func interfaceAddressToNetworkConfig(interfaceName, configType string, address net.Addr) (params.NetworkConfig, error) {
config := params.NetworkConfig{
ConfigType: configType,
}
cidrAddress := address.String()
if cidrAddress == "" {
return config, nil
}
ip, ipNet, err := net.ParseCIDR(cidrAddress)
if err != nil {
logger.Infof("cannot parse %q on interface %q as CIDR, trying as IP address: %v", cidrAddress, interfaceName, err)
if ip = net.ParseIP(cidrAddress); ip == nil {
return config, errors.Errorf("cannot parse IP address %q on interface %q", cidrAddress, interfaceName)
} else {
ipNet = &net.IPNet{IP: ip}
}
}
if ip.To4() == nil {
logger.Debugf("skipping observed IPv6 address %q on %q: not fully supported yet", ip, interfaceName)
// TODO(dimitern): Treat IPv6 addresses as empty until we can handle
// them reliably.
return config, nil
}
if ipNet.Mask != nil {
config.CIDR = ipNet.String()
}
config.Address = ip.String()
if configType != string(network.ConfigLoopback) {
config.ConfigType = string(network.ConfigStatic)
}
// TODO(dimitern): Add DNS servers, search domains, and gateway
// later.
return config, nil
}
// MergeProviderAndObservedNetworkConfigs returns the effective, sorted, network
// configs after merging providerConfig with observedConfig.
func MergeProviderAndObservedNetworkConfigs(providerConfigs, observedConfigs []params.NetworkConfig) []params.NetworkConfig {
providerConfigsByName := make(map[string][]params.NetworkConfig)
sortedProviderConfigs := SortNetworkConfigsByParents(providerConfigs)
for _, config := range sortedProviderConfigs {
name := config.InterfaceName
providerConfigsByName[name] = append(providerConfigsByName[name], config)
}
jsonProviderConfig, err := NetworkConfigsToIndentedJSON(sortedProviderConfigs)
if err != nil {
logger.Warningf("cannot serialize provider config %#v as JSON: %v", sortedProviderConfigs, err)
} else {
logger.Debugf("provider network config of machine:\n%s", jsonProviderConfig)
}
sortedObservedConfigs := SortNetworkConfigsByParents(observedConfigs)
jsonObservedConfig, err := NetworkConfigsToIndentedJSON(sortedObservedConfigs)
if err != nil {
logger.Warningf("cannot serialize observed config %#v as JSON: %v", sortedObservedConfigs, err)
} else {
logger.Debugf("observed network config of machine:\n%s", jsonObservedConfig)
}
var mergedConfigs []params.NetworkConfig
for _, config := range sortedObservedConfigs {
name := config.InterfaceName
logger.Tracef("merging observed config for device %q: %+v", name, config)
if strings.HasPrefix(name, instancecfg.DefaultBridgePrefix) {
logger.Tracef("found potential juju bridge %q in observed config", name)
unprefixedName := strings.TrimPrefix(name, instancecfg.DefaultBridgePrefix)
underlyingConfigs, underlyingKnownByProvider := providerConfigsByName[unprefixedName]
logger.Tracef("device %q underlying %q has provider config: %+v", name, unprefixedName, underlyingConfigs)
if underlyingKnownByProvider {
// This config is for a bridge created by Juju and not known by
// the provider. The bridge is configured to adopt the address
// allocated to the underlying interface, which is known by the
// provider. However, since the same underlying interface can
// have multiple addresses, we need to match the adopted
// bridgeConfig to the correct address.
var underlyingConfig params.NetworkConfig
for i, underlying := range underlyingConfigs {
if underlying.Address == config.Address {
logger.Tracef("replacing undelying config %+v", underlying)
// Remove what we found before changing it below.
underlyingConfig = underlying
underlyingConfigs = append(underlyingConfigs[:i], underlyingConfigs[i+1:]...)
break
}
}
logger.Tracef("underlying provider config after update: %+v", underlyingConfigs)
bridgeConfig := config
bridgeConfig.InterfaceType = string(network.BridgeInterface)
bridgeConfig.ConfigType = underlyingConfig.ConfigType
bridgeConfig.VLANTag = underlyingConfig.VLANTag
bridgeConfig.ProviderId = "" // Juju-created bridges never have a ProviderID
bridgeConfig.ProviderSpaceId = underlyingConfig.ProviderSpaceId
bridgeConfig.ProviderVLANId = underlyingConfig.ProviderVLANId
bridgeConfig.ProviderSubnetId = underlyingConfig.ProviderSubnetId
bridgeConfig.ProviderAddressId = underlyingConfig.ProviderAddressId
if underlyingParent := underlyingConfig.ParentInterfaceName; underlyingParent != "" {
bridgeConfig.ParentInterfaceName = instancecfg.DefaultBridgePrefix + underlyingParent
}
underlyingConfig.ConfigType = string(network.ConfigManual)
underlyingConfig.ParentInterfaceName = name
underlyingConfig.ProviderAddressId = ""
underlyingConfig.CIDR = ""
underlyingConfig.Address = ""
underlyingConfigs = append(underlyingConfigs, underlyingConfig)
providerConfigsByName[unprefixedName] = underlyingConfigs
logger.Tracef("updated provider network config by name: %+v", providerConfigsByName)
mergedConfigs = append(mergedConfigs, bridgeConfig)
continue
}
}
knownProviderConfigs, knownByProvider := providerConfigsByName[name]
if !knownByProvider {
// Not known by the provider and not a Juju-created bridge, so just
// use the observed config for it.
logger.Tracef("device %q not known to provider - adding only observed config: %+v", name, config)
mergedConfigs = append(mergedConfigs, config)
continue
}
logger.Tracef("device %q has known provider network config: %+v", name, knownProviderConfigs)
for _, providerConfig := range knownProviderConfigs {
if providerConfig.Address == config.Address {
logger.Tracef(
"device %q has observed address %q, index %d, and MTU %q; overriding index %d and MTU %d from provider config",
name, config.Address, config.DeviceIndex, config.MTU, providerConfig.DeviceIndex, providerConfig.MTU,
)
// Prefer observed device indices and MTU values as more up-to-date.
providerConfig.DeviceIndex = config.DeviceIndex
providerConfig.MTU = config.MTU
mergedConfigs = append(mergedConfigs, providerConfig)
break
}
}
}
sortedMergedConfigs := SortNetworkConfigsByParents(mergedConfigs)
jsonMergedConfig, err := NetworkConfigsToIndentedJSON(sortedMergedConfigs)
if err != nil {
logger.Warningf("cannot serialize merged config %#v as JSON: %v", sortedMergedConfigs, err)
} else {
logger.Debugf("combined machine network config:\n%s", jsonMergedConfig)
}
return mergedConfigs
}