Allow user to control the default address pools

- Via daemon flag --default-address-pools base=<CIDR>,size=<int>

Signed-off-by: Elango Siva  <elango@docker.com>
Upstream-commit: 173b3c364ebedd56bd5b6c190a9b41f592ba57d6
Component: engine

components/engine/daemon/config/config.go

@@ -71,6 +71,12 @@ type commonBridgeConfig struct {
 	FixedCIDR string `json:"fixed-cidr,omitempty"`
 }
 
+// NetworkConfig stores the daemon-wide networking configurations
+type NetworkConfig struct {
+	// Default address pools for docker networks
+	DefaultAddressPools opts.PoolsOpt `json:"default-address-pools,omitempty"`
+}
+
 // CommonTLSOptions defines TLS configuration for the daemon server.
 // It includes json tags to deserialize configuration from a file
 // using the same names that the flags in the command line use.
@@ -173,6 +179,7 @@ type CommonConfig struct {
 
 	LogConfig
 	BridgeConfig // bridgeConfig holds bridge network specific configuration.
+	NetworkConfig
 	registry.ServiceOptions
 
 	sync.Mutex

components/engine/daemon/config/config_unix.go

@@ -23,7 +23,6 @@ type Config struct {
 
 	// These fields are common to all unix platforms.
 	CommonUnixConfig
-
 	// Fields below here are platform specific.
 	CgroupParent         string                   `json:"cgroup-parent,omitempty"`
 	EnableSelinuxSupport bool                     `json:"selinux-enabled,omitempty"`

components/engine/daemon/daemon.go

@@ -1223,6 +1223,10 @@ func (daemon *Daemon) networkOptions(dconfig *config.Config, pg plugingetter.Plu
 	options = append(options, nwconfig.OptionLabels(dconfig.Labels))
 	options = append(options, driverOptions(dconfig)...)
 
+	if len(dconfig.NetworkConfig.DefaultAddressPools.Value()) > 0 {
+		options = append(options, nwconfig.OptionDefaultAddressPoolConfig(dconfig.NetworkConfig.DefaultAddressPools.Value()))
+	}
+
 	if daemon.configStore != nil && daemon.configStore.LiveRestoreEnabled && len(activeSandboxes) != 0 {
 		options = append(options, nwconfig.OptionActiveSandboxes(activeSandboxes))
 	}

components/engine/daemon/daemon_unix.go

@@ -833,6 +833,9 @@ func (daemon *Daemon) initNetworkController(config *config.Config, activeSandbox
 		if err = n.Delete(); err != nil {
 			return nil, fmt.Errorf("could not delete the default bridge network: %v", err)
 		}
+		if len(config.NetworkConfig.DefaultAddressPools.Value()) > 0 && !daemon.configStore.LiveRestoreEnabled {
+			removeDefaultBridgeInterface()
+		}
 	}
 
 	if !config.DisableBridge {