High level overview of QUIC Implementation

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18406)

diff --git a/doc/designs/quic-design/images/quic-overview.svg b/doc/designs/quic-design/images/quic-overview.svg
new file mode 100644 (file)
index 0000000..4c5c76d
--- /dev/null
+++ b/doc/designs/quic-design/images/quic-overview.svg
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diff --git a/doc/designs/quic-design/quic-overview.md b/doc/designs/quic-design/quic-overview.md
new file mode 100644 (file)
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--- /dev/null
+++ b/doc/designs/quic-design/quic-overview.md
@@ -0,0 +1,128 @@
+QUIC Design Overview
+====================
+
+The QUIC implementation in OpenSSL is roughly described by the following
+picture.
+
+![alt_text](images/quic-overview.svg "QUIC Implementation Building Blocks")
+
+SSL API
+-------
+
+The application facing public API of the OpenSSL library.
+
+Stream Send and Read Buffers
+----------------------------
+
+Buffers for stream data to be sent or received from the peer over the
+QUIC protocol. These are necessary to support existing semantics of the
+SSL_read and SSL_write functions.
+
+They will be bypassed with a single-copy API for read and write (_not
+for MVP_).
+
+Connection State Machine
+------------------------
+
+A state machine handling the state for a QUIC connection.
+
+Connection ID Cache
+-------------------
+
+A table matching Connection IDs with Connection objects represented
+via SSL objects.
+
+_In MVP there is basically 1-to-1 matching of Connection IDs to Connection
+objects. This will be changed with Path migration support and QUIC
+server support._
+
+Timer And Event Queue
+---------------------
+
+Queue of events that need to be handled asynchronously or at a later
+time.
+
+TLS Handshake Record Layer
+--------------------------
+
+A module that uses the Record Layer API to implement the inner TLS-1.3
+protocol handshake. It produces and parses the QUIC CRYPTO frames.
+
+TX Packetizer
+-------------
+
+This module creates frames from the application data obtained from
+the application. It also receives CRYPTO frames from the TLS Handshake
+Record Layer and ACK frames from the ACK Handling And Loss Detector
+subsystem.
+
+RX Frame Handler
+----------------
+
+Decrypted packets are split into frames here and the frames are forwarded
+either as data or as events to the subsequent modules based on the frame
+type. Flow Controller And Statistics Collector is consulted for decisions
+and to record the statistics of the received stream data.
+
+Flow Controller And Statistics Collector
+----------------------------------------
+
+This module collects various statistics about send and received
+stream data. It is also consulted by the TX Packetizer and RX Frame
+Handler for flow control decisions.
+
+QUIC Write Record Layer
+-----------------------
+
+Encryption of packets according to the given encryption level and with
+the appropriate negotiated algorithm happens here.
+
+Resulting packets are sent through the Datagram BIO interface to the
+network.
+
+QUIC Read Record Layer
+----------------------
+
+Decryption of packets according to the given encryption level and with
+the appropriate negotiated algorithm happens here.
+
+Packets are received from the network through the Datagram BIO interface.
+
+Congestion Controller
+---------------------
+
+This is a pluggable API that provides calls to record data relevant
+for congestion control decisions and to query for decision on whether
+more data is allowed to be sent or not.
+
+The module is called by the TX Packetizer and the ACK Handling And
+Loss Detector modules.
+
+ACK Handling And Loss Detector
+------------------------------
+
+A module that tracks packets sent to the peer and received ACK frames.
+It detects lost packets (after an ACK is not received in time). It informs
+TX packetizer that it can drop frames waiting to be ACKed when ACK is received.
+It also schedules retransmits of frames from packets that are considered
+to be lost.
+
+The module also handles the receiving side - it schedules when ACK frames should
+be sent for the received packets.
+
+Path And Conn Demultiplexer
+---------------------------
+
+On server side this module is shared between multiple SSL connection objects
+which makes it a special kind of module. It dispatches the received packets
+to the appropriate SSL Connection by consulting the Connection ID Cache.
+
+_For client side and MVP this module just checks that the received packet has
+the appropriate Connection ID and optionally schedules sending stateless
+reset for packets with other Connection IDs._
+
+Datagram BIO
+------------
+
+Implementation of BIO layer that supports `BIO_sendmmsg` and `BIO_recvmmsg`
+calls.