func (lc *LocalCluster) NewTap(bridge string) (*TunTap, error) {
nsExit, err := NsEnter(lc.nshandle)
if err != nil {
return nil, err
}
defer nsExit()
tap, err := AddLinkTap("")
if err != nil {
return nil, fmt.Errorf("tap failed: %v", err)
}
err = netlink.LinkSetUp(tap)
if err != nil {
return nil, fmt.Errorf("tap up failed: %v", err)
}
br, err := netlink.LinkByName(bridge)
if err != nil {
return nil, fmt.Errorf("bridge failed: %v", err)
}
err = netlink.LinkSetMaster(tap, br.(*netlink.Bridge))
if err != nil {
return nil, fmt.Errorf("set master failed: %v", err)
}
return tap, nil
}
func NewDnsmasq() (*Dnsmasq, error) {
dm := &Dnsmasq{}
for s := byte(0); s < numSegments; s++ {
seg, err := newSegment(s)
if err != nil {
return nil, fmt.Errorf("Network setup failed: %v", err)
}
dm.Segments = append(dm.Segments, seg)
}
// setup lo
lo, err := netlink.LinkByName("lo")
if err != nil {
return nil, fmt.Errorf("Network loopback setup failed: %v", err)
}
err = netlink.LinkSetUp(lo)
if err != nil {
return nil, fmt.Errorf("Network loopback setup failed: %v", err)
}
dm.dnsmasq = exec.Command("dnsmasq", "--conf-file=-")
cfg, err := dm.dnsmasq.StdinPipe()
if err != nil {
return nil, err
}
out, err := dm.dnsmasq.StdoutPipe()
if err != nil {
return nil, err
}
dm.dnsmasq.Stderr = dm.dnsmasq.Stdout
go util.LogFrom(capnslog.INFO, out)
if err = dm.dnsmasq.Start(); err != nil {
cfg.Close()
return nil, err
}
if err = configTemplate.Execute(cfg, dm); err != nil {
cfg.Close()
dm.Destroy()
return nil, err
}
cfg.Close()
return dm, nil
}
func newSegment(s byte) (*Segment, error) {
seg := &Segment{
BridgeName: fmt.Sprintf("br%d", s),
BridgeIf: newInterface(s, 1),
}
for i := byte(2); i < 2+numInterfaces; i++ {
seg.Interfaces = append(seg.Interfaces, newInterface(s, i))
}
br := netlink.Bridge{
LinkAttrs: netlink.LinkAttrs{
Name: seg.BridgeName,
HardwareAddr: seg.BridgeIf.HardwareAddr,
},
}
if err := netlink.LinkAdd(&br); err != nil {
return nil, err
}
for _, addr := range seg.BridgeIf.DHCPv4 {
nladdr := netlink.Addr{IPNet: &addr}
if err := netlink.AddrAdd(&br, &nladdr); err != nil {
return nil, err
}
}
for _, addr := range seg.BridgeIf.DHCPv6 {
nladdr := netlink.Addr{IPNet: &addr}
if err := netlink.AddrAdd(&br, &nladdr); err != nil {
return nil, err
}
}
if err := netlink.LinkSetUp(&br); err != nil {
return nil, err
}
return seg, nil
}