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81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
package bridge
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import (
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"net"
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"github.com/docker/libnetwork"
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)
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const (
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NetworkType = "simplebridge"
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VethPrefix = "veth"
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)
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type Configuration struct {
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BridgeName string
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AddressIPv4 *net.IPNet
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FixedCIDR *net.IPNet
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FixedCIDRv6 *net.IPNet
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EnableIPv6 bool
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EnableIPTables bool
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EnableIPForwarding bool
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}
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func init() {
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libnetwork.RegisterNetworkType(NetworkType, Create, &Configuration{})
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}
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func Create(name string, config *Configuration) (libnetwork.Network, error) {
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bridgeIntfc := NewInterface(config)
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bridgeSetup := NewBridgeSetup(bridgeIntfc)
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// If the bridge interface doesn't exist, we need to start the setup steps
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// by creating a new device and assigning it an IPv4 address.
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bridgeAlreadyExists := bridgeIntfc.Exists()
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if !bridgeAlreadyExists {
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bridgeSetup.QueueStep(SetupDevice)
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bridgeSetup.QueueStep(SetupBridgeIPv4)
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}
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// Conditionnally queue setup steps depending on configuration values.
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for _, step := range []struct {
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Condition bool
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Fn SetupStep
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}{
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// Enable IPv6 on the bridge if required. We do this even for a
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// previously existing bridge, as it may be here from a previous
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// installation where IPv6 wasn't supported yet and needs to be
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// assigned an IPv6 link-local address.
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{config.EnableIPv6, SetupBridgeIPv6},
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// We ensure that the bridge has the expectedIPv4 and IPv6 addresses in
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// the case of a previously existing device.
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{bridgeAlreadyExists, SetupVerifyConfiguredAddresses},
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// Setup the bridge to allocate containers IPv4 addresses in the
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// specified subnet.
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{config.FixedCIDR != nil, SetupFixedCIDRv4},
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// Setup the bridge to allocate containers global IPv6 addresses in the
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// specified subnet.
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{config.FixedCIDRv6 != nil, SetupFixedCIDRv6},
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// Setup IPTables.
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{config.EnableIPTables, SetupIPTables},
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// Setup IP forwarding.
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{config.EnableIPForwarding, SetupIPForwarding},
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} {
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if step.Condition {
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bridgeSetup.QueueStep(step.Fn)
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}
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}
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// Apply the prepared list of steps, and abort at the first error.
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bridgeSetup.QueueStep(SetupDeviceUp)
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if err := bridgeSetup.Apply(); err != nil {
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return nil, err
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}
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return &bridgeNetwork{NetworkName: name, Config: *config}, nil
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}
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