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Move tests from core into ipallocator

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Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Michael Crosby 2014-01-23 01:31:38 -08:00
parent 648357ffdf
commit fccca3542b
6 changed files with 378 additions and 379 deletions
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6
container.go
View file

@ -7,6 +7,7 @@ import (
"github.com/dotcloud/docker/archive"
"github.com/dotcloud/docker/execdriver"
"github.com/dotcloud/docker/graphdriver"
"github.com/dotcloud/docker/networkdriver/ipallocator"
"github.com/dotcloud/docker/pkg/mount"
"github.com/dotcloud/docker/pkg/term"
"github.com/dotcloud/docker/utils"
@ -1039,8 +1040,9 @@ func (container *Container) allocateNetwork() error {
manager: manager,
}
if iface != nil && iface.IPNet.IP != nil {
ipNum := ipToInt(iface.IPNet.IP)
manager.ipAllocator.inUse[ipNum] = struct{}{}
if _, err := ipallocator.RequestIP(manager.bridgeNetwork, &iface.IPNet.IP); err != nil {
return err
}
} else {
iface, err = container.runtime.networkManager.Allocate()
if err != nil {

115
network.go
View file

@ -1,8 +1,8 @@
package docker
import (
"errors"
"fmt"
"github.com/dotcloud/docker/networkdriver/ipallocator"
"github.com/dotcloud/docker/pkg/iptables"
"github.com/dotcloud/docker/pkg/netlink"
"github.com/dotcloud/docker/proxy"
@ -24,21 +24,6 @@ const (
siocBRADDBR = 0x89a0
)
func checkNameserverOverlaps(nameservers []string, dockerNetwork *net.IPNet) error {
if len(nameservers) > 0 {
for _, ns := range nameservers {
_, nsNetwork, err := net.ParseCIDR(ns)
if err != nil {
return err
}
if networkOverlaps(dockerNetwork, nsNetwork) {
return fmt.Errorf("%s overlaps nameserver %s", dockerNetwork, nsNetwork)
}
}
}
return nil
}
// CreateBridgeIface creates a network bridge interface on the host system with the name `ifaceName`,
// and attempts to configure it with an address which doesn't conflict with any other interface on the host.
// If it can't find an address which doesn't conflict, it will return an error.
@ -86,17 +71,16 @@ func CreateBridgeIface(config *DaemonConfig) error {
if err != nil {
return err
}
// TODO: @crosbymichael register route
if err := checkRouteOverlaps(routes, dockerNetwork); err == nil {
if err := checkNameserverOverlaps(nameservers, dockerNetwork); err == nil {
ifaceAddr = addr
break
}
if err := ipallocator.RegisterNetwork(dockerNetwork, nameservers); err == nil {
ifaceAddr = addr
break
} else {
utils.Debugf("%s: %s", addr, err)
}
}
}
if ifaceAddr == "" {
return fmt.Errorf("Could not find a free IP address range for interface '%s'. Please configure its address manually and run 'docker -b %s'", config.BridgeIface, config.BridgeIface)
}
@ -367,54 +351,6 @@ func newPortAllocator() (*PortAllocator, error) {
return allocator, nil
}
// IP allocator: Automatically allocate and release networking ports
type IPAllocator struct {
network *net.IPNet
queueAlloc chan allocatedIP
queueReleased chan net.IP
inUse map[int32]struct{}
quit chan bool
}
type allocatedIP struct {
ip net.IP
err error
}
func (alloc *IPAllocator) run() {
}
func (alloc *IPAllocator) Acquire() (net.IP, error) {
ip := <-alloc.queueAlloc
return ip.ip, ip.err
}
func (alloc *IPAllocator) Release(ip net.IP) {
alloc.queueReleased <- ip
}
func (alloc *IPAllocator) Close() error {
alloc.quit <- true
close(alloc.quit)
close(alloc.queueAlloc)
close(alloc.queueReleased)
return nil
}
func newIPAllocator(network *net.IPNet) *IPAllocator {
alloc := &IPAllocator{
network: network,
queueAlloc: make(chan allocatedIP),
queueReleased: make(chan net.IP),
inUse: make(map[int32]struct{}),
quit: make(chan bool),
}
go alloc.run()
return alloc
}
// Network interface represents the networking stack of a container
type NetworkInterface struct {
IPNet net.IPNet
@ -519,7 +455,9 @@ func (iface *NetworkInterface) Release() {
}
}
iface.manager.ipAllocator.Release(iface.IPNet.IP)
if err := ipallocator.ReleaseIP(iface.manager.bridgeNetwork, &iface.IPNet.IP); err != nil {
log.Printf("Unable to release ip %s\n", err)
}
}
// Network Manager manages a set of network interfaces
@ -528,7 +466,6 @@ type NetworkManager struct {
bridgeIface string
bridgeNetwork *net.IPNet
ipAllocator *IPAllocator
tcpPortAllocator *PortAllocator
udpPortAllocator *PortAllocator
portMapper *PortMapper
@ -543,27 +480,31 @@ func (manager *NetworkManager) Allocate() (*NetworkInterface, error) {
return &NetworkInterface{disabled: true}, nil
}
var ip net.IP
var ip *net.IP
var err error
ip, err = manager.ipAllocator.Acquire()
ip, err = ipallocator.RequestIP(manager.bridgeNetwork, nil)
if err != nil {
return nil, err
}
// avoid duplicate IP
ipNum := ipToInt(ip)
firstIP := manager.ipAllocator.network.IP.To4().Mask(manager.ipAllocator.network.Mask)
firstIPNum := ipToInt(firstIP) + 1
if firstIPNum == ipNum {
ip, err = manager.ipAllocator.Acquire()
if err != nil {
return nil, err
// TODO: @crosbymichael why are we doing this ?
/*
// avoid duplicate IP
ipNum := ipToInt(ip)
firstIP := manager.ipAllocator.network.IP.To4().Mask(manager.ipAllocator.network.Mask)
firstIPNum := ipToInt(firstIP) + 1
if firstIPNum == ipNum {
ip, err = manager.ipAllocator.Acquire()
if err != nil {
return nil, err
}
}
}
*/
iface := &NetworkInterface{
IPNet: net.IPNet{IP: ip, Mask: manager.bridgeNetwork.Mask},
IPNet: net.IPNet{IP: *ip, Mask: manager.bridgeNetwork.Mask},
Gateway: manager.bridgeNetwork.IP,
manager: manager,
}
@ -576,14 +517,13 @@ func (manager *NetworkManager) Close() error {
}
err1 := manager.tcpPortAllocator.Close()
err2 := manager.udpPortAllocator.Close()
err3 := manager.ipAllocator.Close()
if err1 != nil {
return err1
}
if err2 != nil {
return err2
}
return err3
return nil
}
func newNetworkManager(config *DaemonConfig) (*NetworkManager, error) {
@ -670,8 +610,6 @@ func newNetworkManager(config *DaemonConfig) (*NetworkManager, error) {
}
}
ipAllocator := newIPAllocator(network)
tcpPortAllocator, err := newPortAllocator()
if err != nil {
return nil, err
@ -690,7 +628,6 @@ func newNetworkManager(config *DaemonConfig) (*NetworkManager, error) {
manager := &NetworkManager{
bridgeIface: config.BridgeIface,
bridgeNetwork: network,
ipAllocator: ipAllocator,
tcpPortAllocator: tcpPortAllocator,
udpPortAllocator: udpPortAllocator,
portMapper: portMapper,

273
network_test.go
View file

@ -2,9 +2,7 @@ package docker
import (
"github.com/dotcloud/docker/pkg/iptables"
"github.com/dotcloud/docker/pkg/netlink"
"github.com/dotcloud/docker/proxy"
"net"
"testing"
)
@ -53,277 +51,6 @@ func TestPortAllocation(t *testing.T) {
}
}
func TestNetworkRange(t *testing.T) {
// Simple class C test
_, network, _ := net.ParseCIDR("192.168.0.1/24")
first, last := networkRange(network)
if !first.Equal(net.ParseIP("192.168.0.0")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("192.168.0.255")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 256 {
t.Error(size)
}
// Class A test
_, network, _ = net.ParseCIDR("10.0.0.1/8")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.0.0.0")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.255.255.255")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 16777216 {
t.Error(size)
}
// Class A, random IP address
_, network, _ = net.ParseCIDR("10.1.2.3/8")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.0.0.0")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.255.255.255")) {
t.Error(last.String())
}
// 32bit mask
_, network, _ = net.ParseCIDR("10.1.2.3/32")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.1.2.3")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.1.2.3")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 1 {
t.Error(size)
}
// 31bit mask
_, network, _ = net.ParseCIDR("10.1.2.3/31")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.1.2.2")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.1.2.3")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 2 {
t.Error(size)
}
// 26bit mask
_, network, _ = net.ParseCIDR("10.1.2.3/26")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.1.2.0")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.1.2.63")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 64 {
t.Error(size)
}
}
func TestConversion(t *testing.T) {
ip := net.ParseIP("127.0.0.1")
i := ipToInt(ip)
if i == 0 {
t.Fatal("converted to zero")
}
conv := intToIP(i)
if !ip.Equal(conv) {
t.Error(conv.String())
}
}
func TestIPAllocator(t *testing.T) {
expectedIPs := []net.IP{
0: net.IPv4(127, 0, 0, 2),
1: net.IPv4(127, 0, 0, 3),
2: net.IPv4(127, 0, 0, 4),
3: net.IPv4(127, 0, 0, 5),
4: net.IPv4(127, 0, 0, 6),
}
gwIP, n, _ := net.ParseCIDR("127.0.0.1/29")
alloc := newIPAllocator(&net.IPNet{IP: gwIP, Mask: n.Mask})
// Pool after initialisation (f = free, u = used)
// 2(f) - 3(f) - 4(f) - 5(f) - 6(f)
// ↑
// Check that we get 5 IPs, from 127.0.0.2–127.0.0.6, in that
// order.
for i := 0; i < 5; i++ {
ip, err := alloc.Acquire()
if err != nil {
t.Fatal(err)
}
assertIPEquals(t, expectedIPs[i], ip)
}
// Before loop begin
// 2(f) - 3(f) - 4(f) - 5(f) - 6(f)
// ↑
// After i = 0
// 2(u) - 3(f) - 4(f) - 5(f) - 6(f)
// ↑
// After i = 1
// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
// ↑
// After i = 2
// 2(u) - 3(u) - 4(u) - 5(f) - 6(f)
// ↑
// After i = 3
// 2(u) - 3(u) - 4(u) - 5(u) - 6(f)
// ↑
// After i = 4
// 2(u) - 3(u) - 4(u) - 5(u) - 6(u)
// ↑
// Check that there are no more IPs
_, err := alloc.Acquire()
if err == nil {
t.Fatal("There shouldn't be any IP addresses at this point")
}
// Release some IPs in non-sequential order
alloc.Release(expectedIPs[3])
// 2(u) - 3(u) - 4(u) - 5(f) - 6(u)
// ↑
alloc.Release(expectedIPs[2])
// 2(u) - 3(u) - 4(f) - 5(f) - 6(u)
// ↑
alloc.Release(expectedIPs[4])
// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
// ↑
// Make sure that IPs are reused in sequential order, starting
// with the first released IP
newIPs := make([]net.IP, 3)
for i := 0; i < 3; i++ {
ip, err := alloc.Acquire()
if err != nil {
t.Fatal(err)
}
newIPs[i] = ip
}
// Before loop begin
// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
// ↑
// After i = 0
// 2(u) - 3(u) - 4(f) - 5(u) - 6(f)
// ↑
// After i = 1
// 2(u) - 3(u) - 4(f) - 5(u) - 6(u)
// ↑
// After i = 2
// 2(u) - 3(u) - 4(u) - 5(u) - 6(u)
// ↑
assertIPEquals(t, expectedIPs[3], newIPs[0])
assertIPEquals(t, expectedIPs[4], newIPs[1])
assertIPEquals(t, expectedIPs[2], newIPs[2])
_, err = alloc.Acquire()
if err == nil {
t.Fatal("There shouldn't be any IP addresses at this point")
}
}
func assertIPEquals(t *testing.T, ip1, ip2 net.IP) {
if !ip1.Equal(ip2) {
t.Fatalf("Expected IP %s, got %s", ip1, ip2)
}
}
func AssertOverlap(CIDRx string, CIDRy string, t *testing.T) {
_, netX, _ := net.ParseCIDR(CIDRx)
_, netY, _ := net.ParseCIDR(CIDRy)
if !networkOverlaps(netX, netY) {
t.Errorf("%v and %v should overlap", netX, netY)
}
}
func AssertNoOverlap(CIDRx string, CIDRy string, t *testing.T) {
_, netX, _ := net.ParseCIDR(CIDRx)
_, netY, _ := net.ParseCIDR(CIDRy)
if networkOverlaps(netX, netY) {
t.Errorf("%v and %v should not overlap", netX, netY)
}
}
func TestNetworkOverlaps(t *testing.T) {
//netY starts at same IP and ends within netX
AssertOverlap("172.16.0.1/24", "172.16.0.1/25", t)
//netY starts within netX and ends at same IP
AssertOverlap("172.16.0.1/24", "172.16.0.128/25", t)
//netY starts and ends within netX
AssertOverlap("172.16.0.1/24", "172.16.0.64/25", t)
//netY starts at same IP and ends outside of netX
AssertOverlap("172.16.0.1/24", "172.16.0.1/23", t)
//netY starts before and ends at same IP of netX
AssertOverlap("172.16.1.1/24", "172.16.0.1/23", t)
//netY starts before and ends outside of netX
AssertOverlap("172.16.1.1/24", "172.16.0.1/23", t)
//netY starts and ends before netX
AssertNoOverlap("172.16.1.1/25", "172.16.0.1/24", t)
//netX starts and ends before netY
AssertNoOverlap("172.16.1.1/25", "172.16.2.1/24", t)
}
func TestCheckRouteOverlaps(t *testing.T) {
routesData := []string{"10.0.2.0/32", "10.0.3.0/24", "10.0.42.0/24", "172.16.42.0/24", "192.168.142.0/24"}
routes := []netlink.Route{}
for _, addr := range routesData {
_, netX, _ := net.ParseCIDR(addr)
routes = append(routes, netlink.Route{IPNet: netX})
}
_, netX, _ := net.ParseCIDR("172.16.0.1/24")
if err := checkRouteOverlaps(routes, netX); err != nil {
t.Fatal(err)
}
_, netX, _ = net.ParseCIDR("10.0.2.0/24")
if err := checkRouteOverlaps(routes, netX); err == nil {
t.Fatalf("10.0.2.0/24 and 10.0.2.0 should overlap but it doesn't")
}
}
func TestCheckNameserverOverlaps(t *testing.T) {
nameservers := []string{"10.0.2.3/32", "192.168.102.1/32"}
_, netX, _ := net.ParseCIDR("10.0.2.3/32")
if err := checkNameserverOverlaps(nameservers, netX); err == nil {
t.Fatalf("%s should overlap 10.0.2.3/32 but doesn't", netX)
}
_, netX, _ = net.ParseCIDR("192.168.102.2/32")
if err := checkNameserverOverlaps(nameservers, netX); err != nil {
t.Fatalf("%s should not overlap %v but it does", netX, nameservers)
}
}
type StubProxy struct {
frontendAddr *net.Addr
backendAddr *net.Addr

33
networkdriver/ipallocator/allocator.go
View file

@ -16,20 +16,25 @@ type iPNet struct {
}
var (
ErrNetworkAlreadyAllocated = errors.New("requested network overlaps with existing network")
ErrNetworkAlreadyRegisterd = errors.New("requested network is already registered")
ErrNoAvailableIps = errors.New("no available ips on network")
ErrIPAlreadyAllocated = errors.New("ip already allocated")
ErrNetworkAlreadyAllocated = errors.New("requested network overlaps with existing network")
ErrNetworkAlreadyRegisterd = errors.New("requested network is already registered")
ErrNetworkOverlapsWithNameservers = errors.New("requested network overlaps with nameserver")
ErrNoAvailableIps = errors.New("no available ips on network")
ErrIPAlreadyAllocated = errors.New("ip already allocated")
lock = sync.Mutex{}
allocatedIPs = networkSet{}
availableIPS = networkSet{}
)
func RegisterNetwork(network *net.IPNet) error {
func RegisterNetwork(network *net.IPNet, nameservers []string) error {
lock.Lock()
defer lock.Unlock()
if err := checkExistingNetworkOverlaps(network); err != nil {
return err
}
routes, err := netlink.NetworkGetRoutes()
if err != nil {
return err
@ -39,9 +44,10 @@ func RegisterNetwork(network *net.IPNet) error {
return err
}
if err := checkExistingNetworkOverlaps(network); err != nil {
if err := checkNameserverOverlaps(nameservers, network); err != nil {
return err
}
n := newIPNet(network)
allocatedIPs[n] = &iPSet{}
@ -227,3 +233,18 @@ func networkSize(mask net.IPMask) int32 {
return int32(binary.BigEndian.Uint32(m)) + 1
}
func checkNameserverOverlaps(nameservers []string, toCheck *net.IPNet) error {
if len(nameservers) > 0 {
for _, ns := range nameservers {
_, nsNetwork, err := net.ParseCIDR(ns)
if err != nil {
return err
}
if networkOverlaps(toCheck, nsNetwork) {
return ErrNetworkOverlapsWithNameservers
}
}
}
return nil
}

329
networkdriver/ipallocator/allocator_test.go
View file

@ -2,6 +2,7 @@ package ipallocator
import (
"fmt"
"github.com/dotcloud/docker/pkg/netlink"
"net"
"testing"
)
@ -18,7 +19,7 @@ func TestRegisterNetwork(t *testing.T) {
Mask: []byte{255, 255, 255, 0},
}
if err := RegisterNetwork(network); err != nil {
if err := RegisterNetwork(network, nil); err != nil {
t.Fatal(err)
}
@ -39,7 +40,7 @@ func TestRegisterTwoNetworks(t *testing.T) {
Mask: []byte{255, 255, 255, 0},
}
if err := RegisterNetwork(network); err != nil {
if err := RegisterNetwork(network, nil); err != nil {
t.Fatal(err)
}
@ -48,7 +49,7 @@ func TestRegisterTwoNetworks(t *testing.T) {
Mask: []byte{255, 255, 255, 0},
}
if err := RegisterNetwork(network2); err != nil {
if err := RegisterNetwork(network2, nil); err != nil {
t.Fatal(err)
}
}
@ -60,11 +61,11 @@ func TestRegisterNetworkThatExists(t *testing.T) {
Mask: []byte{255, 255, 255, 0},
}
if err := RegisterNetwork(network); err != nil {
if err := RegisterNetwork(network, nil); err != nil {
t.Fatal(err)
}
if err := RegisterNetwork(network); err != ErrNetworkAlreadyRegisterd {
if err := RegisterNetwork(network, nil); err != ErrNetworkAlreadyRegisterd {
t.Fatalf("Expected error of %s got %s", ErrNetworkAlreadyRegisterd, err)
}
}
@ -76,7 +77,7 @@ func TestRequestNewIps(t *testing.T) {
Mask: []byte{255, 255, 255, 0},
}
if err := RegisterNetwork(network); err != nil {
if err := RegisterNetwork(network, nil); err != nil {
t.Fatal(err)
}
@ -99,7 +100,7 @@ func TestReleaseIp(t *testing.T) {
Mask: []byte{255, 255, 255, 0},
}
if err := RegisterNetwork(network); err != nil {
if err := RegisterNetwork(network, nil); err != nil {
t.Fatal(err)
}
@ -120,7 +121,7 @@ func TestGetReleasedIp(t *testing.T) {
Mask: []byte{255, 255, 255, 0},
}
if err := RegisterNetwork(network); err != nil {
if err := RegisterNetwork(network, nil); err != nil {
t.Fatal(err)
}
@ -151,7 +152,7 @@ func TestRequesetSpecificIp(t *testing.T) {
Mask: []byte{255, 255, 255, 0},
}
if err := RegisterNetwork(network); err != nil {
if err := RegisterNetwork(network, nil); err != nil {
t.Fatal(err)
}
@ -161,3 +162,313 @@ func TestRequesetSpecificIp(t *testing.T) {
t.Fatal(err)
}
}
func TestNonOverlapingNameservers(t *testing.T) {
defer reset()
network := &net.IPNet{
IP: []byte{192, 168, 0, 1},
Mask: []byte{255, 255, 255, 0},
}
nameservers := []string{
"127.0.0.1/32",
}
if err := RegisterNetwork(network, nameservers); err != nil {
t.Fatal(err)
}
}
func TestOverlapingNameservers(t *testing.T) {
defer reset()
network := &net.IPNet{
IP: []byte{192, 168, 0, 1},
Mask: []byte{255, 255, 255, 0},
}
nameservers := []string{
"192.168.0.1/32",
}
if err := RegisterNetwork(network, nameservers); err != ErrNetworkOverlapsWithNameservers {
t.Fatalf("Expectecd error of %s got %s", ErrNetworkOverlapsWithNameservers, err)
}
}
func TestNetworkRange(t *testing.T) {
// Simple class C test
_, network, _ := net.ParseCIDR("192.168.0.1/24")
first, last := networkRange(network)
if !first.Equal(net.ParseIP("192.168.0.0")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("192.168.0.255")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 256 {
t.Error(size)
}
// Class A test
_, network, _ = net.ParseCIDR("10.0.0.1/8")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.0.0.0")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.255.255.255")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 16777216 {
t.Error(size)
}
// Class A, random IP address
_, network, _ = net.ParseCIDR("10.1.2.3/8")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.0.0.0")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.255.255.255")) {
t.Error(last.String())
}
// 32bit mask
_, network, _ = net.ParseCIDR("10.1.2.3/32")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.1.2.3")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.1.2.3")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 1 {
t.Error(size)
}
// 31bit mask
_, network, _ = net.ParseCIDR("10.1.2.3/31")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.1.2.2")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.1.2.3")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 2 {
t.Error(size)
}
// 26bit mask
_, network, _ = net.ParseCIDR("10.1.2.3/26")
first, last = networkRange(network)
if !first.Equal(net.ParseIP("10.1.2.0")) {
t.Error(first.String())
}
if !last.Equal(net.ParseIP("10.1.2.63")) {
t.Error(last.String())
}
if size := networkSize(network.Mask); size != 64 {
t.Error(size)
}
}
func TestConversion(t *testing.T) {
ip := net.ParseIP("127.0.0.1")
i := ipToInt(&ip)
if i == 0 {
t.Fatal("converted to zero")
}
conv := intToIP(i)
if !ip.Equal(*conv) {
t.Error(conv.String())
}
}
func TestIPAllocator(t *testing.T) {
expectedIPs := []net.IP{
0: net.IPv4(127, 0, 0, 2),
1: net.IPv4(127, 0, 0, 3),
2: net.IPv4(127, 0, 0, 4),
3: net.IPv4(127, 0, 0, 5),
4: net.IPv4(127, 0, 0, 6),
}
gwIP, n, _ := net.ParseCIDR("127.0.0.1/29")
network := &net.IPNet{IP: gwIP, Mask: n.Mask}
if err := RegisterNetwork(network, nil); err != nil {
t.Fatal(err)
}
// Pool after initialisation (f = free, u = used)
// 2(f) - 3(f) - 4(f) - 5(f) - 6(f)
// ↑
// Check that we get 5 IPs, from 127.0.0.2–127.0.0.6, in that
// order.
for i := 0; i < 5; i++ {
ip, err := RequestIP(network, nil)
if err != nil {
t.Fatal(err)
}
assertIPEquals(t, &expectedIPs[i], ip)
}
// Before loop begin
// 2(f) - 3(f) - 4(f) - 5(f) - 6(f)
// ↑
// After i = 0
// 2(u) - 3(f) - 4(f) - 5(f) - 6(f)
// ↑
// After i = 1
// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
// ↑
// After i = 2
// 2(u) - 3(u) - 4(u) - 5(f) - 6(f)
// ↑
// After i = 3
// 2(u) - 3(u) - 4(u) - 5(u) - 6(f)
// ↑
// After i = 4
// 2(u) - 3(u) - 4(u) - 5(u) - 6(u)
// ↑
// Check that there are no more IPs
ip, err := RequestIP(network, nil)
if err == nil {
t.Fatalf("There shouldn't be any IP addresses at this point, got %s\n", ip)
}
// Release some IPs in non-sequential order
if err := ReleaseIP(network, &expectedIPs[3]); err != nil {
t.Fatal(err)
}
// 2(u) - 3(u) - 4(u) - 5(f) - 6(u)
// ↑
if err := ReleaseIP(network, &expectedIPs[2]); err != nil {
t.Fatal(err)
}
// 2(u) - 3(u) - 4(f) - 5(f) - 6(u)
// ↑
if err := ReleaseIP(network, &expectedIPs[4]); err != nil {
t.Fatal(err)
}
// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
// ↑
// Make sure that IPs are reused in sequential order, starting
// with the first released IP
newIPs := make([]*net.IP, 3)
for i := 0; i < 3; i++ {
ip, err := RequestIP(network, nil)
if err != nil {
t.Fatal(err)
}
newIPs[i] = ip
}
// Before loop begin
// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
// ↑
// After i = 0
// 2(u) - 3(u) - 4(f) - 5(u) - 6(f)
// ↑
// After i = 1
// 2(u) - 3(u) - 4(f) - 5(u) - 6(u)
// ↑
// After i = 2
// 2(u) - 3(u) - 4(u) - 5(u) - 6(u)
// ↑
assertIPEquals(t, &expectedIPs[3], newIPs[0])
assertIPEquals(t, &expectedIPs[4], newIPs[1])
assertIPEquals(t, &expectedIPs[2], newIPs[2])
_, err = RequestIP(network, nil)
if err == nil {
t.Fatal("There shouldn't be any IP addresses at this point")
}
}
func assertIPEquals(t *testing.T, ip1, ip2 *net.IP) {
if !ip1.Equal(*ip2) {
t.Fatalf("Expected IP %s, got %s", ip1, ip2)
}
}
func AssertOverlap(CIDRx string, CIDRy string, t *testing.T) {
_, netX, _ := net.ParseCIDR(CIDRx)
_, netY, _ := net.ParseCIDR(CIDRy)
if !networkOverlaps(netX, netY) {
t.Errorf("%v and %v should overlap", netX, netY)
}
}
func AssertNoOverlap(CIDRx string, CIDRy string, t *testing.T) {
_, netX, _ := net.ParseCIDR(CIDRx)
_, netY, _ := net.ParseCIDR(CIDRy)
if networkOverlaps(netX, netY) {
t.Errorf("%v and %v should not overlap", netX, netY)
}
}
func TestNetworkOverlaps(t *testing.T) {
//netY starts at same IP and ends within netX
AssertOverlap("172.16.0.1/24", "172.16.0.1/25", t)
//netY starts within netX and ends at same IP
AssertOverlap("172.16.0.1/24", "172.16.0.128/25", t)
//netY starts and ends within netX
AssertOverlap("172.16.0.1/24", "172.16.0.64/25", t)
//netY starts at same IP and ends outside of netX
AssertOverlap("172.16.0.1/24", "172.16.0.1/23", t)
//netY starts before and ends at same IP of netX
AssertOverlap("172.16.1.1/24", "172.16.0.1/23", t)
//netY starts before and ends outside of netX
AssertOverlap("172.16.1.1/24", "172.16.0.1/23", t)
//netY starts and ends before netX
AssertNoOverlap("172.16.1.1/25", "172.16.0.1/24", t)
//netX starts and ends before netY
AssertNoOverlap("172.16.1.1/25", "172.16.2.1/24", t)
}
func TestCheckRouteOverlaps(t *testing.T) {
routesData := []string{"10.0.2.0/32", "10.0.3.0/24", "10.0.42.0/24", "172.16.42.0/24", "192.168.142.0/24"}
routes := []netlink.Route{}
for _, addr := range routesData {
_, netX, _ := net.ParseCIDR(addr)
routes = append(routes, netlink.Route{IPNet: netX})
}
_, netX, _ := net.ParseCIDR("172.16.0.1/24")
if err := checkRouteOverlaps(routes, netX); err != nil {
t.Fatal(err)
}
_, netX, _ = net.ParseCIDR("10.0.2.0/24")
if err := checkRouteOverlaps(routes, netX); err == nil {
t.Fatalf("10.0.2.0/24 and 10.0.2.0 should overlap but it doesn't")
}
}
func TestCheckNameserverOverlaps(t *testing.T) {
nameservers := []string{"10.0.2.3/32", "192.168.102.1/32"}
_, netX, _ := net.ParseCIDR("10.0.2.3/32")
if err := checkNameserverOverlaps(nameservers, netX); err == nil {
t.Fatalf("%s should overlap 10.0.2.3/32 but doesn't", netX)
}
_, netX, _ = net.ParseCIDR("192.168.102.2/32")
if err := checkNameserverOverlaps(nameservers, netX); err != nil {
t.Fatalf("%s should not overlap %v but it does", netX, nameservers)
}
}

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networkdriver/network.go Normal file
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package networkdriver