func GetPort(address net.IP) string {
if address.Equal(net.IPv4(127, 0, 0, 1)) {
return ":8000" //It would be silly to do something funny on your own computer
}
port := ComputeHash(address)
return ":" + strconv.Itoa(port)
}
// NewProxier returns a new Proxier given a LoadBalancer and an address on
// which to listen. Because of the iptables logic, It is assumed that there
// is only a single Proxier active on a machine.
func NewProxier(loadBalancer LoadBalancer, listenIP net.IP, iptables iptables.Interface) *Proxier {
if listenIP.Equal(localhostIPv4) || listenIP.Equal(localhostIPv6) {
glog.Errorf("Can't proxy only on localhost - iptables can't do it")
return nil
}
hostIP, err := chooseHostInterface()
if err != nil {
glog.Errorf("Failed to select a host interface: %v", err)
return nil
}
glog.Infof("Initializing iptables")
// Clean up old messes. Ignore erors.
iptablesDeleteOld(iptables)
// Set up the iptables foundations we need.
if err := iptablesInit(iptables); err != nil {
glog.Errorf("Failed to initialize iptables: %v", err)
return nil
}
// Flush old iptables rules (since the bound ports will be invalid after a restart).
// When OnUpdate() is first called, the rules will be recreated.
if err := iptablesFlush(iptables); err != nil {
glog.Errorf("Failed to flush iptables: %v", err)
return nil
}
return &Proxier{
loadBalancer: loadBalancer,
serviceMap: make(map[string]*serviceInfo),
listenIP: listenIP,
iptables: iptables,
hostIP: hostIP,
}
}
// Validate given node IP belongs to the current host
func (kl *Kubelet) validateNodeIP() error {
if kl.nodeIP == nil {
return nil
}
// Honor IP limitations set in setNodeStatus()
if kl.nodeIP.IsLoopback() {
return fmt.Errorf("nodeIP can't be loopback address")
}
if kl.nodeIP.To4() == nil {
return fmt.Errorf("nodeIP must be IPv4 address")
}
addrs, err := net.InterfaceAddrs()
if err != nil {
return err
}
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if ip != nil && ip.Equal(kl.nodeIP) {
return nil
}
}
return fmt.Errorf("Node IP: %q not found in the host's network interfaces", kl.nodeIP.String())
}
func ipIsLocal(ip net.IP) bool {
if ip.To4() == nil {
return ip.Equal(net.IPv6loopback)
}
return v4Loopback.Contains(ip)
}
func (c *EtcdConfig) verifyIP(ip net.IP, source string) {
fmt.Printf("IP '%s' found in '%s'\n", ip.String(), source)
// valid ip address found from source. Verify that it exists
if iface, ip_net, ipverify, err := LocalNetForIp(ip); err != nil {
fmt.Printf("%s\n", err.Error())
} else if !ip.Equal(ipverify) {
fmt.Printf("IP address on interface %s: %s does not match ip from %s: %s\n",
iface.Name, ipverify, c.AddrSource, ip)
} else {
fmt.Printf("IP '%s' verified, on interface '%s' net '%s'\n",
ip.String(), iface.Name, ip_net.String())
set := false
// set local defaults appropriately
if c.ClientAddr == "" {
c.ClientAddr = ip.String()
set = true
}
if c.PeerAddr == "" {
c.PeerAddr = ip.String()
set = true
}
if set {
c.Interface = iface
}
}
}
func (rb *HostgwBackend) Init(extIface *net.Interface, extIaddr net.IP, extEaddr net.IP) (*backend.SubnetDef, error) {
rb.extIface = extIface
rb.extIaddr = extIaddr
if !extIaddr.Equal(extEaddr) {
return nil, fmt.Errorf("your PublicIP differs from interface IP, meaning that probably you're on a NAT, which is not supported by host-gw backend")
}
attrs := subnet.LeaseAttrs{
PublicIP: ip.FromIP(extIaddr),
BackendType: "host-gw",
}
l, err := rb.sm.AcquireLease(rb.ctx, rb.network, &attrs)
switch err {
case nil:
rb.lease = l
case context.Canceled, context.DeadlineExceeded:
return nil, err
default:
return nil, fmt.Errorf("failed to acquire lease: %v", err)
}
/* NB: docker will create the local route to `sn` */
return &backend.SubnetDef{
Net: l.Subnet,
MTU: extIface.MTU,
}, nil
}
// Build a slice of iptables args for a portal rule.
func iptablesPortalArgs(destIP net.IP, destPort int, protocol api.Protocol, proxyIP net.IP, proxyPort int, service string) []string {
args := []string{
"-m", "comment",
"--comment", service,
"-p", strings.ToLower(string(protocol)),
"-d", destIP.String(),
"--dport", fmt.Sprintf("%d", destPort),
}
// This is tricky. If the proxy is bound (see Proxier.listenAddress)
// to 0.0.0.0 ("any interface") or 127.0.0.1, we can use REDIRECT,
// which will bring packets back to the host's loopback interface. If
// the proxy is bound to any other interface, then it is not listening
// on the hosts's loopback, so we have to use DNAT to that specific
// IP. We can not simply use DNAT to 127.0.0.1 in the first case
// because from within a container, 127.0.0.1 is the container's
// loopback interface, not the host's.
//
// Why would anyone bind to an address that is not inclusive of
// localhost? Apparently some cloud environments have their public IP
// exposed as a real network interface AND do not have firewalling. We
// don't want to expose everything out to the world.
//
// Unfortunately, I don't know of any way to listen on some (N > 1)
// interfaces but not ALL interfaces, short of doing it manually, and
// this is simpler than that.
if proxyIP.Equal(zeroIP) || proxyIP.Equal(localhostIP) {
args = append(args, "-j", "REDIRECT", "--to-ports", fmt.Sprintf("%d", proxyPort))
} else {
args = append(args, "-j", "DNAT", "--to-destination", fmt.Sprintf("%s:%d", proxyIP.String(), proxyPort))
}
return args
}
func buildDirectors(gDirects string) []directorFunc {
// Generates a list of directorFuncs that are have "cached" values within
// the scope of the functions.
directorCidrs := strings.Split(gDirects, ",")
directorFuncs := make([]directorFunc, len(directorCidrs))
for idx, directorCidr := range directorCidrs {
//dstring := director
var dfunc directorFunc
if strings.Contains(directorCidr, "/") {
_, directorIpNet, err := net.ParseCIDR(directorCidr)
if err != nil {
panic(fmt.Sprintf("\nUnable to parse CIDR string : %s : %s\n", directorCidr, err))
}
dfunc = func(ptestip *net.IP) bool {
testIp := *ptestip
return directorIpNet.Contains(testIp)
}
directorFuncs[idx] = dfunc
} else {
var directorIp net.IP
directorIp = net.ParseIP(directorCidr)
dfunc = func(ptestip *net.IP) bool {
var testIp net.IP
testIp = *ptestip
return testIp.Equal(directorIp)
}
directorFuncs[idx] = dfunc
}
}
return directorFuncs
}
// Build a slice of iptables args for a from-host portal rule.
func (proxier *Proxier) iptablesHostPortalArgs(destIP net.IP, addDstLocalMatch bool, destPort int, protocol api.Protocol, proxyIP net.IP, proxyPort int, service proxy.ServicePortName) []string {
args := iptablesCommonPortalArgs(destIP, false, addDstLocalMatch, destPort, protocol, service)
// This is tricky.
//
// If the proxy is bound (see Proxier.listenIP) to 0.0.0.0 ("any
// interface") we want to do the same as from-container traffic and use
// REDIRECT. Except that it doesn't work (empirically). REDIRECT on
// local packets sends the traffic to localhost (special case, but it is
// documented) but the response comes from the eth0 IP (not sure why,
// truthfully), which makes DNS unhappy.
//
// So we have to use DNAT. DNAT to 127.0.0.1 can't work for the same
// reason.
//
// So we do our best to find an interface that is not a loopback and
// DNAT to that. This works (again, empirically).
//
// If the proxy is bound to a specific IP, then we have to use DNAT to
// that IP. Unlike the previous case, this works because the proxy is
// ONLY listening on that IP, not the bridge.
//
// If the proxy is bound to localhost only, this should work, but we
// don't allow it for now.
if proxyIP.Equal(zeroIPv4) || proxyIP.Equal(zeroIPv6) {
proxyIP = proxier.hostIP
}
// TODO: Can we DNAT with IPv6?
args = append(args, "-j", "DNAT", "--to-destination", net.JoinHostPort(proxyIP.String(), strconv.Itoa(proxyPort)))
return args
}
func HardwareAddrByIP(x net.IP) (*net.HardwareAddr, error) {
file, err := os.Open("/proc/net/arp")
if err != nil {
return nil, err
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
fields := strings.Fields(scanner.Text())
if x.Equal(net.ParseIP(fields[0])) {
addr, err := net.ParseMAC(fields[3])
if err != nil {
continue
}
return &addr, nil
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
return nil, errors.New("no mac address found")
}
func netIP4ToInterface(ip net.IP) (*net.Interface, error) {
ift, err := net.Interfaces()
if err != nil {
return nil, err
}
for _, ifi := range ift {
ifat, err := ifi.Addrs()
if err != nil {
return nil, err
}
for _, ifa := range ifat {
switch ifa := ifa.(type) {
case *net.IPAddr:
if ip.Equal(ifa.IP) {
return &ifi, nil
}
case *net.IPNet:
if ip.Equal(ifa.IP) {
return &ifi, nil
}
}
}
}
return nil, errNoSuchInterface
}
func InterfaceByIP(x net.IP) (*net.Interface, error) {
ifaces, err := net.Interfaces()
if err != nil {
return nil, err
}
for _, iface := range ifaces {
addrs, err := iface.Addrs()
if err != nil {
continue
}
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if x.Equal(ip.To4()) {
return &iface, nil
}
}
}
return nil, errors.New("no such network interface")
}
func TestInetCidrTranscodeIP(t *testing.T) {
t.Parallel()
conn := mustConnect(t, *defaultConnConfig)
defer closeConn(t, conn)
tests := []struct {
sql string
value net.IP
}{
{"select $1::inet", net.ParseIP("0.0.0.0")},
{"select $1::inet", net.ParseIP("127.0.0.1")},
{"select $1::inet", net.ParseIP("12.34.56.0")},
{"select $1::inet", net.ParseIP("255.255.255.255")},
{"select $1::inet", net.ParseIP("::1")},
{"select $1::inet", net.ParseIP("2607:f8b0:4009:80b::200e")},
{"select $1::cidr", net.ParseIP("0.0.0.0")},
{"select $1::cidr", net.ParseIP("127.0.0.1")},
{"select $1::cidr", net.ParseIP("12.34.56.0")},
{"select $1::cidr", net.ParseIP("255.255.255.255")},
{"select $1::cidr", net.ParseIP("::1")},
{"select $1::cidr", net.ParseIP("2607:f8b0:4009:80b::200e")},
}
for i, tt := range tests {
var actual net.IP
err := conn.QueryRow(tt.sql, tt.value).Scan(&actual)
if err != nil {
t.Errorf("%d. Unexpected failure: %v (sql -> %v, value -> %v)", i, err, tt.sql, tt.value)
continue
}
if !actual.Equal(tt.value) {
t.Errorf("%d. Expected %v, got %v (sql -> %v)", i, tt.value, actual, tt.sql)
}
ensureConnValid(t, conn)
}
failTests := []struct {
sql string
value net.IPNet
}{
{"select $1::inet", mustParseCIDR(t, "192.168.1.0/24")},
{"select $1::cidr", mustParseCIDR(t, "192.168.1.0/24")},
}
for i, tt := range failTests {
var actual net.IP
err := conn.QueryRow(tt.sql, tt.value).Scan(&actual)
if !strings.Contains(err.Error(), "Cannot decode netmask") {
t.Errorf("%d. Expected failure cannot decode netmask, but got: %v (sql -> %v, value -> %v)", i, err, tt.sql, tt.value)
continue
}
ensureConnValid(t, conn)
}
}
func (v *ripVrf) nexthopGet(prefix *net.IPNet, nexthop net.IP) (int, *ripNet) {
for i, n := range v.nets {
if nexthop.Equal(n.nexthop) == addr.NetEqual(prefix, &n.addr) {
return i, n
}
}
return -1, nil
}
func ipInSlice(needle net.IP, haystack []net.IP) bool {
for _, straw := range haystack {
if needle.Equal(straw) {
return true
}
}
return false
}
func (i *Ipam) ReleaseAddress(poolID string, address net.IP) error {
i.logReq("ReleaseAddress", poolID, address)
if subnet, _, err := splitPoolID(poolID); err != nil {
return err
} else if address.Equal(subnet.IP) { // is it the gateway address we faked earlier?
return nil
}
return i.weave.ReleaseIPsFor(address.String())
}
// Build a slice of iptables args for a from-host public-port rule.
// See iptablesHostPortalArgs
// TODO: Should we just reuse iptablesHostPortalArgs?
func (proxier *Proxier) iptablesHostNodePortArgs(nodePort int, protocol api.Protocol, proxyIP net.IP, proxyPort int, service proxy.ServicePortName) []string {
args := iptablesCommonPortalArgs(nil, false, false, nodePort, protocol, service)
if proxyIP.Equal(zeroIPv4) || proxyIP.Equal(zeroIPv6) {
proxyIP = proxier.hostIP
}
// TODO: Can we DNAT with IPv6?
args = append(args, "-j", "DNAT", "--to-destination", net.JoinHostPort(proxyIP.String(), strconv.Itoa(proxyPort)))
return args
}
func InterfaceForAddr(addr net.Addr) *Interface {
var ip net.IP
if ipAddr, ok := addr.(*net.IPNet); ok {
ip = ipAddr.IP
} else if tcpAddr, ok := addr.(*net.TCPAddr); ok {
ip = tcpAddr.IP
} else {
return nil
}
ifaces, err := net.Interfaces()
if err != nil {
return nil
}
var ibIface *Interface
for i := range ifaces {
iface := &ifaces[i]
// hack until ifi_type in ifinfomsg is available in Go
if len(iface.HardwareAddr) != 20 {
continue
}
guidKey := string([]byte(iface.HardwareAddr[12:]))
var ok bool
ibIface, ok = guidToInterface[guidKey]
if !ok || iface == nil {
continue
}
ifaceAddrs, err := iface.Addrs()
if err != nil || len(ifaceAddrs) == 0 {
continue
}
found := false
for _, ifaceAddr := range ifaceAddrs {
ifaceIPNet := ifaceAddr.(*net.IPNet)
if ifaceIPNet.IP.To4() == nil {
continue
}
if ip.Equal(ifaceIPNet.IP) {
found = true
break
}
}
if found {
break
} else {
ibIface = nil
}
}
return ibIface
}
func IpsEqual(ip1 net.IP, ip2 net.IP) bool {
if ip1.Equal(ip2) {
return true
}
/* the go std library Equal doesn't recognize [::] == 0.0.0.0, since it
* tests for the ipv4 prefix, which isn't present in [::]. However,
* they are in fact equal. Let's test for this case too.
*/
return isZeroIP(ip1) && isZeroIP(ip2)
}
func splitRange(parentRange *ip.Range, firstIP net.IP, lastIP net.IP) (before, reserved, after *ip.Range) {
if !firstIP.Equal(parentRange.FirstIP) {
before = ip.NewRange(parentRange.FirstIP, decrementIP4(firstIP))
}
if !lastIP.Equal(parentRange.LastIP) {
after = ip.NewRange(incrementIP4(lastIP), parentRange.LastIP)
}
reserved = ip.NewRange(firstIP, lastIP)
return
}
func (c *con) GetListenAddresses() (addresses []*net.UDPAddr) {
addresses = make([]*net.UDPAddr, 0)
select {
case <-c.done:
return
default:
}
port := c.Port
interfaces := util.GetUnicastInterfaces()
ips := make([]net.IP, 0)
for _, ifc := range interfaces {
addrs, err := ifc.Addrs()
if err != nil {
c.Warnf("Error getting addresses from interface (%v): %v", ifc, err)
continue
}
for _, a := range addrs {
var ip net.IP
switch v := a.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
default:
continue
}
if ip.To4() == nil {
continue
}
found := false
for _, oldA := range ips {
if ip.Equal(oldA) {
found = true
break
}
}
if !found {
ips = append(ips, ip)
}
}
}
for _, ip := range ips {
addresses = append(addresses, &net.UDPAddr{IP: ip, Port: port})
}
return
}
func getHostOnlyNetwork(nets map[string]*hostOnlyNetwork, hostIP net.IP, netmask net.IPMask) *hostOnlyNetwork {
for _, n := range nets {
// Second part of this conditional handles a race where
// VirtualBox returns us the incorrect netmask value for the
// newly created interface.
if hostIP.Equal(n.IPv4.IP) &&
(netmask.String() == n.IPv4.Mask.String() || n.IPv4.Mask.String() == buggyNetmask) {
return n
}
}
return nil
}
func TestUnmarshalInetCopyBytes(t *testing.T) {
data := []byte{127, 0, 0, 1}
var ip net.IP
if err := unmarshalInet(NativeType{proto: 2, typ: TypeInet}, data, &ip); err != nil {
t.Fatal(err)
}
copy(data, []byte{0xFF, 0xFF, 0xFF, 0xFF})
ip2 := net.IP(data)
if !ip.Equal(net.IPv4(127, 0, 0, 1)) {
t.Fatalf("IP memory shared with data: ip=%v ip2=%v", ip, ip2)
}
}
func (icmp *Icmp) isLocalIp(ip net.IP) bool {
if ip.IsLoopback() {
return true
}
for _, localIp := range icmp.localIps {
if ip.Equal(localIp) {
return true
}
}
return false
}
// Build a slice of iptables args for a from-container public-port rule.
// See iptablesContainerPortalArgs
// TODO: Should we just reuse iptablesContainerPortalArgs?
func (proxier *Proxier) iptablesContainerNodePortArgs(nodePort int, protocol api.Protocol, proxyIP net.IP, proxyPort int, service proxy.ServicePortName) []string {
args := iptablesCommonPortalArgs(nil, false, false, nodePort, protocol, service)
if proxyIP.Equal(zeroIPv4) || proxyIP.Equal(zeroIPv6) {
// TODO: Can we REDIRECT with IPv6?
args = append(args, "-j", "REDIRECT", "--to-ports", fmt.Sprintf("%d", proxyPort))
} else {
// TODO: Can we DNAT with IPv6?
args = append(args, "-j", "DNAT", "--to-destination", net.JoinHostPort(proxyIP.String(), strconv.Itoa(proxyPort)))
}
return args
}
func isBadIPv4(ip net.IP) bool {
if ip.To4() == nil {
panic("cannot be called for IPv6")
}
if ip.Equal(net.IPv4bcast) || !ip.IsGlobalUnicast() ||
netPrivateClassA.Contains(ip) || netPrivateClassB.Contains(ip) || netPrivateClassC.Contains(ip) ||
netTestNet.Contains(ip) || net6To4Relay.Contains(ip) {
return true
}
return false
}
func (icmp *icmpPlugin) isLocalIP(ip net.IP) bool {
if ip.IsLoopback() {
return true
}
for _, localIP := range icmp.localIps {
if ip.Equal(localIP) {
return true
}
}
return false
}
func getHostOnlyNetwork(hostIP net.IP, netmask net.IPMask) (*hostOnlyNetwork, error) {
nets, err := listHostOnlyNetworks()
if err != nil {
return nil, err
}
for _, n := range nets {
if hostIP.Equal(n.IPv4.IP) &&
netmask.String() == n.IPv4.Mask.String() {
return n, nil
}
}
return nil, nil
}
// NewProxier returns a new Proxier given a LoadBalancer and an address on
// which to listen. Because of the iptables logic, It is assumed that there
// is only a single Proxier active on a machine. An error will be returned if
// the proxier cannot be started due to an invalid ListenIP (loopback) or
// if iptables fails to update or acquire the initial lock. Once a proxier is
// created, it will keep iptables up to date in the background and will not
// terminate if a particular iptables call fails.
func NewProxier(loadBalancer LoadBalancer, listenIP net.IP, iptables iptables.Interface) (*Proxier, error) {
if listenIP.Equal(localhostIPv4) || listenIP.Equal(localhostIPv6) {
return nil, ErrProxyOnLocalhost
}
hostIP, err := util.ChooseHostInterface()
if err != nil {
return nil, fmt.Errorf("failed to select a host interface: %v", err)
}
glog.V(2).Infof("Setting proxy IP to %v and initializing iptables", hostIP)
return createProxier(loadBalancer, listenIP, iptables, hostIP)
}
func isFromMe(ip net.IP) bool {
addrs, e := net.InterfaceAddrs()
if e != nil {
log.Error(e)
}
for _, a := range addrs {
if ipnet, ok := a.(*net.IPNet); ok {
if ip.Equal(ipnet.IP) {
return true
}
}
}
return false
}
