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ipn/ipnlocal: add PROXY protocol support to Funnel/Serve

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This adds the --proxy-protocol flag to 'tailscale serve' and
'tailscale funnel', which tells the Tailscale client to prepend a PROXY
protocol[1] header when making connections to the proxied-to backend.

I've verified that this works with our existing funnel servers without
additional work, since they pass along source address information via
PeerAPI already.

Updates #7747

[1]: https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt

Change-Id: I647c24d319375c1b33e995555a541b7615d2d203
Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
This commit is contained in:
Andrew Dunham
2025-10-20 11:40:30 -04:00
parent 653d0738f9
commit 3a41c0c585
16 changed files with 217 additions and 37 deletions
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go.mod
+1
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@@ -70,6 +70,7 @@ require (
github.com/miekg/dns v1.1.58
github.com/mitchellh/go-ps v1.0.0
github.com/peterbourgon/ff/v3 v3.4.0
github.com/pires/go-proxyproto v0.8.1
github.com/pkg/errors v0.9.1
github.com/pkg/sftp v1.13.6
github.com/prometheus-community/pro-bing v0.4.0