// CreateNetwork creates a network from intent
func CreateNetwork(network intent.ConfigNetwork, stateDriver core.StateDriver, tenantName string) error {
var extPktTag, pktTag uint
gCfg := gstate.Cfg{}
gCfg.StateDriver = stateDriver
err := gCfg.Read("")
if err != nil {
log.Errorf("error reading tenant cfg state. Error: %s", err)
return err
}
// Create network state
networkID := network.Name + "." + tenantName
nwCfg := &mastercfg.CfgNetworkState{}
nwCfg.StateDriver = stateDriver
if nwCfg.Read(networkID) == nil {
// TODO: check if parameters changed and apply an update if needed
return nil
}
subnetIP, subnetLen, _ := netutils.ParseCIDR(network.SubnetCIDR)
err = netutils.ValidateNetworkRangeParams(subnetIP, subnetLen)
if err != nil {
return err
}
ipv6Subnet, ipv6SubnetLen, _ := netutils.ParseCIDR(network.IPv6SubnetCIDR)
// construct and update network state
nwCfg = &mastercfg.CfgNetworkState{
Tenant: tenantName,
NetworkName: network.Name,
NwType: network.NwType,
PktTagType: network.PktTagType,
SubnetIP: subnetIP,
SubnetLen: subnetLen,
IPv6Subnet: ipv6Subnet,
IPv6SubnetLen: ipv6SubnetLen,
}
nwCfg.ID = networkID
nwCfg.StateDriver = stateDriver
// Allocate pkt tags
reqPktTag := uint(network.PktTag)
if nwCfg.PktTagType == "vlan" {
pktTag, err = gCfg.AllocVLAN(reqPktTag)
if err != nil {
return err
}
} else if nwCfg.PktTagType == "vxlan" {
extPktTag, pktTag, err = gCfg.AllocVXLAN(reqPktTag)
if err != nil {
return err
}
}
nwCfg.ExtPktTag = int(extPktTag)
nwCfg.PktTag = int(pktTag)
netutils.InitSubnetBitset(&nwCfg.IPAllocMap, nwCfg.SubnetLen)
subnetAddr := netutils.GetSubnetAddr(nwCfg.SubnetIP, nwCfg.SubnetLen)
nwCfg.SubnetIP = subnetAddr
nwCfg.IPAddrRange = netutils.GetIPAddrRange(subnetIP, subnetLen)
if network.Gateway != "" {
nwCfg.Gateway = network.Gateway
// Reserve gateway IP address if gateway is specified
ipAddrValue, err := netutils.GetIPNumber(subnetAddr, nwCfg.SubnetLen, 32, nwCfg.Gateway)
if err != nil {
log.Errorf("Error parsing gateway address %s. Err: %v", nwCfg.Gateway, err)
return err
}
nwCfg.IPAllocMap.Set(ipAddrValue)
}
if strings.Contains(subnetIP, "-") {
netutils.SetBitsOutsideRange(&nwCfg.IPAllocMap, subnetIP, subnetLen)
}
if network.IPv6Gateway != "" {
nwCfg.IPv6Gateway = network.IPv6Gateway
// Reserve gateway IPv6 address if gateway is specified
hostID, err := netutils.GetIPv6HostID(nwCfg.IPv6Subnet, nwCfg.IPv6SubnetLen, nwCfg.IPv6Gateway)
if err != nil {
log.Errorf("Error parsing gateway address %s. Err: %v", nwCfg.IPv6Gateway, err)
return err
}
netutils.ReserveIPv6HostID(hostID, &nwCfg.IPv6AllocMap)
}
err = nwCfg.Write()
if err != nil {
return err
}
// Skip docker and service container configs for infra nw
if network.NwType == "infra" {
return nil
}
aci, _ := IsAciConfigured()
if aci {
// Skip docker network creation for ACI fabric mode.
return nil
}
if GetClusterMode() == "docker" {
// Create the network in docker
err = docknet.CreateDockNet(tenantName, network.Name, "", nwCfg)
if err != nil {
log.Errorf("Error creating network %s in docker. Err: %v", nwCfg.ID, err)
return err
}
}
if IsDNSEnabled() {
// Attach service container endpoint to the network
err = attachServiceContainer(tenantName, network.Name, stateDriver)
if err != nil {
log.Errorf("Error attaching service container to network: %s. Err: %v",
networkID, err)
return err
}
}
return nil
}
// Allocate an address from the network
func networkAllocAddress(nwCfg *mastercfg.CfgNetworkState, reqAddr string, isIPv6 bool) (string, error) {
var ipAddress string
var ipAddrValue uint
var found bool
var err error
var hostID string
// alloc address
if reqAddr == "" {
if isIPv6 {
// Get the next available IPv6 address
hostID, err = netutils.GetNextIPv6HostID(nwCfg.IPv6LastHost, nwCfg.IPv6Subnet, nwCfg.IPv6SubnetLen, nwCfg.IPv6AllocMap)
if err != nil {
log.Errorf("create eps: error allocating ip. Error: %s", err)
return "", err
}
ipAddress, err = netutils.GetSubnetIPv6(nwCfg.IPv6Subnet, nwCfg.IPv6SubnetLen, hostID)
if err != nil {
log.Errorf("create eps: error acquiring subnet ip. Error: %s", err)
return "", err
}
nwCfg.IPv6LastHost = hostID
} else {
ipAddrValue, found = nwCfg.IPAllocMap.NextClear(0)
if !found {
log.Errorf("auto allocation failed - address exhaustion in subnet %s/%d",
nwCfg.SubnetIP, nwCfg.SubnetLen)
err = core.Errorf("auto allocation failed - address exhaustion in subnet %s/%d",
nwCfg.SubnetIP, nwCfg.SubnetLen)
return "", err
}
ipAddress, err = netutils.GetSubnetIP(nwCfg.SubnetIP, nwCfg.SubnetLen, 32, ipAddrValue)
if err != nil {
log.Errorf("create eps: error acquiring subnet ip. Error: %s", err)
return "", err
}
}
// Docker, Mesos issue a Alloc Address first, followed by a CreateEndpoint
// Kubernetes issues a create endpoint directly
// since networkAllocAddress is called from both AllocAddressHandler and CreateEndpointHandler,
// we need to make sure that the EpCount is incremented only when we are allocating
// a new IP. In case of Docker, Mesos CreateEndPoint will already request a IP that
// allocateAddress had allocated in the earlier call.
nwCfg.EpAddrCount++
} else if reqAddr != "" && nwCfg.SubnetIP != "" {
if isIPv6 {
hostID, err = netutils.GetIPv6HostID(nwCfg.IPv6Subnet, nwCfg.IPv6SubnetLen, reqAddr)
if err != nil {
log.Errorf("create eps: error getting host id from hostIP %s Subnet %s/%d. Error: %s",
reqAddr, nwCfg.IPv6Subnet, nwCfg.IPv6SubnetLen, err)
return "", err
}
} else {
ipAddrValue, err = netutils.GetIPNumber(nwCfg.SubnetIP, nwCfg.SubnetLen, 32, reqAddr)
if err != nil {
log.Errorf("create eps: error getting host id from hostIP %s Subnet %s/%d. Error: %s",
reqAddr, nwCfg.SubnetIP, nwCfg.SubnetLen, err)
return "", err
}
}
ipAddress = reqAddr
}
if isIPv6 {
netutils.ReserveIPv6HostID(hostID, &nwCfg.IPv6AllocMap)
} else {
// Set the bitmap
nwCfg.IPAllocMap.Set(ipAddrValue)
}
err = nwCfg.Write()
if err != nil {
log.Errorf("error writing nw config. Error: %s", err)
return "", err
}
return ipAddress, nil
}