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structures.go
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structures.go
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package ipam
import (
"fmt"
"net/netip"
"strings"
"sync"
"github.com/docker/docker/libnetwork/bitmap"
"github.com/docker/docker/libnetwork/ipamapi"
"github.com/docker/docker/libnetwork/types"
)
// PoolID is the pointer to the configured pools in each address space
type PoolID struct {
AddressSpace string
SubnetKey
}
// PoolData contains the configured pool data
type PoolData struct {
addrs *bitmap.Bitmap
children map[netip.Prefix]struct{}
// Whether to implicitly release the pool once it no longer has any children.
autoRelease bool
}
// SubnetKey is the composite key to an address pool within an address space.
type SubnetKey struct {
Subnet, ChildSubnet netip.Prefix
}
// addrSpace contains the pool configurations for the address space
type addrSpace struct {
// Master subnet pools, indexed by the value's stringified PoolData.Pool field.
subnets map[netip.Prefix]*PoolData
// Predefined pool for the address space
predefined []netip.Prefix
predefinedStartIndex int
sync.Mutex
}
// PoolIDFromString creates a new PoolID and populates the SubnetKey object
// reading it from the given string.
func PoolIDFromString(str string) (pID PoolID, err error) {
if str == "" {
return pID, types.InvalidParameterErrorf("invalid string form for subnetkey: %s", str)
}
p := strings.Split(str, "/")
if len(p) != 3 && len(p) != 5 {
return pID, types.InvalidParameterErrorf("invalid string form for subnetkey: %s", str)
}
pID.AddressSpace = p[0]
pID.Subnet, err = netip.ParsePrefix(p[1] + "/" + p[2])
if err != nil {
return pID, types.InvalidParameterErrorf("invalid string form for subnetkey: %s", str)
}
if len(p) == 5 {
pID.ChildSubnet, err = netip.ParsePrefix(p[3] + "/" + p[4])
if err != nil {
return pID, types.InvalidParameterErrorf("invalid string form for subnetkey: %s", str)
}
}
return pID, nil
}
// String returns the string form of the SubnetKey object
func (s *PoolID) String() string {
if s.ChildSubnet == (netip.Prefix{}) {
return s.AddressSpace + "/" + s.Subnet.String()
} else {
return s.AddressSpace + "/" + s.Subnet.String() + "/" + s.ChildSubnet.String()
}
}
// String returns the string form of the PoolData object
func (p *PoolData) String() string {
return fmt.Sprintf("PoolData[Children: %d]", len(p.children))
}
// allocateSubnet adds the subnet k to the address space.
func (aSpace *addrSpace) allocateSubnet(nw, sub netip.Prefix) error {
aSpace.Lock()
defer aSpace.Unlock()
// Check if already allocated
if pool, ok := aSpace.subnets[nw]; ok {
var childExists bool
if sub != (netip.Prefix{}) {
_, childExists = pool.children[sub]
}
if sub == (netip.Prefix{}) || childExists {
// This means the same pool is already allocated. allocateSubnet is called when there
// is request for a pool/subpool. It should ensure there is no overlap with existing pools
return ipamapi.ErrPoolOverlap
}
}
return aSpace.allocateSubnetL(nw, sub)
}
func (aSpace *addrSpace) allocateSubnetL(nw, sub netip.Prefix) error {
// If master pool, check for overlap
if sub == (netip.Prefix{}) {
if aSpace.overlaps(nw) {
return ipamapi.ErrPoolOverlap
}
// This is a new master pool, add it along with corresponding bitmask
aSpace.subnets[nw] = newPoolData(nw)
return nil
}
// This is a new non-master pool (subPool)
if nw.Addr().BitLen() != sub.Addr().BitLen() {
return fmt.Errorf("pool and subpool are of incompatible address families")
}
// Look for parent pool
pp, ok := aSpace.subnets[nw]
if !ok {
// Parent pool does not exist, add it along with corresponding bitmask
pp = newPoolData(nw)
pp.autoRelease = true
aSpace.subnets[nw] = pp
}
pp.children[sub] = struct{}{}
return nil
}
func (aSpace *addrSpace) releaseSubnet(nw, sub netip.Prefix) error {
aSpace.Lock()
defer aSpace.Unlock()
p, ok := aSpace.subnets[nw]
if !ok {
return ipamapi.ErrBadPool
}
if sub != (netip.Prefix{}) {
if _, ok := p.children[sub]; !ok {
return ipamapi.ErrBadPool
}
delete(p.children, sub)
} else {
p.autoRelease = true
}
if len(p.children) == 0 && p.autoRelease {
delete(aSpace.subnets, nw)
}
return nil
}
// overlaps reports whether nw contains any IP addresses in common with any of
// the existing subnets in this address space.
func (aSpace *addrSpace) overlaps(nw netip.Prefix) bool {
for pool := range aSpace.subnets {
if pool.Overlaps(nw) {
return true
}
}
return false
}