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route.go
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route.go
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// Copyright 2016-2018 Authors of Cilium
//
// 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.
package route
import (
"fmt"
"net"
"github.com/cilium/cilium/pkg/logging/logfields"
"github.com/cilium/cilium/pkg/option"
"github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
)
type Route struct {
Prefix net.IPNet
Nexthop *net.IP
Local net.IP
Device string
MTU int
Proto int
Scope netlink.Scope
Table int
Type int
}
// LogFields returns the route attributes as logrus.Fields map
func (r *Route) LogFields() logrus.Fields {
return logrus.Fields{
"prefix": r.Prefix,
"nexthop": r.Nexthop,
"local": r.Local,
logfields.Interface: r.Device,
}
}
func (r *Route) getLogger() *logrus.Entry {
return log.WithFields(r.LogFields())
}
// ByMask is used to sort an array of routes by mask, narrow first.
type ByMask []Route
func (a ByMask) Len() int {
return len(a)
}
func (a ByMask) Less(i, j int) bool {
lenA, _ := a[i].Prefix.Mask.Size()
lenB, _ := a[j].Prefix.Mask.Size()
return lenA > lenB
}
func (a ByMask) Swap(i, j int) {
a[i], a[j] = a[j], a[i]
}
// ToIPCommand converts the route into a full "ip route ..." command
func (r *Route) ToIPCommand(dev string) []string {
res := []string{"ip"}
if r.Prefix.IP.To4() == nil {
res = append(res, "-6")
}
res = append(res, "route", "add", r.Prefix.String())
if r.Nexthop != nil {
res = append(res, "via", r.Nexthop.String())
}
if r.MTU != 0 {
res = append(res, "mtu", fmt.Sprintf("%d", r.MTU))
}
res = append(res, "dev", dev)
return res
}
func lookupDefaultRoute(family int) (netlink.Route, error) {
linkIndex := 0
routes, err := netlink.RouteListFiltered(family, &netlink.Route{Dst: nil}, netlink.RT_FILTER_DST)
if err != nil {
return netlink.Route{}, fmt.Errorf("Unable to list direct routes: %s", err)
}
if len(routes) == 0 {
return netlink.Route{}, fmt.Errorf("Default route not found for family %d", family)
}
for _, route := range routes {
if linkIndex != 0 && linkIndex != route.LinkIndex {
return netlink.Route{}, fmt.Errorf("Found default routes with different netdev ifindices: %v vs %v",
linkIndex, route.LinkIndex)
}
linkIndex = route.LinkIndex
}
log.Debugf("Found default route on node %v", routes[0])
return routes[0], nil
}
// NodeDeviceWithDefaultRoute returns the node's device which handles the
// default route in the current namespace
func NodeDeviceWithDefaultRoute() (netlink.Link, error) {
linkIndex := 0
if option.Config.EnableIPv4 {
route, err := lookupDefaultRoute(netlink.FAMILY_V4)
if err != nil {
return nil, err
}
linkIndex = route.LinkIndex
}
if option.Config.EnableIPv6 {
route, err := lookupDefaultRoute(netlink.FAMILY_V6)
if err != nil {
return nil, err
}
if linkIndex != 0 && linkIndex != route.LinkIndex {
return nil, fmt.Errorf("IPv4/IPv6 have different link indices")
}
linkIndex = route.LinkIndex
}
link, err := netlink.LinkByIndex(linkIndex)
if err != nil {
return nil, err
}
return link, nil
}