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plugin/proxyproto: expose PPv2 TLVs to downstream plugins as metadata (#8641)

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The proxyproto plugin parsed PROXY protocol v2 headers only to recover the real
client address; the TLV vector was discarded, so downstream plugins had no way to
read values such as the AWS VPC endpoint ID, SSL client CN, or vendor-specific
custom TLVs.

Add an opt-in `tlv_metadata` option. When set, the connection's raw PPv2 TLV
vector is captured and the plugin, acting as a metadata.Provider, publishes it
under the `proxyproto/tlv` label as a hex-encoded string. Consumers decode and
split it with proxyproto.SplitTLVs. The option is off by default, so existing
deployments skip the extra per-connection processing and behave exactly as before.
PROXY protocol v1 connections, which carry no TLVs, are unaffected.

Capture spans all transports: dns:// (UDP and TCP), tls:// (DoT), https:// (DoH),
grpc://, quic:// (DoQ), and https3:// (DoH3). QUIC-based transports require
udp_session_tracking, since the PPv2 header arrives as a standalone first datagram
ahead of the QUIC handshake.

Includes unit tests for capture, the metadata provider (direct and through the
real metadata chain), v1 compatibility, and option parsing, plus README and man
page updates.

Fixes #8633

Signed-off-by: Mekias Yohannes <mekias@amazon.com>
Co-authored-by: Mekias Yohannes <mekias@amazon.com>
This commit is contained in:
myohannes
2026-10-15 22:28:43 -04:00
committed by GitHub
parent 21660a66b5
commit 3909cc187c
18 changed files with 1209 additions and 20 deletions
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6
core/dnsserver/config.go
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@@ -106,6 +106,12 @@ type Config struct {
// Has no effect unless ProxyProtoUDPSessionTrackingTTL is positive.
ProxyProtoUDPSessionTrackingMaxSessions int
// ProxyProtoTLVMetadata, when true, captures the PPv2 TLV vector and exposes
// it to downstream plugins as the "proxyproto/tlv" metadata label (raw hex).
// Opt-in: off by default so existing listeners skip the extra TLV processing.
// Has no effect unless ProxyProtoConnPolicy is also set.
ProxyProtoTLVMetadata bool
// MaxGRPCStreams defines the maximum number of concurrent streams per gRPC connection.
// This is nil if not specified, allowing for a default to be used.
MaxGRPCStreams *int