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package network
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/containernetworking/cni/pkg/version"
"github.com/containers/common/pkg/config"
"github.com/containers/podman/v2/pkg/domain/entities"
"github.com/containers/podman/v2/pkg/rootless"
"github.com/containers/podman/v2/pkg/util"
"github.com/pkg/errors"
)
// Create the CNI network
func Create(name string, options entities.NetworkCreateOptions, runtimeConfig *config.Config) (*entities.NetworkCreateReport, error) {
var fileName string
if err := isSupportedDriver(options.Driver); err != nil {
return nil, err
}
// Acquire a lock for CNI
l, err := acquireCNILock(filepath.Join(runtimeConfig.Engine.TmpDir, LockFileName))
if err != nil {
return nil, err
}
defer l.releaseCNILock()
if len(options.MacVLAN) > 0 {
fileName, err = createMacVLAN(name, options, runtimeConfig)
} else {
fileName, err = createBridge(name, options, runtimeConfig)
}
if err != nil {
return nil, err
}
return &entities.NetworkCreateReport{Filename: fileName}, nil
}
// validateBridgeOptions validate the bridge networking options
func validateBridgeOptions(options entities.NetworkCreateOptions) error {
subnet := &options.Subnet
ipRange := &options.Range
gateway := options.Gateway
// if IPv6 is set an IPv6 subnet MUST be specified
if options.IPv6 && ((subnet.IP == nil) || (subnet.IP != nil && !IsIPv6(subnet.IP))) {
return errors.Errorf("ipv6 option requires an IPv6 --subnet to be provided")
}
// range and gateway depend on subnet
if subnet.IP == nil && (ipRange.IP != nil || gateway != nil) {
return errors.Errorf("every ip-range or gateway must have a corresponding subnet")
}
// if a range is given, we need to ensure it is "in" the network range.
if ipRange.IP != nil {
firstIP, err := FirstIPInSubnet(ipRange)
if err != nil {
return errors.Wrapf(err, "failed to get first IP address from ip-range")
}
lastIP, err := LastIPInSubnet(ipRange)
if err != nil {
return errors.Wrapf(err, "failed to get last IP address from ip-range")
}
if !subnet.Contains(firstIP) || !subnet.Contains(lastIP) {
return errors.Errorf("the ip range %s does not fall within the subnet range %s", ipRange.String(), subnet.String())
}
}
// if network is provided and if gateway is provided, make sure it is "in" network
if gateway != nil && !subnet.Contains(gateway) {
return errors.Errorf("gateway %s is not in valid for subnet %s", gateway.String(), subnet.String())
}
return nil
}
// createBridge creates a CNI network
func createBridge(name string, options entities.NetworkCreateOptions, runtimeConfig *config.Config) (string, error) {
var (
ipamRanges [][]IPAMLocalHostRangeConf
err error
routes []IPAMRoute
)
isGateway := true
ipMasq := true
// validate options
if err := validateBridgeOptions(options); err != nil {
return "", err
}
// For compatibility with the docker implementation:
// if IPv6 is enabled (it really means dual-stack) then an IPv6 subnet has to be provided, and one free network is allocated for IPv4
// if IPv6 is not specified the subnet may be specified and can be either IPv4 or IPv6 (podman, unlike docker, allows IPv6 only networks)
// If not subnet is specified an IPv4 subnet will be allocated
subnet := &options.Subnet
ipRange := &options.Range
gateway := options.Gateway
if subnet.IP != nil {
// if network is provided, does it conflict with existing CNI or live networks
err = ValidateUserNetworkIsAvailable(runtimeConfig, subnet)
if err != nil {
return "", err
}
// obtain CNI subnet default route
defaultRoute, err := NewIPAMDefaultRoute(IsIPv6(subnet.IP))
if err != nil {
return "", err
}
routes = append(routes, defaultRoute)
// obtain CNI range
ipamRange, err := NewIPAMLocalHostRange(subnet, ipRange, gateway)
if err != nil {
return "", err
}
ipamRanges = append(ipamRanges, ipamRange)
}
// if no network is provided or IPv6 flag used, figure out the IPv4 network
if options.IPv6 || len(routes) == 0 {
subnetV4, err := GetFreeNetwork(runtimeConfig)
if err != nil {
return "", err
}
// obtain IPv4 default route
defaultRoute, err := NewIPAMDefaultRoute(false)
if err != nil {
return "", err
}
routes = append(routes, defaultRoute)
// the CNI bridge plugin does not need to set
// the range or gateway options explicitly
ipamRange, err := NewIPAMLocalHostRange(subnetV4, nil, nil)
if err != nil {
return "", err
}
ipamRanges = append(ipamRanges, ipamRange)
}
// create CNI config
ipamConfig, err := NewIPAMHostLocalConf(routes, ipamRanges)
if err != nil {
return "", err
}
if options.Internal {
isGateway = false
ipMasq = false
}
// obtain host bridge name
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
}
// create CNI plugin configuration
ncList := NewNcList(name, version.Current(), options.Labels)
var plugins []CNIPlugins
// 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())
plugins = append(plugins, NewTuningPlugin())
// if we find the dnsname plugin or are rootless, we add configuration for it
// the rootless-cni-infra container has the dnsname plugin always installed
if (HasDNSNamePlugin(runtimeConfig.Network.CNIPluginDirs) || rootless.IsRootless()) && !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(name string, options entities.NetworkCreateOptions, runtimeConfig *config.Config) (string, error) {
var (
plugins []CNIPlugins
)
liveNetNames, err := GetLiveNetworkNames()
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(runtimeConfig)
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(runtimeConfig)
if err != nil {
return "", err
}
}
ncList := NewNcList(name, version.Current(), options.Labels)
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(runtimeConfig), fmt.Sprintf("%s.conflist", name))
err = ioutil.WriteFile(cniPathName, b, 0644)
return cniPathName, err
}
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