libnetwork to handle allocation of ipv6

Signed-off-by: Alessandro Boch <aboch@docker.com>

libnetwork/controller.go

@@ -343,15 +343,13 @@ func (c *controller) NewNetwork(networkType, name string, options ...NetworkOpti
 		return nil, err
 	}
 
-	cnfs, err := network.ipamAllocate()
+	err := network.ipamAllocate()
 	if err != nil {
 		return nil, err
 	}
 	defer func() {
 		if err != nil {
-			for _, cn := range cnfs {
-				cn()
-			}
+			network.ipamRelease()
 		}
 	}()
 
@@ -386,7 +384,7 @@ func (c *controller) addNetwork(n *network) error {
 	}
 
 	// Create the network
-	if err := d.CreateNetwork(n.id, n.generic, n.getIPv4Data(), n.getIPv6Data()); err != nil {
+	if err := d.CreateNetwork(n.id, n.generic, n.getIPData(4), n.getIPData(6)); err != nil {
 		return err
 	}
 

libnetwork/endpoint.go

@@ -630,13 +630,44 @@ func (ep *endpoint) assignAddress() error {
 	if err != nil {
 		return err
 	}
-	for _, d := range n.getIPInfo() {
-		var addr *net.IPNet
-		addr, _, err = ipam.RequestAddress(d.PoolID, nil, nil)
+	err = ep.assignAddressVersion(4, ipam)
+	if err != nil {
+		return err
+	}
+	return ep.assignAddressVersion(6, ipam)
+}
+
+func (ep *endpoint) assignAddressVersion(ipVer int, ipam ipamapi.Ipam) error {
+	var (
+		poolID  *string
+		address **net.IPNet
+	)
+
+	n := ep.getNetwork()
+	switch ipVer {
+	case 4:
+		poolID = &ep.iface.v4PoolID
+		address = &ep.iface.addr
+	case 6:
+		poolID = &ep.iface.v6PoolID
+		address = &ep.iface.addrv6
+	default:
+		return types.InternalErrorf("incorrect ip version number passed: %d", ipVer)
+	}
+
+	ipInfo := n.getIPInfo(ipVer)
+
+	// ipv6 address is not mandatory
+	if len(ipInfo) == 0 && ipVer == 6 {
+		return nil
+	}
+
+	for _, d := range ipInfo {
+		addr, _, err := ipam.RequestAddress(d.PoolID, nil, nil)
 		if err == nil {
 			ep.Lock()
-			ep.iface.addr = addr
-			ep.iface.poolID = d.PoolID
+			*address = addr
+			*poolID = d.PoolID
 			ep.Unlock()
 			return nil
 		}
@@ -644,7 +675,7 @@ func (ep *endpoint) assignAddress() error {
 			return err
 		}
 	}
-	return fmt.Errorf("no available ip addresses on this network address pools: %s (%s)", n.Name(), n.ID())
+	return fmt.Errorf("no available IPv%d addresses on this network's address pools: %s (%s)", ipVer, n.Name(), n.ID())
 }
 
 func (ep *endpoint) releaseAddress() {
@@ -657,7 +688,12 @@ func (ep *endpoint) releaseAddress() {
 		log.Warnf("Failed to retrieve ipam driver to release interface address on delete of endpoint %s (%s): %v", ep.Name(), ep.ID(), err)
 		return
 	}
-	if err := ipam.ReleaseAddress(ep.iface.poolID, ep.iface.addr.IP); err != nil {
+	if err := ipam.ReleaseAddress(ep.iface.v4PoolID, ep.iface.addr.IP); err != nil {
 		log.Warnf("Failed to release ip address %s on delete of endpoint %s (%s): %v", ep.iface.addr.IP, ep.Name(), ep.ID(), err)
 	}
+	if ep.iface.addrv6 != nil && ep.iface.addrv6.IP.IsGlobalUnicast() {
+		if err := ipam.ReleaseAddress(ep.iface.v6PoolID, ep.iface.addrv6.IP); err != nil {
+			log.Warnf("Failed to release ip address %s on delete of endpoint %s (%s): %v", ep.iface.addrv6.IP, ep.Name(), ep.ID(), err)
+		}
+	}
 }

libnetwork/endpoint_info.go

@@ -48,7 +48,8 @@ type endpointInterface struct {
 	srcName   string
 	dstPrefix string
 	routes    []*net.IPNet
-	poolID    string
+	v4PoolID  string
+	v6PoolID  string
 }
 
 func (epi *endpointInterface) MarshalJSON() ([]byte, error) {
@@ -69,7 +70,8 @@ func (epi *endpointInterface) MarshalJSON() ([]byte, error) {
 		routes = append(routes, route.String())
 	}
 	epMap["routes"] = routes
-	epMap["poolID"] = epi.poolID
+	epMap["v4PoolID"] = epi.v4PoolID
+	epMap["v6PoolID"] = epi.v6PoolID
 	return json.Marshal(epMap)
 }
 
@@ -111,7 +113,8 @@ func (epi *endpointInterface) UnmarshalJSON(b []byte) error {
 			epi.routes = append(epi.routes, ipr)
 		}
 	}
-	epi.poolID = epMap["poolID"].(string)
+	epi.v4PoolID = epMap["v4PoolID"].(string)
+	epi.v6PoolID = epMap["v6PoolID"].(string)
 
 	return nil
 }
@@ -122,7 +125,8 @@ func (epi *endpointInterface) CopyTo(dstEpi *endpointInterface) error {
 	dstEpi.addrv6 = types.GetIPNetCopy(epi.addrv6)
 	dstEpi.srcName = epi.srcName
 	dstEpi.dstPrefix = epi.dstPrefix
-	dstEpi.poolID = epi.poolID
+	dstEpi.v4PoolID = epi.v4PoolID
+	dstEpi.v6PoolID = epi.v6PoolID
 
 	for _, route := range epi.routes {
 		dstEpi.routes = append(dstEpi.routes, types.GetIPNetCopy(route))

libnetwork/libnetwork_internal_test.go

@@ -197,7 +197,8 @@ func TestEndpointMarshalling(t *testing.T) {
 			addrv6:    nw6,
 			srcName:   "veth12ab1314",
 			dstPrefix: "eth",
-			poolID:    "poolpool",
+			v4PoolID:  "poolpool",
+			v6PoolID:  "poolv6",
 		},
 	}
 
@@ -224,7 +225,7 @@ func compareEndpointInterface(a, b *endpointInterface) bool {
 	if a == nil || b == nil {
 		return false
 	}
-	return a.srcName == b.srcName && a.dstPrefix == b.dstPrefix && a.poolID == b.poolID &&
+	return a.srcName == b.srcName && a.dstPrefix == b.dstPrefix && a.v4PoolID == b.v4PoolID && a.v6PoolID == b.v6PoolID &&
 		types.CompareIPNet(a.addr, b.addr) && types.CompareIPNet(a.addrv6, b.addrv6)
 }
 
@@ -319,7 +320,7 @@ func TestAuxAddresses(t *testing.T) {
 
 		n.ipamV4Config = []*IpamConf{&IpamConf{PreferredPool: i.masterPool, SubPool: i.subPool, AuxAddresses: i.auxAddresses}}
 
-		_, err := n.ipamAllocate()
+		err = n.ipamAllocate()
 
 		if i.good != (err == nil) {
 			t.Fatalf("Unexpected result for %v: %v", i, err)

libnetwork/network.go

@@ -65,7 +65,7 @@ type IpamConf struct {
 	// this becomes the container pool
 	SubPool string
 	// Input options for IPAM Driver (optional)
-	Options map[string]string // IPAM input options
+	Options map[string]string
 	// IPv6 flag, Needed when no preferred pool is specified
 	IsV6 bool
 	// Preferred Network Gateway address (optional)
@@ -281,6 +281,14 @@ func (n *network) CopyTo(o datastore.KVObject) error {
 		dstN.ipamV4Info = append(dstN.ipamV4Info, dstV4Info)
 	}
 
+	if n.ipamV6Info != nil {
+		for _, v6info := range n.ipamV6Info {
+			dstV6Info := &IpamInfo{}
+			v6info.CopyTo(dstV6Info)
+			dstN.ipamV6Info = append(dstN.ipamV6Info, dstV6Info)
+		}
+	}
+
 	dstN.generic = options.Generic{}
 	for k, v := range n.generic {
 		dstN.generic[k] = v
@@ -786,44 +794,76 @@ func (n *network) getController() *controller {
 	return n.ctrlr
 }
 
-func (n *network) ipamAllocate() ([]func(), error) {
-	var (
-		cnl []func()
-		err error
-	)
-
+func (n *network) ipamAllocate() error {
 	// For now also exclude bridge from using new ipam
 	if n.Type() == "host" || n.Type() == "null" || n.Type() == "bridge" {
-		return cnl, nil
+		return nil
 	}
 
 	ipam, err := n.getController().getIpamDriver(n.ipamType)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	if n.addrSpace == "" {
 		if n.addrSpace, err = n.deriveAddressSpace(); err != nil {
-			return nil, err
+			return err
 		}
 	}
 
-	if n.ipamV4Config == nil {
-		n.ipamV4Config = []*IpamConf{&IpamConf{}}
+	err = n.ipamAllocateVersion(4, ipam)
+	if err != nil {
+		return err
 	}
 
-	n.ipamV4Info = make([]*IpamInfo, len(n.ipamV4Config))
+	defer func() {
+		if err != nil {
+			n.ipamReleaseVersion(4, ipam)
+		}
+	}()
 
-	for i, cfg := range n.ipamV4Config {
+	return n.ipamAllocateVersion(6, ipam)
+}
+
+func (n *network) ipamAllocateVersion(ipVer int, ipam ipamapi.Ipam) error {
+	var (
+		cfgList  *[]*IpamConf
+		infoList *[]*IpamInfo
+		err      error
+	)
+
+	switch ipVer {
+	case 4:
+		cfgList = &n.ipamV4Config
+		infoList = &n.ipamV4Info
+	case 6:
+		cfgList = &n.ipamV6Config
+		infoList = &n.ipamV6Info
+	default:
+		return types.InternalErrorf("incorrect ip version passed to ipam allocate: %d", ipVer)
+	}
+
+	if *cfgList == nil {
+		if ipVer == 6 {
+			return nil
+		}
+		*cfgList = []*IpamConf{&IpamConf{}}
+	}
+
+	*infoList = make([]*IpamInfo, len(*cfgList))
+
+	log.Debugf("allocating IPv%d pools for network %s (%s)", ipVer, n.Name(), n.ID())
+
+	for i, cfg := range *cfgList {
 		if err = cfg.Validate(); err != nil {
-			return nil, err
+			return err
 		}
 		d := &IpamInfo{}
-		n.ipamV4Info[i] = d
+		(*infoList)[i] = d
 
 		d.PoolID, d.Pool, d.Meta, err = ipam.RequestPool(n.addrSpace, cfg.PreferredPool, cfg.SubPool, cfg.Options, cfg.IsV6)
 		if err != nil {
-			return nil, err
+			return err
 		}
 
 		defer func() {
@@ -836,7 +876,7 @@ func (n *network) ipamAllocate() ([]func(), error) {
 
 		if gws, ok := d.Meta[netlabel.Gateway]; ok {
 			if d.Gateway, err = types.ParseCIDR(gws); err != nil {
-				return nil, types.BadRequestErrorf("failed to parse gateway address (%v) returned by ipam driver: %v", gws, err)
+				return types.BadRequestErrorf("failed to parse gateway address (%v) returned by ipam driver: %v", gws, err)
 			}
 		}
 
@@ -845,15 +885,10 @@ func (n *network) ipamAllocate() ([]func(), error) {
 		// If none of the above is true, libnetwork will allocate one.
 		if cfg.Gateway != "" || d.Gateway == nil {
 			if d.Gateway, _, err = ipam.RequestAddress(d.PoolID, net.ParseIP(cfg.Gateway), nil); err != nil {
-				return nil, types.InternalErrorf("failed to allocate gateway (%v): %v", cfg.Gateway, err)
+				return types.InternalErrorf("failed to allocate gateway (%v): %v", cfg.Gateway, err)
 			}
 		}
 
-		cnl = append(cnl, func() {
-			if err := ipam.ReleaseAddress(d.PoolID, d.Gateway.IP); err != nil {
-				log.Warnf("Failed to release gw address %s after failure to create network %s (%s)", d.Gateway, n.Name(), n.ID())
-			}
-		})
 		// Auxiliary addresses must be part of the master address pool
 		// If they fall into the container addressable pool, libnetwork will reserve them
 		if cfg.AuxAddresses != nil {
@@ -861,27 +896,20 @@ func (n *network) ipamAllocate() ([]func(), error) {
 			d.IPAMData.AuxAddresses = make(map[string]*net.IPNet, len(cfg.AuxAddresses))
 			for k, v := range cfg.AuxAddresses {
 				if ip = net.ParseIP(v); ip == nil {
-					return nil, types.BadRequestErrorf("non parsable secondary ip address (%s:%s) passed for network %s", k, v, n.Name())
+					return types.BadRequestErrorf("non parsable secondary ip address (%s:%s) passed for network %s", k, v, n.Name())
 				}
 				if !d.Pool.Contains(ip) {
-					return cnl, types.ForbiddenErrorf("auxilairy address: (%s:%s) must belong to the master pool: %s", k, v, d.Pool)
+					return types.ForbiddenErrorf("auxilairy address: (%s:%s) must belong to the master pool: %s", k, v, d.Pool)
 				}
 				// Attempt reservation in the container addressable pool, silent the error if address does not belong to that pool
 				if d.IPAMData.AuxAddresses[k], _, err = ipam.RequestAddress(d.PoolID, ip, nil); err != nil && err != ipamapi.ErrIPOutOfRange {
-					return nil, types.InternalErrorf("failed to allocate secondary ip address (%s:%s): %v", k, v, err)
-				}
-				if err == nil {
-					cnl = append(cnl, func() {
-						if err := ipam.ReleaseAddress(d.PoolID, ip); err != nil {
-							log.Warnf("Failed to release secondary ip address %s(%s) after failure to create network %s (%s)", k, v, ip, n.Name(), n.ID())
-						}
-					})
+					return types.InternalErrorf("failed to allocate secondary ip address (%s:%s): %v", k, v, err)
 				}
 			}
 		}
 	}
 
-	return cnl, nil
+	return nil
 }
 
 func (n *network) ipamRelease() {
@@ -894,7 +922,30 @@ func (n *network) ipamRelease() {
 		log.Warnf("Failed to retrieve ipam driver to release address pool(s) on delete of network %s (%s): %v", n.Name(), n.ID(), err)
 		return
 	}
-	for _, d := range n.ipamV4Info {
+	n.ipamReleaseVersion(4, ipam)
+	n.ipamReleaseVersion(6, ipam)
+}
+
+func (n *network) ipamReleaseVersion(ipVer int, ipam ipamapi.Ipam) {
+	var infoList []*IpamInfo
+
+	switch ipVer {
+	case 4:
+		infoList = n.ipamV4Info
+	case 6:
+		infoList = n.ipamV6Info
+	default:
+		log.Warnf("incorrect ip version passed to ipam release: %d", ipVer)
+		return
+	}
+
+	if infoList == nil {
+		return
+	}
+
+	log.Debugf("releasing IPv%d pools from network %s (%s)", ipVer, n.Name(), n.ID())
+
+	for _, d := range infoList {
 		if d.Gateway != nil {
 			if err := ipam.ReleaseAddress(d.PoolID, d.Gateway.IP); err != nil {
 				log.Warnf("Failed to release gateway ip address %s on delete of network %s (%s): %v", d.Gateway.IP, n.Name(), n.ID(), err)
@@ -915,30 +966,38 @@ func (n *network) ipamRelease() {
 	}
 }
 
-func (n *network) getIPInfo() []*IpamInfo {
-	n.Lock()
-	defer n.Unlock()
-	l := make([]*IpamInfo, 0, len(n.ipamV4Info))
-	for _, d := range n.ipamV4Info {
-		l = append(l, d)
+func (n *network) getIPInfo(ipVer int) []*IpamInfo {
+	var info []*IpamInfo
+	switch ipVer {
+	case 4:
+		info = n.ipamV4Info
+	case 6:
+		info = n.ipamV6Info
+	default:
+		return nil
 	}
-	return l
-}
-
-func (n *network) getIPv4Data() []driverapi.IPAMData {
-	l := make([]driverapi.IPAMData, 0, len(n.ipamV4Info))
+	l := make([]*IpamInfo, 0, len(info))
 	n.Lock()
-	for _, d := range n.ipamV4Info {
-		l = append(l, d.IPAMData)
+	for _, d := range info {
+		l = append(l, d)
 	}
 	n.Unlock()
 	return l
 }
 
-func (n *network) getIPv6Data() []driverapi.IPAMData {
-	l := make([]driverapi.IPAMData, 0, len(n.ipamV6Info))
+func (n *network) getIPData(ipVer int) []driverapi.IPAMData {
+	var info []*IpamInfo
+	switch ipVer {
+	case 4:
+		info = n.ipamV4Info
+	case 6:
+		info = n.ipamV6Info
+	default:
+		return nil
+	}
+	l := make([]driverapi.IPAMData, 0, len(info))
 	n.Lock()
-	for _, d := range n.ipamV6Info {
+	for _, d := range info {
 		l = append(l, d.IPAMData)
 	}
 	n.Unlock()