kilo/pkg/wireguard/wireguard.go

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// Copyright 2019 the Kilo authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build linux
// +build linux
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package wireguard
import (
"fmt"
"github.com/vishvananda/netlink"
)
// DefaultMTU is the the default MTU used by WireGuard.
const DefaultMTU = 1420
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type wgLink struct {
a netlink.LinkAttrs
t string
}
func (w wgLink) Attrs() *netlink.LinkAttrs {
return &w.a
}
func (w wgLink) Type() string {
return w.t
}
// New returns a WireGuard interface with the given name.
// If the interface exists, its index is returned.
// Otherwise, a new interface is created.
// The function also returns a boolean to indicate if the interface was created.
func New(name string, mtu uint) (int, bool, error) {
link, err := netlink.LinkByName(name)
if err == nil {
return link.Attrs().Index, false, nil
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}
if _, ok := err.(netlink.LinkNotFoundError); !ok {
return 0, false, fmt.Errorf("failed to get links: %v", err)
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}
wl := wgLink{a: netlink.NewLinkAttrs(), t: "wireguard"}
wl.a.Name = name
wl.a.MTU = int(mtu)
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if err := netlink.LinkAdd(wl); err != nil {
return 0, false, fmt.Errorf("failed to create interface %s: %v", name, err)
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}
link, err = netlink.LinkByName(name)
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if err != nil {
return 0, false, fmt.Errorf("failed to get interface index: %v", err)
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}
return link.Attrs().Index, true, nil
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}