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pkg/wireguard: allow configuring MTU (#215)

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This commit makes it possible to configure the MTU for the WireGuard
interface created by Kilo.

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit is contained in:
Lucas Servén Marín 2021-07-16 14:23:11 +02:00 committed by GitHub
parent daecc2a0bc
commit 2c74a560c4
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 10 additions and 4 deletions
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4
cmd/kg/main.go
View File

@ -40,6 +40,7 @@ import (
kiloclient "github.com/squat/kilo/pkg/k8s/clientset/versioned"
"github.com/squat/kilo/pkg/mesh"
"github.com/squat/kilo/pkg/version"
"github.com/squat/kilo/pkg/wireguard"
)
const (
@ -94,6 +95,7 @@ func Main() error {
local := flag.Bool("local", true, "Should Kilo manage routes within a location?")
logLevel := flag.String("log-level", logLevelInfo, fmt.Sprintf("Log level to use. Possible values: %s", availableLogLevels))
master := flag.String("master", "", "The address of the Kubernetes API server (overrides any value in kubeconfig).")
mtu := flag.Uint("mtu", wireguard.DefaultMTU, "The MTU of the WireGuard interface created by Kilo.")
topologyLabel := flag.String("topology-label", k8s.RegionLabelKey, "Kubernetes node label used to group nodes into logical locations.")
var port uint
flag.UintVar(&port, "port", mesh.DefaultKiloPort, "The port over which WireGuard peers should communicate.")
@ -180,7 +182,7 @@ func Main() error {
return fmt.Errorf("backend %v unknown; possible values are: %s", *backend, availableBackends)
}
m, err := mesh.New(b, enc, gr, *hostname, uint32(port), s, *local, *cni, *cniPath, *iface, *cleanUpIface, *createIface, *resyncPeriod, log.With(logger, "component", "kilo"))
m, err := mesh.New(b, enc, gr, *hostname, uint32(port), s, *local, *cni, *cniPath, *iface, *cleanUpIface, *createIface, *mtu, *resyncPeriod, log.With(logger, "component", "kilo"))
if err != nil {
return fmt.Errorf("failed to create Kilo mesh: %v", err)
}

4
pkg/mesh/mesh.go
View File

@ -86,7 +86,7 @@ type Mesh struct {
}
// New returns a new Mesh instance.
func New(backend Backend, enc encapsulation.Encapsulator, granularity Granularity, hostname string, port uint32, subnet *net.IPNet, local, cni bool, cniPath, iface string, cleanUpIface bool, createIface bool, resyncPeriod time.Duration, logger log.Logger) (*Mesh, error) {
func New(backend Backend, enc encapsulation.Encapsulator, granularity Granularity, hostname string, port uint32, subnet *net.IPNet, local, cni bool, cniPath, iface string, cleanUpIface bool, createIface bool, mtu uint, resyncPeriod time.Duration, logger log.Logger) (*Mesh, error) {
if err := os.MkdirAll(kiloPath, 0700); err != nil {
return nil, fmt.Errorf("failed to create directory to store configuration: %v", err)
}
@ -111,7 +111,7 @@ func New(backend Backend, enc encapsulation.Encapsulator, granularity Granularit
}
var kiloIface int
if createIface {
kiloIface, _, err = wireguard.New(iface)
kiloIface, _, err = wireguard.New(iface, mtu)
if err != nil {
return nil, fmt.Errorf("failed to create WireGuard interface: %v", err)
}

6
pkg/wireguard/wireguard.go
View File

@ -24,6 +24,9 @@ import (
"github.com/vishvananda/netlink"
)
// DefaultMTU is the the default MTU used by WireGuard.
const DefaultMTU = 1420
type wgLink struct {
a netlink.LinkAttrs
t string
@ -41,7 +44,7 @@ func (w wgLink) Type() string {
// 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) (int, bool, error) {
func New(name string, mtu uint) (int, bool, error) {
link, err := netlink.LinkByName(name)
if err == nil {
return link.Attrs().Index, false, nil
@ -51,6 +54,7 @@ func New(name string) (int, bool, error) {
}
wl := wgLink{a: netlink.NewLinkAttrs(), t: "wireguard"}
wl.a.Name = name
wl.a.MTU = int(mtu)
if err := netlink.LinkAdd(wl); err != nil {
return 0, false, fmt.Errorf("failed to create interface %s: %v", name, err)
}