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This PR adds a plugin to create tap devices. The tap device creation might differ between distros, so the plugin allows to specify a distro parameter for customized handling of tap device creation for a specific distro Signed-off-by: mmirecki <mmirecki@redhat.com>
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mmirecki
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Jan 13, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| package distro | ||
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| type Distro interface { | ||
| CreateLink(tmpName string, mtu int, nsFd int, nsPath string, multiqueue bool, mac string, owner int, group int) error | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| package rhel | ||
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| import ( | ||
| "fmt" | ||
| "github.com/containernetworking/plugins/plugins/main/tap/distro" | ||
| "github.com/opencontainers/selinux/go-selinux" | ||
| "os/exec" | ||
| "strconv" | ||
| "strings" | ||
| "syscall" | ||
| ) | ||
|
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| var Rhel distro.Distro = CreateLink{} | ||
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| type CreateLink struct{} | ||
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| func (l CreateLink) CreateLink(tmpName string, mtu int, nsFd int, nsPath string, multique bool, mac string, owner int, group int) error { | ||
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| err := setContainerSeBool() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = createSelinuxTap(tmpName, mtu, nsFd, nsPath, multique, mac, owner, group) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
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| func setContainerSeBool() error { | ||
| output, err := exec.Command("cat", "/sys/fs/selinux/booleans/container_use_devices").CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to run getsebool command %s: %v", string(output), err) | ||
| } | ||
| if strings.Contains(string(output), "off") { | ||
| output, err := exec.Command("setsebool", "-P", "container_use_devices", "true").CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to run setsebool command %s: %v", string(output), err) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| // Due to issues with the vishvananda/netlink library (fix pending) this method is using the ip tool to set up | ||
| // the tap device. | ||
| func createSelinuxTap(tmpName string, mtu int, nsFd int, nsPath string, multiqueue bool, mac string, owner int, group int) error { | ||
| if err := selinux.SetExecLabel("system_u:system_r:container_t:s0"); err != nil { | ||
| return fmt.Errorf("failed set socket label: %v", err) | ||
| } | ||
|
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| minFDToCloseOnExec := 3 | ||
| maxFDToCloseOnExec := 256 | ||
| // we want to share the parent process std{in|out|err} - fds 0 through 2. | ||
| // Since the FDs are inherited on fork / exec, we close on exec all others. | ||
| for fd := minFDToCloseOnExec; fd < maxFDToCloseOnExec; fd++ { | ||
| syscall.CloseOnExec(fd) | ||
| } | ||
|
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| tapDeviceArgs := []string{"tuntap", "add", "mode", "tap", "name", tmpName} | ||
| if multiqueue { | ||
| tapDeviceArgs = append(tapDeviceArgs, "multi_queue") | ||
| } | ||
|
|
||
| if owner >= 0 { | ||
| tapDeviceArgs = append(tapDeviceArgs, "user", strconv.Itoa(owner)) | ||
| } | ||
| if group >= 0 { | ||
| tapDeviceArgs = append(tapDeviceArgs, "group", strconv.Itoa(group)) | ||
| } | ||
| output, err := exec.Command("ip", tapDeviceArgs...).CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to run command %s: %v", output, err) | ||
| } | ||
|
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| tapDeviceArgs = []string{"link", "set", tmpName} | ||
| if mtu != 0 { | ||
| tapDeviceArgs = append(tapDeviceArgs, "mtu", strconv.Itoa(mtu)) | ||
| } | ||
| if mac != "" { | ||
| tapDeviceArgs = append(tapDeviceArgs, "address", mac) | ||
| } | ||
| output, err = exec.Command("ip", tapDeviceArgs...).CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to run command %s: %v", output, err) | ||
| } | ||
| return nil | ||
| } |
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