From 0f9f9a132eb27c2a8ed8f3115e560eb90b40fadf Mon Sep 17 00:00:00 2001
From: Rob Murray <rob.murray@docker.com>
Date: Wed, 6 Dec 2023 11:54:45 +0000
Subject: [PATCH] Move 'netip' utils from 'ipam' to 'internal'.

Signed-off-by: Rob Murray <rob.murray@docker.com>
---
 .../utils.go => internal/netiputil/netiputil.go}    | 12 ++++++------
 libnetwork/ipam/allocator.go                        | 13 +++++++------
 2 files changed, 13 insertions(+), 12 deletions(-)
 rename libnetwork/{ipam/utils.go => internal/netiputil/netiputil.go} (75%)

diff --git a/libnetwork/ipam/utils.go b/libnetwork/internal/netiputil/netiputil.go
similarity index 75%
rename from libnetwork/ipam/utils.go
rename to libnetwork/internal/netiputil/netiputil.go
index 4e7d72c2e0..3fa543be92 100644
--- a/libnetwork/ipam/utils.go
+++ b/libnetwork/internal/netiputil/netiputil.go
@@ -1,4 +1,4 @@
-package ipam
+package netiputil
 
 import (
 	"net"
@@ -7,7 +7,7 @@ import (
 	"github.com/docker/docker/libnetwork/ipbits"
 )
 
-func toIPNet(p netip.Prefix) *net.IPNet {
+func ToIPNet(p netip.Prefix) *net.IPNet {
 	if !p.IsValid() {
 		return nil
 	}
@@ -17,7 +17,7 @@ func toIPNet(p netip.Prefix) *net.IPNet {
 	}
 }
 
-func toPrefix(n *net.IPNet) (netip.Prefix, bool) {
+func ToPrefix(n *net.IPNet) (netip.Prefix, bool) {
 	if ll := len(n.Mask); ll != net.IPv4len && ll != net.IPv6len {
 		return netip.Prefix{}, false
 	}
@@ -35,14 +35,14 @@ func toPrefix(n *net.IPNet) (netip.Prefix, bool) {
 	return netip.PrefixFrom(addr.Unmap(), ones), true
 }
 
-func hostID(addr netip.Addr, bits uint) uint64 {
+func HostID(addr netip.Addr, bits uint) uint64 {
 	return ipbits.Field(addr, bits, uint(addr.BitLen()))
 }
 
 // subnetRange returns the amount to add to network.Addr() in order to yield the
 // first and last addresses in subnet, respectively.
-func subnetRange(network, subnet netip.Prefix) (start, end uint64) {
-	start = hostID(subnet.Addr(), uint(network.Bits()))
+func SubnetRange(network, subnet netip.Prefix) (start, end uint64) {
+	start = HostID(subnet.Addr(), uint(network.Bits()))
 	end = start + (1 << uint64(subnet.Addr().BitLen()-subnet.Bits())) - 1
 	return start, end
 }
diff --git a/libnetwork/ipam/allocator.go b/libnetwork/ipam/allocator.go
index 55b51643d1..79376c49bb 100644
--- a/libnetwork/ipam/allocator.go
+++ b/libnetwork/ipam/allocator.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/containerd/log"
 	"github.com/docker/docker/libnetwork/bitmap"
+	"github.com/docker/docker/libnetwork/internal/netiputil"
 	"github.com/docker/docker/libnetwork/ipamapi"
 	"github.com/docker/docker/libnetwork/ipbits"
 	"github.com/docker/docker/libnetwork/types"
@@ -46,7 +47,7 @@ func newAddrSpace(predefined []*net.IPNet) (*addrSpace, error) {
 	pdf := make([]netip.Prefix, len(predefined))
 	for i, n := range predefined {
 		var ok bool
-		pdf[i], ok = toPrefix(n)
+		pdf[i], ok = netiputil.ToPrefix(n)
 		if !ok {
 			return nil, fmt.Errorf("network at index %d (%v) is not in canonical form", i, n)
 		}
@@ -91,7 +92,7 @@ func (a *Allocator) RequestPool(addressSpace, requestedPool, requestedSubPool st
 		if err != nil {
 			return "", nil, nil, err
 		}
-		return k.String(), toIPNet(k.Subnet), nil, nil
+		return k.String(), netiputil.ToIPNet(k.Subnet), nil, nil
 	}
 
 	if k.Subnet, err = netip.ParsePrefix(requestedPool); err != nil {
@@ -119,7 +120,7 @@ func (a *Allocator) RequestPool(addressSpace, requestedPool, requestedSubPool st
 		return "", nil, nil, err
 	}
 
-	return k.String(), toIPNet(k.Subnet), nil, nil
+	return k.String(), netiputil.ToIPNet(k.Subnet), nil, nil
 }
 
 // ReleasePool releases the address pool identified by the passed id
@@ -336,7 +337,7 @@ func (aSpace *addrSpace) releaseAddress(nw, sub netip.Prefix, address netip.Addr
 
 	defer log.G(context.TODO()).Debugf("Released address Address:%v Sequence:%s", address, p.addrs)
 
-	return p.addrs.Unset(hostID(address, uint(nw.Bits())))
+	return p.addrs.Unset(netiputil.HostID(address, uint(nw.Bits())))
 }
 
 func getAddress(base netip.Prefix, bitmask *bitmap.Bitmap, prefAddress netip.Addr, ipr netip.Prefix, serial bool) (netip.Addr, error) {
@@ -353,10 +354,10 @@ func getAddress(base netip.Prefix, bitmask *bitmap.Bitmap, prefAddress netip.Add
 	if ipr == (netip.Prefix{}) && prefAddress == (netip.Addr{}) {
 		ordinal, err = bitmask.SetAny(serial)
 	} else if prefAddress != (netip.Addr{}) {
-		ordinal = hostID(prefAddress, uint(base.Bits()))
+		ordinal = netiputil.HostID(prefAddress, uint(base.Bits()))
 		err = bitmask.Set(ordinal)
 	} else {
-		start, end := subnetRange(base, ipr)
+		start, end := netiputil.SubnetRange(base, ipr)
 		ordinal, err = bitmask.SetAnyInRange(start, end, serial)
 	}