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Diffstat (limited to 'libpod/networking_linux.go')
-rw-r--r--libpod/networking_linux.go219
1 files changed, 108 insertions, 111 deletions
diff --git a/libpod/networking_linux.go b/libpod/networking_linux.go
index 29d51f96c..035fb5832 100644
--- a/libpod/networking_linux.go
+++ b/libpod/networking_linux.go
@@ -41,8 +41,11 @@ const (
// default slirp4ns subnet
defaultSlirp4netnsSubnet = "10.0.2.0/24"
- // rootlessCNINSName is the file name for the rootless network namespace bind mount
- rootlessCNINSName = "rootless-cni-ns"
+ // rootlessNetNsName is the file name for the rootless network namespace bind mount
+ rootlessNetNsName = "rootless-netns"
+
+ // rootlessNetNsSilrp4netnsPidFile is the name of the rootless netns slirp4netns pid file
+ rootlessNetNsSilrp4netnsPidFile = "rootless-netns-slirp4netns.pid"
// persistentCNIDir is the directory where the CNI files are stored
persistentCNIDir = "/var/lib/cni"
@@ -136,21 +139,21 @@ func (c *Container) getNetworkOptions() (types.NetworkOptions, error) {
return opts, nil
}
-type RootlessCNI struct {
+type RootlessNetNS struct {
ns ns.NetNS
dir string
Lock lockfile.Locker
}
-// getPath will join the given path to the rootless cni dir
-func (r *RootlessCNI) getPath(path string) string {
+// getPath will join the given path to the rootless netns dir
+func (r *RootlessNetNS) getPath(path string) string {
return filepath.Join(r.dir, path)
}
-// Do - run the given function in the rootless cni ns.
+// Do - run the given function in the rootless netns.
// It does not lock the rootlessCNI lock, the caller
// should only lock when needed, e.g. for cni operations.
-func (r *RootlessCNI) Do(toRun func() error) error {
+func (r *RootlessNetNS) Do(toRun func() error) error {
err := r.ns.Do(func(_ ns.NetNS) error {
// Before we can run the given function,
// we have to setup all mounts correctly.
@@ -161,11 +164,11 @@ func (r *RootlessCNI) Do(toRun func() error) error {
// Because the plugins also need access to XDG_RUNTIME_DIR/netns some special setup is needed.
// The following bind mounts are needed
- // 1. XDG_RUNTIME_DIR -> XDG_RUNTIME_DIR/rootless-cni/XDG_RUNTIME_DIR
- // 2. /run/systemd -> XDG_RUNTIME_DIR/rootless-cni/run/systemd (only if it exists)
- // 3. XDG_RUNTIME_DIR/rootless-cni/resolv.conf -> /etc/resolv.conf or XDG_RUNTIME_DIR/rootless-cni/run/symlink/target
- // 4. XDG_RUNTIME_DIR/rootless-cni/var/lib/cni -> /var/lib/cni (if /var/lib/cni does not exists use the parent dir)
- // 5. XDG_RUNTIME_DIR/rootless-cni/run -> /run
+ // 1. XDG_RUNTIME_DIR -> XDG_RUNTIME_DIR/rootless-netns/XDG_RUNTIME_DIR
+ // 2. /run/systemd -> XDG_RUNTIME_DIR/rootless-netns/run/systemd (only if it exists)
+ // 3. XDG_RUNTIME_DIR/rootless-netns/resolv.conf -> /etc/resolv.conf or XDG_RUNTIME_DIR/rootless-netns/run/symlink/target
+ // 4. XDG_RUNTIME_DIR/rootless-netns/var/lib/cni -> /var/lib/cni (if /var/lib/cni does not exists use the parent dir)
+ // 5. XDG_RUNTIME_DIR/rootless-netns/run -> /run
// Create a new mount namespace,
// this must happen inside the netns thread.
@@ -183,7 +186,7 @@ func (r *RootlessCNI) Do(toRun func() error) error {
// Otherwise cni setup will fail because it cannot access the netns files.
err = unix.Mount(xdgRuntimeDir, newXDGRuntimeDir, "none", unix.MS_BIND|unix.MS_SHARED|unix.MS_REC, "")
if err != nil {
- return errors.Wrap(err, "failed to mount runtime directory for rootless cni")
+ return errors.Wrap(err, "failed to mount runtime directory for rootless netns")
}
// 2. Also keep /run/systemd if it exists.
@@ -194,7 +197,7 @@ func (r *RootlessCNI) Do(toRun func() error) error {
newRunSystemd := r.getPath(runSystemd)
err = unix.Mount(runSystemd, newRunSystemd, "none", unix.MS_BIND|unix.MS_REC, "")
if err != nil {
- return errors.Wrap(err, "failed to mount /run/systemd directory for rootless cni")
+ return errors.Wrap(err, "failed to mount /run/systemd directory for rootless netns")
}
}
@@ -242,25 +245,25 @@ func (r *RootlessCNI) Do(toRun func() error) error {
rsr := r.getPath("/run/systemd/resolve")
err = unix.Mount("", rsr, "tmpfs", unix.MS_NOEXEC|unix.MS_NOSUID|unix.MS_NODEV, "")
if err != nil {
- return errors.Wrapf(err, "failed to mount tmpfs on %q for rootless cni", rsr)
+ return errors.Wrapf(err, "failed to mount tmpfs on %q for rootless netns", rsr)
}
}
if strings.HasPrefix(resolvePath, "/run/") {
resolvePath = r.getPath(resolvePath)
err = os.MkdirAll(filepath.Dir(resolvePath), 0700)
if err != nil {
- return errors.Wrap(err, "failed to create rootless-cni resolv.conf directory")
+ return errors.Wrap(err, "failed to create rootless-netns resolv.conf directory")
}
// we want to bind mount on this file so we have to create the file first
_, err = os.OpenFile(resolvePath, os.O_CREATE|os.O_RDONLY, 0700)
if err != nil {
- return errors.Wrap(err, "failed to create rootless-cni resolv.conf file")
+ return errors.Wrap(err, "failed to create rootless-netns resolv.conf file")
}
}
// mount resolv.conf to make use of the host dns
err = unix.Mount(r.getPath("resolv.conf"), resolvePath, "none", unix.MS_BIND, "")
if err != nil {
- return errors.Wrap(err, "failed to mount resolv.conf for rootless cni")
+ return errors.Wrap(err, "failed to mount resolv.conf for rootless netns")
}
// 4. CNI plugins need access to /var/lib/cni and /run
@@ -285,14 +288,14 @@ func (r *RootlessCNI) Do(toRun func() error) error {
// make sure to mount var first
err = unix.Mount(varDir, varTarget, "none", unix.MS_BIND, "")
if err != nil {
- return errors.Wrapf(err, "failed to mount %s for rootless cni", varTarget)
+ return errors.Wrapf(err, "failed to mount %s for rootless netns", varTarget)
}
// 5. Mount the new prepared run dir to /run, it has to be recursive to keep the other bind mounts.
runDir := r.getPath("run")
err = unix.Mount(runDir, "/run", "none", unix.MS_BIND|unix.MS_REC, "")
if err != nil {
- return errors.Wrap(err, "failed to mount /run for rootless cni")
+ return errors.Wrap(err, "failed to mount /run for rootless netns")
}
// run the given function in the correct namespace
@@ -302,10 +305,11 @@ func (r *RootlessCNI) Do(toRun func() error) error {
return err
}
-// Cleanup the rootless cni namespace if needed.
+// Cleanup the rootless network namespace if needed.
// It checks if we have running containers with the bridge network mode.
-// Cleanup() will try to lock RootlessCNI, therefore you have to call it with an unlocked
-func (r *RootlessCNI) Cleanup(runtime *Runtime) error {
+// Cleanup() will try to lock RootlessNetNS, therefore you have to call
+// it with an unlocked lock.
+func (r *RootlessNetNS) Cleanup(runtime *Runtime) error {
_, err := os.Stat(r.dir)
if os.IsNotExist(err) {
// the directory does not exists no need for cleanup
@@ -340,96 +344,89 @@ func (r *RootlessCNI) Cleanup(runtime *Runtime) error {
if err != nil {
return err
}
- // cleanup if we found no containers
- if len(ctrs) == 0 {
- // make sure the the cni results (cache) dir is empty
- // libpod instances with another root dir are not covered by the check above
- // this allows several libpod instances to use the same rootless cni ns
- contents, err := ioutil.ReadDir(r.getPath("var/lib/cni/results"))
- if (err == nil && len(contents) == 0) || os.IsNotExist(err) {
- logrus.Debug("Cleaning up rootless cni namespace")
- err = netns.UnmountNS(r.ns)
- if err != nil {
- return err
- }
- // make the following errors not fatal
- err = r.ns.Close()
- if err != nil {
- logrus.Error(err)
- }
- b, err := ioutil.ReadFile(r.getPath("rootless-cni-slirp4netns.pid"))
- if err == nil {
- var i int
- i, err = strconv.Atoi(string(b))
- if err == nil {
- // kill the slirp process so we do not leak it
- err = syscall.Kill(i, syscall.SIGTERM)
- }
- }
- if err != nil {
- logrus.Errorf("Failed to kill slirp4netns process: %s", err)
- }
- err = os.RemoveAll(r.dir)
- if err != nil {
- logrus.Error(err)
- }
- } else if err != nil && !os.IsNotExist(err) {
- logrus.Errorf("Could not read rootless cni directory, skipping cleanup: %s", err)
+ // no cleanup if we found containers
+ if len(ctrs) > 0 {
+ return nil
+ }
+ logrus.Debug("Cleaning up rootless network namespace")
+ err = netns.UnmountNS(r.ns)
+ if err != nil {
+ return err
+ }
+ // make the following errors not fatal
+ err = r.ns.Close()
+ if err != nil {
+ logrus.Error(err)
+ }
+ b, err := ioutil.ReadFile(r.getPath(rootlessNetNsSilrp4netnsPidFile))
+ if err == nil {
+ var i int
+ i, err = strconv.Atoi(string(b))
+ if err == nil {
+ // kill the slirp process so we do not leak it
+ err = syscall.Kill(i, syscall.SIGTERM)
}
}
+ if err != nil {
+ logrus.Errorf("Failed to kill slirp4netns process: %s", err)
+ }
+ err = os.RemoveAll(r.dir)
+ if err != nil {
+ logrus.Error(err)
+ }
return nil
}
-// GetRootlessCNINetNs returns the rootless cni object. If create is set to true
-// the rootless cni namespace will be created if it does not exists already.
+// GetRootlessNetNs returns the rootless netns object. If create is set to true
+// the rootless network namespace will be created if it does not exists already.
// If called as root it returns always nil.
// On success the returned RootlessCNI lock is locked and must be unlocked by the caller.
-func (r *Runtime) GetRootlessCNINetNs(new bool) (*RootlessCNI, error) {
+func (r *Runtime) GetRootlessNetNs(new bool) (*RootlessNetNS, error) {
if !rootless.IsRootless() {
return nil, nil
}
- var rootlessCNINS *RootlessCNI
+ var rootlessNetNS *RootlessNetNS
runDir, err := util.GetRuntimeDir()
if err != nil {
return nil, err
}
- lfile := filepath.Join(runDir, "rootless-cni.lock")
+ lfile := filepath.Join(runDir, "rootless-netns.lock")
lock, err := lockfile.GetLockfile(lfile)
if err != nil {
- return nil, errors.Wrap(err, "failed to get rootless-cni lockfile")
+ return nil, errors.Wrap(err, "failed to get rootless-netns lockfile")
}
lock.Lock()
defer func() {
- // In case of an error (early exit) rootlessCNINS will be nil.
+ // In case of an error (early exit) rootlessNetNS will be nil.
// Make sure to unlock otherwise we could deadlock.
- if rootlessCNINS == nil {
+ if rootlessNetNS == nil {
lock.Unlock()
}
}()
- cniDir := filepath.Join(runDir, "rootless-cni")
- err = os.MkdirAll(cniDir, 0700)
+ rootlessNetNsDir := filepath.Join(runDir, rootlessNetNsName)
+ err = os.MkdirAll(rootlessNetNsDir, 0700)
if err != nil {
- return nil, errors.Wrap(err, "could not create rootless-cni directory")
+ return nil, errors.Wrap(err, "could not create rootless-netns directory")
}
nsDir, err := netns.GetNSRunDir()
if err != nil {
return nil, err
}
- path := filepath.Join(nsDir, rootlessCNINSName)
+ path := filepath.Join(nsDir, rootlessNetNsName)
ns, err := ns.GetNS(path)
if err != nil {
if !new {
// return a error if we could not get the namespace and should no create one
- return nil, errors.Wrap(err, "error getting rootless cni network namespace")
+ return nil, errors.Wrap(err, "error getting rootless network namespace")
}
// create a new namespace
- logrus.Debug("creating rootless cni network namespace")
- ns, err = netns.NewNSWithName(rootlessCNINSName)
+ logrus.Debug("creating rootless network namespace")
+ ns, err = netns.NewNSWithName(rootlessNetNsName)
if err != nil {
- return nil, errors.Wrap(err, "error creating rootless cni network namespace")
+ return nil, errors.Wrap(err, "error creating rootless network namespace")
}
// setup slirp4netns here
path := r.config.Engine.NetworkCmdPath
@@ -479,7 +476,7 @@ func (r *Runtime) GetRootlessCNINetNs(new bool) (*RootlessCNI, error) {
// Leak one end of the pipe in slirp4netns
cmd.ExtraFiles = append(cmd.ExtraFiles, syncW)
- logPath := filepath.Join(r.config.Engine.TmpDir, "slirp4netns-rootless-cni.log")
+ logPath := filepath.Join(r.config.Engine.TmpDir, "slirp4netns-rootless-netns.log")
logFile, err := os.Create(logPath)
if err != nil {
return nil, errors.Wrapf(err, "failed to open slirp4netns log file %s", logPath)
@@ -498,9 +495,9 @@ func (r *Runtime) GetRootlessCNINetNs(new bool) (*RootlessCNI, error) {
// create pid file for the slirp4netns process
// this is need to kill the process in the cleanup
pid := strconv.Itoa(cmd.Process.Pid)
- err = ioutil.WriteFile(filepath.Join(cniDir, "rootless-cni-slirp4netns.pid"), []byte(pid), 0700)
+ err = ioutil.WriteFile(filepath.Join(rootlessNetNsDir, rootlessNetNsSilrp4netnsPidFile), []byte(pid), 0700)
if err != nil {
- errors.Wrap(err, "unable to write rootless-cni slirp4netns pid file")
+ errors.Wrap(err, "unable to write rootless-netns slirp4netns pid file")
}
defer func() {
@@ -541,43 +538,43 @@ func (r *Runtime) GetRootlessCNINetNs(new bool) (*RootlessCNI, error) {
dnsOptions := resolvconf.GetOptions(conf.Content)
nameServers := resolvconf.GetNameservers(conf.Content)
- _, err = resolvconf.Build(filepath.Join(cniDir, "resolv.conf"), append([]string{resolveIP.String()}, nameServers...), searchDomains, dnsOptions)
+ _, err = resolvconf.Build(filepath.Join(rootlessNetNsDir, "resolv.conf"), append([]string{resolveIP.String()}, nameServers...), searchDomains, dnsOptions)
if err != nil {
- return nil, errors.Wrap(err, "failed to create rootless cni resolv.conf")
+ return nil, errors.Wrap(err, "failed to create rootless netns resolv.conf")
}
// create cni directories to store files
// they will be bind mounted to the correct location in a extra mount ns
- err = os.MkdirAll(filepath.Join(cniDir, strings.TrimPrefix(persistentCNIDir, "/")), 0700)
+ err = os.MkdirAll(filepath.Join(rootlessNetNsDir, persistentCNIDir), 0700)
if err != nil {
- return nil, errors.Wrap(err, "could not create rootless-cni var directory")
+ return nil, errors.Wrap(err, "could not create rootless-netns var directory")
}
- runDir := filepath.Join(cniDir, "run")
+ runDir := filepath.Join(rootlessNetNsDir, "run")
err = os.MkdirAll(runDir, 0700)
if err != nil {
- return nil, errors.Wrap(err, "could not create rootless-cni run directory")
+ return nil, errors.Wrap(err, "could not create rootless-netns run directory")
}
// relabel the new run directory to the iptables /run label
// this is important, otherwise the iptables command will fail
err = label.Relabel(runDir, "system_u:object_r:iptables_var_run_t:s0", false)
if err != nil {
- return nil, errors.Wrap(err, "could not create relabel rootless-cni run directory")
+ return nil, errors.Wrap(err, "could not create relabel rootless-netns run directory")
}
// create systemd run directory
err = os.MkdirAll(filepath.Join(runDir, "systemd"), 0700)
if err != nil {
- return nil, errors.Wrap(err, "could not create rootless-cni systemd directory")
+ return nil, errors.Wrap(err, "could not create rootless-netns systemd directory")
}
// create the directory for the netns files at the same location
- // relative to the rootless-cni location
- err = os.MkdirAll(filepath.Join(cniDir, nsDir), 0700)
+ // relative to the rootless-netns location
+ err = os.MkdirAll(filepath.Join(rootlessNetNsDir, nsDir), 0700)
if err != nil {
- return nil, errors.Wrap(err, "could not create rootless-cni netns directory")
+ return nil, errors.Wrap(err, "could not create rootless-netns netns directory")
}
}
- // The CNI plugins need access to iptables in $PATH. As it turns out debian doesn't put
- // /usr/sbin in $PATH for rootless users. This will break rootless cni completely.
+ // The CNI plugins and netavark need access to iptables in $PATH. As it turns out debian doesn't put
+ // /usr/sbin in $PATH for rootless users. This will break rootless networking completely.
// We might break existing users and we cannot expect everyone to change their $PATH so
// lets add /usr/sbin to $PATH ourselves.
path = os.Getenv("PATH")
@@ -586,14 +583,14 @@ func (r *Runtime) GetRootlessCNINetNs(new bool) (*RootlessCNI, error) {
os.Setenv("PATH", path)
}
- // Important set rootlessCNINS as last step.
+ // Important set rootlessNetNS as last step.
// Do not return any errors after this.
- rootlessCNINS = &RootlessCNI{
+ rootlessNetNS = &RootlessNetNS{
ns: ns,
- dir: cniDir,
+ dir: rootlessNetNsDir,
Lock: lock,
}
- return rootlessCNINS, nil
+ return rootlessNetNS, nil
}
// setPrimaryMachineIP is used for podman-machine and it sets
@@ -615,14 +612,14 @@ func setPrimaryMachineIP() error {
}
// setUpNetwork will set up the the networks, on error it will also tear down the cni
-// networks. If rootless it will join/create the rootless cni namespace.
+// networks. If rootless it will join/create the rootless network namespace.
func (r *Runtime) setUpNetwork(ns string, opts types.NetworkOptions) (map[string]types.StatusBlock, error) {
if r.config.MachineEnabled() {
if err := setPrimaryMachineIP(); err != nil {
return nil, err
}
}
- rootlessCNINS, err := r.GetRootlessCNINetNs(true)
+ rootlessNetNS, err := r.GetRootlessNetNs(true)
if err != nil {
return nil, err
}
@@ -631,11 +628,11 @@ func (r *Runtime) setUpNetwork(ns string, opts types.NetworkOptions) (map[string
results, err = r.network.Setup(ns, types.SetupOptions{NetworkOptions: opts})
return err
}
- // rootlessCNINS is nil if we are root
- if rootlessCNINS != nil {
- // execute the cni setup in the rootless net ns
- err = rootlessCNINS.Do(setUpPod)
- rootlessCNINS.Lock.Unlock()
+ // rootlessNetNS is nil if we are root
+ if rootlessNetNS != nil {
+ // execute the setup in the rootless net ns
+ err = rootlessNetNS.Do(setUpPod)
+ rootlessNetNS.Lock.Unlock()
} else {
err = setUpPod()
}
@@ -709,10 +706,10 @@ func (r *Runtime) setupRootlessNetNS(ctr *Container) error {
return err
}
if len(networks) > 0 && len(ctr.config.PortMappings) > 0 {
- // set up port forwarder for CNI-in-slirp4netns
+ // set up port forwarder for rootless netns
netnsPath := ctr.state.NetNS.Path()
// TODO: support slirp4netns port forwarder as well
- // make sure to fix this container.handleRestartPolicy() as well
+ // make sure to fix this in container.handleRestartPolicy() as well
return r.setupRootlessPortMappingViaRLK(ctr, netnsPath)
}
return nil
@@ -731,7 +728,7 @@ func (r *Runtime) setupNetNS(ctr *Container) error {
if err != nil {
return err
}
- nsPath = filepath.Join(nsPath, fmt.Sprintf("cni-%x-%x-%x-%x-%x", b[0:4], b[4:6], b[6:8], b[8:10], b[10:]))
+ nsPath = filepath.Join(nsPath, fmt.Sprintf("netns-%x-%x-%x-%x-%x", b[0:4], b[4:6], b[6:8], b[8:10], b[10:]))
if err := os.MkdirAll(filepath.Dir(nsPath), 0711); err != nil {
return err
@@ -789,10 +786,10 @@ func (r *Runtime) closeNetNS(ctr *Container) error {
return nil
}
-// Tear down a container's CNI network configuration and joins the
+// Tear down a container's network configuration and joins the
// rootless net ns as rootless user
func (r *Runtime) teardownNetwork(ns string, opts types.NetworkOptions) error {
- rootlessCNINS, err := r.GetRootlessCNINetNs(false)
+ rootlessNetNS, err := r.GetRootlessNetNs(false)
if err != nil {
return err
}
@@ -801,13 +798,13 @@ func (r *Runtime) teardownNetwork(ns string, opts types.NetworkOptions) error {
return errors.Wrapf(err, "error tearing down network namespace configuration for container %s", opts.ContainerID)
}
- // rootlessCNINS is nil if we are root
- if rootlessCNINS != nil {
+ // rootlessNetNS is nil if we are root
+ if rootlessNetNS != nil {
// execute the cni setup in the rootless net ns
- err = rootlessCNINS.Do(tearDownPod)
- rootlessCNINS.Lock.Unlock()
+ err = rootlessNetNS.Do(tearDownPod)
+ rootlessNetNS.Lock.Unlock()
if err == nil {
- err = rootlessCNINS.Cleanup(r)
+ err = rootlessNetNS.Cleanup(r)
}
} else {
err = tearDownPod()
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-20 06:03:53 +0000