-drafts#2685, Fix language around CC on migration quicwg/base-drafts#2918)

• Removed recommendation to coordinate spin for multiple connections
  that share a path (Coordinating spin quicwg/base-drafts#2763, Remove spin coordination requirement quicwg/base-drafts#2882)

• Allow smaller stateless resets and recommend a smaller minimum on
  packets that might trigger a stateless reset (If you want a Stateless Reset you need to send a larger packet than before quicwg/base-drafts#2770, Stateless Reset packet sizes should not depend on the maximum connection ID length quicwg/base-drafts#2869, Allow Smaller Stateless Resets quicwg/base-drafts#2927)

• Provide guidance around the interface to QUIC as used by
  application protocols (Rationalize terminology around transport/application interactions quicwg/base-drafts#2805, Define terms for application actions quicwg/base-drafts#2857)

• Frames other than STREAM can cause STREAM_LIMIT_ERROR (Exceeding Max STREAM ID should be a connection error quicwg/base-drafts#2825,
  Make exceeding stream limits a connection error quicwg/base-drafts#2826)

recovery

• PTO should always send an ack-eliciting packet (Advise bundling a PING or other small ACK eliciting frame with Initials quicwg/base-drafts#2895)

• Unify the Handshake Timer with the PTO timer (Crypto timeout value should include rttvar quicwg/base-drafts#2648, Fix typo: drop a doubled word quicwg/base-drafts#2658, Crypto Retransmission Timeout interacts poorly with Congestion Control quicwg/base-drafts#2886)

• Move ACK generation text to transport draft (ACK-only feedback loop in recovery instead of transport quicwg/base-drafts#1860, Move Generating Acknowledgements to Transport quicwg/base-drafts#2916)

TLS

• Update the salt used for Initial secrets (Get test vectors in place for -23 quicwg/base-drafts#2887, TLS vectors for -23 didn't update the keys quicwg/base-drafts#2980)

HTTP

• Removed priority signaling (Remove PRIORITY quicwg/base-drafts#2922)

• Further changes to error codes (Replace HTTP_MALFORMED_FRAME error code quicwg/base-drafts#2662):
  Fix by update HTTP/3 errors quic-go/quic-go#2112

  • Error codes renumbered

  • HTTP_MALFORMED_FRAME replaced by HTTP_FRAME_ERROR,
    HTTP_ID_ERROR, and others

• Clarify how unknown frame types interact with required frame
  sequence (Tighten HEADERS and DATA frame order requirements. quicwg/base-drafts#2867)

• Describe interactions with the transport in terms of defined
  interface terms (Define terms for application actions quicwg/base-drafts#2857)

• Require the use of the "http-opportunistic" resource (RFC 8164)
  when scheme is "http" (Clarify use of HTTP request with http scheme over HTTP/3  quicwg/base-drafts#2439)

• Settings identifiers cannot be duplicated (Forbid duplicate setting identifiers. quicwg/base-drafts#2979)

• Changes to SETTINGS frames in 0-RTT (Send complete SETTINGS quicwg/base-drafts#2972):

  • Servers must send all settings with non-default values in their
    SETTINGS frame, even when resuming

  • If a client doesn't have settings associated with a 0-RTT
    ticket, it uses the defaults

  • Servers can't accept early data if they cannot recover the
    settings the client will have remembered

• Clarify that Upgrade and the 101 status code are prohibited
  (HTTP Upgrade in H3 is silliness quicwg/base-drafts#2898)

• Clarify that frame types reserved for greasing can occur on any
  stream, but frame types reserved due to HTTP/2 correspondence are
  prohibited (Reserved frame types and the other reserved frame types quicwg/base-drafts#2997)

• Unknown error codes cannot be treated as errors (Error codes can't cause errors quicwg/base-drafts#2998)