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https://github.com/tailscale/tailscale.git
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James Tucker
2249be1ac8
Add --tcp-save-syn on Linux to record client MSS in a Prometheus histogram. Count retrieval outcomes separately and limit saved-SYN error logs to one per ten minutes across clients. IPv6 extension headers are unsupported. Estimate the network-namespace SYN rate from kernel counters once per second. Disable TCP_SAVE_SYN on listeners above 100,000/s or if rate measurement fails, leaving it off until restart. Updates tailscale/corp#49139 Signed-off-by: James Tucker <james@tailscale.com>
18 lines
363 B
Go
18 lines
363 B
Go
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !linux || android
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package derpserver
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import "context"
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func (c *sclient) startStatsLoop(ctx context.Context) {
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// Nothing to do
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return
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}
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// recordSavedSyn is a no-op on non-Linux platforms; TCP_SAVE_SYN is
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// Linux-only.
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func (c *sclient) recordSavedSyn() {}
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