mirror of
https://github.com/tailscale/tailscale.git
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37 lines
1.2 KiB
Go
37 lines
1.2 KiB
Go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package ktimeout configures kernel TCP stack timeouts via the provided
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// control functions. Platform support varies; on unsupported platforms control
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// functions may be entirely no-ops.
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package ktimeout
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import (
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"fmt"
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"syscall"
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"time"
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)
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// UserTimeout returns a control function that sets the TCP user timeout
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// (TCP_USER_TIMEOUT on linux). A user timeout specifies the maximum age of
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// unacknowledged data on the connection (either in buffer, or sent but not
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// acknowledged) before the connection is terminated. This timer has no effect
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// on limiting the lifetime of idle connections. This may be entirely local to
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// the network stack or may also apply RFC 5482 options to packets.
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func UserTimeout(timeout time.Duration) func(network, address string, c syscall.RawConn) error {
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return func(network, address string, c syscall.RawConn) error {
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switch network {
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case "tcp", "tcp4", "tcp6":
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default:
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return fmt.Errorf("ktimeout.UserTimeout: unsupported network: %s", network)
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}
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var err error
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if e := c.Control(func(fd uintptr) {
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err = SetUserTimeout(fd, timeout)
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}); e != nil {
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return e
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}
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return err
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}
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}
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