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// Package null implements the null ipam driver. Null ipam driver satisfies ipamapi contract,
// but does not effectively reserve/allocate any address pool or address
package null
import (
"net"
"net/netip"
"github.com/docker/docker/libnetwork/ipamapi"
"github.com/docker/docker/libnetwork/types"
)
const (
// DriverName is the name of the built-in null ipam driver
DriverName = "null"
defaultAddressSpace = "null"
defaultPoolCIDR = "0.0.0.0/0"
defaultPoolID = defaultAddressSpace + "/" + defaultPoolCIDR
)
var defaultPool = netip.MustParsePrefix(defaultPoolCIDR)
type allocator struct{}
func (a *allocator) GetDefaultAddressSpaces() (string, string, error) {
return defaultAddressSpace, defaultAddressSpace, nil
}
func (a *allocator) RequestPool(req ipamapi.PoolRequest) (ipamapi.AllocatedPool, error) {
if req.AddressSpace != defaultAddressSpace {
return ipamapi.AllocatedPool{}, types.InvalidParameterErrorf("unknown address space: %s", req.AddressSpace)
}
if req.Pool != "" {
return ipamapi.AllocatedPool{}, types.InvalidParameterErrorf("null ipam driver does not handle specific address pool requests")
}
if req.SubPool != "" {
return ipamapi.AllocatedPool{}, types.InvalidParameterErrorf("null ipam driver does not handle specific address subpool requests")
}
if req.V6 {
return ipamapi.AllocatedPool{}, types.InvalidParameterErrorf("null ipam driver does not handle IPv6 address pool requests")
}
return ipamapi.AllocatedPool{
PoolID: defaultPoolID,
Pool: defaultPool,
}, nil
}
func (a *allocator) ReleasePool(poolID string) error {
return nil
}
func (a *allocator) RequestAddress(poolID string, ip net.IP, opts map[string]string) (*net.IPNet, map[string]string, error) {
if poolID != defaultPoolID {
return nil, nil, types.InvalidParameterErrorf("unknown pool id: %s", poolID)
}
return nil, nil, nil
}
func (a *allocator) ReleaseAddress(poolID string, ip net.IP) error {
if poolID != defaultPoolID {
return types.InvalidParameterErrorf("unknown pool id: %s", poolID)
}
return nil
}
func (a *allocator) IsBuiltIn() bool {
return true
}
// Register registers the null ipam driver with r.
func Register(r ipamapi.Registerer) error {
return r.RegisterIpamDriver(DriverName, &allocator{})
}
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