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macvlan_network.go
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macvlan_network.go
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//go:build linux
package macvlan
import (
"context"
"fmt"
"github.com/containerd/log"
"github.com/docker/docker/libnetwork/driverapi"
"github.com/docker/docker/libnetwork/netlabel"
"github.com/docker/docker/libnetwork/ns"
"github.com/docker/docker/libnetwork/options"
"github.com/docker/docker/libnetwork/types"
"github.com/docker/docker/pkg/stringid"
)
// CreateNetwork the network for the specified driver type
func (d *driver) CreateNetwork(nid string, option map[string]interface{}, nInfo driverapi.NetworkInfo, ipV4Data, ipV6Data []driverapi.IPAMData) error {
// reject a null v4 network
if len(ipV4Data) == 0 || ipV4Data[0].Pool.String() == "0.0.0.0/0" {
return fmt.Errorf("ipv4 pool is empty")
}
// parse and validate the config and bind to networkConfiguration
config, err := parseNetworkOptions(nid, option)
if err != nil {
return err
}
config.processIPAM(ipV4Data, ipV6Data)
// if parent interface not specified, create a dummy type link to use named dummy+net_id
if config.Parent == "" {
config.Parent = getDummyName(stringid.TruncateID(config.ID))
}
foundExisting, err := d.createNetwork(config)
if err != nil {
return err
}
if foundExisting {
return types.InternalMaskableErrorf("restoring existing network %s", config.ID)
}
// update persistent db, rollback on fail
err = d.storeUpdate(config)
if err != nil {
d.deleteNetwork(config.ID)
log.G(context.TODO()).Debugf("encountered an error rolling back a network create for %s : %v", config.ID, err)
return err
}
return nil
}
// createNetwork is used by new network callbacks and persistent network cache
func (d *driver) createNetwork(config *configuration) (bool, error) {
foundExisting := false
networkList := d.getNetworks()
for _, nw := range networkList {
if config.Parent == nw.config.Parent {
if config.ID != nw.config.ID {
return false, fmt.Errorf("network %s is already using parent interface %s",
getDummyName(stringid.TruncateID(nw.config.ID)), config.Parent)
}
log.G(context.TODO()).Debugf("Create Network for the same ID %s\n", config.ID)
foundExisting = true
break
}
}
if !parentExists(config.Parent) {
// Create a dummy link if a dummy name is set for parent
if dummyName := getDummyName(stringid.TruncateID(config.ID)); dummyName == config.Parent {
err := createDummyLink(config.Parent, dummyName)
if err != nil {
return false, err
}
config.CreatedSlaveLink = true
// notify the user in logs that they have limited communications
log.G(context.TODO()).Debugf("Empty -o parent= flags limit communications to other containers inside of network: %s",
config.Parent)
} else {
// if the subinterface parent_iface.vlan_id checks do not pass, return err.
// a valid example is 'eth0.10' for a parent iface 'eth0' with a vlan id '10'
err := createVlanLink(config.Parent)
if err != nil {
return false, err
}
// if driver created the networks slave link, record it for future deletion
config.CreatedSlaveLink = true
}
}
if !foundExisting {
n := &network{
id: config.ID,
driver: d,
endpoints: endpointTable{},
config: config,
}
// add the network
d.addNetwork(n)
}
return foundExisting, nil
}
// DeleteNetwork deletes the network for the specified driver type
func (d *driver) DeleteNetwork(nid string) error {
n := d.network(nid)
if n == nil {
return fmt.Errorf("network id %s not found", nid)
}
// if the driver created the slave interface, delete it, otherwise leave it
if ok := n.config.CreatedSlaveLink; ok {
// if the interface exists, only delete if it matches iface.vlan or dummy.net_id naming
if ok := parentExists(n.config.Parent); ok {
// only delete the link if it is named the net_id
if n.config.Parent == getDummyName(stringid.TruncateID(nid)) {
err := delDummyLink(n.config.Parent)
if err != nil {
log.G(context.TODO()).Debugf("link %s was not deleted, continuing the delete network operation: %v",
n.config.Parent, err)
}
} else {
// only delete the link if it matches iface.vlan naming
err := delVlanLink(n.config.Parent)
if err != nil {
log.G(context.TODO()).Debugf("link %s was not deleted, continuing the delete network operation: %v",
n.config.Parent, err)
}
}
}
}
for _, ep := range n.endpoints {
if link, err := ns.NlHandle().LinkByName(ep.srcName); err == nil {
if err := ns.NlHandle().LinkDel(link); err != nil {
log.G(context.TODO()).WithError(err).Warnf("Failed to delete interface (%s)'s link on endpoint (%s) delete", ep.srcName, ep.id)
}
}
if err := d.storeDelete(ep); err != nil {
log.G(context.TODO()).Warnf("Failed to remove macvlan endpoint %.7s from store: %v", ep.id, err)
}
}
// delete the *network
d.deleteNetwork(nid)
// delete the network record from persistent cache
err := d.storeDelete(n.config)
if err != nil {
return fmt.Errorf("error deleting id %s from datastore: %v", nid, err)
}
return nil
}
// parseNetworkOptions parses docker network options
func parseNetworkOptions(id string, option options.Generic) (*configuration, error) {
var (
err error
config = &configuration{}
)
// parse generic labels first
if genData, ok := option[netlabel.GenericData]; ok && genData != nil {
if config, err = parseNetworkGenericOptions(genData); err != nil {
return nil, err
}
}
if val, ok := option[netlabel.Internal]; ok {
if internal, ok := val.(bool); ok && internal {
config.Internal = true
}
}
// verify the macvlan mode from -o macvlan_mode option
switch config.MacvlanMode {
case "":
// default to macvlan bridge mode if -o macvlan_mode is empty
config.MacvlanMode = modeBridge
case modeBridge, modePrivate, modePassthru, modeVepa:
// valid option
default:
return nil, fmt.Errorf("requested macvlan mode '%s' is not valid, 'bridge' mode is the macvlan driver default", config.MacvlanMode)
}
// loopback is not a valid parent link
if config.Parent == "lo" {
return nil, fmt.Errorf("loopback interface is not a valid macvlan parent link")
}
config.ID = id
return config, nil
}
// parseNetworkGenericOptions parses generic driver docker network options
func parseNetworkGenericOptions(data interface{}) (*configuration, error) {
switch opt := data.(type) {
case *configuration:
return opt, nil
case map[string]string:
return newConfigFromLabels(opt), nil
case options.Generic:
var config *configuration
opaqueConfig, err := options.GenerateFromModel(opt, config)
if err != nil {
return nil, err
}
return opaqueConfig.(*configuration), nil
default:
return nil, types.InvalidParameterErrorf("unrecognized network configuration format: %v", opt)
}
}
// newConfigFromLabels creates a new configuration from the given labels.
func newConfigFromLabels(labels map[string]string) *configuration {
config := &configuration{}
for label, value := range labels {
switch label {
case parentOpt:
// parse driver option '-o parent'
config.Parent = value
case driverModeOpt:
// parse driver option '-o macvlan_mode'
config.MacvlanMode = value
}
}
return config
}
// processIPAM parses v4 and v6 IP information and binds it to the network configuration
func (config *configuration) processIPAM(ipamV4Data, ipamV6Data []driverapi.IPAMData) {
for _, ipd := range ipamV4Data {
config.Ipv4Subnets = append(config.Ipv4Subnets, &ipSubnet{
SubnetIP: ipd.Pool.String(),
GwIP: ipd.Gateway.String(),
})
}
for _, ipd := range ipamV6Data {
config.Ipv6Subnets = append(config.Ipv6Subnets, &ipSubnet{
SubnetIP: ipd.Pool.String(),
GwIP: ipd.Gateway.String(),
})
}
}