Add the option of Rootless CNI networking by default

cmd/podman/common/create_opts.go

@@ -8,6 +8,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/containers/common/pkg/config"
 	"github.com/containers/podman/v3/cmd/podman/registry"
 	"github.com/containers/podman/v3/pkg/api/handlers"
 	"github.com/containers/podman/v3/pkg/cgroups"
@@ -140,7 +141,7 @@ func stringMaptoArray(m map[string]string) []string {
 
 // ContainerCreateToContainerCLIOpts converts a compat input struct to cliopts so it can be converted to
 // a specgen spec.
-func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, cgroupsManager string) (*ContainerCLIOpts, []string, error) {
+func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, rtc *config.Config) (*ContainerCLIOpts, []string, error) {
 	var (
 		capAdd     []string
 		cappDrop   []string
@@ -248,7 +249,7 @@ func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, cgroup
 	}
 
 	// netMode
-	nsmode, _, err := specgen.ParseNetworkNamespace(string(cc.HostConfig.NetworkMode))
+	nsmode, _, err := specgen.ParseNetworkNamespace(string(cc.HostConfig.NetworkMode), true)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -507,7 +508,7 @@ func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, cgroup
 		cliOpts.Restart = policy
 	}
 
-	if cc.HostConfig.MemorySwappiness != nil && (!rootless.IsRootless() || rootless.IsRootless() && cgroupsv2 && cgroupsManager == "systemd") {
+	if cc.HostConfig.MemorySwappiness != nil && (!rootless.IsRootless() || rootless.IsRootless() && cgroupsv2 && rtc.Engine.CgroupManager == "systemd") {
 		cliOpts.MemorySwappiness = *cc.HostConfig.MemorySwappiness
 	} else {
 		cliOpts.MemorySwappiness = -1

cmd/podman/common/netflags.go

@@ -201,7 +201,7 @@ func NetFlagsToNetOptions(cmd *cobra.Command) (*entities.NetOptions, error) {
 
 		parts := strings.SplitN(network, ":", 2)
 
-		ns, cniNets, err := specgen.ParseNetworkNamespace(network)
+		ns, cniNets, err := specgen.ParseNetworkNamespace(network, containerConfig.Containers.RootlessNetworking == "cni")
 		if err != nil {
 			return nil, err
 		}

libpod/container.go

@@ -14,7 +14,6 @@ import (
 	"github.com/containers/image/v5/manifest"
 	"github.com/containers/podman/v3/libpod/define"
 	"github.com/containers/podman/v3/libpod/lock"
-	"github.com/containers/podman/v3/pkg/rootless"
 	"github.com/containers/storage"
 	"github.com/cri-o/ocicni/pkg/ocicni"
 	spec "github.com/opencontainers/runtime-spec/specs-go"
@@ -1168,7 +1167,7 @@ func (c *Container) Networks() ([]string, bool, error) {
 func (c *Container) networks() ([]string, bool, error) {
 	networks, err := c.runtime.state.GetNetworks(c)
 	if err != nil && errors.Cause(err) == define.ErrNoSuchNetwork {
-		if len(c.config.Networks) == 0 && !rootless.IsRootless() {
+		if len(c.config.Networks) == 0 && c.config.NetMode.IsBridge() {
 			return []string{c.runtime.netPlugin.GetDefaultNetworkName()}, true, nil
 		}
 		return c.config.Networks, false, nil

libpod/runtime.go

@@ -17,6 +17,7 @@ import (
 
 	"github.com/containers/common/libimage"
 	"github.com/containers/common/pkg/config"
+	"github.com/containers/common/pkg/defaultnet"
 	"github.com/containers/common/pkg/secrets"
 	"github.com/containers/image/v5/pkg/sysregistriesv2"
 	is "github.com/containers/image/v5/storage"
@@ -458,6 +459,11 @@ func makeRuntime(ctx context.Context, runtime *Runtime) (retErr error) {
 		}
 	}
 
+	// If we need to make a default network - do so now.
+	if err := defaultnet.Create(runtime.config.Network.DefaultNetwork, runtime.config.Network.DefaultSubnet, runtime.config.Network.NetworkConfigDir, runtime.config.Engine.StaticDir, runtime.config.Engine.MachineEnabled); err != nil {
+		logrus.Errorf("Failed to created default CNI network: %v", err)
+	}
+
 	// Set up the CNI net plugin
 	netPlugin, err := ocicni.InitCNI(runtime.config.Network.DefaultNetwork, runtime.config.Network.NetworkConfigDir, runtime.config.Network.CNIPluginDirs...)
 	if err != nil {

pkg/api/handlers/compat/containers_create.go

@@ -62,7 +62,7 @@ func CreateContainer(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Take body structure and convert to cliopts
-	cliOpts, args, err := common.ContainerCreateToContainerCLIOpts(body, rtc.Engine.CgroupManager)
+	cliOpts, args, err := common.ContainerCreateToContainerCLIOpts(body, rtc)
 	if err != nil {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "make cli opts()"))
 		return

pkg/specgen/generate/namespaces.go

@@ -66,7 +66,7 @@ func GetDefaultNamespaceMode(nsType string, cfg *config.Config, pod *libpod.Pod)
 	case "cgroup":
 		return specgen.ParseCgroupNamespace(cfg.Containers.CgroupNS)
 	case "net":
-		ns, _, err := specgen.ParseNetworkNamespace(cfg.Containers.NetNS)
+		ns, _, err := specgen.ParseNetworkNamespace(cfg.Containers.NetNS, cfg.Containers.RootlessNetworking == "cni")
 		return ns, err
 	}
 

pkg/specgen/namespaces.go

@@ -253,7 +253,7 @@ func ParseUserNamespace(ns string) (Namespace, error) {
 // ParseNetworkNamespace parses a network namespace specification in string
 // form.
 // Returns a namespace and (optionally) a list of CNI networks to join.
-func ParseNetworkNamespace(ns string) (Namespace, []string, error) {
+func ParseNetworkNamespace(ns string, rootlessDefaultCNI bool) (Namespace, []string, error) {
 	toReturn := Namespace{}
 	var cniNetworks []string
 	// Net defaults to Slirp on rootless
@@ -264,7 +264,11 @@ func ParseNetworkNamespace(ns string) (Namespace, []string, error) {
 		toReturn.NSMode = FromPod
 	case ns == "" || ns == string(Default) || ns == string(Private):
 		if rootless.IsRootless() {
-			toReturn.NSMode = Slirp
+			if rootlessDefaultCNI {
+				toReturn.NSMode = Bridge
+			} else {
+				toReturn.NSMode = Slirp
+			}
 		} else {
 			toReturn.NSMode = Bridge
 		}

test/e2e/run_networking_test.go

@@ -786,4 +786,18 @@ var _ = Describe("Podman run networking", func() {
 		Expect(session.ExitCode()).To(BeZero())
 		Expect(session.OutputToString()).To(ContainSubstring("search dns.podman"))
 	})
+
+	It("Rootless podman run with --net=bridge works and connects to default network", func() {
+		// This is harmless when run as root, so we'll just let it run.
+		ctrName := "testctr"
+		ctr := podmanTest.Podman([]string{"run", "-d", "--net=bridge", "--name", ctrName, ALPINE, "top"})
+		ctr.WaitWithDefaultTimeout()
+		Expect(ctr.ExitCode()).To(BeZero())
+
+		inspectOut := podmanTest.InspectContainer(ctrName)
+		Expect(len(inspectOut)).To(Equal(1))
+		Expect(len(inspectOut[0].NetworkSettings.Networks)).To(Equal(1))
+		_, ok := inspectOut[0].NetworkSettings.Networks["podman"]
+		Expect(ok).To(BeTrue())
+	})
 })

vendor/modules.txt

@@ -102,6 +102,7 @@ github.com/containers/common/pkg/cgroupv2
 github.com/containers/common/pkg/chown
 github.com/containers/common/pkg/completion
 github.com/containers/common/pkg/config
+github.com/containers/common/pkg/defaultnet
 github.com/containers/common/pkg/filters
 github.com/containers/common/pkg/manifests
 github.com/containers/common/pkg/parse