network.go

Documentation: github.com/Microsoft/hcsshim/internal/vm/remotevm

     1  //go:build windows
     2  
     3  package remotevm
     4  
     5  import (
     6  	"context"
     7  	"encoding/json"
     8  	"fmt"
     9  	"strings"
    10  
    11  	"github.com/Microsoft/go-winio/pkg/guid"
    12  	"github.com/Microsoft/hcsshim/hcn"
    13  	"github.com/Microsoft/hcsshim/internal/vmservice"
    14  	"github.com/pkg/errors"
    15  )
    16  
    17  func getSwitchID(endpointID, portID string) (string, error) {
    18  	// Get updated endpoint with new fields (need switch ID)
    19  	ep, err := hcn.GetEndpointByID(endpointID)
    20  	if err != nil {
    21  		return "", errors.Wrapf(err, "failed to get endpoint %q", endpointID)
    22  	}
    23  
    24  	type ExtraInfo struct {
    25  		Allocators []struct {
    26  			SwitchID         string `json:"SwitchId"`
    27  			EndpointPortGUID string `json:"EndpointPortGuid"`
    28  		}
    29  	}
    30  
    31  	var exi ExtraInfo
    32  	if err := json.Unmarshal(ep.Health.Extra.Resources, &exi); err != nil {
    33  		return "", errors.Wrapf(err, "failed to unmarshal resource data from endpoint %q", endpointID)
    34  	}
    35  
    36  	if len(exi.Allocators) == 0 {
    37  		return "", errors.New("no resource data found for endpoint")
    38  	}
    39  
    40  	// NIC should only ever belong to one switch but there are cases where there's more than one allocator
    41  	// in the returned data. It seems they only ever contain empty strings so search for the first entry
    42  	// that actually contains a switch ID and that has the matching port GUID we made earlier.
    43  	var switchID string
    44  	for _, allocator := range exi.Allocators {
    45  		if allocator.SwitchID != "" && strings.ToLower(allocator.EndpointPortGUID) == portID {
    46  			switchID = allocator.SwitchID
    47  			break
    48  		}
    49  	}
    50  	return switchID, nil
    51  }
    52  
    53  func (uvm *utilityVM) AddNIC(ctx context.Context, nicID, endpointID, macAddr string) error {
    54  	portID, err := guid.NewV4()
    55  	if err != nil {
    56  		return errors.Wrap(err, "failed to generate guid for port")
    57  	}
    58  
    59  	vmEndpointRequest := hcn.VmEndpointRequest{
    60  		PortId:           portID,
    61  		VirtualNicName:   fmt.Sprintf("%s--%s", nicID, portID),
    62  		VirtualMachineId: guid.GUID{},
    63  	}
    64  
    65  	m, err := json.Marshal(vmEndpointRequest)
    66  	if err != nil {
    67  		return errors.Wrap(err, "failed to marshal endpoint request json")
    68  	}
    69  
    70  	if err := hcn.ModifyEndpointSettings(endpointID, &hcn.ModifyEndpointSettingRequest{
    71  		ResourceType: hcn.EndpointResourceTypePort,
    72  		RequestType:  hcn.RequestTypeAdd,
    73  		Settings:     json.RawMessage(m),
    74  	}); err != nil {
    75  		return errors.Wrap(err, "failed to configure switch port")
    76  	}
    77  
    78  	switchID, err := getSwitchID(endpointID, portID.String())
    79  	if err != nil {
    80  		return err
    81  	}
    82  
    83  	nic := &vmservice.NICConfig{
    84  		NicID:      nicID,
    85  		MacAddress: macAddr,
    86  		PortID:     portID.String(),
    87  		SwitchID:   switchID,
    88  	}
    89  
    90  	if _, err := uvm.client.ModifyResource(ctx,
    91  		&vmservice.ModifyResourceRequest{
    92  			Type: vmservice.ModifyType_ADD,
    93  			Resource: &vmservice.ModifyResourceRequest_NicConfig{
    94  				NicConfig: nic,
    95  			},
    96  		},
    97  	); err != nil {
    98  		return errors.Wrap(err, "failed to add network adapter")
    99  	}
   100  
   101  	return nil
   102  }
   103  
   104  func (uvm *utilityVM) RemoveNIC(ctx context.Context, nicID, endpointID, macAddr string) error {
   105  	nic := &vmservice.NICConfig{
   106  		NicID:      nicID,
   107  		MacAddress: macAddr,
   108  	}
   109  
   110  	if _, err := uvm.client.ModifyResource(ctx,
   111  		&vmservice.ModifyResourceRequest{
   112  			Type: vmservice.ModifyType_REMOVE,
   113  			Resource: &vmservice.ModifyResourceRequest_NicConfig{
   114  				NicConfig: nic,
   115  			},
   116  		},
   117  	); err != nil {
   118  		return errors.Wrap(err, "failed to remove network adapter")
   119  	}
   120  
   121  	return nil
   122  }
   123
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