Golang nl.ZeroTerminated函数代码示例

func encodeActions(attr *nl.RtAttr, actions []Action) error {
	tabIndex := int(nl.TCA_ACT_TAB)

	for _, action := range actions {
		switch action := action.(type) {
		default:
			return fmt.Errorf("unknown action type %s", action.Type())
		case *MirredAction:
			table := nl.NewRtAttrChild(attr, tabIndex, nil)
			tabIndex++
			nl.NewRtAttrChild(table, nl.TCA_ACT_KIND, nl.ZeroTerminated("mirred"))
			aopts := nl.NewRtAttrChild(table, nl.TCA_ACT_OPTIONS, nil)
			nl.NewRtAttrChild(aopts, nl.TCA_MIRRED_PARMS, action.Serialize())
		case *BpfAction:
			table := nl.NewRtAttrChild(attr, tabIndex, nil)
			tabIndex++
			nl.NewRtAttrChild(table, nl.TCA_ACT_KIND, nl.ZeroTerminated("bpf"))
			aopts := nl.NewRtAttrChild(table, nl.TCA_ACT_OPTIONS, nil)
			nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_PARMS, action.Serialize())
			nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_FD, nl.Uint32Attr(uint32(action.Fd)))
			nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_NAME, nl.ZeroTerminated(action.Name))
		}
	}
	return nil
}

func fillService(s *Service) nl.NetlinkRequestData {
	cmdAttr := nl.NewRtAttr(ipvsCmdAttrService, nil)
	nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrAddressFamily, nl.Uint16Attr(s.AddressFamily))
	if s.FWMark != 0 {
		nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrFWMark, nl.Uint32Attr(s.FWMark))
	} else {
		nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrProtocol, nl.Uint16Attr(s.Protocol))
		nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrAddress, rawIPData(s.Address))

		// Port needs to be in network byte order.
		portBuf := new(bytes.Buffer)
		binary.Write(portBuf, binary.BigEndian, s.Port)
		nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrPort, portBuf.Bytes())
	}

	nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrSchedName, nl.ZeroTerminated(s.SchedName))
	if s.PEName != "" {
		nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrPEName, nl.ZeroTerminated(s.PEName))
	}

	f := &ipvsFlags{
		flags: s.Flags,
		mask:  0xFFFFFFFF,
	}
	nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrFlags, f.Serialize())
	nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrTimeout, nl.Uint32Attr(s.Timeout))
	nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrNetmask, nl.Uint32Attr(s.Netmask))
	return cmdAttr
}

func getIPVSFamily() (int, error) {
	sock, err := nl.GetNetlinkSocketAt(netns.None(), netns.None(), syscall.NETLINK_GENERIC)
	if err != nil {
		return 0, err
	}

	req := newGenlRequest(genlCtrlID, genlCtrlCmdGetFamily)
	req.AddData(nl.NewRtAttr(genlCtrlAttrFamilyName, nl.ZeroTerminated("IPVS")))

	msgs, err := execute(sock, req, 0)
	if err != nil {
		return 0, err
	}

	for _, m := range msgs {
		hdr := deserializeGenlMsg(m)
		attrs, err := nl.ParseRouteAttr(m[hdr.Len():])
		if err != nil {
			return 0, err
		}

		for _, attr := range attrs {
			switch int(attr.Attr.Type) {
			case genlCtrlAttrFamilyID:
				return int(native.Uint16(attr.Value[0:2])), nil
			}
		}
	}

	return 0, fmt.Errorf("no family id in the netlink response")
}

// ensureBridgeTxQueueLen() ensures that the bridge interface's TX queue
// length is greater than zero.  Due to a CNI <= 0.3.0 'bridge' plugin bug,
// the bridge is initially created with a TX queue length of 0, which gets
// used as the packet limit for FIFO traffic shapers, which drops packets.
// TODO: remove when we can depend on a fixed CNI
func (plugin *kubenetNetworkPlugin) ensureBridgeTxQueueLen() {
	bridge, err := netlink.LinkByName(BridgeName)
	if err != nil {
		return
	}

	if bridge.Attrs().TxQLen > 0 {
		return
	}

	req := nl.NewNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_ACK)
	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	req.AddData(msg)

	nameData := nl.NewRtAttr(syscall.IFLA_IFNAME, nl.ZeroTerminated(BridgeName))
	req.AddData(nameData)

	qlen := nl.NewRtAttr(syscall.IFLA_TXQLEN, nl.Uint32Attr(1000))
	req.AddData(qlen)

	_, err = req.Execute(syscall.NETLINK_ROUTE, 0)
	if err != nil {
		glog.V(5).Infof("Failed to set bridge tx queue length: %v", err)
	}
}

// ClassAdd will add a class to the system.
// Equivalent to: `tc class add $class`
func ClassAdd(class Class) error {
	req := nl.NewNetlinkRequest(syscall.RTM_NEWTCLASS, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
	base := class.Attrs()
	msg := &nl.TcMsg{
		Family:  nl.FAMILY_ALL,
		Ifindex: int32(base.LinkIndex),
		Handle:  base.Handle,
		Parent:  base.Parent,
	}
	req.AddData(msg)
	req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(class.Type())))

	options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
	if htb, ok := class.(*HtbClass); ok {
		opt := nl.TcHtbCopt{}
		opt.Rate.Rate = uint32(htb.Rate)
		opt.Ceil.Rate = uint32(htb.Ceil)
		opt.Buffer = htb.Buffer
		opt.Cbuffer = htb.Cbuffer
		opt.Quantum = htb.Quantum
		opt.Level = htb.Level
		opt.Prio = htb.Prio
		// TODO: Handle Debug properly. For now default to 0
		nl.NewRtAttrChild(options, nl.TCA_HTB_PARMS, opt.Serialize())
	}
	req.AddData(options)
	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}

func (h *Handle) addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error {
	base := link.Attrs()
	if addr.Label != "" && !strings.HasPrefix(addr.Label, base.Name) {
		return fmt.Errorf("label must begin with interface name")
	}
	h.ensureIndex(base)

	family := nl.GetIPFamily(addr.IP)

	msg := nl.NewIfAddrmsg(family)
	msg.Index = uint32(base.Index)
	msg.Scope = uint8(addr.Scope)
	prefixlen, _ := addr.Mask.Size()
	msg.Prefixlen = uint8(prefixlen)
	req.AddData(msg)

	var localAddrData []byte
	if family == FAMILY_V4 {
		localAddrData = addr.IP.To4()
	} else {
		localAddrData = addr.IP.To16()
	}

	localData := nl.NewRtAttr(syscall.IFA_LOCAL, localAddrData)
	req.AddData(localData)
	var peerAddrData []byte
	if addr.Peer != nil {
		if family == FAMILY_V4 {
			peerAddrData = addr.Peer.IP.To4()
		} else {
			peerAddrData = addr.Peer.IP.To16()
		}
	} else {
		peerAddrData = localAddrData
	}

	addressData := nl.NewRtAttr(syscall.IFA_ADDRESS, peerAddrData)
	req.AddData(addressData)

	if addr.Flags != 0 {
		if addr.Flags <= 0xff {
			msg.IfAddrmsg.Flags = uint8(addr.Flags)
		} else {
			b := make([]byte, 4)
			native.PutUint32(b, uint32(addr.Flags))
			flagsData := nl.NewRtAttr(IFA_FLAGS, b)
			req.AddData(flagsData)
		}
	}

	if addr.Label != "" {
		labelData := nl.NewRtAttr(syscall.IFA_LABEL, nl.ZeroTerminated(addr.Label))
		req.AddData(labelData)
	}

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}

func encodeActions(attr *nl.RtAttr, actions []Action) error {
	tabIndex := int(nl.TCA_ACT_TAB)

	for _, action := range actions {
		switch action := action.(type) {
		default:
			return fmt.Errorf("unknown action type %s", action.Type())
		case *MirredAction:
			table := nl.NewRtAttrChild(attr, tabIndex, nil)
			tabIndex++
			nl.NewRtAttrChild(table, nl.TCA_ACT_KIND, nl.ZeroTerminated("mirred"))
			aopts := nl.NewRtAttrChild(table, nl.TCA_ACT_OPTIONS, nil)
			mirred := nl.TcMirred{
				Eaction: int32(action.MirredAction),
				Ifindex: uint32(action.Ifindex),
			}
			toTcGen(action.Attrs(), &mirred.TcGen)
			nl.NewRtAttrChild(aopts, nl.TCA_MIRRED_PARMS, mirred.Serialize())
		case *BpfAction:
			table := nl.NewRtAttrChild(attr, tabIndex, nil)
			tabIndex++
			nl.NewRtAttrChild(table, nl.TCA_ACT_KIND, nl.ZeroTerminated("bpf"))
			aopts := nl.NewRtAttrChild(table, nl.TCA_ACT_OPTIONS, nil)
			gen := nl.TcGen{}
			toTcGen(action.Attrs(), &gen)
			nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_PARMS, gen.Serialize())
			nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_FD, nl.Uint32Attr(uint32(action.Fd)))
			nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_NAME, nl.ZeroTerminated(action.Name))
		case *GenericAction:
			table := nl.NewRtAttrChild(attr, tabIndex, nil)
			tabIndex++
			nl.NewRtAttrChild(table, nl.TCA_ACT_KIND, nl.ZeroTerminated("gact"))
			aopts := nl.NewRtAttrChild(table, nl.TCA_ACT_OPTIONS, nil)
			gen := nl.TcGen{}
			toTcGen(action.Attrs(), &gen)
			nl.NewRtAttrChild(aopts, nl.TCA_GACT_PARMS, gen.Serialize())
		}
	}
	return nil
}

// FilterAdd will add a filter to the system.
// Equivalent to: `tc filter add $filter`
func FilterAdd(filter Filter) error {
	req := nl.NewNetlinkRequest(syscall.RTM_NEWTFILTER, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
	base := filter.Attrs()
	msg := &nl.TcMsg{
		Family:  nl.FAMILY_ALL,
		Ifindex: int32(base.LinkIndex),
		Handle:  base.Handle,
		Parent:  base.Parent,
		Info:    MakeHandle(base.Priority, nl.Swap16(base.Protocol)),
	}
	req.AddData(msg)
	req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(filter.Type())))

	options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
	if u32, ok := filter.(*U32); ok {
		// match all
		sel := nl.TcU32Sel{
			Nkeys: 1,
			Flags: nl.TC_U32_TERMINAL,
		}
		sel.Keys = append(sel.Keys, nl.TcU32Key{})
		nl.NewRtAttrChild(options, nl.TCA_U32_SEL, sel.Serialize())
		actions := nl.NewRtAttrChild(options, nl.TCA_U32_ACT, nil)
		table := nl.NewRtAttrChild(actions, nl.TCA_ACT_TAB, nil)
		nl.NewRtAttrChild(table, nl.TCA_KIND, nl.ZeroTerminated("mirred"))
		// redirect to other interface
		mir := nl.TcMirred{
			Action:  nl.TC_ACT_STOLEN,
			Eaction: nl.TCA_EGRESS_REDIR,
			Ifindex: uint32(u32.RedirIndex),
		}
		aopts := nl.NewRtAttrChild(table, nl.TCA_OPTIONS, nil)
		nl.NewRtAttrChild(aopts, nl.TCA_MIRRED_PARMS, mir.Serialize())
	}
	req.AddData(options)
	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}

// QdiscAdd will add a qdisc to the system.
// Equivalent to: `tc qdisc add $qdisc`
func QdiscAdd(qdisc Qdisc) error {
	req := nl.NewNetlinkRequest(syscall.RTM_NEWQDISC, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
	base := qdisc.Attrs()
	msg := &nl.TcMsg{
		Family:  nl.FAMILY_ALL,
		Ifindex: int32(base.LinkIndex),
		Handle:  base.Handle,
		Parent:  base.Parent,
	}
	req.AddData(msg)
	req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(qdisc.Type())))

	options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
	if prio, ok := qdisc.(*Prio); ok {
		tcmap := nl.TcPrioMap{
			Bands:   int32(prio.Bands),
			Priomap: prio.PriorityMap,
		}
		options = nl.NewRtAttr(nl.TCA_OPTIONS, tcmap.Serialize())
	} else if tbf, ok := qdisc.(*Tbf); ok {
		opt := nl.TcTbfQopt{}
		// TODO: handle rate > uint32
		opt.Rate.Rate = uint32(tbf.Rate)
		opt.Limit = tbf.Limit
		opt.Buffer = tbf.Buffer
		nl.NewRtAttrChild(options, nl.TCA_TBF_PARMS, opt.Serialize())
	} else if htb, ok := qdisc.(*Htb); ok {
		opt := nl.TcHtbGlob{}
		opt.Version = htb.Version
		opt.Rate2Quantum = htb.Rate2Quantum
		opt.Defcls = htb.Defcls
		// TODO: Handle Debug properly. For now default to 0
		opt.Debug = htb.Debug
		opt.DirectPkts = htb.DirectPkts
		nl.NewRtAttrChild(options, nl.TCA_HTB_INIT, opt.Serialize())
		// nl.NewRtAttrChild(options, nl.TCA_HTB_DIRECT_QLEN, opt.Serialize())
	} else if _, ok := qdisc.(*Ingress); ok {
		// ingress filters must use the proper handle
		if msg.Parent != HANDLE_INGRESS {
			return fmt.Errorf("Ingress filters must set Parent to HANDLE_INGRESS")
		}
	}
	req.AddData(options)
	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}

func classPayload(req *nl.NetlinkRequest, class Class) error {
	req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(class.Type())))

	options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
	if htb, ok := class.(*HtbClass); ok {
		opt := nl.TcHtbCopt{}
		opt.Rate.Rate = uint32(htb.Rate)
		opt.Ceil.Rate = uint32(htb.Ceil)
		opt.Buffer = htb.Buffer
		opt.Cbuffer = htb.Cbuffer
		opt.Quantum = htb.Quantum
		opt.Level = htb.Level
		opt.Prio = htb.Prio
		// TODO: Handle Debug properly. For now default to 0
		nl.NewRtAttrChild(options, nl.TCA_HTB_PARMS, opt.Serialize())
	}
	req.AddData(options)
	return nil
}

// LinkByAlias finds a link by its alias and returns a pointer to the object.
// If there are multiple links with the alias it returns the first one
func (h *Handle) LinkByAlias(alias string) (Link, error) {
	if h.lookupByDump {
		return h.linkByAliasDump(alias)
	}

	req := h.newNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	req.AddData(msg)

	nameData := nl.NewRtAttr(syscall.IFLA_IFALIAS, nl.ZeroTerminated(alias))
	req.AddData(nameData)

	link, err := execGetLink(req)
	if err == syscall.EINVAL {
		// older kernels don't support looking up via IFLA_IFALIAS
		// so fall back to dumping all links
		h.lookupByDump = true
		return h.linkByAliasDump(alias)
	}

	return link, err
}

// LinkByName finds a link by name and returns a pointer to the object.
func LinkByName(name string) (Link, error) {
	if lookupByDump {
		return linkByNameDump(name)
	}

	req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	req.AddData(msg)

	nameData := nl.NewRtAttr(syscall.IFLA_IFNAME, nl.ZeroTerminated(name))
	req.AddData(nameData)

	link, err := execGetLink(req)
	if err == syscall.EINVAL {
		// older kernels don't support looking up via IFLA_IFNAME
		// so fall back to dumping all links
		lookupByDump = true
		return linkByNameDump(name)
	}

	return link, err
}

func addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error {
	base := link.Attrs()
	if addr.Label != "" && !strings.HasPrefix(addr.Label, base.Name) {
		return fmt.Errorf("label must begin with interface name")
	}
	ensureIndex(base)

	family := nl.GetIPFamily(addr.IP)

	msg := nl.NewIfAddrmsg(family)
	msg.Index = uint32(base.Index)
	prefixlen, _ := addr.Mask.Size()
	msg.Prefixlen = uint8(prefixlen)
	req.AddData(msg)

	var addrData []byte
	if family == FAMILY_V4 {
		addrData = addr.IP.To4()
	} else {
		addrData = addr.IP.To16()
	}

	localData := nl.NewRtAttr(syscall.IFA_LOCAL, addrData)
	req.AddData(localData)

	addressData := nl.NewRtAttr(syscall.IFA_ADDRESS, addrData)
	req.AddData(addressData)

	if addr.Label != "" {
		labelData := nl.NewRtAttr(syscall.IFA_LABEL, nl.ZeroTerminated(addr.Label))
		req.AddData(labelData)
	}

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}

func classPayload(req *nl.NetlinkRequest, class Class) error {
	req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(class.Type())))

	options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
	if htb, ok := class.(*HtbClass); ok {
		opt := nl.TcHtbCopt{}
		opt.Buffer = htb.Buffer
		opt.Cbuffer = htb.Cbuffer
		opt.Quantum = htb.Quantum
		opt.Level = htb.Level
		opt.Prio = htb.Prio
		// TODO: Handle Debug properly. For now default to 0
		/* Calculate {R,C}Tab and set Rate and Ceil */
		cellLog := -1
		ccellLog := -1
		linklayer := nl.LINKLAYER_ETHERNET
		mtu := 1600
		var rtab [256]uint32
		var ctab [256]uint32
		tcrate := nl.TcRateSpec{Rate: uint32(htb.Rate)}
		if CalcRtable(&tcrate, rtab, cellLog, uint32(mtu), linklayer) < 0 {
			return errors.New("HTB: failed to calculate rate table")
		}
		opt.Rate = tcrate
		tcceil := nl.TcRateSpec{Rate: uint32(htb.Ceil)}
		if CalcRtable(&tcceil, ctab, ccellLog, uint32(mtu), linklayer) < 0 {
			return errors.New("HTB: failed to calculate ceil rate table")
		}
		opt.Ceil = tcceil
		nl.NewRtAttrChild(options, nl.TCA_HTB_PARMS, opt.Serialize())
		nl.NewRtAttrChild(options, nl.TCA_HTB_RTAB, SerializeRtab(rtab))
		nl.NewRtAttrChild(options, nl.TCA_HTB_CTAB, SerializeRtab(ctab))
	}
	req.AddData(options)
	return nil
}

// LinkAdd adds a new link device. The type and features of the device
// are taken fromt the parameters in the link object.
// Equivalent to: `ip link add $link`
func (h *Handle) LinkAdd(link Link) error {
	// TODO: set mtu and hardware address
	// TODO: support extra data for macvlan
	base := link.Attrs()

	if base.Name == "" {
		return fmt.Errorf("LinkAttrs.Name cannot be empty!")
	}

	if tuntap, ok := link.(*Tuntap); ok {
		// TODO: support user
		// TODO: support group
		// TODO: multi_queue
		// TODO: support non- persistent
		if tuntap.Mode < syscall.IFF_TUN || tuntap.Mode > syscall.IFF_TAP {
			return fmt.Errorf("Tuntap.Mode %v unknown!", tuntap.Mode)
		}
		file, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
		if err != nil {
			return err
		}
		defer file.Close()
		var req ifReq
		if tuntap.Flags == 0 {
			req.Flags = uint16(TUNTAP_DEFAULTS)
		} else {
			req.Flags = uint16(tuntap.Flags)
		}
		req.Flags |= uint16(tuntap.Mode)
		copy(req.Name[:15], base.Name)
		_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, file.Fd(), uintptr(syscall.TUNSETIFF), uintptr(unsafe.Pointer(&req)))
		if errno != 0 {
			return fmt.Errorf("Tuntap IOCTL TUNSETIFF failed, errno %v", errno)
		}
		_, _, errno = syscall.Syscall(syscall.SYS_IOCTL, file.Fd(), uintptr(syscall.TUNSETPERSIST), 1)
		if errno != 0 {
			return fmt.Errorf("Tuntap IOCTL TUNSETPERSIST failed, errno %v", errno)
		}
		h.ensureIndex(base)

		// can't set master during create, so set it afterwards
		if base.MasterIndex != 0 {
			// TODO: verify MasterIndex is actually a bridge?
			return h.LinkSetMasterByIndex(link, base.MasterIndex)
		}
		return nil
	}

	req := h.newNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	// TODO: make it shorter
	if base.Flags&net.FlagUp != 0 {
		msg.Change = syscall.IFF_UP
		msg.Flags = syscall.IFF_UP
	}
	if base.Flags&net.FlagBroadcast != 0 {
		msg.Change |= syscall.IFF_BROADCAST
		msg.Flags |= syscall.IFF_BROADCAST
	}
	if base.Flags&net.FlagLoopback != 0 {
		msg.Change |= syscall.IFF_LOOPBACK
		msg.Flags |= syscall.IFF_LOOPBACK
	}
	if base.Flags&net.FlagPointToPoint != 0 {
		msg.Change |= syscall.IFF_POINTOPOINT
		msg.Flags |= syscall.IFF_POINTOPOINT
	}
	if base.Flags&net.FlagMulticast != 0 {
		msg.Change |= syscall.IFF_MULTICAST
		msg.Flags |= syscall.IFF_MULTICAST
	}
	req.AddData(msg)

	if base.ParentIndex != 0 {
		b := make([]byte, 4)
		native.PutUint32(b, uint32(base.ParentIndex))
		data := nl.NewRtAttr(syscall.IFLA_LINK, b)
		req.AddData(data)
	} else if link.Type() == "ipvlan" {
		return fmt.Errorf("Can't create ipvlan link without ParentIndex")
	}

	nameData := nl.NewRtAttr(syscall.IFLA_IFNAME, nl.ZeroTerminated(base.Name))
	req.AddData(nameData)

	if base.MTU > 0 {
		mtu := nl.NewRtAttr(syscall.IFLA_MTU, nl.Uint32Attr(uint32(base.MTU)))
		req.AddData(mtu)
	}

	if base.TxQLen >= 0 {
		qlen := nl.NewRtAttr(syscall.IFLA_TXQLEN, nl.Uint32Attr(uint32(base.TxQLen)))
		req.AddData(qlen)
	}

	if base.Namespace != nil {
//.........这里部分代码省略.........