func (rb *HostgwBackend) handleSubnetEvents(batch subnet.EventBatch) {
for _, evt := range batch {
switch evt.Type {
case subnet.SubnetAdded:
log.Infof("Subnet added: %v via %v", evt.Lease.Network, 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.Network.ToIPNet(),
Gw: evt.Lease.Attrs.PublicIP.ToIP(),
LinkIndex: rb.extIface.Index,
}
if err := netlink.RouteAdd(&route); err != nil {
log.Errorf("Error adding route to %v via %v: %v", evt.Lease.Network, evt.Lease.Attrs.PublicIP, err)
continue
}
case subnet.SubnetRemoved:
log.Info("Subnet removed: ", evt.Lease.Network)
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.Network.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.Network, err)
continue
}
default:
log.Error("Internal error: unknown event type: ", int(evt.Type))
}
}
}
func (ipt *IPTables) Exists(table string, args ...string) (bool, error) {
checkPresent, err := getIptablesHasCheckCommand()
if err != nil {
log.Warningf("Error checking iptables version, assuming version at least 1.4.11: %v\n", err)
checkPresent = true
}
if !checkPresent {
cmd := append([]string{"-A"}, args...)
return existsForOldIpTables(table, strings.Join(cmd, " "))
} else {
cmd := append([]string{"-t", table, "-C"}, args...)
err = exec.Command(ipt.path, cmd...).Run()
}
switch {
case err == nil:
return true, nil
case err.(*exec.ExitError).Sys().(syscall.WaitStatus).ExitStatus() == 1:
return false, nil
default:
return false, err
}
}