func InitDriver(job *engine.Job) engine.Status {
var (
network *net.IPNet
enableIPTables = job.GetenvBool("EnableIptables")
icc = job.GetenvBool("InterContainerCommunication")
ipForward = job.GetenvBool("EnableIpForward")
bridgeIP = job.Getenv("BridgeIP")
)
if defaultIP := job.Getenv("DefaultBindingIP"); defaultIP != "" {
defaultBindingIP = net.ParseIP(defaultIP)
}
bridgeIface = job.Getenv("BridgeIface")
if bridgeIface == "" {
bridgeIface = DefaultNetworkBridge
}
addr, err := networkdriver.GetIfaceAddr(bridgeIface)
if err != nil {
// If the iface is not found, try to create it
job.Logf("creating new bridge for %s", bridgeIface)
if err := createBridge(bridgeIP); err != nil {
job.Error(err)
return engine.StatusErr
}
job.Logf("getting iface addr")
addr, err = networkdriver.GetIfaceAddr(bridgeIface)
if err != nil {
job.Error(err)
return engine.StatusErr
}
network = addr.(*net.IPNet)
} else {
network = addr.(*net.IPNet)
}
// Configure iptables for link support
if enableIPTables {
if err := setupIPTables(addr, icc); err != nil {
job.Error(err)
return engine.StatusErr
}
}
if ipForward {
// Enable IPv4 forwarding
if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte{'1', '\n'}, 0644); err != nil {
job.Logf("WARNING: unable to enable IPv4 forwarding: %s\n", err)
}
}
// We can always try removing the iptables
if err := iptables.RemoveExistingChain("DOCKER"); err != nil {
job.Error(err)
return engine.StatusErr
}
if enableIPTables {
chain, err := iptables.NewChain("DOCKER", bridgeIface)
if err != nil {
job.Error(err)
return engine.StatusErr
}
portmapper.SetIptablesChain(chain)
}
bridgeNetwork = network
// https://github.com/Nerdness/docker/issues/2768
job.Eng.Hack_SetGlobalVar("httpapi.bridgeIP", bridgeNetwork.IP)
for name, f := range map[string]engine.Handler{
"allocate_interface": Allocate,
"release_interface": Release,
"allocate_port": AllocatePort,
"link": LinkContainers,
} {
if err := job.Eng.Register(name, f); err != nil {
job.Error(err)
return engine.StatusErr
}
}
return engine.StatusOK
}