func (rb *HostgwBackend) checkSubnetExistInRoutes() {
routeList, err := netlink.RouteList(nil, netlink.FAMILY_V4)
if err == nil {
for _, route := range rb.rl {
exist := false
for _, r := range routeList {
if r.Dst == nil {
continue
}
if routeEqual(r, route) {
exist = true
break
}
}
if !exist {
if err := netlink.RouteAdd(&route); err != nil {
if nerr, ok := err.(net.Error); !ok {
log.Errorf("Error recovering route to %v: %v, %v", route.Dst, route.Gw, nerr)
}
continue
} else {
log.Infof("Route recovered %v : %v", route.Dst, route.Gw)
}
}
}
}
}
func configureIface(ifname string, ipn ip.IP4Net, mtu int) error {
iface, err := netlink.LinkByName(ifname)
if err != nil {
return fmt.Errorf("failed to lookup interface %v", ifname)
}
err = netlink.AddrAdd(iface, &netlink.Addr{ipn.ToIPNet(), ""})
if err != nil {
return fmt.Errorf("failed to add IP address %v to %v: %v", ipn.String(), ifname, err)
}
err = netlink.LinkSetMTU(iface, mtu)
if err != nil {
return fmt.Errorf("failed to set MTU for %v: %v", ifname, err)
}
err = netlink.LinkSetUp(iface)
if err != nil {
return fmt.Errorf("failed to set interface %v to UP state: %v", ifname, err)
}
// explicitly add a route since there might be a route for a subnet already
// installed by Docker and then it won't get auto added
err = netlink.RouteAdd(&netlink.Route{
LinkIndex: iface.Attrs().Index,
Scope: netlink.SCOPE_UNIVERSE,
Dst: ipn.Network().ToIPNet(),
})
if err != nil && err != syscall.EEXIST {
return fmt.Errorf("Failed to add route (%v -> %v): %v", ipn.Network().String(), ifname, err)
}
return nil
}
func (rb *HostgwBackend) handleSubnetEvents(batch []subnet.Event) {
for _, evt := range batch {
switch evt.Type {
case subnet.SubnetAdded:
log.Infof("Subnet added: %v via %v", evt.Lease.Subnet, evt.Lease.Attrs.PublicIP)
if evt.Lease.Attrs.BackendType != "host-gw" {
log.Warningf("Ignoring non-host-gw subnet: type=%v", evt.Lease.Attrs.BackendType)
continue
}
route := netlink.Route{
Dst: evt.Lease.Subnet.ToIPNet(),
Gw: evt.Lease.Attrs.PublicIP.ToIP(),
LinkIndex: rb.extIface.Index,
}
if rb.extIaddr.Equal(route.Gw) {
continue
}
if err := netlink.RouteAdd(&route); err != nil {
log.Errorf("Error adding route to %v via %v: %v", evt.Lease.Subnet, evt.Lease.Attrs.PublicIP, err)
continue
}
rb.addToRouteList(route)
case subnet.SubnetRemoved:
log.Info("Subnet removed: ", evt.Lease.Subnet)
if evt.Lease.Attrs.BackendType != "host-gw" {
log.Warningf("Ignoring non-host-gw subnet: type=%v", evt.Lease.Attrs.BackendType)
continue
}
route := netlink.Route{
Dst: evt.Lease.Subnet.ToIPNet(),
Gw: evt.Lease.Attrs.PublicIP.ToIP(),
LinkIndex: rb.extIface.Index,
}
if err := netlink.RouteDel(&route); err != nil {
log.Errorf("Error deleting route to %v: %v", evt.Lease.Subnet, err)
continue
}
rb.removeFromRouteList(route)
default:
log.Error("Internal error: unknown event type: ", int(evt.Type))
}
}
}
func (dev *vxlanDevice) Configure(ipn ip.IP4Net) error {
setAddr4(dev.link, ipn.ToIPNet())
if err := netlink.LinkSetUp(dev.link); err != nil {
return fmt.Errorf("failed to set interface %s to UP state: %s", dev.link.Attrs().Name, err)
}
// explicitly add a route since there might be a route for a subnet already
// installed by Docker and then it won't get auto added
route := netlink.Route{
LinkIndex: dev.link.Attrs().Index,
Scope: netlink.SCOPE_UNIVERSE,
Dst: ipn.Network().ToIPNet(),
}
if err := netlink.RouteAdd(&route); err != nil && err != syscall.EEXIST {
return fmt.Errorf("failed to add route (%s -> %s): %v", ipn.Network().String(), dev.link.Attrs().Name, err)
}
return nil
}