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Diffstat (limited to 'libpod/rootless_cni_linux.go')
-rw-r--r--libpod/rootless_cni_linux.go320
1 files changed, 320 insertions, 0 deletions
diff --git a/libpod/rootless_cni_linux.go b/libpod/rootless_cni_linux.go
new file mode 100644
index 000000000..76dbfdcae
--- /dev/null
+++ b/libpod/rootless_cni_linux.go
@@ -0,0 +1,320 @@
+// +build linux
+
+package libpod
+
+import (
+ "bytes"
+ "context"
+ "io"
+ "path/filepath"
+ "runtime"
+
+ cnitypes "github.com/containernetworking/cni/pkg/types/current"
+ "github.com/containernetworking/plugins/pkg/ns"
+ "github.com/containers/podman/v2/libpod/define"
+ "github.com/containers/podman/v2/libpod/image"
+ "github.com/containers/podman/v2/pkg/util"
+ "github.com/containers/storage/pkg/lockfile"
+ "github.com/hashicorp/go-multierror"
+ spec "github.com/opencontainers/runtime-spec/specs-go"
+ "github.com/opencontainers/runtime-tools/generate"
+ "github.com/pkg/errors"
+ "github.com/sirupsen/logrus"
+)
+
+var rootlessCNIInfraImage = map[string]string{
+ // Built from ../contrib/rootless-cni-infra
+ // TODO: move to Podman's official quay
+ "amd64": "ghcr.io/akihirosuda/podman-rootless-cni-infra:gd34868a13-amd64",
+}
+
+const (
+ rootlessCNIInfraContainerNamespace = "podman-system"
+ rootlessCNIInfraContainerName = "rootless-cni-infra"
+)
+
+// AllocRootlessCNI allocates a CNI netns inside the rootless CNI infra container.
+// Locks "rootless-cni-infra.lck".
+//
+// When the infra container is not running, it is created.
+//
+// AllocRootlessCNI does not lock c. c should be already locked.
+func AllocRootlessCNI(ctx context.Context, c *Container) (ns.NetNS, []*cnitypes.Result, error) {
+ if len(c.config.Networks) == 0 {
+ return nil, nil, errors.New("allocRootlessCNI shall not be called when len(c.config.Networks) == 0")
+ }
+ l, err := getRootlessCNIInfraLock(c.runtime)
+ if err != nil {
+ return nil, nil, err
+ }
+ l.Lock()
+ defer l.Unlock()
+ infra, err := ensureRootlessCNIInfraContainerRunning(ctx, c.runtime)
+ if err != nil {
+ return nil, nil, err
+ }
+ k8sPodName := getPodOrContainerName(c) // passed to CNI as K8S_POD_NAME
+ cniResults := make([]*cnitypes.Result, len(c.config.Networks))
+ for i, nw := range c.config.Networks {
+ cniRes, err := rootlessCNIInfraCallAlloc(infra, c.ID(), nw, k8sPodName)
+ if err != nil {
+ return nil, nil, err
+ }
+ cniResults[i] = cniRes
+ }
+ nsObj, err := rootlessCNIInfraGetNS(infra, c.ID())
+ if err != nil {
+ return nil, nil, err
+ }
+ logrus.Debugf("rootless CNI: container %q will join %q", c.ID(), nsObj.Path())
+ return nsObj, cniResults, nil
+}
+
+// DeallocRootlessCNI deallocates a CNI netns inside the rootless CNI infra container.
+// Locks "rootless-cni-infra.lck".
+//
+// When the infra container is no longer needed, it is removed.
+//
+// DeallocRootlessCNI does not lock c. c should be already locked.
+func DeallocRootlessCNI(ctx context.Context, c *Container) error {
+ if len(c.config.Networks) == 0 {
+ return errors.New("deallocRootlessCNI shall not be called when len(c.config.Networks) == 0")
+ }
+ l, err := getRootlessCNIInfraLock(c.runtime)
+ if err != nil {
+ return err
+ }
+ l.Lock()
+ defer l.Unlock()
+ infra, _ := getRootlessCNIInfraContainer(c.runtime)
+ if infra == nil {
+ return nil
+ }
+ var errs *multierror.Error
+ for _, nw := range c.config.Networks {
+ err := rootlessCNIInfraCallDelloc(infra, c.ID(), nw)
+ if err != nil {
+ errs = multierror.Append(errs, err)
+ }
+ }
+ if isIdle, err := rootlessCNIInfraIsIdle(infra); isIdle || err != nil {
+ if err != nil {
+ logrus.Warn(err)
+ }
+ logrus.Debugf("rootless CNI: removing infra container %q", infra.ID())
+ if err := c.runtime.removeContainer(ctx, infra, true, false, true); err != nil {
+ return err
+ }
+ logrus.Debugf("rootless CNI: removed infra container %q", infra.ID())
+ }
+ return errs.ErrorOrNil()
+}
+
+func getRootlessCNIInfraLock(r *Runtime) (lockfile.Locker, error) {
+ fname := filepath.Join(r.config.Engine.TmpDir, "rootless-cni-infra.lck")
+ return lockfile.GetLockfile(fname)
+}
+
+func getPodOrContainerName(c *Container) string {
+ pod, err := c.runtime.GetPod(c.PodID())
+ if err != nil || pod.config.Name == "" {
+ return c.Name()
+ }
+ return pod.config.Name
+}
+
+func rootlessCNIInfraCallAlloc(infra *Container, id, nw, k8sPodName string) (*cnitypes.Result, error) {
+ logrus.Debugf("rootless CNI: alloc %q, %q, %q", id, nw, k8sPodName)
+ var err error
+
+ _, err = rootlessCNIInfraExec(infra, "alloc", id, nw, k8sPodName)
+ if err != nil {
+ return nil, err
+ }
+ cniResStr, err := rootlessCNIInfraExec(infra, "print-cni-result", id, nw)
+ if err != nil {
+ return nil, err
+ }
+ var cniRes cnitypes.Result
+ if err := json.Unmarshal([]byte(cniResStr), &cniRes); err != nil {
+ return nil, errors.Wrapf(err, "unmarshaling as cnitypes.Result: %q", cniResStr)
+ }
+ return &cniRes, nil
+}
+
+func rootlessCNIInfraCallDelloc(infra *Container, id, nw string) error {
+ logrus.Debugf("rootless CNI: dealloc %q, %q", id, nw)
+ _, err := rootlessCNIInfraExec(infra, "dealloc", id, nw)
+ return err
+}
+
+func rootlessCNIInfraIsIdle(infra *Container) (bool, error) {
+ type isIdle struct {
+ Idle bool `json:"idle"`
+ }
+ resStr, err := rootlessCNIInfraExec(infra, "is-idle")
+ if err != nil {
+ return false, err
+ }
+ var res isIdle
+ if err := json.Unmarshal([]byte(resStr), &res); err != nil {
+ return false, errors.Wrapf(err, "unmarshaling as isIdle: %q", resStr)
+ }
+ return res.Idle, nil
+}
+
+func rootlessCNIInfraGetNS(infra *Container, id string) (ns.NetNS, error) {
+ type printNetnsPath struct {
+ Path string `json:"path"`
+ }
+ resStr, err := rootlessCNIInfraExec(infra, "print-netns-path", id)
+ if err != nil {
+ return nil, err
+ }
+ var res printNetnsPath
+ if err := json.Unmarshal([]byte(resStr), &res); err != nil {
+ return nil, errors.Wrapf(err, "unmarshaling as printNetnsPath: %q", resStr)
+ }
+ nsObj, err := ns.GetNS(res.Path)
+ if err != nil {
+ return nil, err
+ }
+ return nsObj, nil
+}
+
+func getRootlessCNIInfraContainer(r *Runtime) (*Container, error) {
+ containers, err := r.GetContainersWithoutLock(func(c *Container) bool {
+ return c.Namespace() == rootlessCNIInfraContainerNamespace &&
+ c.Name() == rootlessCNIInfraContainerName
+ })
+ if err != nil {
+ return nil, err
+ }
+ if len(containers) == 0 {
+ return nil, nil
+ }
+ return containers[0], nil
+}
+
+func ensureRootlessCNIInfraContainerRunning(ctx context.Context, r *Runtime) (*Container, error) {
+ c, err := getRootlessCNIInfraContainer(r)
+ if err != nil {
+ return nil, err
+ }
+ if c == nil {
+ return startRootlessCNIInfraContainer(ctx, r)
+ }
+ st, err := c.ContainerState()
+ if err != nil {
+ return nil, err
+ }
+ if st.State == define.ContainerStateRunning {
+ logrus.Debugf("rootless CNI: infra container %q is already running", c.ID())
+ return c, nil
+ }
+ logrus.Debugf("rootless CNI: infra container %q is %q, being started", c.ID(), st.State)
+ if err := c.initAndStart(ctx); err != nil {
+ return nil, err
+ }
+ logrus.Debugf("rootless CNI: infra container %q is running", c.ID())
+ return c, nil
+}
+
+func startRootlessCNIInfraContainer(ctx context.Context, r *Runtime) (*Container, error) {
+ imageName, ok := rootlessCNIInfraImage[runtime.GOARCH]
+ if !ok {
+ return nil, errors.Errorf("cannot find rootless-podman-network-sandbox image for %s", runtime.GOARCH)
+ }
+ logrus.Debugf("rootless CNI: ensuring image %q to exist", imageName)
+ newImage, err := r.ImageRuntime().New(ctx, imageName, "", "", nil, nil,
+ image.SigningOptions{}, nil, util.PullImageMissing)
+ if err != nil {
+ return nil, err
+ }
+ logrus.Debugf("rootless CNI: image %q is ready", imageName)
+
+ g, err := generate.New("linux")
+ if err != nil {
+ return nil, err
+ }
+ g.SetupPrivileged(true)
+ // Set --pid=host for ease of propagating "/proc/PID/ns/net" string
+ if err := g.RemoveLinuxNamespace(string(spec.PIDNamespace)); err != nil {
+ return nil, err
+ }
+ g.RemoveMount("/proc")
+ procMount := spec.Mount{
+ Destination: "/proc",
+ Type: "bind",
+ Source: "/proc",
+ Options: []string{"rbind", "nosuid", "noexec", "nodev"},
+ }
+ g.AddMount(procMount)
+ // Mount CNI networks
+ etcCNINetD := spec.Mount{
+ Destination: "/etc/cni/net.d",
+ Type: "bind",
+ Source: r.config.Network.NetworkConfigDir,
+ Options: []string{"ro"},
+ }
+ g.AddMount(etcCNINetD)
+ // FIXME: how to propagate ProcessArgs and Envs from Dockerfile?
+ g.SetProcessArgs([]string{"sleep", "infinity"})
+ g.AddProcessEnv("CNI_PATH", "/opt/cni/bin")
+ var options []CtrCreateOption
+ options = append(options, WithRootFSFromImage(newImage.ID(), imageName, imageName))
+ options = append(options, WithCtrNamespace(rootlessCNIInfraContainerNamespace))
+ options = append(options, WithName(rootlessCNIInfraContainerName))
+ options = append(options, WithPrivileged(true))
+ options = append(options, WithSecLabels([]string{"disable"}))
+ options = append(options, WithRestartPolicy("always"))
+ options = append(options, WithNetNS(nil, false, "slirp4netns", nil))
+ c, err := r.NewContainer(ctx, g.Config, options...)
+ if err != nil {
+ return nil, err
+ }
+ logrus.Debugf("rootless CNI infra container %q is created, now being started", c.ID())
+ if err := c.initAndStart(ctx); err != nil {
+ return nil, err
+ }
+ logrus.Debugf("rootless CNI: infra container %q is running", c.ID())
+
+ return c, nil
+}
+
+func rootlessCNIInfraExec(c *Container, args ...string) (string, error) {
+ cmd := "rootless-cni-infra"
+ var (
+ outB bytes.Buffer
+ errB bytes.Buffer
+ streams define.AttachStreams
+ config ExecConfig
+ )
+ streams.OutputStream = &nopWriteCloser{Writer: &outB}
+ streams.ErrorStream = &nopWriteCloser{Writer: &errB}
+ streams.AttachOutput = true
+ streams.AttachError = true
+ config.Command = append([]string{cmd}, args...)
+ config.Privileged = true
+ logrus.Debugf("rootlessCNIInfraExec: c.ID()=%s, config=%+v, streams=%v, begin",
+ c.ID(), config, streams)
+ code, err := c.Exec(&config, &streams, nil)
+ logrus.Debugf("rootlessCNIInfraExec: c.ID()=%s, config=%+v, streams=%v, end (code=%d, err=%v)",
+ c.ID(), config, streams, code, err)
+ if err != nil {
+ return "", err
+ }
+ if code != 0 {
+ return "", errors.Errorf("command %s %v in container %s failed with status %d, stdout=%q, stderr=%q",
+ cmd, args, c.ID(), code, outB.String(), errB.String())
+ }
+ return outB.String(), nil
+}
+
+type nopWriteCloser struct {
+ io.Writer
+}
+
+func (nwc *nopWriteCloser) Close() error {
+ return nil
+}