Fixes #3933. Signed-off-by: Dmytro Shynkevych <dm.shynk@gmail.com>main
Dmytro Shynkevych
4 years ago
committed by
Brad Fitzpatrick
parent
5d085a6f41
commit
d9a7205be5
@ -0,0 +1,64 @@ |
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tstun |
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import ( |
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"github.com/mdlayher/genetlink" |
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"github.com/mdlayher/netlink" |
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"golang.org/x/sys/unix" |
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"golang.zx2c4.com/wireguard/tun" |
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) |
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// setLinkSpeed sets the advertised link speed of the TUN interface.
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func setLinkSpeed(iface tun.Device, mbps int) error { |
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name, err := iface.Name() |
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if err != nil { |
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return err |
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} |
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conn, err := genetlink.Dial(&netlink.Config{Strict: true}) |
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if err != nil { |
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return err |
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} |
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defer conn.Close() |
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f, err := conn.GetFamily(unix.ETHTOOL_GENL_NAME) |
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if err != nil { |
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return err |
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} |
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ae := netlink.NewAttributeEncoder() |
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ae.Nested(unix.ETHTOOL_A_LINKMODES_HEADER, func(nae *netlink.AttributeEncoder) error { |
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nae.String(unix.ETHTOOL_A_HEADER_DEV_NAME, name) |
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return nil |
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}) |
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ae.Uint32(unix.ETHTOOL_A_LINKMODES_SPEED, uint32(mbps)) |
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b, err := ae.Encode() |
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if err != nil { |
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return err |
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} |
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_, err = conn.Execute( |
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genetlink.Message{ |
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Header: genetlink.Header{ |
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Command: unix.ETHTOOL_MSG_LINKMODES_SET, |
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Version: unix.ETHTOOL_GENL_VERSION, |
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}, |
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Data: b, |
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}, |
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f.ID, |
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netlink.Request|netlink.Acknowledge, |
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) |
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return err |
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} |
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// setLinkAttrs sets up link attributes that can be queried by external tools.
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// Its failure is non-fatal to interface bringup.
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func setLinkAttrs(iface tun.Device) error { |
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// By default the link speed is 10Mbps, which is easily exceeded and causes monitoring tools to complain (#3933).
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return setLinkSpeed(iface, unix.SPEED_UNKNOWN) |
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} |
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@ -0,0 +1,14 @@ |
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build !linux
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// +build !linux
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package tstun |
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import "golang.zx2c4.com/wireguard/tun" |
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func setLinkAttrs(iface tun.Device) error { |
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return nil |
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} |
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