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package bridge
import (
"errors"
"fmt"
"strings"
"github.com/docker/docker/libnetwork/ns"
"github.com/vishvananda/netlink"
)
// setupVerifyAndReconcileIPv4 checks what IPv4 addresses the given i interface has
// and ensures that they match the passed network config.
func setupVerifyAndReconcileIPv4(config *networkConfiguration, i *bridgeInterface) error {
if config.GwModeIPv4.isolated() {
return nil
}
// Fetch a slice of IPv4 addresses from the bridge.
addrsv4, err := i.addresses(netlink.FAMILY_V4)
if err != nil {
return fmt.Errorf("Failed to verify ip addresses: %v", err)
}
addrv4, _ := selectIPv4Address(addrsv4, config.AddressIPv4)
// Verify that the bridge has an IPv4 address.
if addrv4.IPNet == nil {
return errors.New("bridge has no IPv4 address configured")
}
// Verify that the bridge IPv4 address matches the requested configuration.
if config.AddressIPv4 != nil && !addrv4.IP.Equal(config.AddressIPv4.IP) {
return fmt.Errorf("bridge IPv4 (%s) does not match requested configuration %s", addrv4.IP, config.AddressIPv4.IP)
}
return nil
}
func bridgeInterfaceExists(name string) (bool, error) {
nlh := ns.NlHandle()
link, err := nlh.LinkByName(name)
if err != nil {
if strings.Contains(err.Error(), "Link not found") {
return false, nil
}
return false, fmt.Errorf("failed to check bridge interface existence: %v", err)
}
if link.Type() == "bridge" {
return true, nil
}
return false, fmt.Errorf("existing interface %s is not a bridge", name)
}
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