Add libnetwork ipam implementation
Signed-off-by: Alessandro Boch <aboch@docker.com>
This commit is contained in:
Alessandro Boch
parent
3287a4c830
commit
873ea8a224
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package ipam
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import (
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"fmt"
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"net"
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"github.com/docker/libnetwork/bitseq"
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)
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const (
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// The biggest configurable host subnets
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minNetSize = 8
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minNetSizeV6 = 64
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// The effective network size for v6
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minNetSizeV6Eff = 96
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// The size of the host subnet used internally, it's the most granular sequence addresses
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defaultInternalHostSize = 16
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)
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// Allocator provides per address space ipv4/ipv6 book keeping
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type Allocator struct {
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// The internal subnets host size
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internalHostSize int
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// Static subnet information
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subnetsInfo map[subnetKey]*subnetData
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// Allocated addresses in each address space's internal subnet
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addresses map[isKey]*bitmask
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}
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// NewAllocator returns an instance of libnetwork ipam
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func NewAllocator() *Allocator {
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a := &Allocator{}
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a.subnetsInfo = make(map[subnetKey]*subnetData)
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a.addresses = make(map[isKey]*bitmask)
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a.internalHostSize = defaultInternalHostSize
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return a
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}
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// Pointer to the configured subnets in each address space
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type subnetKey struct {
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addressSpace AddressSpace
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subnet string
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}
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// Pointer to the internal subnets in each address space
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type isKey subnetKey
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// The structs contains the configured subnet information
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// along with the pointers to the respective internal subnets
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type subnetData struct {
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info *SubnetInfo // Configured subnet
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intSubKeyes []*isKey // Pointers to child internal subnets
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}
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// The structs containing the address allocation bitmask for the internal subnet.
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// The bitmask is stored a run-length encoded seq.Sequence of 4 bytes blcoks.
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type bitmask struct {
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subnet *net.IPNet
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addressMask *bitseq.Sequence
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freeAddresses int
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}
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type ipVersion int
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const (
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v4 = 4
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v6 = 6
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)
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/*******************
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* IPAMConf Contract
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********************/
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// AddSubnet adds a subnet for the specified address space
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func (a *Allocator) AddSubnet(addrSpace AddressSpace, subnetInfo *SubnetInfo) error {
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// Sanity check
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if addrSpace == "" {
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return ErrInvalidAddressSpace
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}
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if subnetInfo == nil || subnetInfo.Subnet == nil {
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return ErrInvalidSubnet
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}
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if a.contains(addrSpace, subnetInfo) {
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return ErrOverlapSubnet
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}
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// Sanity check and size adjustment for v6
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subnetToSplit, err := adjustAndCheckSubnetSize(subnetInfo.Subnet)
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if err != nil {
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return err
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}
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// Convert to smaller internal subnets (if needed)
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subnetList, err := getInternalSubnets(subnetToSplit, a.internalHostSize)
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if err != nil {
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return err
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}
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// Store the configured subnet information
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subnetKey := subnetKey{addrSpace, subnetInfo.Subnet.String()}
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info := &subnetData{info: subnetInfo, intSubKeyes: make([]*isKey, len(subnetList))}
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a.subnetsInfo[subnetKey] = info
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// Create and insert the internal subnet(s) addresses masks into the address database
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for i, sub := range subnetList {
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ones, bits := sub.Mask.Size()
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numAddresses := 1 << uint(bits-ones)
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// Create and store internal subnet key into parent subnet handle
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smallKey := &isKey{addrSpace, sub.String()}
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info.intSubKeyes[i] = smallKey
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// Add the new address masks
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a.addresses[*smallKey] = &bitmask{
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subnet: sub,
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addressMask: bitseq.New(uint32(numAddresses)),
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freeAddresses: numAddresses,
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}
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}
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return nil
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}
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// Check subnets size. In case configured subnet is v6 and host size is
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// greater than 32 bits, adjust subnet to /96.
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func adjustAndCheckSubnetSize(subnet *net.IPNet) (*net.IPNet, error) {
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ones, bits := subnet.Mask.Size()
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if v6 == getAddressVersion(subnet.IP) {
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if ones < minNetSizeV6 {
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return nil, ErrInvalidSubnet
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}
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if ones < minNetSizeV6Eff {
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newMask := net.CIDRMask(minNetSizeV6Eff, bits)
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return &net.IPNet{IP: subnet.IP, Mask: newMask}, nil
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}
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} else {
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if ones < minNetSize {
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return nil, ErrInvalidSubnet
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}
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}
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return subnet, nil
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}
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// Checks whether the passed subnet is a superset or subset of any of the subset in the db
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func (a *Allocator) contains(space AddressSpace, subInfo *SubnetInfo) bool {
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for k, v := range a.subnetsInfo {
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if space == k.addressSpace {
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if subInfo.Subnet.Contains(v.info.Subnet.IP) ||
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v.info.Subnet.Contains(subInfo.Subnet.IP) {
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return true
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}
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}
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}
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return false
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}
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// Splits the passed subnet into N internal subnets with host size equal to internalHostSize.
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// If the subnet's host size is equal to or smaller than internalHostSize, there won't be any
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// split and the return list will contain only the passed subnet.
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func getInternalSubnets(subnet *net.IPNet, internalHostSize int) ([]*net.IPNet, error) {
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var subnetList []*net.IPNet
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// Get network/host subnet information
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netBits, bits := subnet.Mask.Size()
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hostBits := bits - netBits
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extraBits := hostBits - internalHostSize
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if extraBits <= 0 {
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subnetList = make([]*net.IPNet, 1)
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subnetList[0] = subnet
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} else {
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// Split in smaller internal subnets
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numIntSubs := 1 << uint(extraBits)
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subnetList = make([]*net.IPNet, numIntSubs)
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// Construct one copy of the internal subnets's mask
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intNetBits := bits - internalHostSize
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intMask := net.CIDRMask(intNetBits, bits)
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// Construct the prefix portion for each internal subnet
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for i := 0; i < numIntSubs; i++ {
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intIP := make([]byte, len(subnet.IP))
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copy(intIP, subnet.IP) // IPv6 is too big, just work on the extra portion
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addIntToIP(intIP, i<<uint(internalHostSize))
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subnetList[i] = &net.IPNet{IP: intIP, Mask: intMask}
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}
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}
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return subnetList, nil
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}
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// RemoveSubnet removes the subnet from the specified address space
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func (a *Allocator) RemoveSubnet(addrSpace AddressSpace, subnet *net.IPNet) error {
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if addrSpace == "" {
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return ErrInvalidAddressSpace
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}
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if subnet == nil {
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return ErrInvalidSubnet
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}
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// Look for the respective subnet configuration data
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// Remove it along with the internal subnets
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subKey := subnetKey{addrSpace, subnet.String()}
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subData, ok := a.subnetsInfo[subKey]
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if !ok {
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return ErrSubnetNotFound
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}
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for _, key := range subData.intSubKeyes {
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delete(a.addresses, *key)
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}
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delete(a.subnetsInfo, subKey)
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return nil
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}
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// AddVendorInfo adds vendor specific data
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func (a *Allocator) AddVendorInfo([]byte) error {
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// no op for us
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return nil
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}
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/****************
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* IPAM Contract
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****************/
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// Request allows requesting an IPv4 address from the specified address space
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func (a *Allocator) Request(addrSpace AddressSpace, req *AddressRequest) (*AddressResponse, error) {
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return a.request(addrSpace, req, v4)
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}
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// RequestV6 requesting an IPv6 address from the specified address space
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func (a *Allocator) RequestV6(addrSpace AddressSpace, req *AddressRequest) (*AddressResponse, error) {
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return a.request(addrSpace, req, v6)
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}
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func (a *Allocator) request(addrSpace AddressSpace, req *AddressRequest, version ipVersion) (*AddressResponse, error) {
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// Empty response
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response := &AddressResponse{}
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// Sanity check
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if addrSpace == "" {
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return response, ErrInvalidAddressSpace
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}
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// Validate request
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if err := req.Validate(); err != nil {
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return response, err
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}
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// Check ip version congruence
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if &req.Subnet != nil && version != getAddressVersion(req.Subnet.IP) {
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return response, ErrInvalidRequest
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}
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// Look for an address
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ip, _, err := a.reserveAddress(addrSpace, &req.Subnet, req.Address, version)
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if err == nil {
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// Populate response
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response.Address = ip
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response.Subnet = *a.subnetsInfo[subnetKey{addrSpace, req.Subnet.String()}].info
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}
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return response, err
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}
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// Release allows releasing the address from the specified address space
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func (a *Allocator) Release(addrSpace AddressSpace, address net.IP) {
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if address == nil {
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return
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}
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ver := getAddressVersion(address)
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if ver == v4 {
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address = address.To4()
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}
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for _, subKey := range a.getSubnetList(addrSpace, ver) {
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sub := a.addresses[*subKey].subnet
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if sub.Contains(address) {
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// Retrieve correspondent ordinal in the subnet
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space := a.addresses[isKey{addrSpace, sub.String()}]
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ordinal := ipToInt(getHostPortionIP(address, space.subnet))
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// Release it
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space.addressMask = bitseq.PushReservation(ordinal/8, ordinal%8, space.addressMask, true)
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space.freeAddresses++
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return
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}
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}
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}
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func (a *Allocator) reserveAddress(addrSpace AddressSpace, subnet *net.IPNet, prefAddress net.IP, ver ipVersion) (net.IP, *net.IPNet, error) {
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var keyList []*isKey
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// Get the list of pointers to the internal subnets
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if subnet != nil {
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keyList = a.subnetsInfo[subnetKey{addrSpace, subnet.String()}].intSubKeyes
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} else {
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keyList = a.getSubnetList(addrSpace, ver)
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}
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if len(keyList) == 0 {
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return nil, nil, ErrNoAvailableSubnet
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}
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for _, key := range keyList {
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smallSubnet := a.addresses[*key]
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address, err := a.getAddress(smallSubnet, prefAddress, ver)
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if err == nil {
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return address, subnet, nil
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}
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}
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return nil, nil, ErrNoAvailableIPs
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}
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// Get the list of available internal subnets for the specified address space and the desired ip version
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func (a *Allocator) getSubnetList(addrSpace AddressSpace, ver ipVersion) []*isKey {
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var list [1024]*isKey
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ind := 0
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for subKey := range a.addresses {
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_, s, _ := net.ParseCIDR(subKey.subnet)
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subVer := getAddressVersion(s.IP)
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if subKey.addressSpace == addrSpace && subVer == ver {
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list[ind] = &subKey
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ind++
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}
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}
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return list[0:ind]
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}
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func (a *Allocator) getAddress(smallSubnet *bitmask, prefAddress net.IP, ver ipVersion) (net.IP, error) {
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var (
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bytePos, bitPos int
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)
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// Look for free IP, skip .0 and .255, they will be automatically reserved
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again:
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if smallSubnet.freeAddresses <= 0 {
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return nil, ErrNoAvailableIPs
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}
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if prefAddress == nil {
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bytePos, bitPos = bitseq.GetFirstAvailable(smallSubnet.addressMask)
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} else {
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ordinal := ipToInt(getHostPortionIP(prefAddress, smallSubnet.subnet))
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bytePos, bitPos = bitseq.CheckIfAvailable(smallSubnet.addressMask, ordinal)
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}
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if bytePos == -1 {
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return nil, ErrNoAvailableIPs
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}
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// Lock it
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smallSubnet.addressMask = bitseq.PushReservation(bytePos, bitPos, smallSubnet.addressMask, false)
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smallSubnet.freeAddresses--
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// Build IP ordinal
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ordinal := bitPos + bytePos*8
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// For v4, let reservation of .0 and .255 happen automatically
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if ver == v4 && !isValidIP(ordinal) {
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goto again
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}
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// Convert IP ordinal for this subnet into IP address
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return generateAddress(ordinal, smallSubnet.subnet), nil
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}
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// DumpDatabase dumps the internal info
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func (a *Allocator) DumpDatabase() {
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for _, config := range a.subnetsInfo {
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fmt.Printf("\n\n%s:", config.info.Subnet.String())
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for _, internKey := range config.intSubKeyes {
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bm := a.addresses[*internKey]
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fmt.Printf("\n\t%s: %s\n\t%d", bm.subnet, bm.addressMask, bm.freeAddresses)
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}
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}
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}
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// It generates the ip address in the passed subnet specified by
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// the passed host address ordinal
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func generateAddress(ordinal int, network *net.IPNet) net.IP {
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var address [16]byte
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// Get network portion of IP
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if network.IP.To4() != nil {
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copy(address[:], network.IP.To4())
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} else {
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copy(address[:], network.IP)
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}
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end := len(network.Mask)
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addIntToIP(address[:end], ordinal)
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return net.IP(address[:end])
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}
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func getAddressVersion(ip net.IP) ipVersion {
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if ip.To4() == nil {
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return v6
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}
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return v4
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}
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// .0 and .255 will return false
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func isValidIP(i int) bool {
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lastByte := i & 0xff
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return lastByte != 0xff && lastByte != 0
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}
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// Adds the ordinal IP to the current array
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// 192.168.0.0 + 53 => 192.168.53
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func addIntToIP(array []byte, ordinal int) {
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for i := len(array) - 1; i >= 0; i-- {
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array[i] |= (byte)(ordinal & 0xff)
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ordinal >>= 8
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}
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}
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// Convert an ordinal to the respective IP address
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func ipToInt(ip []byte) int {
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value := 0
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for i := 0; i < len(ip); i++ {
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j := len(ip) - 1 - i
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value += int(ip[i]) << uint(j*8)
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}
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return value
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}
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// Given an address and subnet, returns the host portion address
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func getHostPortionIP(address net.IP, subnet *net.IPNet) net.IP {
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hostPortion := make([]byte, len(address))
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for i := 0; i < len(subnet.Mask); i++ {
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hostPortion[i] = address[i] &^ subnet.Mask[i]
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}
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return hostPortion
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}
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func printLine(head *bitseq.Sequence) {
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fmt.Println()
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for head != nil {
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fmt.Printf("-")
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head = head.Next
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}
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}
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@ -0,0 +1,543 @@
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package ipam
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import (
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"fmt"
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"net"
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"testing"
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"time"
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"github.com/docker/libnetwork/bitseq"
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)
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func getAllocator(subnet *net.IPNet) *Allocator {
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a := NewAllocator()
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a.AddSubnet("default", &SubnetInfo{Subnet: subnet})
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return a
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}
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func TestInt2IP2IntConversion(t *testing.T) {
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for i := 0; i < 256*256*256; i++ {
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var array [4]byte // new array at each cycle
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addIntToIP(array[:], i)
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j := ipToInt(array[:])
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if j != i {
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t.Fatalf("Failed to convert ordinal %d to IP % x and back to ordinal. Got %d", i, array, j)
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}
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}
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}
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func TestIsValid(t *testing.T) {
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list := []int{0, 255, 256, 511, 512, 767, 768}
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for _, i := range list {
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if isValidIP(i) {
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t.Fatalf("Failed to detect invalid IPv4 ordinal: %d", i)
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}
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}
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list = []int{1, 254, 257, 258, 510, 513, 769, 770}
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for _, i := range list {
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if !isValidIP(i) {
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t.Fatalf("Marked valid ipv4 as invalid: %d", i)
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}
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}
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}
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func TestGetAddressVersion(t *testing.T) {
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if v4 != getAddressVersion(net.ParseIP("172.28.30.112")) {
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t.Fatalf("Failed to detect IPv4 version")
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}
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if v4 != getAddressVersion(net.ParseIP("0.0.0.1")) {
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t.Fatalf("Failed to detect IPv4 version")
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}
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if v6 != getAddressVersion(net.ParseIP("ff01::1")) {
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t.Fatalf("Failed to detect IPv6 version")
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}
|
||||
if v6 != getAddressVersion(net.ParseIP("2001:56::76:51")) {
|
||||
t.Fatalf("Failed to detect IPv6 version")
|
||||
}
|
||||
}
|
||||
|
||||
func TestAddSubnets(t *testing.T) {
|
||||
a := NewAllocator()
|
||||
|
||||
_, sub0, _ := net.ParseCIDR("10.0.0.0/8")
|
||||
err := a.AddSubnet("default", &SubnetInfo{Subnet: sub0})
|
||||
if err != nil {
|
||||
t.Fatalf("Unexpected failure in adding subent")
|
||||
}
|
||||
|
||||
err = a.AddSubnet("abc", &SubnetInfo{Subnet: sub0})
|
||||
if err != nil {
|
||||
t.Fatalf("Unexpected failure in adding overlapping subents to different address spaces")
|
||||
}
|
||||
|
||||
err = a.AddSubnet("abc", &SubnetInfo{Subnet: sub0})
|
||||
if err == nil {
|
||||
t.Fatalf("Failed to detect overlapping subnets: %s and %s", sub0, sub0)
|
||||
}
|
||||
|
||||
_, sub1, _ := net.ParseCIDR("10.20.2.0/24")
|
||||
err = a.AddSubnet("default", &SubnetInfo{Subnet: sub1})
|
||||
if err == nil {
|
||||
t.Fatalf("Failed to detect overlapping subnets: %s and %s", sub0, sub1)
|
||||
}
|
||||
|
||||
_, sub2, _ := net.ParseCIDR("10.128.0.0/9")
|
||||
err = a.AddSubnet("default", &SubnetInfo{Subnet: sub2})
|
||||
if err == nil {
|
||||
t.Fatalf("Failed to detect overlapping subnets: %s and %s", sub1, sub2)
|
||||
}
|
||||
|
||||
_, sub6, err := net.ParseCIDR("1003:1:2:3:4:5:6::/112")
|
||||
if err != nil {
|
||||
t.Fatalf("Wrong input, Can't proceed: %s", err.Error())
|
||||
}
|
||||
err = a.AddSubnet("default", &SubnetInfo{Subnet: sub6})
|
||||
if err != nil {
|
||||
t.Fatalf("Failed to add v6 subnet: %s", err.Error())
|
||||
}
|
||||
|
||||
_, sub6, err = net.ParseCIDR("1003:1:2:3::/64")
|
||||
if err != nil {
|
||||
t.Fatalf("Wrong input, Can't proceed: %s", err.Error())
|
||||
}
|
||||
err = a.AddSubnet("default", &SubnetInfo{Subnet: sub6})
|
||||
if err == nil {
|
||||
t.Fatalf("Failed to detect overlapping v6 subnet")
|
||||
}
|
||||
}
|
||||
|
||||
func TestAdjustAndCheckSubnet(t *testing.T) {
|
||||
_, sub6, _ := net.ParseCIDR("1003:1:2:300::/63")
|
||||
_, err := adjustAndCheckSubnetSize(sub6)
|
||||
if err == nil {
|
||||
t.Fatalf("Failed detect too big v6 subnet")
|
||||
}
|
||||
|
||||
_, sub, _ := net.ParseCIDR("192.0.0.0/7")
|
||||
_, err = adjustAndCheckSubnetSize(sub)
|
||||
if err == nil {
|
||||
t.Fatalf("Failed detect too big v4 subnet")
|
||||
}
|
||||
|
||||
subnet := "1004:1:2:6::/64"
|
||||
_, sub6, _ = net.ParseCIDR(subnet)
|
||||
subnetToSplit, err := adjustAndCheckSubnetSize(sub6)
|
||||
if err != nil {
|
||||
t.Fatalf("Unexpected error returned by adjustAndCheckSubnetSize()")
|
||||
}
|
||||
ones, _ := subnetToSplit.Mask.Size()
|
||||
if ones < minNetSizeV6Eff {
|
||||
t.Fatalf("Wrong effective network size for %s. Expected: %d. Got: %d", subnet, minNetSizeV6Eff, ones)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRemoveSubnet(t *testing.T) {
|
||||
a := NewAllocator()
|
||||
|
||||
input := []struct {
|
||||
addrSpace AddressSpace
|
||||
subnet string
|
||||
}{
|
||||
{"default", "192.168.0.0/16"},
|
||||
{"default", "172.17.0.0/16"},
|
||||
{"default", "10.0.0.0/8"},
|
||||
{"default", "2002:1:2:3:4:5:ffff::/112"},
|
||||
{"splane", "172.17.0.0/16"},
|
||||
{"splane", "10.0.0.0/8"},
|
||||
{"splane", "2002:1:2:3:4:5:6::/112"},
|
||||
{"splane", "2002:1:2:3:4:5:ffff::/112"},
|
||||
}
|
||||
|
||||
for _, i := range input {
|
||||
_, sub, err := net.ParseCIDR(i.subnet)
|
||||
if err != nil {
|
||||
t.Fatalf("Wrong input, Can't proceed: %s", err.Error())
|
||||
}
|
||||
err = a.AddSubnet(i.addrSpace, &SubnetInfo{Subnet: sub})
|
||||
if err != nil {
|
||||
t.Fatalf("Failed to apply input. Can't proceed: %s", err.Error())
|
||||
}
|
||||
}
|
||||
|
||||
_, sub, _ := net.ParseCIDR("172.17.0.0/16")
|
||||
a.RemoveSubnet("default", sub)
|
||||
if len(a.subnetsInfo) != 7 {
|
||||
t.Fatalf("Failed to remove subnet info")
|
||||
}
|
||||
list := a.getSubnetList("default", v4)
|
||||
if len(list) != 257 {
|
||||
t.Fatalf("Failed to effectively remove subnet address space")
|
||||
}
|
||||
|
||||
_, sub, _ = net.ParseCIDR("2002:1:2:3:4:5:ffff::/112")
|
||||
a.RemoveSubnet("default", sub)
|
||||
if len(a.subnetsInfo) != 6 {
|
||||
t.Fatalf("Failed to remove subnet info")
|
||||
}
|
||||
list = a.getSubnetList("default", v6)
|
||||
if len(list) != 0 {
|
||||
t.Fatalf("Failed to effectively remove subnet address space")
|
||||
}
|
||||
|
||||
_, sub, _ = net.ParseCIDR("2002:1:2:3:4:5:6::/112")
|
||||
a.RemoveSubnet("splane", sub)
|
||||
if len(a.subnetsInfo) != 5 {
|
||||
t.Fatalf("Failed to remove subnet info")
|
||||
}
|
||||
list = a.getSubnetList("splane", v6)
|
||||
if len(list) != 1 {
|
||||
t.Fatalf("Failed to effectively remove subnet address space")
|
||||
}
|
||||
}
|
||||
|
||||
func TestGetInternalSubnets(t *testing.T) {
|
||||
// This function tests the splitting of a parent subnet in small host subnets.
|
||||
// The splitting is controlled by the max host size, which is the first parameter
|
||||
// passed to the function. It basically says if the parent subnet host size is
|
||||
// greater than the max host size, split the parent subnet into N internal small
|
||||
// subnets with host size = max host size to cover the same address space.
|
||||
|
||||
input := []struct {
|
||||
internalHostSize int
|
||||
parentSubnet string
|
||||
firstIntSubnet string
|
||||
lastIntSubnet string
|
||||
}{
|
||||
// Test 8 bits prefix network
|
||||
{24, "10.0.0.0/8", "10.0.0.0/8", "10.0.0.0/8"},
|
||||
{16, "10.0.0.0/8", "10.0.0.0/16", "10.255.0.0/16"},
|
||||
{8, "10.0.0.0/8", "10.0.0.0/24", "10.255.255.0/24"},
|
||||
// Test 16 bits prefix network
|
||||
{16, "192.168.0.0/16", "192.168.0.0/16", "192.168.0.0/16"},
|
||||
{8, "192.168.0.0/16", "192.168.0.0/24", "192.168.255.0/24"},
|
||||
// Test 24 bits prefix network
|
||||
{16, "192.168.57.0/24", "192.168.57.0/24", "192.168.57.0/24"},
|
||||
{8, "192.168.57.0/24", "192.168.57.0/24", "192.168.57.0/24"},
|
||||
// Test non byte multiple host size
|
||||
{24, "10.0.0.0/8", "10.0.0.0/8", "10.0.0.0/8"},
|
||||
{20, "10.0.0.0/12", "10.0.0.0/12", "10.0.0.0/12"},
|
||||
{20, "10.128.0.0/12", "10.128.0.0/12", "10.128.0.0/12"},
|
||||
{12, "10.16.0.0/16", "10.16.0.0/20", "10.16.240.0/20"},
|
||||
{13, "10.0.0.0/8", "10.0.0.0/19", "10.255.224.0/19"},
|
||||
{15, "10.0.0.0/8", "10.0.0.0/17", "10.255.128.0/17"},
|
||||
// Test v6 network
|
||||
{16, "2002:1:2:3:4:5:6000::/110", "2002:1:2:3:4:5:6000:0/112", "2002:1:2:3:4:5:6003:0/112"},
|
||||
{16, "2002:1:2:3:4:5:ff00::/104", "2002:1:2:3:4:5:ff00:0/112", "2002:1:2:3:4:5:ffff:0/112"},
|
||||
{12, "2002:1:2:3:4:5:ffff::/112", "2002:1:2:3:4:5:ffff:0/116", "2002:1:2:3:4:5:ffff:f000/116"},
|
||||
{11, "2002:1:2:3:4:5:ffff::/112", "2002:1:2:3:4:5:ffff:0/117", "2002:1:2:3:4:5:ffff:f800/117"},
|
||||
}
|
||||
|
||||
for _, d := range input {
|
||||
assertInternalSubnet(t, d.internalHostSize, d.parentSubnet, d.firstIntSubnet, d.lastIntSubnet)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func TestGetAddress(t *testing.T) {
|
||||
input := []string{
|
||||
/*"10.0.0.0/8", "10.0.0.0/9", */ "10.0.0.0/10", "10.0.0.0/11", "10.0.0.0/12", "10.0.0.0/13", "10.0.0.0/14",
|
||||
"10.0.0.0/15", "10.0.0.0/16", "10.0.0.0/17", "10.0.0.0/18", "10.0.0.0/19", "10.0.0.0/20", "10.0.0.0/21",
|
||||
"10.0.0.0/22", "10.0.0.0/23", "10.0.0.0/24", "10.0.0.0/25", "10.0.0.0/26", "10.0.0.0/27", "10.0.0.0/28",
|
||||
"10.0.0.0/29", "10.0.0.0/30", "10.0.0.0/31"}
|
||||
|
||||
for _, subnet := range input {
|
||||
assertGetAddress(t, subnet)
|
||||
}
|
||||
}
|
||||
|
||||
func TestGetSubnetList(t *testing.T) {
|
||||
a := NewAllocator()
|
||||
input := []struct {
|
||||
addrSpace AddressSpace
|
||||
subnet string
|
||||
}{
|
||||
{"default", "192.168.0.0/16"},
|
||||
{"default", "172.17.0.0/16"},
|
||||
{"default", "10.0.0.0/8"},
|
||||
{"default", "2002:1:2:3:4:5:6::/112"},
|
||||
{"default", "2002:1:2:3:4:5:ffff::/112"},
|
||||
{"splane", "172.17.0.0/16"},
|
||||
{"splane", "10.0.0.0/8"},
|
||||
{"splane", "2002:1:2:3:4:5:ff00::/104"},
|
||||
}
|
||||
|
||||
for _, i := range input {
|
||||
_, sub, err := net.ParseCIDR(i.subnet)
|
||||
if err != nil {
|
||||
t.Fatalf("Wrong input, Can't proceed: %s", err.Error())
|
||||
}
|
||||
err = a.AddSubnet(i.addrSpace, &SubnetInfo{Subnet: sub})
|
||||
if err != nil {
|
||||
t.Fatalf("Failed to apply input. Can't proceed: %s", err.Error())
|
||||
}
|
||||
}
|
||||
|
||||
list := a.getSubnetList("default", v4)
|
||||
if len(list) != 258 {
|
||||
t.Fatalf("Incorrect number of internal subnets for ipv4 version. Expected 258. Got %d.", len(list))
|
||||
}
|
||||
list = a.getSubnetList("splane", v4)
|
||||
if len(list) != 257 {
|
||||
t.Fatalf("Incorrect number of internal subnets for ipv4 version. Expected 257. Got %d.", len(list))
|
||||
}
|
||||
|
||||
list = a.getSubnetList("default", v6)
|
||||
if len(list) != 2 {
|
||||
t.Fatalf("Incorrect number of internal subnets for ipv6 version. Expected 2. Got %d.", len(list))
|
||||
}
|
||||
list = a.getSubnetList("splane", v6)
|
||||
if len(list) != 256 {
|
||||
t.Fatalf("Incorrect number of internal subnets for ipv6 version. Expected 256. Got %d.", len(list))
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func TestRequestSyntaxCheck(t *testing.T) {
|
||||
var (
|
||||
a = NewAllocator()
|
||||
subnet = "192.168.0.0/16"
|
||||
addSpace = AddressSpace("green")
|
||||
)
|
||||
|
||||
// Add subnet and create base request
|
||||
_, sub, _ := net.ParseCIDR(subnet)
|
||||
a.AddSubnet(addSpace, &SubnetInfo{Subnet: sub})
|
||||
req := &AddressRequest{Subnet: *sub}
|
||||
|
||||
// Empty address space request
|
||||
_, err := a.Request("", req)
|
||||
if err == nil {
|
||||
t.Fatalf("Failed to detect wrong request: empty address space")
|
||||
}
|
||||
|
||||
// Preferred address from different subnet in request
|
||||
req.Address = net.ParseIP("172.17.0.23")
|
||||
_, err = a.Request(addSpace, req)
|
||||
if err == nil {
|
||||
t.Fatalf("Failed to detect wrong request: preferred IP from different subnet")
|
||||
}
|
||||
|
||||
// Preferred address specified and nil subnet
|
||||
req = &AddressRequest{Address: net.ParseIP("172.17.0.23")}
|
||||
_, err = a.Request(addSpace, req)
|
||||
if err == nil {
|
||||
t.Fatalf("Failed to detect wrong request: subnet not specified but preferred address specified")
|
||||
}
|
||||
}
|
||||
|
||||
func TestRequest(t *testing.T) {
|
||||
// Request N addresses from different size subnets, verifying last request
|
||||
// returns expected address. Internal subnet host size is Allocator's default, 16
|
||||
input := []struct {
|
||||
subnet string
|
||||
numReq int
|
||||
lastIP string
|
||||
}{
|
||||
{"192.168.59.0/24", 254, "192.168.59.254"},
|
||||
{"192.168.240.0/20", 254, "192.168.240.254"},
|
||||
{"192.168.0.0/16", 254, "192.168.0.254"},
|
||||
{"10.16.0.0/16", 254, "10.16.0.254"},
|
||||
{"10.128.0.0/12", 254, "10.128.0.254"},
|
||||
{"10.0.0.0/8", 254, "10.0.0.254"},
|
||||
{"192.168.0.0/16", 256, "192.168.1.2"},
|
||||
{"10.0.0.0/8", 256, "10.0.1.2"},
|
||||
|
||||
{"192.168.128.0/18", 4 * 254, "192.168.131.254"},
|
||||
{"192.168.240.0/20", 16 * 254, "192.168.255.254"},
|
||||
|
||||
{"192.168.0.0/16", 256 * 254, "192.168.255.254"},
|
||||
{"10.0.0.0/8", 256 * 254, "10.0.255.254"},
|
||||
{"10.0.0.0/8", 257 * 254, "10.1.0.254"},
|
||||
//{"10.0.0.0/8", 100 * 256 * 254, "10.99.255.254"},
|
||||
}
|
||||
|
||||
for _, d := range input {
|
||||
assertNRequests(t, d.subnet, d.numReq, d.lastIP)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRelease(t *testing.T) {
|
||||
var (
|
||||
err error
|
||||
req *AddressRequest
|
||||
subnet = "192.168.0.0/16"
|
||||
)
|
||||
|
||||
_, sub, _ := net.ParseCIDR(subnet)
|
||||
a := getAllocator(sub)
|
||||
req = &AddressRequest{Subnet: *sub}
|
||||
bm := a.addresses[isKey{"default", subnet}]
|
||||
|
||||
// Allocate all addresses
|
||||
for err != ErrNoAvailableIPs {
|
||||
_, err = a.Request("default", req)
|
||||
}
|
||||
|
||||
toRelease := []struct {
|
||||
address string
|
||||
}{
|
||||
{"192.168.0.1"},
|
||||
{"192.168.0.2"},
|
||||
{"192.168.0.3"},
|
||||
{"192.168.0.4"},
|
||||
{"192.168.0.5"},
|
||||
{"192.168.0.6"},
|
||||
{"192.168.0.7"},
|
||||
{"192.168.0.8"},
|
||||
{"192.168.0.9"},
|
||||
{"192.168.0.10"},
|
||||
{"192.168.0.30"},
|
||||
{"192.168.0.31"},
|
||||
{"192.168.1.32"},
|
||||
|
||||
{"192.168.0.254"},
|
||||
{"192.168.1.1"},
|
||||
{"192.168.1.2"},
|
||||
|
||||
{"192.168.1.3"},
|
||||
|
||||
{"192.168.255.253"},
|
||||
{"192.168.255.254"},
|
||||
}
|
||||
|
||||
// One by one, relase the address and request again. We should get the same IP
|
||||
req = &AddressRequest{Subnet: *sub}
|
||||
for i, inp := range toRelease {
|
||||
address := net.ParseIP(inp.address)
|
||||
a.Release("default", address)
|
||||
if bm.freeAddresses != 1 {
|
||||
t.Fatalf("Failed to update free address count after release. Expected %d, Found: %d", i+1, bm.freeAddresses)
|
||||
}
|
||||
|
||||
rsp, err := a.Request("default", req)
|
||||
if err != nil {
|
||||
t.Fatalf("Failed to obtain the address: %s", err.Error())
|
||||
}
|
||||
if !address.Equal(rsp.Address) {
|
||||
t.Fatalf("Failed to obtain the same address. Expected: %s, Got: %s", address, rsp.Address)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func assertInternalSubnet(t *testing.T, hostSize int, bigSubnet, firstSmall, lastSmall string) {
|
||||
_, subnet, _ := net.ParseCIDR(bigSubnet)
|
||||
list, _ := getInternalSubnets(subnet, hostSize)
|
||||
count := 1
|
||||
ones, bits := subnet.Mask.Size()
|
||||
diff := bits - ones - hostSize
|
||||
if diff > 0 {
|
||||
count <<= uint(diff)
|
||||
}
|
||||
|
||||
if len(list) != count {
|
||||
t.Fatalf("Wrong small subnets number. Expected: %d, Got: %d", count, len(list))
|
||||
}
|
||||
if firstSmall != list[0].String() {
|
||||
t.Fatalf("Wrong first small subent. Expected: %v, Got: %v", firstSmall, list[0])
|
||||
}
|
||||
if lastSmall != list[count-1].String() {
|
||||
t.Fatalf("Wrong last small subent. Expected: %v, Got: %v", lastSmall, list[count-1])
|
||||
}
|
||||
}
|
||||
|
||||
func assertGetAddress(t *testing.T, subnet string) {
|
||||
var (
|
||||
err error
|
||||
printTime = false
|
||||
a = &Allocator{}
|
||||
)
|
||||
|
||||
_, sub, _ := net.ParseCIDR(subnet)
|
||||
ones, bits := sub.Mask.Size()
|
||||
zeroes := bits - ones
|
||||
numAddresses := 1 << uint(zeroes)
|
||||
|
||||
var expectedMax uint32
|
||||
if numAddresses >= 32 {
|
||||
expectedMax = uint32(1<<32 - 1)
|
||||
} else {
|
||||
expectedMax = (1<<uint(numAddresses) - 1) << uint(32-numAddresses)
|
||||
}
|
||||
|
||||
bm := &bitmask{
|
||||
subnet: sub,
|
||||
addressMask: bitseq.New(uint32(numAddresses)),
|
||||
freeAddresses: numAddresses,
|
||||
}
|
||||
numBlocks := bm.addressMask.Count
|
||||
|
||||
start := time.Now()
|
||||
run := 0
|
||||
for err != ErrNoAvailableIPs {
|
||||
_, err = a.getAddress(bm, nil, v4)
|
||||
run++
|
||||
}
|
||||
if printTime {
|
||||
fmt.Printf("\nTaken %v, to allocate all addresses on %s. (nemAddresses: %d. Runs: %d)", time.Since(start), subnet, numAddresses, run)
|
||||
}
|
||||
if bm.addressMask.Block != expectedMax || bm.addressMask.Count != numBlocks {
|
||||
t.Fatalf("Failed to effectively reserve all addresses on %s. Expected (0x%x, %d) as first sequence. Found (0x%x,%d)",
|
||||
subnet, expectedMax, numBlocks, bm.addressMask.Block, bm.addressMask.Count)
|
||||
}
|
||||
}
|
||||
|
||||
func assertNRequests(t *testing.T, subnet string, numReq int, lastExpectedIP string) {
|
||||
var (
|
||||
err error
|
||||
req *AddressRequest
|
||||
rsp *AddressResponse
|
||||
printTime = false
|
||||
)
|
||||
|
||||
_, sub, _ := net.ParseCIDR(subnet)
|
||||
lastIP := net.ParseIP(lastExpectedIP)
|
||||
|
||||
a := getAllocator(sub)
|
||||
req = &AddressRequest{Subnet: *sub}
|
||||
|
||||
i := 0
|
||||
start := time.Now()
|
||||
for ; i < numReq; i++ {
|
||||
rsp, err = a.Request("default", req)
|
||||
}
|
||||
if printTime {
|
||||
fmt.Printf("\nTaken %v, to allocate %d addresses on %s\n", time.Since(start), numReq, subnet)
|
||||
}
|
||||
|
||||
if !lastIP.Equal(rsp.Address) {
|
||||
t.Fatalf("Wrong last IP. Expected %s. Got: %s (err: %v, ind: %d)", lastExpectedIP, rsp.Address.String(), err, i)
|
||||
}
|
||||
}
|
||||
|
||||
func benchmarkRequest(subnet *net.IPNet) {
|
||||
var err error
|
||||
|
||||
a := NewAllocator()
|
||||
a.internalHostSize = 20
|
||||
a.AddSubnet("default", &SubnetInfo{Subnet: subnet})
|
||||
|
||||
req := &AddressRequest{Subnet: *subnet}
|
||||
for err != ErrNoAvailableIPs {
|
||||
_, err = a.Request("default", req)
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
func benchMarkRequest(subnet *net.IPNet, b *testing.B) {
|
||||
for n := 0; n < b.N; n++ {
|
||||
benchmarkRequest(subnet)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkRequest_24(b *testing.B) {
|
||||
benchmarkRequest(&net.IPNet{IP: []byte{10, 0, 0, 0}, Mask: []byte{255, 255, 255, 0}})
|
||||
}
|
||||
|
||||
func BenchmarkRequest_16(b *testing.B) {
|
||||
benchmarkRequest(&net.IPNet{IP: []byte{10, 0, 0, 0}, Mask: []byte{255, 255, 0, 0}})
|
||||
}
|
||||
|
||||
func BenchmarkRequest_8(b *testing.B) {
|
||||
benchmarkRequest(&net.IPNet{IP: []byte{10, 0, 0, 0}, Mask: []byte{255, 0xfc, 0, 0}})
|
||||
}
|
||||
Loading…
Reference in New Issue