// LinkList gets a list of link devices.
// Equivalent to: `ip link show`
func LinkList() ([]Link, error) {
// NOTE(vish): This duplicates functionality in net/iface_linux.go, but we need
// to get the message ourselves to parse link type.
req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWLINK)
if err != nil {
return nil, err
}
res := make([]Link, 0)
for _, m := range msgs {
link, err := linkDeserialize(m)
if err != nil {
return nil, err
}
res = append(res, link)
}
return res, nil
}
// 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)
}
}
// LinkByIndex finds a link by index and returns a pointer to the object.
func (h *Handle) LinkByIndex(index int) (Link, error) {
req := h.newNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(index)
req.AddData(msg)
return execGetLink(req)
}
// XfrmPolicyList gets a list of xfrm policies in the system.
// Equivalent to: `ip xfrm policy show`.
// The list can be filtered by ip family.
func XfrmPolicyList(family int) ([]XfrmPolicy, error) {
req := nl.NewNetlinkRequest(nl.XFRM_MSG_GETPOLICY, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_XFRM, nl.XFRM_MSG_NEWPOLICY)
if err != nil {
return nil, err
}
var res []XfrmPolicy
for _, m := range msgs {
msg := nl.DeserializeXfrmUserpolicyInfo(m)
if family != FAMILY_ALL && family != int(msg.Sel.Family) {
continue
}
var policy XfrmPolicy
policy.Dst = msg.Sel.Daddr.ToIPNet(msg.Sel.PrefixlenD)
policy.Src = msg.Sel.Saddr.ToIPNet(msg.Sel.PrefixlenS)
policy.Priority = int(msg.Priority)
policy.Index = int(msg.Index)
policy.Dir = Dir(msg.Dir)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.XFRMA_TMPL:
max := len(attr.Value)
for i := 0; i < max; i += nl.SizeofXfrmUserTmpl {
var resTmpl XfrmPolicyTmpl
tmpl := nl.DeserializeXfrmUserTmpl(attr.Value[i : i+nl.SizeofXfrmUserTmpl])
resTmpl.Dst = tmpl.XfrmId.Daddr.ToIP()
resTmpl.Src = tmpl.Saddr.ToIP()
resTmpl.Proto = Proto(tmpl.XfrmId.Proto)
resTmpl.Mode = Mode(tmpl.Mode)
resTmpl.Reqid = int(tmpl.Reqid)
policy.Tmpls = append(policy.Tmpls, resTmpl)
}
}
}
res = append(res, policy)
}
return res, nil
}
func LinkGetProtinfo(link Link) (Protinfo, error) {
base := link.Attrs()
ensureIndex(base)
var pi Protinfo
req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(syscall.AF_BRIDGE)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, 0)
if err != nil {
return pi, err
}
for _, m := range msgs {
ans := nl.DeserializeIfInfomsg(m)
if int(ans.Index) != base.Index {
continue
}
attrs, err := nl.ParseRouteAttr(m[ans.Len():])
if err != nil {
return pi, err
}
for _, attr := range attrs {
if attr.Attr.Type != syscall.IFLA_PROTINFO|syscall.NLA_F_NESTED {
continue
}
infos, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return pi, err
}
var pi Protinfo
for _, info := range infos {
switch info.Attr.Type {
case nl.IFLA_BRPORT_MODE:
pi.Hairpin = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_GUARD:
pi.Guard = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_FAST_LEAVE:
pi.FastLeave = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_PROTECT:
pi.RootBlock = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_LEARNING:
pi.Learning = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_UNICAST_FLOOD:
pi.Flood = byteToBool(info.Value[0])
}
}
return pi, nil
}
}
return pi, fmt.Errorf("Device with index %d not found", base.Index)
}
// LinkSetDown disables link device.
// Equivalent to: `ip link set $link down`
func LinkSetDown(link Link) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Change = syscall.IFF_UP
msg.Flags = 0 & ^syscall.IFF_UP
msg.Index = int32(base.Index)
req.AddData(msg)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetXdpFd adds a bpf function to the driver. The fd must be a bpf
// program loaded with bpf(type=BPF_PROG_TYPE_XDP)
func LinkSetXdpFd(link Link, fd int) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
addXdpAttrs(&LinkXdp{Fd: fd}, req)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
func (h *Handle) SetPromiscOff(link Link) error {
base := link.Attrs()
h.ensureIndex(base)
req := h.newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Change = syscall.IFF_PROMISC
msg.Flags = 0 & ^syscall.IFF_UP
msg.Index = int32(base.Index)
req.AddData(msg)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkDel deletes link device. Either Index or Name must be set in
// the link object for it to be deleted. The other values are ignored.
// Equivalent to: `ip link del $link`
func (h *Handle) LinkDel(link Link) error {
base := link.Attrs()
h.ensureIndex(base)
req := h.newNetlinkRequest(syscall.RTM_DELLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetAlias sets the alias of the link device.
// Equivalent to: `ip link set dev $link alias $name`
func (h *Handle) LinkSetAlias(link Link, name string) error {
base := link.Attrs()
h.ensureIndex(base)
req := h.newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
data := nl.NewRtAttr(syscall.IFLA_IFALIAS, []byte(name))
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetHardwareAddr sets the hardware address of the link device.
// Equivalent to: `ip link set $link address $hwaddr`
func (h *Handle) LinkSetHardwareAddr(link Link, hwaddr net.HardwareAddr) error {
base := link.Attrs()
h.ensureIndex(base)
req := h.newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
data := nl.NewRtAttr(syscall.IFLA_ADDRESS, []byte(hwaddr))
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// AddrList gets a list of IP addresses in the system.
// Equivalent to: `ip addr show`.
// The list can be filtered by link and ip family.
func AddrList(link Link, family int) ([]Addr, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETADDR, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWADDR)
if err != nil {
return nil, err
}
index := 0
if link != nil {
base := link.Attrs()
ensureIndex(base)
index = base.Index
}
res := make([]Addr, 0)
for _, m := range msgs {
msg := nl.DeserializeIfAddrmsg(m)
if link != nil && msg.Index != uint32(index) {
// Ignore messages from other interfaces
continue
}
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
var addr Addr
for _, attr := range attrs {
switch attr.Attr.Type {
case syscall.IFA_ADDRESS:
addr.IPNet = &net.IPNet{
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
}
case syscall.IFA_LABEL:
addr.Label = string(attr.Value[:len(attr.Value)-1])
}
}
res = append(res, addr)
}
return res, nil
}
// RouteList gets a list of routes in the system.
// Equivalent to: `ip route show`.
// The list can be filtered by link and ip family.
func RouteList(link Link, family int) ([]Route, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETROUTE, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWROUTE)
if err != nil {
return nil, err
}
index := 0
if link != nil {
base := link.Attrs()
ensureIndex(base)
index = base.Index
}
var res []Route
for _, m := range msgs {
msg := nl.DeserializeRtMsg(m)
if msg.Flags&syscall.RTM_F_CLONED != 0 {
// Ignore cloned routes
continue
}
if msg.Table != syscall.RT_TABLE_MAIN {
// Ignore non-main tables
continue
}
route, err := deserializeRoute(m)
if err != nil {
return nil, err
}
if link != nil && route.LinkIndex != index {
// Ignore routes from other interfaces
continue
}
res = append(res, route)
}
return res, nil
}
// LinkSetMTU sets the mtu of the link device.
// Equivalent to: `ip link set $link mtu $mtu`
func LinkSetMTU(link Link, mtu int) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
b := make([]byte, 4)
native.PutUint32(b, uint32(mtu))
data := nl.NewRtAttr(syscall.IFLA_MTU, b)
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetHardwareAddr sets the hardware address of the link device.
// Equivalent to: `ip link set $link address $hwaddr`
func LinkSetHardwareAddr(link Link, hwaddr net.HardwareAddr) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Type = syscall.RTM_SETLINK
msg.Flags = syscall.NLM_F_REQUEST
msg.Index = int32(base.Index)
msg.Change = nl.DEFAULT_CHANGE
req.AddData(msg)
data := nl.NewRtAttr(syscall.IFLA_ADDRESS, []byte(hwaddr))
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetName sets the name of the link device.
// Equivalent to: `ip link set $link name $name`
func LinkSetName(link Link, name string) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Type = syscall.RTM_SETLINK
msg.Flags = syscall.NLM_F_REQUEST
msg.Index = int32(base.Index)
msg.Change = syscall.IFLA_IFNAME
req.AddData(msg)
data := nl.NewRtAttr(syscall.IFLA_IFNAME, []byte(name))
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
func (h *Handle) setProtinfoAttr(link Link, mode bool, attr int) error {
base := link.Attrs()
h.ensureIndex(base)
req := h.newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_BRIDGE)
msg.Index = int32(base.Index)
req.AddData(msg)
br := nl.NewRtAttr(syscall.IFLA_PROTINFO|syscall.NLA_F_NESTED, nil)
nl.NewRtAttrChild(br, attr, boolToByte(mode))
req.AddData(br)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
if err != nil {
return err
}
return nil
}
// LinkSetNsFd puts the device into a new network namespace. The
// fd must be an open file descriptor to a network namespace.
// Similar to: `ip link set $link netns $ns`
func (h *Handle) LinkSetNsFd(link Link, fd int) error {
base := link.Attrs()
h.ensureIndex(base)
req := h.newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
b := make([]byte, 4)
native.PutUint32(b, uint32(fd))
data := nl.NewRtAttr(nl.IFLA_NET_NS_FD, b)
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetMasterByIndex sets the master of the link device.
// Equivalent to: `ip link set $link master $master`
func LinkSetMasterByIndex(link Link, masterIndex int) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Type = syscall.RTM_SETLINK
msg.Flags = syscall.NLM_F_REQUEST
msg.Index = int32(base.Index)
msg.Change = nl.DEFAULT_CHANGE
req.AddData(msg)
b := make([]byte, 4)
native.PutUint32(b, uint32(masterIndex))
data := nl.NewRtAttr(syscall.IFLA_MASTER, b)
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetVfVlan sets the vlan of a vf for the link.
// Equivalent to: `ip link set $link vf $vf vlan $vlan`
func LinkSetVfVlan(link Link, vf, vlan int) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
data := nl.NewRtAttr(nl.IFLA_VFINFO_LIST, nil)
info := nl.NewRtAttrChild(data, nl.IFLA_VF_INFO, nil)
vfmsg := nl.VfVlan{
Vf: uint32(vf),
Vlan: uint32(vlan),
}
nl.NewRtAttrChild(info, nl.IFLA_VF_VLAN, vfmsg.Serialize())
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
func setProtinfoAttr(link Link, mode bool, attr int) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_BRIDGE)
msg.Type = syscall.RTM_SETLINK
msg.Flags = syscall.NLM_F_REQUEST
msg.Index = int32(base.Index)
msg.Change = nl.DEFAULT_CHANGE
req.AddData(msg)
br := nl.NewRtAttr(syscall.IFLA_PROTINFO|syscall.NLA_F_NESTED, nil)
nl.NewRtAttrChild(br, attr, boolToByte(mode))
req.AddData(br)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
if err != nil {
return err
}
return nil
}
// LinkSetVfTxRate sets the tx rate of a vf for the link.
// Equivalent to: `ip link set $link vf $vf rate $rate`
func (h *Handle) LinkSetVfTxRate(link Link, vf, rate int) error {
base := link.Attrs()
h.ensureIndex(base)
req := h.newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
data := nl.NewRtAttr(nl.IFLA_VFINFO_LIST, nil)
info := nl.NewRtAttrChild(data, nl.IFLA_VF_INFO, nil)
vfmsg := nl.VfTxRate{
Vf: uint32(vf),
Rate: uint32(rate),
}
nl.NewRtAttrChild(info, nl.IFLA_VF_TX_RATE, vfmsg.Serialize())
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetVfHardwareAddr sets the hardware address of a vf for the link.
// Equivalent to: `ip link set $link vf $vf mac $hwaddr`
func (h *Handle) LinkSetVfHardwareAddr(link Link, vf int, hwaddr net.HardwareAddr) error {
base := link.Attrs()
h.ensureIndex(base)
req := h.newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Index = int32(base.Index)
req.AddData(msg)
data := nl.NewRtAttr(nl.IFLA_VFINFO_LIST, nil)
info := nl.NewRtAttrChild(data, nl.IFLA_VF_INFO, nil)
vfmsg := nl.VfMac{
Vf: uint32(vf),
}
copy(vfmsg.Mac[:], []byte(hwaddr))
nl.NewRtAttrChild(info, nl.IFLA_VF_MAC, vfmsg.Serialize())
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// LinkSetNsPid puts the device into a new network namespace. The
// pid must be a pid of a running process.
// Equivalent to: `ip link set $link netns $pid`
func LinkSetNsPid(link Link, nspid int) error {
base := link.Attrs()
ensureIndex(base)
req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
msg.Type = syscall.RTM_SETLINK
msg.Flags = syscall.NLM_F_REQUEST
msg.Index = int32(base.Index)
msg.Change = syscall.IFLA_NET_NS_PID
req.AddData(msg)
b := make([]byte, 4)
native.PutUint32(b, uint32(nspid))
data := nl.NewRtAttr(syscall.IFLA_NET_NS_PID, b)
req.AddData(data)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// AddrList gets a list of IP addresses in the system.
// Equivalent to: `ip addr show`.
// The list can be filtered by link and ip family.
func AddrList(link Link, family int) ([]Addr, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETADDR, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWADDR)
if err != nil {
return nil, err
}
indexFilter := 0
if link != nil {
base := link.Attrs()
ensureIndex(base)
indexFilter = base.Index
}
var res []Addr
for _, m := range msgs {
addr, family, ifindex, err := parseAddr(m)
if err != nil {
return res, err
}
if link != nil && ifindex != indexFilter {
// Ignore messages from other interfaces
continue
}
if family != FAMILY_ALL && msg.Family != uint8(family) {
continue
}
res = append(res, addr)
}
return res, 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
}
// XfrmPolicyList gets a list of xfrm policies in the system.
// Equivalent to: `ip xfrm policy show`.
// The list can be filtered by ip family.
func (h *Handle) XfrmPolicyList(family int) ([]XfrmPolicy, error) {
req := h.newNetlinkRequest(nl.XFRM_MSG_GETPOLICY, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_XFRM, nl.XFRM_MSG_NEWPOLICY)
if err != nil {
return nil, err
}
var res []XfrmPolicy
for _, m := range msgs {
if policy, err := parseXfrmPolicy(m, family); err == nil {
res = append(res, *policy)
} else if err == familyError {
continue
} else {
return nil, err
}
}
return res, nil
}
func (h *Handle) LinkGetProtinfo(link Link) (Protinfo, error) {
base := link.Attrs()
h.ensureIndex(base)
var pi Protinfo
req := h.newNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(syscall.AF_BRIDGE)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, 0)
if err != nil {
return pi, err
}
for _, m := range msgs {
ans := nl.DeserializeIfInfomsg(m)
if int(ans.Index) != base.Index {
continue
}
attrs, err := nl.ParseRouteAttr(m[ans.Len():])
if err != nil {
return pi, err
}
for _, attr := range attrs {
if attr.Attr.Type != syscall.IFLA_PROTINFO|syscall.NLA_F_NESTED {
continue
}
infos, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return pi, err
}
pi = *parseProtinfo(infos)
return pi, nil
}
}
return pi, fmt.Errorf("Device with index %d not found", base.Index)
}
// 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 {
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)
}
if base.Xdp != nil {
addXdpAttrs(base.Xdp, req)
}
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 bond, ok := link.(*Bond); ok {
addBondAttrs(bond, 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]))
}
} else if macv, ok := link.(*Macvtap); 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]))
}
} else if gretap, ok := link.(*Gretap); ok {
addGretapAttrs(gretap, linkInfo)
} else if iptun, ok := link.(*Iptun); ok {
addIptunAttrs(iptun, linkInfo)
} else if vti, ok := link.(*Vti); ok {
addVtiAttrs(vti, linkInfo)
}
req.AddData(linkInfo)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
if err != nil {
return err
}
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
}