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package network
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/containernetworking/cni/pkg/version"
"github.com/containers/podman/v2/libpod"
"github.com/containers/podman/v2/pkg/domain/entities"
"github.com/containers/podman/v2/pkg/util"
"github.com/pkg/errors"
)
func Create(name string, options entities.NetworkCreateOptions, r *libpod.Runtime) (*entities.NetworkCreateReport, error) {
var fileName string
if err := isSupportedDriver(options.Driver); err != nil {
return nil, err
}
config, err := r.GetConfig()
if err != nil {
return nil, err
}
// Acquire a lock for CNI
l, err := acquireCNILock(filepath.Join(config.Engine.TmpDir, LockFileName))
if err != nil {
return nil, err
}
defer l.releaseCNILock()
if len(options.MacVLAN) > 0 {
fileName, err = createMacVLAN(r, name, options)
} else {
fileName, err = createBridge(r, name, options)
}
if err != nil {
return nil, err
}
return &entities.NetworkCreateReport{Filename: fileName}, nil
}
// createBridge creates a CNI network
func createBridge(r *libpod.Runtime, name string, options entities.NetworkCreateOptions) (string, error) {
isGateway := true
ipMasq := true
subnet := &options.Subnet
ipRange := options.Range
runtimeConfig, err := r.GetConfig()
if err != nil {
return "", err
}
// if range is provided, make sure it is "in" network
if subnet.IP != nil {
// if network is provided, does it conflict with existing CNI or live networks
err = ValidateUserNetworkIsAvailable(runtimeConfig, subnet)
} else {
// if no network is provided, figure out network
subnet, err = GetFreeNetwork(runtimeConfig)
}
if err != nil {
return "", err
}
gateway := options.Gateway
if gateway == nil {
// if no gateway is provided, provide it as first ip of network
gateway = CalcGatewayIP(subnet)
}
// if network is provided and if gateway is provided, make sure it is "in" network
if options.Subnet.IP != nil && options.Gateway != nil {
if !subnet.Contains(gateway) {
return "", errors.Errorf("gateway %s is not in valid for subnet %s", gateway.String(), subnet.String())
}
}
if options.Internal {
isGateway = false
ipMasq = false
}
// if a range is given, we need to ensure it is "in" the network range.
if options.Range.IP != nil {
if options.Subnet.IP == nil {
return "", errors.New("you must define a subnet range to define an ip-range")
}
firstIP, err := FirstIPInSubnet(&options.Range)
if err != nil {
return "", err
}
lastIP, err := LastIPInSubnet(&options.Range)
if err != nil {
return "", err
}
if !subnet.Contains(firstIP) || !subnet.Contains(lastIP) {
return "", errors.Errorf("the ip range %s does not fall within the subnet range %s", options.Range.String(), subnet.String())
}
}
bridgeDeviceName, err := GetFreeDeviceName(runtimeConfig)
if err != nil {
return "", err
}
if len(name) > 0 {
netNames, err := GetNetworkNamesFromFileSystem(runtimeConfig)
if err != nil {
return "", err
}
if util.StringInSlice(name, netNames) {
return "", errors.Errorf("the network name %s is already used", name)
}
} else {
// If no name is given, we give the name of the bridge device
name = bridgeDeviceName
}
ncList := NewNcList(name, version.Current())
var plugins []CNIPlugins
var routes []IPAMRoute
defaultRoute, err := NewIPAMDefaultRoute(IsIPv6(subnet.IP))
if err != nil {
return "", err
}
routes = append(routes, defaultRoute)
ipamConfig, err := NewIPAMHostLocalConf(subnet, routes, ipRange, gateway)
if err != nil {
return "", err
}
// TODO need to iron out the role of isDefaultGW and IPMasq
bridge := NewHostLocalBridge(bridgeDeviceName, isGateway, false, ipMasq, ipamConfig)
plugins = append(plugins, bridge)
plugins = append(plugins, NewPortMapPlugin())
plugins = append(plugins, NewFirewallPlugin())
// if we find the dnsname plugin, we add configuration for it
if HasDNSNamePlugin(runtimeConfig.Network.CNIPluginDirs) && !options.DisableDNS {
// Note: in the future we might like to allow for dynamic domain names
plugins = append(plugins, NewDNSNamePlugin(DefaultPodmanDomainName))
}
ncList["plugins"] = plugins
b, err := json.MarshalIndent(ncList, "", " ")
if err != nil {
return "", err
}
if err := os.MkdirAll(GetCNIConfDir(runtimeConfig), 0755); err != nil {
return "", err
}
cniPathName := filepath.Join(GetCNIConfDir(runtimeConfig), fmt.Sprintf("%s.conflist", name))
err = ioutil.WriteFile(cniPathName, b, 0644)
return cniPathName, err
}
func createMacVLAN(r *libpod.Runtime, name string, options entities.NetworkCreateOptions) (string, error) {
var (
plugins []CNIPlugins
)
liveNetNames, err := GetLiveNetworkNames()
if err != nil {
return "", err
}
config, err := r.GetConfig()
if err != nil {
return "", err
}
// Make sure the host-device exists
if !util.StringInSlice(options.MacVLAN, liveNetNames) {
return "", errors.Errorf("failed to find network interface %q", options.MacVLAN)
}
if len(name) > 0 {
netNames, err := GetNetworkNamesFromFileSystem(config)
if err != nil {
return "", err
}
if util.StringInSlice(name, netNames) {
return "", errors.Errorf("the network name %s is already used", name)
}
} else {
name, err = GetFreeDeviceName(config)
if err != nil {
return "", err
}
}
ncList := NewNcList(name, version.Current())
macvlan := NewMacVLANPlugin(options.MacVLAN)
plugins = append(plugins, macvlan)
ncList["plugins"] = plugins
b, err := json.MarshalIndent(ncList, "", " ")
if err != nil {
return "", err
}
cniPathName := filepath.Join(GetCNIConfDir(config), fmt.Sprintf("%s.conflist", name))
err = ioutil.WriteFile(cniPathName, b, 0644)
return cniPathName, err
}
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