github.com/rawahars/moby@v24.0.4+incompatible/libnetwork/drivers/overlay/ov_utils.go (about)

     1  //go:build linux
     2  // +build linux
     3  
     4  package overlay
     5  
     6  import (
     7  	"fmt"
     8  	"syscall"
     9  
    10  	"github.com/docker/docker/libnetwork/drivers/overlay/overlayutils"
    11  	"github.com/docker/docker/libnetwork/netutils"
    12  	"github.com/docker/docker/libnetwork/ns"
    13  	"github.com/sirupsen/logrus"
    14  	"github.com/vishvananda/netlink"
    15  	"github.com/vishvananda/netns"
    16  )
    17  
    18  var soTimeout = ns.NetlinkSocketsTimeout
    19  
    20  func validateID(nid, eid string) error {
    21  	if nid == "" {
    22  		return fmt.Errorf("invalid network id")
    23  	}
    24  
    25  	if eid == "" {
    26  		return fmt.Errorf("invalid endpoint id")
    27  	}
    28  
    29  	return nil
    30  }
    31  
    32  func createVethPair() (string, string, error) {
    33  	nlh := ns.NlHandle()
    34  
    35  	// Generate a name for what will be the host side pipe interface
    36  	name1, err := netutils.GenerateIfaceName(nlh, vethPrefix, vethLen)
    37  	if err != nil {
    38  		return "", "", fmt.Errorf("error generating veth name1: %v", err)
    39  	}
    40  
    41  	// Generate a name for what will be the sandbox side pipe interface
    42  	name2, err := netutils.GenerateIfaceName(nlh, vethPrefix, vethLen)
    43  	if err != nil {
    44  		return "", "", fmt.Errorf("error generating veth name2: %v", err)
    45  	}
    46  
    47  	// Generate and add the interface pipe host <-> sandbox
    48  	veth := &netlink.Veth{
    49  		LinkAttrs: netlink.LinkAttrs{Name: name1, TxQLen: 0},
    50  		PeerName:  name2}
    51  	if err := nlh.LinkAdd(veth); err != nil {
    52  		return "", "", fmt.Errorf("error creating veth pair: %v", err)
    53  	}
    54  
    55  	return name1, name2, nil
    56  }
    57  
    58  func createVxlan(name string, vni uint32, mtu int) error {
    59  	vxlan := &netlink.Vxlan{
    60  		LinkAttrs: netlink.LinkAttrs{Name: name, MTU: mtu},
    61  		VxlanId:   int(vni),
    62  		Learning:  true,
    63  		Port:      int(overlayutils.VXLANUDPPort()),
    64  		Proxy:     true,
    65  		L3miss:    true,
    66  		L2miss:    true,
    67  	}
    68  
    69  	if err := ns.NlHandle().LinkAdd(vxlan); err != nil {
    70  		return fmt.Errorf("error creating vxlan interface: %v", err)
    71  	}
    72  
    73  	return nil
    74  }
    75  
    76  func deleteInterface(name string) error {
    77  	link, err := ns.NlHandle().LinkByName(name)
    78  	if err != nil {
    79  		return fmt.Errorf("failed to find interface with name %s: %v", name, err)
    80  	}
    81  
    82  	if err := ns.NlHandle().LinkDel(link); err != nil {
    83  		return fmt.Errorf("error deleting interface with name %s: %v", name, err)
    84  	}
    85  
    86  	return nil
    87  }
    88  
    89  func deleteVxlanByVNI(path string, vni uint32) error {
    90  	nlh := ns.NlHandle()
    91  	if path != "" {
    92  		ns, err := netns.GetFromPath(path)
    93  		if err != nil {
    94  			return fmt.Errorf("failed to get ns handle for %s: %v", path, err)
    95  		}
    96  		defer ns.Close()
    97  
    98  		nlh, err = netlink.NewHandleAt(ns, syscall.NETLINK_ROUTE)
    99  		if err != nil {
   100  			return fmt.Errorf("failed to get netlink handle for ns %s: %v", path, err)
   101  		}
   102  		defer nlh.Close()
   103  		err = nlh.SetSocketTimeout(soTimeout)
   104  		if err != nil {
   105  			logrus.Warnf("Failed to set the timeout on the netlink handle sockets for vxlan deletion: %v", err)
   106  		}
   107  	}
   108  
   109  	links, err := nlh.LinkList()
   110  	if err != nil {
   111  		return fmt.Errorf("failed to list interfaces while deleting vxlan interface by vni: %v", err)
   112  	}
   113  
   114  	for _, l := range links {
   115  		if l.Type() == "vxlan" && (vni == 0 || l.(*netlink.Vxlan).VxlanId == int(vni)) {
   116  			err = nlh.LinkDel(l)
   117  			if err != nil {
   118  				return fmt.Errorf("error deleting vxlan interface with id %d: %v", vni, err)
   119  			}
   120  			return nil
   121  		}
   122  	}
   123  
   124  	return fmt.Errorf("could not find a vxlan interface to delete with id %d", vni)
   125  }