51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
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// +build linux
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// Network utility functions.
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package netutils
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import (
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"net"
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"strings"
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"github.com/docker/libnetwork/types"
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"github.com/vishvananda/netlink"
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)
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var (
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networkGetRoutesFct = netlink.RouteList
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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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// GenerateIfaceName returns an interface name using the passed in
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// prefix and the length of random bytes. The api ensures that the
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// there are is no interface which exists with that name.
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func GenerateIfaceName(prefix string, len int) (string, error) {
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for i := 0; i < 3; i++ {
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name, err := GenerateRandomName(prefix, len)
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if err != nil {
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continue
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}
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if _, err := netlink.LinkByName(name); err != nil {
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if strings.Contains(err.Error(), "not found") {
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return name, nil
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}
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return "", err
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}
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}
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return "", types.InternalErrorf("could not generate interface name")
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}
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