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9fdcde7618
It can only be set on a "--internal" network, and the only difference is that no address is assigned to the bridge. So, there's no route to a host address. Signed-off-by: Rob Murray <rob.murray@docker.com>
54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
package bridge
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/docker/docker/libnetwork/ns"
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"github.com/vishvananda/netlink"
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)
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// setupVerifyAndReconcileIPv4 checks what IPv4 addresses the given i interface has
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// and ensures that they match the passed network config.
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func setupVerifyAndReconcileIPv4(config *networkConfiguration, i *bridgeInterface) error {
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if config.GwModeIPv4.isolated() {
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return nil
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}
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// Fetch a slice of IPv4 addresses from the bridge.
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addrsv4, err := i.addresses(netlink.FAMILY_V4)
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if err != nil {
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return fmt.Errorf("Failed to verify ip addresses: %v", err)
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}
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addrv4, _ := selectIPv4Address(addrsv4, config.AddressIPv4)
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// Verify that the bridge has an IPv4 address.
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if addrv4.IPNet == nil {
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return errors.New("bridge has no IPv4 address configured")
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}
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// Verify that the bridge IPv4 address matches the requested configuration.
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if config.AddressIPv4 != nil && !addrv4.IP.Equal(config.AddressIPv4.IP) {
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return fmt.Errorf("bridge IPv4 (%s) does not match requested configuration %s", addrv4.IP, config.AddressIPv4.IP)
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}
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return nil
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}
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func bridgeInterfaceExists(name string) (bool, error) {
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nlh := ns.NlHandle()
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link, err := nlh.LinkByName(name)
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if err != nil {
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if strings.Contains(err.Error(), "Link not found") {
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return false, nil
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}
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return false, fmt.Errorf("failed to check bridge interface existence: %v", err)
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}
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if link.Type() == "bridge" {
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return true, nil
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}
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return false, fmt.Errorf("existing interface %s is not a bridge", name)
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}
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