Method SetInterface

pkg/sentry/socket/netstack/stack.go:175–242

SetInterface implements inet.Stack.SetInterface.

(ctx context.Context, msg *nlmsg.Message)

// SetInterface implements inet.Stack.SetInterface.
func (s *Stack) SetInterface(ctx context.Context, msg *nlmsg.Message) *syserr.Error {
	var ifinfomsg linux.InterfaceInfoMessage
	attrsView, ok := msg.GetData(&ifinfomsg)
	if !ok {
		return syserr.ErrInvalidArgument
	}
	attrs, ok := attrsView.Parse()
	if !ok {
		return syserr.ErrInvalidArgument
	}
	ifname := ""
	for attr := range attrs {
		value := attrs[attr]
		switch attr {
		case linux.IFLA_IFNAME:
			if len(value) < 1 {
				return syserr.ErrInvalidArgument
			}
			if ifinfomsg.Index == 0 {
				ifname = value.String()
				for idx, ifa := range s.Interfaces() {
					if ifname == ifa.Name {
						ifinfomsg.Index = idx
						break
					}
				}
			}
		case linux.IFLA_MASTER:
		case linux.IFLA_LINKINFO:
		case linux.IFLA_ADDRESS:
		case linux.IFLA_MTU:
		case linux.IFLA_NET_NS_FD:
		case linux.IFLA_TXQLEN:
		default:
			ctx.Warningf("unexpected attribute: %x", attr)
			return syserr.ErrNotSupported
		}
	}
	flags := msg.Header().Flags
	if ifinfomsg.Index == 0 {
		if flags&linux.NLM_F_CREATE != 0 {
			return s.newInterface(ctx, msg, attrs)
		}
		return syserr.ErrNoDevice
	}

	if flags&(linux.NLM_F_EXCL|linux.NLM_F_REPLACE) != 0 {
		return syserr.ErrExists
	}
	if ifinfomsg.Flags != 0 || ifinfomsg.Change != 0 {
		if ifinfomsg.Change & ^uint32(linux.IFF_UP) != 0 {
			ctx.Warningf("Unsupported ifi_change flags: %x", ifinfomsg.Change)
			return syserr.ErrInvalidArgument
		}
		if ifinfomsg.Flags & ^uint32(linux.IFF_UP) != 0 {
			ctx.Warningf("Unsupported ifi_flags: %x", ifinfomsg.Flags)
			return syserr.ErrInvalidArgument
		}