| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Definitions and utility functions related to handling of QUIC versions. |
| // |
| // QUIC version is a four-byte tag that can be represented in memory as a |
| // QuicVersionLabel type (which is an alias to uint32_t). In actuality, all |
| // versions supported by this implementation have the following format: |
| // [QT]0\d\d |
| // e.g. Q046. Q or T distinguishes the type of handshake used (Q for QUIC |
| // Crypto handshake, T for TLS-based handshake), and the two digits at the end |
| // is the actual numeric value of transport version used by the code. |
| |
| #ifndef QUICHE_QUIC_CORE_QUIC_VERSIONS_H_ |
| #define QUICHE_QUIC_CORE_QUIC_VERSIONS_H_ |
| |
| #include <string> |
| #include <vector> |
| |
| #include "net/third_party/quiche/src/quic/core/quic_tag.h" |
| #include "net/third_party/quiche/src/quic/core/quic_types.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_export.h" |
| |
| namespace quic { |
| |
| // The available versions of QUIC. The numeric value of the enum is guaranteed |
| // to match the number in the name. The versions not currently supported are |
| // documented in comments. |
| // |
| // See go/new-quic-version for more details on how to roll out new versions. |
| enum QuicTransportVersion { |
| // Special case to indicate unknown/unsupported QUIC version. |
| QUIC_VERSION_UNSUPPORTED = 0, |
| |
| // Version 1 was the first version of QUIC that supported versioning. |
| // Version 2 decoupled versioning of non-cryptographic parameters from the |
| // SCFG. |
| // Version 3 moved public flags into the beginning of the packet. |
| // Version 4 added support for variable-length connection IDs. |
| // Version 5 made specifying FEC groups optional. |
| // Version 6 introduced variable-length packet numbers. |
| // Version 7 introduced a lower-overhead encoding for stream frames. |
| // Version 8 made salt length equal to digest length for the RSA-PSS |
| // signatures. |
| // Version 9 added stream priority. |
| // Version 10 redid the frame type numbering. |
| // Version 11 reduced the length of null encryption authentication tag |
| // from 16 to 12 bytes. |
| // Version 12 made the sequence numbers in the ACK frames variable-sized. |
| // Version 13 added the dedicated header stream. |
| // Version 14 added byte_offset to RST_STREAM frame. |
| // Version 15 added a list of packets recovered using FEC to the ACK frame. |
| // Version 16 added STOP_WAITING frame. |
| // Version 17 added per-stream flow control. |
| // Version 18 added PING frame. |
| // Version 19 added connection-level flow control |
| // Version 20 allowed to set stream- and connection-level flow control windows |
| // to different values. |
| // Version 21 made header and crypto streams flow-controlled. |
| // Version 22 added support for SCUP (server config update) messages. |
| // Version 23 added timestamps into the ACK frame. |
| // Version 24 added SPDY/4 header compression. |
| // Version 25 added support for SPDY/4 header keys and removed error_details |
| // from RST_STREAM frame. |
| // Version 26 added XLCT (expected leaf certificate) tag into CHLO. |
| // Version 27 added a nonce into SHLO. |
| // Version 28 allowed receiver to refuse creating a requested stream. |
| // Version 29 added support for QUIC_STREAM_NO_ERROR. |
| // Version 30 added server-side support for certificate transparency. |
| // Version 31 incorporated the hash of CHLO into the crypto proof supplied by |
| // the server. |
| // Version 32 removed FEC-related fields from wire format. |
| // Version 33 added diversification nonces. |
| // Version 34 removed entropy bits from packets and ACK frames, removed |
| // private flag from packet header and changed the ACK format to |
| // specify ranges of packets acknowledged rather than missing |
| // ranges. |
| // Version 35 allows endpoints to independently set stream limit. |
| // Version 36 added support for forced head-of-line blocking experiments. |
| // Version 37 added perspective into null encryption. |
| // Version 38 switched to IETF padding frame format and support for NSTP (no |
| // stop waiting frame) connection option. |
| |
| // Version 39 writes integers and floating numbers in big endian, stops acking |
| // acks, sends a connection level WINDOW_UPDATE every 20 sent packets which do |
| // not contain retransmittable frames. |
| |
| // Version 40 was an attempt to convert QUIC to IETF frame format; it was |
| // never shipped due to a bug. |
| // Version 41 was a bugfix for version 40. The working group changed the wire |
| // format before it shipped, which caused it to be never shipped |
| // and all the changes from it to be reverted. No changes from v40 |
| // or v41 are present in subsequent versions. |
| // Version 42 allowed receiving overlapping stream data. |
| |
| QUIC_VERSION_43 = 43, // PRIORITY frames are sent by client and accepted by |
| // server. |
| // Version 44 used IETF header format from draft-ietf-quic-invariants-05. |
| |
| // Version 45 added MESSAGE frame. |
| |
| QUIC_VERSION_46 = 46, // Use IETF draft-17 header format with demultiplexing |
| // bit. |
| // Version 47 added variable-length QUIC server connection IDs. |
| QUIC_VERSION_48 = 48, // Use CRYPTO frames for the handshake. |
| QUIC_VERSION_49 = 49, // Client connection IDs, long header lengths, IETF |
| // header format from draft-ietf-quic-invariants-06. |
| QUIC_VERSION_50 = 50, // Header protection and initial obfuscators. |
| QUIC_VERSION_99 = 99, // Dumping ground for IETF QUIC changes which are not |
| // yet ready for production. |
| // QUIC_VERSION_RESERVED_FOR_NEGOTIATION is sent over the wire as ?a?a?a?a |
| // which is part of a range reserved by the IETF for version negotiation |
| // testing (see the "Versions" section of draft-ietf-quic-transport). |
| // This version is intentionally meant to never be supported to trigger |
| // version negotiation when proposed by clients and to prevent client |
| // ossification when sent by servers. |
| QUIC_VERSION_RESERVED_FOR_NEGOTIATION = 999, |
| }; |
| |
| // IETF draft version most closely approximated by TLS + v99. |
| static const int kQuicIetfDraftVersion = 23; |
| |
| // The crypto handshake protocols that can be used with QUIC. |
| enum HandshakeProtocol { |
| PROTOCOL_UNSUPPORTED, |
| PROTOCOL_QUIC_CRYPTO, |
| PROTOCOL_TLS1_3, |
| }; |
| |
| // A parsed QUIC version label which determines that handshake protocol |
| // and the transport version. |
| struct QUIC_EXPORT_PRIVATE ParsedQuicVersion { |
| HandshakeProtocol handshake_protocol; |
| QuicTransportVersion transport_version; |
| |
| constexpr ParsedQuicVersion(HandshakeProtocol handshake_protocol, |
| QuicTransportVersion transport_version) |
| : handshake_protocol(handshake_protocol), |
| transport_version(transport_version) {} |
| |
| constexpr ParsedQuicVersion(const ParsedQuicVersion& other) |
| : handshake_protocol(other.handshake_protocol), |
| transport_version(other.transport_version) {} |
| |
| ParsedQuicVersion& operator=(const ParsedQuicVersion& other) { |
| if (this != &other) { |
| handshake_protocol = other.handshake_protocol; |
| transport_version = other.transport_version; |
| } |
| return *this; |
| } |
| |
| bool operator==(const ParsedQuicVersion& other) const { |
| return handshake_protocol == other.handshake_protocol && |
| transport_version == other.transport_version; |
| } |
| |
| bool operator!=(const ParsedQuicVersion& other) const { |
| return handshake_protocol != other.handshake_protocol || |
| transport_version != other.transport_version; |
| } |
| |
| bool KnowsWhichDecrypterToUse() const; |
| |
| // Returns whether this version uses keys derived from the Connection ID for |
| // ENCRYPTION_INITIAL keys (instead of NullEncrypter/NullDecrypter). |
| bool UsesInitialObfuscators() const; |
| |
| // Indicates that this QUIC version does not have an enforced minimum value |
| // for flow control values negotiated during the handshake. |
| bool AllowsLowFlowControlLimits() const; |
| |
| // Returns whether header protection is used in this version of QUIC. |
| bool HasHeaderProtection() const; |
| |
| // Returns whether this version supports IETF RETRY packets. |
| bool SupportsRetry() const; |
| |
| // Returns true if this version sends variable length packet number in long |
| // header. |
| bool SendsVariableLengthPacketNumberInLongHeader() const; |
| |
| // Returns whether this version supports client connection ID. |
| bool SupportsClientConnectionIds() const; |
| |
| // Returns whether this version supports long header 8-bit encoded |
| // connection ID lengths as described in draft-ietf-quic-invariants-06 and |
| // draft-ietf-quic-transport-22. |
| bool HasLengthPrefixedConnectionIds() const; |
| |
| // Returns whether this version supports IETF style anti-amplification limit, |
| // i.e., server will send no more than FLAGS_quic_anti_amplification_factor |
| // times received bytes until address can be validated. |
| bool SupportsAntiAmplificationLimit() const; |
| }; |
| |
| QUIC_EXPORT_PRIVATE ParsedQuicVersion UnsupportedQuicVersion(); |
| |
| QUIC_EXPORT_PRIVATE ParsedQuicVersion QuicVersionReservedForNegotiation(); |
| |
| QUIC_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os, |
| const ParsedQuicVersion& version); |
| |
| using ParsedQuicVersionVector = std::vector<ParsedQuicVersion>; |
| |
| // Representation of the on-the-wire QUIC version number. Will be written/read |
| // to the wire in network-byte-order. |
| using QuicVersionLabel = uint32_t; |
| using QuicVersionLabelVector = std::vector<QuicVersionLabel>; |
| |
| // This vector contains QUIC versions which we currently support. |
| // This should be ordered such that the highest supported version is the first |
| // element, with subsequent elements in descending order (versions can be |
| // skipped as necessary). |
| // |
| // See go/new-quic-version for more details on how to roll out new versions. |
| static const QuicTransportVersion kSupportedTransportVersions[] = { |
| QUIC_VERSION_99, QUIC_VERSION_50, QUIC_VERSION_49, |
| QUIC_VERSION_48, QUIC_VERSION_46, QUIC_VERSION_43, |
| }; |
| |
| // This vector contains all crypto handshake protocols that are supported. |
| static const HandshakeProtocol kSupportedHandshakeProtocols[] = { |
| PROTOCOL_QUIC_CRYPTO, PROTOCOL_TLS1_3}; |
| |
| typedef std::vector<QuicTransportVersion> QuicTransportVersionVector; |
| |
| // Returns a vector of QUIC versions in kSupportedTransportVersions. |
| QUIC_EXPORT_PRIVATE QuicTransportVersionVector AllSupportedTransportVersions(); |
| |
| // Returns a vector of QUIC versions that is the cartesian product of |
| // kSupportedTransportVersions and kSupportedHandshakeProtocols. |
| QUIC_EXPORT_PRIVATE ParsedQuicVersionVector AllSupportedVersions(); |
| |
| // Returns a vector of QUIC versions from kSupportedTransportVersions which |
| // exclude any versions which are disabled by flags. |
| QUIC_EXPORT_PRIVATE QuicTransportVersionVector |
| CurrentSupportedTransportVersions(); |
| |
| // Returns a vector of QUIC versions that is the cartesian product of |
| // kSupportedTransportVersions and kSupportedHandshakeProtocols, with any |
| // versions disabled by flags excluded. |
| QUIC_EXPORT_PRIVATE ParsedQuicVersionVector CurrentSupportedVersions(); |
| |
| // Returns a vector of QUIC versions from |versions| which exclude any versions |
| // which are disabled by flags. |
| QUIC_EXPORT_PRIVATE QuicTransportVersionVector |
| FilterSupportedTransportVersions(QuicTransportVersionVector versions); |
| |
| // Returns a vector of QUIC versions from |versions| which exclude any versions |
| // which are disabled by flags. |
| QUIC_EXPORT_PRIVATE ParsedQuicVersionVector |
| FilterSupportedVersions(ParsedQuicVersionVector versions); |
| |
| // Returns QUIC version of |index| in result of |versions|. Returns |
| // QUIC_VERSION_UNSUPPORTED if |index| is out of bounds. |
| QUIC_EXPORT_PRIVATE QuicTransportVersionVector |
| VersionOfIndex(const QuicTransportVersionVector& versions, int index); |
| |
| // Returns QUIC version of |index| in result of |versions|. Returns |
| // UnsupportedQuicVersion() if |index| is out of bounds. |
| QUIC_EXPORT_PRIVATE ParsedQuicVersionVector |
| ParsedVersionOfIndex(const ParsedQuicVersionVector& versions, int index); |
| |
| // Returns a vector of QuicTransportVersions corresponding to just the transport |
| // versions in |versions|. If the input vector contains multiple parsed versions |
| // with different handshake protocols (but the same transport version), that |
| // transport version will appear in the resulting vector multiple times. |
| QUIC_EXPORT_PRIVATE QuicTransportVersionVector |
| ParsedVersionsToTransportVersions(const ParsedQuicVersionVector& versions); |
| |
| // QuicVersionLabel is written to and read from the wire, but we prefer to use |
| // the more readable ParsedQuicVersion at other levels. |
| // Helper function which translates from a QuicVersionLabel to a |
| // ParsedQuicVersion. |
| QUIC_EXPORT_PRIVATE ParsedQuicVersion |
| ParseQuicVersionLabel(QuicVersionLabel version_label); |
| |
| // Parses a QUIC version string such as "Q043" or "T099". |
| // Also supports parsing numbers such as "44". |
| QUIC_EXPORT_PRIVATE ParsedQuicVersion |
| ParseQuicVersionString(std::string version_string); |
| |
| // Constructs a QuicVersionLabel from the provided ParsedQuicVersion. |
| QUIC_EXPORT_PRIVATE QuicVersionLabel |
| CreateQuicVersionLabel(ParsedQuicVersion parsed_version); |
| |
| // Constructs a QuicVersionLabelVector from the provided |
| // ParsedQuicVersionVector. |
| QUIC_EXPORT_PRIVATE QuicVersionLabelVector |
| CreateQuicVersionLabelVector(const ParsedQuicVersionVector& versions); |
| |
| // QuicVersionLabel is written to and read from the wire, but we prefer to use |
| // the more readable QuicTransportVersion at other levels. |
| // Helper function which translates from a QuicTransportVersion to a |
| // QuicVersionLabel. Returns 0 if |version| is unsupported. |
| QUIC_EXPORT_PRIVATE QuicVersionLabel |
| QuicVersionToQuicVersionLabel(QuicTransportVersion transport_version); |
| |
| // Helper function which translates from a QuicVersionLabel to a string. |
| QUIC_EXPORT_PRIVATE std::string QuicVersionLabelToString( |
| QuicVersionLabel version_label); |
| |
| // Returns |separator|-separated list of string representations of |
| // QuicVersionLabel values in the supplied |version_labels| vector. The values |
| // after the (0-based) |skip_after_nth_version|'th are skipped. |
| QUIC_EXPORT_PRIVATE std::string QuicVersionLabelVectorToString( |
| const QuicVersionLabelVector& version_labels, |
| const std::string& separator, |
| size_t skip_after_nth_version); |
| |
| // Returns comma separated list of string representations of QuicVersionLabel |
| // values in the supplied |version_labels| vector. |
| QUIC_EXPORT_PRIVATE inline std::string QuicVersionLabelVectorToString( |
| const QuicVersionLabelVector& version_labels) { |
| return QuicVersionLabelVectorToString(version_labels, ",", |
| std::numeric_limits<size_t>::max()); |
| } |
| |
| // Returns appropriate QuicTransportVersion from a QuicVersionLabel. |
| // Returns QUIC_VERSION_UNSUPPORTED if |version_label| cannot be understood. |
| QUIC_EXPORT_PRIVATE QuicTransportVersion |
| QuicVersionLabelToQuicVersion(QuicVersionLabel version_label); |
| |
| // Returns the HandshakeProtocol used with the given |version_label|, returning |
| // PROTOCOL_UNSUPPORTED if it is unknown. |
| QUIC_EXPORT_PRIVATE HandshakeProtocol |
| QuicVersionLabelToHandshakeProtocol(QuicVersionLabel version_label); |
| |
| // Helper function which translates from a QuicTransportVersion to a string. |
| // Returns strings corresponding to enum names (e.g. QUIC_VERSION_6). |
| QUIC_EXPORT_PRIVATE std::string QuicVersionToString( |
| QuicTransportVersion transport_version); |
| |
| // Helper function which translates from a ParsedQuicVersion to a string. |
| // Returns strings corresponding to the on-the-wire tag. |
| QUIC_EXPORT_PRIVATE std::string ParsedQuicVersionToString( |
| ParsedQuicVersion version); |
| |
| // Returns comma separated list of string representations of |
| // QuicTransportVersion enum values in the supplied |versions| vector. |
| QUIC_EXPORT_PRIVATE std::string QuicTransportVersionVectorToString( |
| const QuicTransportVersionVector& versions); |
| |
| // Returns comma separated list of string representations of ParsedQuicVersion |
| // values in the supplied |versions| vector. |
| QUIC_EXPORT_PRIVATE std::string ParsedQuicVersionVectorToString( |
| const ParsedQuicVersionVector& versions); |
| |
| // Returns |separator|-separated list of string representations of |
| // ParsedQuicVersion values in the supplied |versions| vector. The values after |
| // the (0-based) |skip_after_nth_version|'th are skipped. |
| QUIC_EXPORT_PRIVATE std::string ParsedQuicVersionVectorToString( |
| const ParsedQuicVersionVector& versions, |
| const std::string& separator, |
| size_t skip_after_nth_version); |
| |
| // Returns comma separated list of string representations of ParsedQuicVersion |
| // values in the supplied |versions| vector. |
| QUIC_EXPORT_PRIVATE inline std::string ParsedQuicVersionVectorToString( |
| const ParsedQuicVersionVector& versions) { |
| return ParsedQuicVersionVectorToString(versions, ",", |
| std::numeric_limits<size_t>::max()); |
| } |
| |
| // Returns true if |transport_version| uses IETF invariant headers. |
| QUIC_EXPORT_PRIVATE inline bool VersionHasIetfInvariantHeader( |
| QuicTransportVersion transport_version) { |
| return transport_version > QUIC_VERSION_43; |
| } |
| |
| // Returns true if |transport_version| supports MESSAGE frames. |
| QUIC_EXPORT_PRIVATE inline bool VersionSupportsMessageFrames( |
| QuicTransportVersion transport_version) { |
| return transport_version >= QUIC_VERSION_46; |
| } |
| |
| // If true, HTTP/3 instead of gQUIC will be used at the HTTP layer. |
| // Notable changes are: |
| // * Headers stream no longer exists. |
| // * PRIORITY, HEADERS are moved from headers stream to HTTP/3 control stream. |
| // * PUSH_PROMISE is moved to request stream. |
| // * Unidirectional streams will have their first byte as a stream type. |
| // * HEADERS frames are compressed using QPACK. |
| // * DATA frame has frame headers. |
| // * GOAWAY is moved to HTTP layer. |
| QUIC_EXPORT_PRIVATE inline bool VersionUsesHttp3( |
| QuicTransportVersion transport_version) { |
| return transport_version == QUIC_VERSION_99; |
| } |
| |
| // Returns whether the transport_version supports the variable length integer |
| // length field as defined by IETF QUIC draft-13 and later. |
| QUIC_EXPORT_PRIVATE inline bool QuicVersionHasLongHeaderLengths( |
| QuicTransportVersion transport_version) { |
| return transport_version >= QUIC_VERSION_49; |
| } |
| |
| // Returns whether |transport_version| uses CRYPTO frames for the handshake |
| // instead of stream 1. |
| QUIC_EXPORT_PRIVATE inline bool QuicVersionUsesCryptoFrames( |
| QuicTransportVersion transport_version) { |
| return transport_version >= QUIC_VERSION_48; |
| } |
| |
| // Returns whether |transport_version| makes use of IETF QUIC |
| // frames or not. |
| QUIC_EXPORT_PRIVATE inline bool VersionHasIetfQuicFrames( |
| QuicTransportVersion transport_version) { |
| return transport_version >= QUIC_VERSION_99; |
| } |
| |
| // Returns whether this version supports long header 8-bit encoded |
| // connection ID lengths as described in draft-ietf-quic-invariants-06 and |
| // draft-ietf-quic-transport-22. |
| QUIC_EXPORT_PRIVATE bool VersionHasLengthPrefixedConnectionIds( |
| QuicTransportVersion transport_version); |
| |
| // Returns true if this version supports the old Google-style Alt-Svc |
| // advertisement format. |
| QUIC_EXPORT_PRIVATE bool VersionSupportsGoogleAltSvcFormat( |
| QuicTransportVersion transport_version); |
| |
| // Returns whether this version label supports long header 4-bit encoded |
| // connection ID lengths as described in draft-ietf-quic-invariants-05 and |
| // draft-ietf-quic-transport-21. |
| QUIC_EXPORT_PRIVATE bool QuicVersionLabelUses4BitConnectionIdLength( |
| QuicVersionLabel version_label); |
| |
| // Returns the ALPN string to use in TLS for this version of QUIC. |
| QUIC_EXPORT_PRIVATE std::string AlpnForVersion( |
| ParsedQuicVersion parsed_version); |
| |
| // Initializes support for the provided IETF draft version by setting the |
| // correct flags. |
| QUIC_EXPORT_PRIVATE void QuicVersionInitializeSupportForIetfDraft(); |
| |
| // Enables the flags required to support this version of QUIC. |
| QUIC_EXPORT_PRIVATE void QuicEnableVersion(ParsedQuicVersion parsed_version); |
| |
| } // namespace quic |
| |
| #endif // QUICHE_QUIC_CORE_QUIC_VERSIONS_H_ |