[Advanced]: four keys to bound what the HTTP/3 receive path buffers - #347
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Four keys under [Advanced], each bridged to a field of xqc_conn_settings_t on both the client and the server path: H3BodyBufPerStream .max_body_buf_per_stream BlockedBufPerStream .max_blocked_buf_per_stream BlockedBufPerConn .max_blocked_buf_per_conn MaxRecvWindow .max_recv_window All four default to 0, 0 means "leave xquic's own default alone", and nothing in this tree sets a non-zero value. They follow RecvRateLimit's route: mqvpn_file_config_t, mqvpn_client_cfg_t / mqvpn_server_cfg_t, the two CLI -> library bridges, mqvpn_config_s, and mqvpn_conn_settings_input_t. mqvpn_build_conn_settings() assigns them outside the is_server if/else that hard-zeroes recv_rate_bytes_per_sec for servers. tests/test_conn_settings.c pins both sides; tests/check_buf_limits_bridged.sh gates the two bridges, one of which is inside linux_platform_run_server(), where no unit test reaches it. xqc_conn_settings_t.max_blocked_buf_per_stream and .max_blocked_buf_per_conn are in the xquic this repository pins. .max_body_buf_per_stream and .max_recv_window are not, as of this commit, so H3BodyBufPerStream and MaxRecvWindow cannot be used against it: CMake probes for each field (check_struct_has_member), the builder assigns only the fields that are there, and mqvpn refuses to start on a non-zero value it cannot honour, naming the key. 0 is accepted on any build. The check sits below the --status early exit in main(). Exceeding either BlockedBuf limit closes the HTTP/3 connection with H3_EXCESSIVE_LOAD (third_party/xquic/src/http3/xqc_h3_stream.c). Docs in website/guide/configuration.md and website/ja/guide/configuration.md. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe change adds four Advanced receive-buffer limits, detects optional xquic fields, validates unsupported settings, propagates values to client and server connection settings, and adds parsing, forwarding, saturation, source-gate, and documentation coverage. ChangesAdvanced buffer-limit configuration
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ConfigFile
participant main
participant PlatformBridge
participant ConnectionSettings
participant xquic
ConfigFile->>main: load four Advanced limits
main->>main: reject unsupported non-zero fields
main->>PlatformBridge: pass client or server limits
PlatformBridge->>ConnectionSettings: build connection settings
ConnectionSettings->>xquic: apply supported clamped fields
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✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 46.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 30 functions across 17 files. (2 skipped: 2 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@website/guide/configuration.md`:
- Around line 355-357: Update the BlockedBufPerStream, BlockedBufPerConn, and
MaxRecvWindow rows in both configuration guides to document that
MQVPN_CONFIG_MAX_BUF_LIMIT caps all three settings, values above 4294967295 are
warned and ignored without changing an existing value, and the default remains 0
when no valid value is provided. Preserve the existing server/client semantics,
including 0 being unbounded for client blocked-buffer settings.
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CMakeLists.txtsrc/config.csrc/config.hsrc/main.csrc/mqvpn_client.csrc/mqvpn_config.csrc/mqvpn_conn_settings.csrc/mqvpn_conn_settings.hsrc/mqvpn_internal.hsrc/mqvpn_server.csrc/platform/client_config_bridge.csrc/platform/linux/platform_linux.csrc/vpn_client.hsrc/vpn_server.htests/check_buf_limits_bridged.shtests/test_config.ctests/test_config_bridge.ctests/test_conn_settings.cwebsite/guide/configuration.mdwebsite/ja/guide/configuration.md
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BlockedBufPerStream, BlockedBufPerConn and MaxRecvWindow are capped at MQVPN_CONFIG_MAX_BUF_LIMIT (4294967295). A larger value makes cfg_key_store() return before writing, and the INI path logs it as invalid and ignores it, so the key keeps its previous value. For the two blocked-buffer keys that matters on a client, where 0 means unbounded: an oversized value meant as a large bound leaves the client with no bound at all. H3BodyBufPerStream already said this; the other three rows now do too, in both guides.
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These settings exist in xquic's
xqc_conn_settings_tbut nothing in mqvpn canreach them, so what the HTTP/3 receive path buffers is whatever xquic defaults
to.
max_body_buf_per_streamis the one that has no default to fall back on —it is the subject of alibaba/xquic#959, where the buffer it bounds has no limit
at all.
Four keys under [Advanced], each set on both the client and the server path.
All four default to 0; 0 means "leave xquic's own default alone", and nothing
in the tree sets a non-zero value.
H3BodyBufPerStream xqc_conn_settings_t.max_body_buf_per_stream
BlockedBufPerStream xqc_conn_settings_t.max_blocked_buf_per_stream
BlockedBufPerConn xqc_conn_settings_t.max_blocked_buf_per_conn
MaxRecvWindow xqc_conn_settings_t.max_recv_window
Two of them cannot be used against the xquic this repository pins: at 0487d0be,
grep -rn "max_body_buf_per_stream\|max_recv_window" third_party/xquic/includereturns nothing. CMake probes xqc_conn_settings_t for each field, the builder
assigns only what is there, and mqvpn refuses to start on a non-zero value it
cannot honour, naming the key; 0 is accepted on any build. The other two do work
at that pin (xquic.h:1640, :1647), and exceeding either closes the HTTP/3
connection with H3_EXCESSIVE_LOAD (xqc_h3_stream.c:1722, :1732, :1823, :1832).
max_body_buf_per_stream is the subject of alibaba/xquic#959. Happy to send only
the two keys that work against the pinned xquic today instead.
./build.sh && cd build && ctest # 38/38 before, 39/39 after
bash ../tests/check_buf_limits_bridged.sh
On b9227aa with its own submodule pins (xquic 0487d0be, lwip 821af199): 39/39,
and clang-format 18.1.3 over src include tests is clean.
Summary by CodeRabbit
New Features
Documentation
Tests