5cecd548 |
package docker
import ( |
e0e49b9a |
"encoding/binary" |
797bb6e7 |
"errors" |
5039d4a2 |
"fmt" |
2e69e172 |
"github.com/dotcloud/docker/utils" |
799ffa17 |
"log" |
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"net" |
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"os/exec"
"strconv"
"strings" |
a5fb1d6c |
"sync" |
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)
|
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var NetworkBridgeIface string
|
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const ( |
8cf30395 |
DefaultNetworkBridge = "docker0" |
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DisableNetworkBridge = "none" |
1b370f9d |
portRangeStart = 49153
portRangeEnd = 65535 |
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)
|
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// Calculates the first and last IP addresses in an IPNet |
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func networkRange(network *net.IPNet) (net.IP, net.IP) {
netIP := network.IP.To4()
firstIP := netIP.Mask(network.Mask)
lastIP := net.IPv4(0, 0, 0, 0).To4()
for i := 0; i < len(lastIP); i++ {
lastIP[i] = netIP[i] | ^network.Mask[i]
}
return firstIP, lastIP
}
|
90a6e310 |
// Detects overlap between one IPNet and another
func networkOverlaps(netX *net.IPNet, netY *net.IPNet) bool {
firstIP, _ := networkRange(netX)
if netY.Contains(firstIP) {
return true
}
firstIP, _ = networkRange(netY)
if netX.Contains(firstIP) {
return true
}
return false
}
|
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// Converts a 4 bytes IP into a 32 bit integer |
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func ipToInt(ip net.IP) int32 {
return int32(binary.BigEndian.Uint32(ip.To4())) |
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}
|
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// Converts 32 bit integer into a 4 bytes IP address |
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func intToIP(n int32) net.IP { |
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b := make([]byte, 4)
binary.BigEndian.PutUint32(b, uint32(n))
return net.IP(b) |
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}
|
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// Given a netmask, calculates the number of available hosts |
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func networkSize(mask net.IPMask) int32 { |
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m := net.IPv4Mask(0, 0, 0, 0) |
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for i := 0; i < net.IPv4len; i++ { |
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m[i] = ^mask[i] |
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} |
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return int32(binary.BigEndian.Uint32(m)) + 1 |
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}
|
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//Wrapper around the ip command
func ip(args ...string) (string, error) {
path, err := exec.LookPath("ip")
if err != nil {
return "", fmt.Errorf("command not found: ip")
}
output, err := exec.Command(path, args...).CombinedOutput()
if err != nil {
return "", fmt.Errorf("ip failed: ip %v", strings.Join(args, " "))
}
return string(output), nil
}
|
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// Wrapper around the iptables command
func iptables(args ...string) error { |
dfc3904f |
path, err := exec.LookPath("iptables")
if err != nil { |
c66d2b6a |
return fmt.Errorf("command not found: iptables") |
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}
if err := exec.Command(path, args...).Run(); err != nil { |
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return fmt.Errorf("iptables failed: iptables %v", strings.Join(args, " "))
}
return nil
}
|
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func checkRouteOverlaps(dockerNetwork *net.IPNet) error {
output, err := ip("route")
if err != nil {
return err
} |
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utils.Debugf("Routes:\n\n%s", output) |
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for _, line := range strings.Split(output, "\n") {
if strings.Trim(line, "\r\n\t ") == "" || strings.Contains(line, "default") {
continue
}
if _, network, err := net.ParseCIDR(strings.Split(line, " ")[0]); err != nil {
return fmt.Errorf("Unexpected ip route output: %s (%s)", err, line)
} else if networkOverlaps(dockerNetwork, network) {
return fmt.Errorf("Network %s is already routed: '%s'", dockerNetwork.String(), line)
}
}
return nil
}
|
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// 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. |
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func CreateBridgeIface(ifaceName string) error { |
4714f102 |
addrs := []string{
// Here we don't follow the convention of using the 1st IP of the range for the gateway.
// This is to use the same gateway IPs as the /24 ranges, which predate the /16 ranges.
// In theory this shouldn't matter - in practice there's bound to be a few scripts relying
// on the internal addressing or other stupid things like that.
// The shouldn't, but hey, let's not break them unless we really have to.
"172.16.42.1/16",
"10.0.42.1/16", // Don't even try using the entire /8, that's too intrusive
"10.1.42.1/16",
"10.42.42.1/16",
"172.16.42.1/24",
"172.16.43.1/24",
"172.16.44.1/24",
"10.0.42.1/24",
"10.0.43.1/24",
"192.168.42.1/24",
"192.168.43.1/24",
"192.168.44.1/24",
} |
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var ifaceAddr string
for _, addr := range addrs {
_, dockerNetwork, err := net.ParseCIDR(addr)
if err != nil {
return err
}
if err := checkRouteOverlaps(dockerNetwork); err == nil {
ifaceAddr = addr
break
} else { |
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utils.Debugf("%s: %s", addr, err) |
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}
}
if ifaceAddr == "" { |
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return fmt.Errorf("Could not find a free IP address range for interface '%s'. Please configure its address manually and run 'docker -b %s'", ifaceName, ifaceName) |
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} |
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utils.Debugf("Creating bridge %s with network %s", ifaceName, ifaceAddr) |
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if output, err := ip("link", "add", ifaceName, "type", "bridge"); err != nil {
return fmt.Errorf("Error creating bridge: %s (output: %s)", err, output)
}
if output, err := ip("addr", "add", ifaceAddr, "dev", ifaceName); err != nil {
return fmt.Errorf("Unable to add private network: %s (%s)", err, output)
}
if output, err := ip("link", "set", ifaceName, "up"); err != nil {
return fmt.Errorf("Unable to start network bridge: %s (%s)", err, output)
}
if err := iptables("-t", "nat", "-A", "POSTROUTING", "-s", ifaceAddr,
"!", "-d", ifaceAddr, "-j", "MASQUERADE"); err != nil {
return fmt.Errorf("Unable to enable network bridge NAT: %s", err)
}
return nil
}
|
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// Return the IPv4 address of a network interface |
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func getIfaceAddr(name string) (net.Addr, error) { |
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iface, err := net.InterfaceByName(name)
if err != nil {
return nil, err
}
addrs, err := iface.Addrs()
if err != nil {
return nil, err
}
var addrs4 []net.Addr
for _, addr := range addrs {
ip := (addr.(*net.IPNet)).IP
if ip4 := ip.To4(); len(ip4) == net.IPv4len {
addrs4 = append(addrs4, addr)
}
}
switch {
case len(addrs4) == 0: |
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return nil, fmt.Errorf("Interface %v has no IP addresses", name) |
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case len(addrs4) > 1: |
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fmt.Printf("Interface %v has more than 1 IPv4 address. Defaulting to using %v\n",
name, (addrs4[0].(*net.IPNet)).IP) |
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}
return addrs4[0], nil
}
|
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// Port mapper takes care of mapping external ports to containers by setting
// up iptables rules.
// It keeps track of all mappings and is able to unmap at will
type PortMapper struct { |
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tcpMapping map[int]*net.TCPAddr
tcpProxies map[int]Proxy
udpMapping map[int]*net.UDPAddr
udpProxies map[int]Proxy |
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}
func (mapper *PortMapper) cleanup() error {
// Ignore errors - This could mean the chains were never set up |
3b65be91 |
iptables("-t", "nat", "-D", "PREROUTING", "-m", "addrtype", "--dst-type", "LOCAL", "-j", "DOCKER") |
61259ab4 |
iptables("-t", "nat", "-D", "OUTPUT", "-m", "addrtype", "--dst-type", "LOCAL", "!", "--dst", "127.0.0.0/8", "-j", "DOCKER")
iptables("-t", "nat", "-D", "OUTPUT", "-m", "addrtype", "--dst-type", "LOCAL", "-j", "DOCKER") // Created in versions <= 0.1.6 |
ebc83795 |
// Also cleanup rules created by older versions, or -X might fail.
iptables("-t", "nat", "-D", "PREROUTING", "-j", "DOCKER")
iptables("-t", "nat", "-D", "OUTPUT", "-j", "DOCKER") |
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iptables("-t", "nat", "-F", "DOCKER")
iptables("-t", "nat", "-X", "DOCKER") |
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mapper.tcpMapping = make(map[int]*net.TCPAddr)
mapper.tcpProxies = make(map[int]Proxy)
mapper.udpMapping = make(map[int]*net.UDPAddr)
mapper.udpProxies = make(map[int]Proxy) |
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return nil
}
func (mapper *PortMapper) setup() error {
if err := iptables("-t", "nat", "-N", "DOCKER"); err != nil { |
523803d6 |
return fmt.Errorf("Failed to create DOCKER chain: %s", err) |
5039d4a2 |
} |
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if err := iptables("-t", "nat", "-A", "PREROUTING", "-m", "addrtype", "--dst-type", "LOCAL", "-j", "DOCKER"); err != nil { |
523803d6 |
return fmt.Errorf("Failed to inject docker in PREROUTING chain: %s", err) |
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} |
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if err := iptables("-t", "nat", "-A", "OUTPUT", "-m", "addrtype", "--dst-type", "LOCAL", "!", "--dst", "127.0.0.0/8", "-j", "DOCKER"); err != nil { |
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return fmt.Errorf("Failed to inject docker in OUTPUT chain: %s", err) |
3c6b8bb8 |
} |
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return nil
}
|
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func (mapper *PortMapper) iptablesForward(rule string, port int, proto string, dest_addr string, dest_port int) error {
return iptables("-t", "nat", rule, "DOCKER", "-p", proto, "--dport", strconv.Itoa(port),
"-j", "DNAT", "--to-destination", net.JoinHostPort(dest_addr, strconv.Itoa(dest_port))) |
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}
|
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func (mapper *PortMapper) Map(port int, backendAddr net.Addr) error {
if _, isTCP := backendAddr.(*net.TCPAddr); isTCP {
backendPort := backendAddr.(*net.TCPAddr).Port
backendIP := backendAddr.(*net.TCPAddr).IP
if err := mapper.iptablesForward("-A", port, "tcp", backendIP.String(), backendPort); err != nil {
return err
}
mapper.tcpMapping[port] = backendAddr.(*net.TCPAddr)
proxy, err := NewProxy(&net.TCPAddr{IP: net.IPv4(127, 0, 0, 1), Port: port}, backendAddr) |
930e9a7e |
if err != nil { |
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mapper.Unmap(port, "tcp") |
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return err
} |
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mapper.tcpProxies[port] = proxy
go proxy.Run()
} else {
backendPort := backendAddr.(*net.UDPAddr).Port
backendIP := backendAddr.(*net.UDPAddr).IP
if err := mapper.iptablesForward("-A", port, "udp", backendIP.String(), backendPort); err != nil {
return err
}
mapper.udpMapping[port] = backendAddr.(*net.UDPAddr)
proxy, err := NewProxy(&net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: port}, backendAddr) |
930e9a7e |
if err != nil { |
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mapper.Unmap(port, "udp")
return err |
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} |
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mapper.udpProxies[port] = proxy
go proxy.Run() |
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} |
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return nil |
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}
|
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func (mapper *PortMapper) Unmap(port int, proto string) error {
if proto == "tcp" {
backendAddr, ok := mapper.tcpMapping[port]
if !ok {
return fmt.Errorf("Port tcp/%v is not mapped", port)
}
if proxy, exists := mapper.tcpProxies[port]; exists {
proxy.Close()
delete(mapper.tcpProxies, port)
}
if err := mapper.iptablesForward("-D", port, proto, backendAddr.IP.String(), backendAddr.Port); err != nil {
return err
}
delete(mapper.tcpMapping, port)
} else {
backendAddr, ok := mapper.udpMapping[port]
if !ok {
return fmt.Errorf("Port udp/%v is not mapped", port)
}
if proxy, exists := mapper.udpProxies[port]; exists {
proxy.Close()
delete(mapper.udpProxies, port)
}
if err := mapper.iptablesForward("-D", port, proto, backendAddr.IP.String(), backendAddr.Port); err != nil {
return err
}
delete(mapper.udpMapping, port) |
e0e49b9a |
} |
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return nil
}
func newPortMapper() (*PortMapper, error) {
mapper := &PortMapper{}
if err := mapper.cleanup(); err != nil { |
c08f5b2b |
return nil, err |
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} |
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if err := mapper.setup(); err != nil {
return nil, err
}
return mapper, nil |
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} |
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|
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// Port allocator: Atomatically allocate and release networking ports
type PortAllocator struct { |
1cf9c80e |
sync.Mutex |
2aad4a34 |
inUse map[int]struct{} |
a5fb1d6c |
fountain chan (int) |
797bb6e7 |
}
|
a5fb1d6c |
func (alloc *PortAllocator) runFountain() {
for {
for port := portRangeStart; port < portRangeEnd; port++ {
alloc.fountain <- port
} |
797bb6e7 |
}
}
|
a5fb1d6c |
// FIXME: Release can no longer fail, change its prototype to reflect that. |
799ffa17 |
func (alloc *PortAllocator) Release(port int) error { |
2e69e172 |
utils.Debugf("Releasing %d", port) |
1cf9c80e |
alloc.Lock() |
a5fb1d6c |
delete(alloc.inUse, port) |
1cf9c80e |
alloc.Unlock() |
a5fb1d6c |
return nil
}
func (alloc *PortAllocator) Acquire(port int) (int, error) { |
2e69e172 |
utils.Debugf("Acquiring %d", port) |
a5fb1d6c |
if port == 0 {
// Allocate a port from the fountain
for port := range alloc.fountain {
if _, err := alloc.Acquire(port); err == nil {
return port, nil
}
}
return -1, fmt.Errorf("Port generator ended unexpectedly") |
797bb6e7 |
} |
1cf9c80e |
alloc.Lock()
defer alloc.Unlock() |
a5fb1d6c |
if _, inUse := alloc.inUse[port]; inUse {
return -1, fmt.Errorf("Port already in use: %d", port)
}
alloc.inUse[port] = struct{}{}
return port, nil |
797bb6e7 |
}
|
a5fb1d6c |
func newPortAllocator() (*PortAllocator, error) {
allocator := &PortAllocator{ |
22893429 |
inUse: make(map[int]struct{}), |
d32f1846 |
fountain: make(chan int), |
a5fb1d6c |
}
go allocator.runFountain() |
799ffa17 |
return allocator, nil
}
// IP allocator: Atomatically allocate and release networking ports
type IPAllocator struct { |
6f9a67a7 |
network *net.IPNet
queueAlloc chan allocatedIP
queueReleased chan net.IP
inUse map[int32]struct{}
}
type allocatedIP struct {
ip net.IP
err error |
799ffa17 |
}
|
6f9a67a7 |
func (alloc *IPAllocator) run() { |
799ffa17 |
firstIP, _ := networkRange(alloc.network) |
6f9a67a7 |
ipNum := ipToInt(firstIP)
ownIP := ipToInt(alloc.network.IP)
size := networkSize(alloc.network.Mask)
pos := int32(1)
max := size - 2 // -1 for the broadcast address, -1 for the gateway address
for {
var (
newNum int32
inUse bool
)
// Find first unused IP, give up after one whole round
for attempt := int32(0); attempt < max; attempt++ {
newNum = ipNum + pos
pos = pos%max + 1
// The network's IP is never okay to use
if newNum == ownIP {
continue
}
if _, inUse = alloc.inUse[newNum]; !inUse {
// We found an unused IP
break
} |
797bb6e7 |
} |
6f9a67a7 |
|
fd224ee5 |
ip := allocatedIP{ip: intToIP(newNum)} |
6f9a67a7 |
if inUse {
ip.err = errors.New("No unallocated IP available") |
797bb6e7 |
} |
6f9a67a7 |
select {
case alloc.queueAlloc <- ip:
alloc.inUse[newNum] = struct{}{}
case released := <-alloc.queueReleased:
r := ipToInt(released)
delete(alloc.inUse, r)
if inUse {
// If we couldn't allocate a new IP, the released one
// will be the only free one now, so instantly use it
// next time
pos = r - ipNum
} else {
// Use same IP as last time
if pos == 1 {
pos = max
} else {
pos--
}
} |
797bb6e7 |
} |
799ffa17 |
}
}
func (alloc *IPAllocator) Acquire() (net.IP, error) { |
6f9a67a7 |
ip := <-alloc.queueAlloc
return ip.ip, ip.err |
799ffa17 |
}
|
6f9a67a7 |
func (alloc *IPAllocator) Release(ip net.IP) {
alloc.queueReleased <- ip |
797bb6e7 |
}
|
6f9a67a7 |
func newIPAllocator(network *net.IPNet) *IPAllocator { |
799ffa17 |
alloc := &IPAllocator{ |
6f9a67a7 |
network: network,
queueAlloc: make(chan allocatedIP),
queueReleased: make(chan net.IP),
inUse: make(map[int32]struct{}), |
799ffa17 |
} |
6f9a67a7 |
go alloc.run()
return alloc |
799ffa17 |
}
// Network interface represents the networking stack of a container
type NetworkInterface struct {
IPNet net.IPNet
Gateway net.IP
manager *NetworkManager |
fac0d87d |
extPorts []*Nat |
49673fc4 |
disabled bool |
799ffa17 |
}
// Allocate an external TCP port and map it to the interface |
2aad4a34 |
func (iface *NetworkInterface) AllocatePort(spec string) (*Nat, error) { |
49673fc4 |
if iface.disabled {
return nil, fmt.Errorf("Trying to allocate port for interface %v, which is disabled", iface) // FIXME
}
|
2aad4a34 |
nat, err := parseNat(spec) |
799ffa17 |
if err != nil { |
2aad4a34 |
return nil, err
} |
fac0d87d |
if nat.Proto == "tcp" {
extPort, err := iface.manager.tcpPortAllocator.Acquire(nat.Frontend)
if err != nil {
return nil, err
}
backend := &net.TCPAddr{IP: iface.IPNet.IP, Port: nat.Backend}
if err := iface.manager.portMapper.Map(extPort, backend); err != nil {
iface.manager.tcpPortAllocator.Release(extPort)
return nil, err
}
nat.Frontend = extPort
} else {
extPort, err := iface.manager.udpPortAllocator.Acquire(nat.Frontend)
if err != nil {
return nil, err
}
backend := &net.UDPAddr{IP: iface.IPNet.IP, Port: nat.Backend}
if err := iface.manager.portMapper.Map(extPort, backend); err != nil {
iface.manager.udpPortAllocator.Release(extPort)
return nil, err
}
nat.Frontend = extPort |
2aad4a34 |
} |
fac0d87d |
iface.extPorts = append(iface.extPorts, nat)
|
2aad4a34 |
return nat, nil
}
type Nat struct {
Proto string
Frontend int
Backend int
}
func parseNat(spec string) (*Nat, error) {
var nat Nat |
95d66ebc |
|
fac0d87d |
if strings.Contains(spec, "/") {
specParts := strings.Split(spec, "/")
if len(specParts) != 2 {
return nil, fmt.Errorf("Invalid port format.")
}
proto := specParts[1]
spec = specParts[0]
if proto != "tcp" && proto != "udp" {
return nil, fmt.Errorf("Invalid port format: unknown protocol %v.", proto)
}
nat.Proto = proto
} else {
nat.Proto = "tcp"
}
|
95d66ebc |
if strings.Contains(spec, ":") {
specParts := strings.Split(spec, ":")
if len(specParts) != 2 {
return nil, fmt.Errorf("Invalid port format.")
}
// If spec starts with ':', external and internal ports must be the same.
// This might fail if the requested external port is not available.
var sameFrontend bool
if len(specParts[0]) == 0 {
sameFrontend = true
} else {
front, err := strconv.ParseUint(specParts[0], 10, 16)
if err != nil {
return nil, err
}
nat.Frontend = int(front)
}
back, err := strconv.ParseUint(specParts[1], 10, 16)
if err != nil {
return nil, err
}
nat.Backend = int(back)
if sameFrontend {
nat.Frontend = nat.Backend
}
} else {
port, err := strconv.ParseUint(spec, 10, 16)
if err != nil {
return nil, err
}
nat.Backend = int(port) |
799ffa17 |
} |
fac0d87d |
|
2aad4a34 |
return &nat, nil |
799ffa17 |
}
// Release: Network cleanup - release all resources |
6f9a67a7 |
func (iface *NetworkInterface) Release() { |
49673fc4 |
if iface.disabled {
return
}
|
fac0d87d |
for _, nat := range iface.extPorts {
utils.Debugf("Unmaping %v/%v", nat.Proto, nat.Frontend)
if err := iface.manager.portMapper.Unmap(nat.Frontend, nat.Proto); err != nil {
log.Printf("Unable to unmap port %v/%v: %v", nat.Proto, nat.Frontend, err) |
799ffa17 |
} |
fac0d87d |
if nat.Proto == "tcp" {
if err := iface.manager.tcpPortAllocator.Release(nat.Frontend); err != nil {
log.Printf("Unable to release port tcp/%v: %v", nat.Frontend, err)
}
} else if err := iface.manager.udpPortAllocator.Release(nat.Frontend); err != nil {
log.Printf("Unable to release port udp/%v: %v", nat.Frontend, err) |
799ffa17 |
}
} |
6f9a67a7 |
iface.manager.ipAllocator.Release(iface.IPNet.IP) |
799ffa17 |
}
// Network Manager manages a set of network interfaces
// Only *one* manager per host machine should be used
type NetworkManager struct {
bridgeIface string
bridgeNetwork *net.IPNet
|
fac0d87d |
ipAllocator *IPAllocator
tcpPortAllocator *PortAllocator
udpPortAllocator *PortAllocator
portMapper *PortMapper |
49673fc4 |
disabled bool |
799ffa17 |
}
// Allocate a network interface
func (manager *NetworkManager) Allocate() (*NetworkInterface, error) { |
49673fc4 |
if manager.disabled {
return &NetworkInterface{disabled: true}, nil
}
|
799ffa17 |
ip, err := manager.ipAllocator.Acquire() |
797bb6e7 |
if err != nil { |
c08f5b2b |
return nil, err |
797bb6e7 |
} |
c08f5b2b |
iface := &NetworkInterface{ |
ab99e925 |
IPNet: net.IPNet{IP: ip, Mask: manager.bridgeNetwork.Mask}, |
799ffa17 |
Gateway: manager.bridgeNetwork.IP,
manager: manager, |
c08f5b2b |
}
return iface, nil
}
|
799ffa17 |
func newNetworkManager(bridgeIface string) (*NetworkManager, error) { |
49673fc4 |
if bridgeIface == DisableNetworkBridge {
manager := &NetworkManager{
disabled: true,
}
return manager, nil
}
|
799ffa17 |
addr, err := getIfaceAddr(bridgeIface)
if err != nil { |
aa4bf428 |
// If the iface is not found, try to create it
if err := CreateBridgeIface(bridgeIface); err != nil {
return nil, err
}
addr, err = getIfaceAddr(bridgeIface)
if err != nil {
return nil, err
} |
799ffa17 |
}
network := addr.(*net.IPNet)
|
6f9a67a7 |
ipAllocator := newIPAllocator(network) |
799ffa17 |
|
fac0d87d |
tcpPortAllocator, err := newPortAllocator()
if err != nil {
return nil, err
}
udpPortAllocator, err := newPortAllocator() |
799ffa17 |
if err != nil {
return nil, err
}
portMapper, err := newPortMapper() |
37122552 |
if err != nil {
return nil, err
} |
799ffa17 |
manager := &NetworkManager{ |
fac0d87d |
bridgeIface: bridgeIface,
bridgeNetwork: network,
ipAllocator: ipAllocator,
tcpPortAllocator: tcpPortAllocator,
udpPortAllocator: udpPortAllocator,
portMapper: portMapper, |
799ffa17 |
}
return manager, nil |
797bb6e7 |
} |