func (rb *HostgwBackend) Init(extIface *net.Interface, extIP net.IP, httpPort string, ipMasq bool) (*backend.SubnetDef, error) {
rb.extIface = extIface
rb.extIP = extIP
attrs := subnet.LeaseAttrs{
PublicIP: ip.FromIP(extIP),
BackendType: "host-gw",
HTTPPort: httpPort,
}
sn, err := rb.sm.AcquireLease(&attrs, rb.stop)
if err != nil {
if err == task.ErrCanceled {
return nil, err
} else {
return nil, fmt.Errorf("Failed to acquire lease: %v", err)
}
}
if ipMasq {
if err := setupIpMasq(sn, rb.sm.GetConfig().Network); err != nil {
return nil, fmt.Errorf("Failed to configure ip-masq: %v", err)
}
}
/* NB: docker will create the local route to `sn` */
return &backend.SubnetDef{
Net: sn,
MTU: extIface.MTU,
}, nil
}
/// Implementation
func parseSubnetKey(s string) (ip.IP4Net, error) {
if parts := subnetRegex.FindStringSubmatch(s); len(parts) == 3 {
snIp := net.ParseIP(parts[1]).To4()
prefixLen, err := strconv.ParseUint(parts[2], 10, 5)
if snIp != nil && err == nil {
return ip.IP4Net{IP: ip.FromIP(snIp), PrefixLen: uint(prefixLen)}, nil
}
}
return ip.IP4Net{}, errors.New("Error parsing IP Subnet")
}
func (m *UdpBackend) Init(extIface *net.Interface, extIP net.IP, httpPort string, ipMasq bool) (*backend.SubnetDef, error) {
// Parse our configuration
if len(m.rawCfg) > 0 {
if err := json.Unmarshal(m.rawCfg, &m.cfg); err != nil {
return nil, fmt.Errorf("error decoding UDP backend config: %v", err)
}
}
// Acquire the lease form subnet manager
attrs := subnet.LeaseAttrs{
PublicIP: ip.FromIP(extIP),
HTTPPort: httpPort,
}
sn, err := m.sm.AcquireLease(&attrs, m.stop)
if err != nil {
if err == task.ErrCanceled {
return nil, err
} else {
return nil, fmt.Errorf("failed to acquire lease: %v", err)
}
}
// Tunnel's subnet is that of the whole overlay network (e.g. /16)
// and not that of the individual host (e.g. /24)
m.tunNet = ip.IP4Net{
IP: sn.IP,
PrefixLen: m.sm.GetConfig().Network.PrefixLen,
}
// TUN MTU will be smaller b/c of encap (IP+UDP hdrs)
m.mtu = extIface.MTU - encapOverhead
if err = m.initTun(ipMasq); err != nil {
return nil, err
}
m.conn, err = net.ListenUDP("udp4", &net.UDPAddr{Port: m.cfg.Port})
if err != nil {
return nil, fmt.Errorf("failed to start listening on UDP socket: %v", err)
}
m.ctl, m.ctl2, err = newCtlSockets()
if err != nil {
return nil, fmt.Errorf("failed to create control socket: %v", err)
}
return &backend.SubnetDef{
Net: sn,
MTU: m.mtu,
}, nil
}
func (m *AllocBackend) Init(extIface *net.Interface, extIP net.IP, httpPort string, ipMasq bool) (*backend.SubnetDef, error) {
attrs := subnet.LeaseAttrs{
PublicIP: ip.FromIP(extIP),
HTTPPort: httpPort,
}
sn, err := m.sm.AcquireLease(&attrs, m.stop)
if err != nil {
if err == task.ErrCanceled {
return nil, err
} else {
return nil, fmt.Errorf("failed to acquire lease: %v", err)
}
}
return &backend.SubnetDef{
Net: sn,
MTU: extIface.MTU,
}, nil
}