package network import ( "fmt" "net" "strings" "github.com/docker/cli/cli" "github.com/docker/cli/cli/command" "github.com/docker/cli/opts" "github.com/docker/docker/api/types" "github.com/docker/docker/api/types/network" "github.com/pkg/errors" "github.com/spf13/cobra" "golang.org/x/net/context" ) type createOptions struct { name string scope string driver string driverOpts opts.MapOpts labels opts.ListOpts internal bool ipv6 bool attachable bool ingress bool configOnly bool configFrom string ipamDriver string ipamSubnet []string ipamIPRange []string ipamGateway []string ipamAux opts.MapOpts ipamOpt opts.MapOpts } func newCreateCommand(dockerCli *command.DockerCli) *cobra.Command { options := createOptions{ driverOpts: *opts.NewMapOpts(nil, nil), labels: opts.NewListOpts(opts.ValidateEnv), ipamAux: *opts.NewMapOpts(nil, nil), ipamOpt: *opts.NewMapOpts(nil, nil), } cmd := &cobra.Command{ Use: "create [OPTIONS] NETWORK", Short: "Create a network", Args: cli.ExactArgs(1), RunE: func(cmd *cobra.Command, args []string) error { options.name = args[0] return runCreate(dockerCli, options) }, } flags := cmd.Flags() flags.StringVarP(&options.driver, "driver", "d", "bridge", "Driver to manage the Network") flags.VarP(&options.driverOpts, "opt", "o", "Set driver specific options") flags.Var(&options.labels, "label", "Set metadata on a network") flags.BoolVar(&options.internal, "internal", false, "Restrict external access to the network") flags.BoolVar(&options.ipv6, "ipv6", false, "Enable IPv6 networking") flags.BoolVar(&options.attachable, "attachable", false, "Enable manual container attachment") flags.SetAnnotation("attachable", "version", []string{"1.25"}) flags.BoolVar(&options.ingress, "ingress", false, "Create swarm routing-mesh network") flags.SetAnnotation("ingress", "version", []string{"1.29"}) flags.StringVar(&options.scope, "scope", "", "Control the network's scope") flags.SetAnnotation("scope", "version", []string{"1.30"}) flags.BoolVar(&options.configOnly, "config-only", false, "Create a configuration only network") flags.SetAnnotation("config-only", "version", []string{"1.30"}) flags.StringVar(&options.configFrom, "config-from", "", "The network from which copying the configuration") flags.SetAnnotation("config-from", "version", []string{"1.30"}) flags.StringVar(&options.ipamDriver, "ipam-driver", "default", "IP Address Management Driver") flags.StringSliceVar(&options.ipamSubnet, "subnet", []string{}, "Subnet in CIDR format that represents a network segment") flags.StringSliceVar(&options.ipamIPRange, "ip-range", []string{}, "Allocate container ip from a sub-range") flags.StringSliceVar(&options.ipamGateway, "gateway", []string{}, "IPv4 or IPv6 Gateway for the master subnet") flags.Var(&options.ipamAux, "aux-address", "Auxiliary IPv4 or IPv6 addresses used by Network driver") flags.Var(&options.ipamOpt, "ipam-opt", "Set IPAM driver specific options") return cmd } func runCreate(dockerCli *command.DockerCli, options createOptions) error { client := dockerCli.Client() ipamCfg, err := consolidateIpam(options.ipamSubnet, options.ipamIPRange, options.ipamGateway, options.ipamAux.GetAll()) if err != nil { return err } // Construct network create request body nc := types.NetworkCreate{ Driver: options.driver, Options: options.driverOpts.GetAll(), IPAM: &network.IPAM{ Driver: options.ipamDriver, Config: ipamCfg, Options: options.ipamOpt.GetAll(), }, CheckDuplicate: true, Internal: options.internal, EnableIPv6: options.ipv6, Attachable: options.attachable, Ingress: options.ingress, Scope: options.scope, ConfigOnly: options.configOnly, Labels: opts.ConvertKVStringsToMap(options.labels.GetAll()), } if from := options.configFrom; from != "" { nc.ConfigFrom = &network.ConfigReference{ Network: from, } } resp, err := client.NetworkCreate(context.Background(), options.name, nc) if err != nil { return err } fmt.Fprintf(dockerCli.Out(), "%s\n", resp.ID) return nil } // Consolidates the ipam configuration as a group from different related configurations // user can configure network with multiple non-overlapping subnets and hence it is // possible to correlate the various related parameters and consolidate them. // consolidateIpam consolidates subnets, ip-ranges, gateways and auxiliary addresses into // structured ipam data. // nolint: gocyclo func consolidateIpam(subnets, ranges, gateways []string, auxaddrs map[string]string) ([]network.IPAMConfig, error) { if len(subnets) < len(ranges) || len(subnets) < len(gateways) { return nil, errors.Errorf("every ip-range or gateway must have a corresponding subnet") } iData := map[string]*network.IPAMConfig{} // Populate non-overlapping subnets into consolidation map for _, s := range subnets { for k := range iData { ok1, err := subnetMatches(s, k) if err != nil { return nil, err } ok2, err := subnetMatches(k, s) if err != nil { return nil, err } if ok1 || ok2 { return nil, errors.Errorf("multiple overlapping subnet configuration is not supported") } } iData[s] = &network.IPAMConfig{Subnet: s, AuxAddress: map[string]string{}} } // Validate and add valid ip ranges for _, r := range ranges { match := false for _, s := range subnets { ok, err := subnetMatches(s, r) if err != nil { return nil, err } if !ok { continue } if iData[s].IPRange != "" { return nil, errors.Errorf("cannot configure multiple ranges (%s, %s) on the same subnet (%s)", r, iData[s].IPRange, s) } d := iData[s] d.IPRange = r match = true } if !match { return nil, errors.Errorf("no matching subnet for range %s", r) } } // Validate and add valid gateways for _, g := range gateways { match := false for _, s := range subnets { ok, err := subnetMatches(s, g) if err != nil { return nil, err } if !ok { continue } if iData[s].Gateway != "" { return nil, errors.Errorf("cannot configure multiple gateways (%s, %s) for the same subnet (%s)", g, iData[s].Gateway, s) } d := iData[s] d.Gateway = g match = true } if !match { return nil, errors.Errorf("no matching subnet for gateway %s", g) } } // Validate and add aux-addresses for key, aa := range auxaddrs { match := false for _, s := range subnets { ok, err := subnetMatches(s, aa) if err != nil { return nil, err } if !ok { continue } iData[s].AuxAddress[key] = aa match = true } if !match { return nil, errors.Errorf("no matching subnet for aux-address %s", aa) } } idl := []network.IPAMConfig{} for _, v := range iData { idl = append(idl, *v) } return idl, nil } func subnetMatches(subnet, data string) (bool, error) { var ( ip net.IP ) _, s, err := net.ParseCIDR(subnet) if err != nil { return false, errors.Errorf("Invalid subnet %s : %v", s, err) } if strings.Contains(data, "/") { ip, _, err = net.ParseCIDR(data) if err != nil { return false, errors.Errorf("Invalid cidr %s : %v", data, err) } } else { ip = net.ParseIP(data) } return s.Contains(ip), nil }