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quiche/quiche/e21fd5539b510cf783be1af790e942c09d8fb87f
commit
e21fd5539b510cf783be1af790e942c09d8fb87f
[log]
author
wub <wub@google.com>
Wed Jun 03 10:47:22 2026 -0700
committer
Copybara-Service <copybara-worker@google.com>
Wed Jun 03 10:47:49 2026 -0700
tree
ce7a4fb951487254054dfdaaa2018da95ce83786
parent
d89ce8a1499b61418a32552d94a3df15cc666ac1 [diff]
Fix QUIC MTU discovery enablement while `SoftMaxPacketLength` is set.

If SoftMaxPacketLength is set to a lower value than current max packet length, `QuicConnection::SetMtuDiscoveryTarget` will incorrectly enable MTU discovery with the first probe packet size being `(SoftMaxPacketLength + MaxPacketLength)/2`, since this is smaller than MaxPacketLength, a successful probe will not be able to increase the max packet length.

See the full bug report at https://github.com/google/quiche/issues/107.

Protected by FLAGS_quic_reloadable_flag_quic_fix_mtu_discovery.

PiperOrigin-RevId: 926136428
6 files changed
tree: ce7a4fb951487254054dfdaaa2018da95ce83786
  1. build/
  2. depstool/
  3. quiche/
  4. .bazelrc
  5. .bazelversion
  6. BUILD.bazel
  7. CONTRIBUTING.md
  8. LICENSE
  9. MODULE.bazel
  10. MODULE.bazel.lock
  11. README.md
  12. WHITESPACE
README.md

QUICHE

QUICHE stands for QUIC, Http, Etc. It is Google‘s production-ready implementation of QUIC, HTTP/2, HTTP/3, and related protocols and tools. It powers Google’s servers, Chromium, Envoy, and other projects. It is actively developed and maintained.

There are two public QUICHE repositories. Either one may be used by embedders, as they are automatically kept in sync:

To embed QUICHE in your project, platform APIs need to be implemented and build files need to be created. Note that it is on the QUICHE team's roadmap to include default implementation for all platform APIs and to open-source build files. In the meanwhile, take a look at open source embedders like Chromium and Envoy to get started:

To contribute to QUICHE, follow instructions at CONTRIBUTING.md.

QUICHE is only supported on little-endian platforms.

Build and run standalone QUICHE

QUICHE has binaries that can run on Linux platforms.

Follow the instructions to install Bazel.

sudo apt install libicu-dev clang lld
cd <directory that will be the root of your quiche implmentation>
git clone https://github.com/google/quiche.git
cd quiche
CC=clang bazel build -c opt //...
./bazel-bin/quiche/<target_name> <arguments>

There are several targets that can be built and then run. Full usage instructions are available using the --helpfull flag on any binary.

  • quic_packet_printer: from a provided packet, parses and prints out the contents that are accessible without decryption.

Usage: quic_packet_printer server|client <hex dump of packet>

  • crypto_message_printer: dumps the contents of a QUIC crypto handshake message in a human readable format.

Usage: crypto_message_printer_bin <hex of message>

  • quic_client: connects to a host using QUIC and HTTP/3, sends a request to the provided URL, and displays the response.

Usage: quic_client <URL>

  • quic_server: listens forever on --port (default 6121) until halted via ctrl-c.

  • masque_client: tunnels to a URL via an identified proxy (See RFC 9298).

Usage: masque_client [options] <proxy-url> <urls>

  • masque_server: a MASQUE tunnel proxy that defaults to port 9661.

Usage: masque_server

  • web_transport_test_server: a server that clients can connect to via WebTransport.

  • moqt_relay: a relay for the Media Over QUIC transport for publishers and subscribers can connect to.

Usage: moqt_relay

Logging

Most log messages in QUICHE use the QUICHE_DLOG macro. In standalone quiche, these all either go to stderr, or are suppressed, based on the --stderrthreshold flag.

To send INFO level log messages to a file, you would therefore invoke

<binary> <args> > <logfile> 2>&1

Use the --helpfull flag for more.