// 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 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: support non- one_queue
// TODO: support pi | vnet_hdr | multi_queue
// TODO: support non- exclusive
// 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
req.Flags |= syscall.IFF_ONE_QUEUE
req.Flags |= syscall.IFF_TUN_EXCL
copy(req.Name[:15], base.Name)
req.Flags |= uint16(tuntap.Mode)
_, _, 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)
}
ensureIndex(base)
// can't set master during create, so set it afterwards
if base.MasterIndex != 0 {
// TODO: verify MasterIndex is actually a bridge?
return LinkSetMasterByIndex(link, base.MasterIndex)
}
return nil
}
req := nl.NewNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
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 {
var attr *nl.RtAttr
switch base.Namespace.(type) {
case NsPid:
val := nl.Uint32Attr(uint32(base.Namespace.(NsPid)))
attr = nl.NewRtAttr(syscall.IFLA_NET_NS_PID, val)
case NsFd:
val := nl.Uint32Attr(uint32(base.Namespace.(NsFd)))
attr = nl.NewRtAttr(nl.IFLA_NET_NS_FD, val)
}
req.AddData(attr)
}
linkInfo := nl.NewRtAttr(syscall.IFLA_LINKINFO, nil)
nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_KIND, nl.NonZeroTerminated(link.Type()))
if vlan, ok := link.(*Vlan); ok {
b := make([]byte, 2)
native.PutUint16(b, uint16(vlan.VlanId))
data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
nl.NewRtAttrChild(data, nl.IFLA_VLAN_ID, b)
} else if veth, ok := link.(*Veth); ok {
data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
peer := nl.NewRtAttrChild(data, nl.VETH_INFO_PEER, nil)
nl.NewIfInfomsgChild(peer, syscall.AF_UNSPEC)
nl.NewRtAttrChild(peer, syscall.IFLA_IFNAME, nl.ZeroTerminated(veth.PeerName))
if base.TxQLen >= 0 {
nl.NewRtAttrChild(peer, syscall.IFLA_TXQLEN, nl.Uint32Attr(uint32(base.TxQLen)))
}
if base.MTU > 0 {
nl.NewRtAttrChild(peer, syscall.IFLA_MTU, nl.Uint32Attr(uint32(base.MTU)))
}
} else if vxlan, ok := link.(*Vxlan); ok {
addVxlanAttrs(vxlan, linkInfo)
} else if ipv, ok := link.(*IPVlan); ok {
data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
nl.NewRtAttrChild(data, nl.IFLA_IPVLAN_MODE, nl.Uint16Attr(uint16(ipv.Mode)))
} else if macv, ok := link.(*Macvlan); ok {
if macv.Mode != MACVLAN_MODE_DEFAULT {
data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
nl.NewRtAttrChild(data, nl.IFLA_MACVLAN_MODE, nl.Uint32Attr(macvlanModes[macv.Mode]))
}
}
req.AddData(linkInfo)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
if err != nil {
return err
}
ensureIndex(base)
// can't set master during create, so set it afterwards
if base.MasterIndex != 0 {
// TODO: verify MasterIndex is actually a bridge?
return LinkSetMasterByIndex(link, base.MasterIndex)
}
return nil
}
func addVxlanAttrs(vxlan *Vxlan, linkInfo *nl.RtAttr) {
data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_ID, nl.Uint32Attr(uint32(vxlan.VxlanId)))
if vxlan.VtepDevIndex != 0 {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_LINK, nl.Uint32Attr(uint32(vxlan.VtepDevIndex)))
}
if vxlan.SrcAddr != nil {
ip := vxlan.SrcAddr.To4()
if ip != nil {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_LOCAL, []byte(ip))
} else {
ip = vxlan.SrcAddr.To16()
if ip != nil {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_LOCAL6, []byte(ip))
}
}
}
if vxlan.Group != nil {
group := vxlan.Group.To4()
if group != nil {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_GROUP, []byte(group))
} else {
group = vxlan.Group.To16()
if group != nil {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_GROUP6, []byte(group))
}
}
}
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_TTL, nl.Uint8Attr(uint8(vxlan.TTL)))
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_TOS, nl.Uint8Attr(uint8(vxlan.TOS)))
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_LEARNING, boolAttr(vxlan.Learning))
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_PROXY, boolAttr(vxlan.Proxy))
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_RSC, boolAttr(vxlan.RSC))
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_L2MISS, boolAttr(vxlan.L2miss))
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_L3MISS, boolAttr(vxlan.L3miss))
if vxlan.GBP {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_GBP, boolAttr(vxlan.GBP))
}
if vxlan.NoAge {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_AGEING, nl.Uint32Attr(0))
} else if vxlan.Age > 0 {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_AGEING, nl.Uint32Attr(uint32(vxlan.Age)))
}
if vxlan.Limit > 0 {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_LIMIT, nl.Uint32Attr(uint32(vxlan.Limit)))
}
if vxlan.Port > 0 {
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_PORT, nl.Uint16Attr(uint16(vxlan.Port)))
}
if vxlan.PortLow > 0 || vxlan.PortHigh > 0 {
pr := vxlanPortRange{uint16(vxlan.PortLow), uint16(vxlan.PortHigh)}
buf := new(bytes.Buffer)
binary.Write(buf, binary.BigEndian, &pr)
nl.NewRtAttrChild(data, nl.IFLA_VXLAN_PORT_RANGE, buf.Bytes())
}
}