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https://github.com/moby/moby.git
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68d223a0e0
- Move ipallocator package into libnetwork - Also ported network utility functions and their tests in libnetwork: docker/daemon/networkdriver/utilg.go => libnetwork/utils.go docker/daemon/networkdriver/network_test.go => libnetwork/utils_test.go - Changed drivers/setup_device.go and setup_ipv4.go to reuse functions in utils.go, instead of redefining internally. - Modified utils to use vishvananda/netlink instead of libcontainer/netlink Signed-off-by: Alessandro Boch <aboch@socketplane.io>
127 lines
3.3 KiB
Go
127 lines
3.3 KiB
Go
// Network utility functions.
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// Imported unchanged from Docker
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package libnetwork
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import (
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"errors"
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"fmt"
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"math/rand"
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"net"
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"github.com/vishvananda/netlink"
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)
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var (
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// ErrNetworkOverlapsWithNameservers preformatted error
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ErrNetworkOverlapsWithNameservers = errors.New("requested network overlaps with nameserver")
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// ErrNetworkOverlaps preformatted error
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ErrNetworkOverlaps = errors.New("requested network overlaps with existing network")
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// ErrNoDefaultRoute preformatted error
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ErrNoDefaultRoute = errors.New("no default route")
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networkGetRoutesFct = netlink.RouteList
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)
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// CheckNameserverOverlaps checks whether the passed network overlaps with any of the nameservers
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func CheckNameserverOverlaps(nameservers []string, toCheck *net.IPNet) error {
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if len(nameservers) > 0 {
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for _, ns := range nameservers {
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_, nsNetwork, err := net.ParseCIDR(ns)
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if err != nil {
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return err
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}
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if NetworkOverlaps(toCheck, nsNetwork) {
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return ErrNetworkOverlapsWithNameservers
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}
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}
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}
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return nil
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}
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// CheckRouteOverlaps checks whether the passed network overlaps with any existing routes
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func CheckRouteOverlaps(toCheck *net.IPNet) error {
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networks, err := networkGetRoutesFct(nil, netlink.FAMILY_V4)
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if err != nil {
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return err
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}
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for _, network := range networks {
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if network.Dst != nil && NetworkOverlaps(toCheck, network.Dst) {
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return ErrNetworkOverlaps
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}
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}
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return nil
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}
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// NetworkOverlaps detects overlap between one IPNet and another
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func NetworkOverlaps(netX *net.IPNet, netY *net.IPNet) bool {
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if len(netX.IP) == len(netY.IP) {
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if firstIP, _ := NetworkRange(netX); netY.Contains(firstIP) {
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return true
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}
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if firstIP, _ := NetworkRange(netY); netX.Contains(firstIP) {
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return true
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}
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}
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return false
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}
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// NetworkRange calculates the first and last IP addresses in an IPNet
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func NetworkRange(network *net.IPNet) (net.IP, net.IP) {
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var netIP net.IP
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if network.IP.To4() != nil {
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netIP = network.IP.To4()
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} else if network.IP.To16() != nil {
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netIP = network.IP.To16()
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} else {
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return nil, nil
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}
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lastIP := make([]byte, len(netIP), len(netIP))
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for i := 0; i < len(netIP); i++ {
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lastIP[i] = netIP[i] | ^network.Mask[i]
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}
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return netIP.Mask(network.Mask), net.IP(lastIP)
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}
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// GetIfaceAddr returns the first IPv4 address and slice of IPv6 addresses for the specified network interface
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func GetIfaceAddr(name string) (net.Addr, []net.Addr, error) {
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iface, err := net.InterfaceByName(name)
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if err != nil {
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return nil, nil, err
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}
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addrs, err := iface.Addrs()
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if err != nil {
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return nil, nil, err
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}
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var addrs4 []net.Addr
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var addrs6 []net.Addr
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for _, addr := range addrs {
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ip := (addr.(*net.IPNet)).IP
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if ip4 := ip.To4(); ip4 != nil {
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addrs4 = append(addrs4, addr)
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} else if ip6 := ip.To16(); len(ip6) == net.IPv6len {
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addrs6 = append(addrs6, addr)
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}
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}
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switch {
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case len(addrs4) == 0:
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return nil, nil, fmt.Errorf("Interface %v has no IPv4 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",
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name, (addrs4[0].(*net.IPNet)).IP)
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}
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return addrs4[0], addrs6, nil
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}
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// GenerateRandomMAC returns a random MAC address
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func GenerateRandomMAC() net.HardwareAddr {
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hw := make(net.HardwareAddr, 6)
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for i := 0; i < 6; i++ {
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hw[i] = byte(rand.Intn(255))
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}
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hw[0] &^= 0x1 // clear multicast bit
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hw[0] |= 0x2 // set local assignment bit (IEEE802)
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return hw
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}
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