384 lines
10 KiB
Go
384 lines
10 KiB
Go
package netlink
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import (
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"bytes"
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"encoding/binary"
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"encoding/hex"
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"errors"
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"fmt"
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"syscall"
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"github.com/vishvananda/netlink/nl"
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"golang.org/x/sys/unix"
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)
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// Internal tc_stats representation in Go struct.
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// This is for internal uses only to deserialize the payload of rtattr.
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// After the deserialization, this should be converted into the canonical stats
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// struct, ClassStatistics, in case of statistics of a class.
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// Ref: struct tc_stats { ... }
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type tcStats struct {
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Bytes uint64 // Number of enqueued bytes
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Packets uint32 // Number of enqueued packets
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Drops uint32 // Packets dropped because of lack of resources
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Overlimits uint32 // Number of throttle events when this flow goes out of allocated bandwidth
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Bps uint32 // Current flow byte rate
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Pps uint32 // Current flow packet rate
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Qlen uint32
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Backlog uint32
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}
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// NewHtbClass NOTE: function is in here because it uses other linux functions
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func NewHtbClass(attrs ClassAttrs, cattrs HtbClassAttrs) *HtbClass {
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mtu := 1600
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rate := cattrs.Rate / 8
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ceil := cattrs.Ceil / 8
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buffer := cattrs.Buffer
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cbuffer := cattrs.Cbuffer
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if ceil == 0 {
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ceil = rate
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}
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if buffer == 0 {
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buffer = uint32(float64(rate)/Hz() + float64(mtu))
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}
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buffer = uint32(Xmittime(rate, buffer))
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if cbuffer == 0 {
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cbuffer = uint32(float64(ceil)/Hz() + float64(mtu))
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}
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cbuffer = uint32(Xmittime(ceil, cbuffer))
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return &HtbClass{
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ClassAttrs: attrs,
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Rate: rate,
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Ceil: ceil,
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Buffer: buffer,
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Cbuffer: cbuffer,
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Quantum: 10,
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Level: 0,
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Prio: 0,
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}
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}
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// ClassDel will delete a class from the system.
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// Equivalent to: `tc class del $class`
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func ClassDel(class Class) error {
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return pkgHandle.ClassDel(class)
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}
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// ClassDel will delete a class from the system.
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// Equivalent to: `tc class del $class`
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func (h *Handle) ClassDel(class Class) error {
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return h.classModify(unix.RTM_DELTCLASS, 0, class)
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}
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// ClassChange will change a class in place
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// Equivalent to: `tc class change $class`
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// The parent and handle MUST NOT be changed.
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func ClassChange(class Class) error {
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return pkgHandle.ClassChange(class)
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}
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// ClassChange will change a class in place
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// Equivalent to: `tc class change $class`
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// The parent and handle MUST NOT be changed.
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func (h *Handle) ClassChange(class Class) error {
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return h.classModify(unix.RTM_NEWTCLASS, 0, class)
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}
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// ClassReplace will replace a class to the system.
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// quivalent to: `tc class replace $class`
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// The handle MAY be changed.
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// If a class already exist with this parent/handle pair, the class is changed.
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// If a class does not already exist with this parent/handle, a new class is created.
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func ClassReplace(class Class) error {
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return pkgHandle.ClassReplace(class)
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}
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// ClassReplace will replace a class to the system.
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// quivalent to: `tc class replace $class`
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// The handle MAY be changed.
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// If a class already exist with this parent/handle pair, the class is changed.
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// If a class does not already exist with this parent/handle, a new class is created.
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func (h *Handle) ClassReplace(class Class) error {
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return h.classModify(unix.RTM_NEWTCLASS, unix.NLM_F_CREATE, class)
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}
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// ClassAdd will add a class to the system.
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// Equivalent to: `tc class add $class`
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func ClassAdd(class Class) error {
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return pkgHandle.ClassAdd(class)
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}
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// ClassAdd will add a class to the system.
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// Equivalent to: `tc class add $class`
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func (h *Handle) ClassAdd(class Class) error {
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return h.classModify(
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unix.RTM_NEWTCLASS,
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unix.NLM_F_CREATE|unix.NLM_F_EXCL,
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class,
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)
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}
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func (h *Handle) classModify(cmd, flags int, class Class) error {
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req := h.newNetlinkRequest(cmd, flags|unix.NLM_F_ACK)
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base := class.Attrs()
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msg := &nl.TcMsg{
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Family: nl.FAMILY_ALL,
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Ifindex: int32(base.LinkIndex),
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Handle: base.Handle,
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Parent: base.Parent,
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}
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req.AddData(msg)
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if cmd != unix.RTM_DELTCLASS {
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if err := classPayload(req, class); err != nil {
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return err
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}
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}
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_, err := req.Execute(unix.NETLINK_ROUTE, 0)
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return err
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}
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func classPayload(req *nl.NetlinkRequest, class Class) error {
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req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(class.Type())))
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options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
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switch class.Type() {
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case "htb":
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htb := class.(*HtbClass)
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opt := nl.TcHtbCopt{}
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opt.Buffer = htb.Buffer
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opt.Cbuffer = htb.Cbuffer
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opt.Quantum = htb.Quantum
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opt.Level = htb.Level
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opt.Prio = htb.Prio
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// TODO: Handle Debug properly. For now default to 0
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/* Calculate {R,C}Tab and set Rate and Ceil */
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cellLog := -1
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ccellLog := -1
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linklayer := nl.LINKLAYER_ETHERNET
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mtu := 1600
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var rtab [256]uint32
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var ctab [256]uint32
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tcrate := nl.TcRateSpec{Rate: uint32(htb.Rate)}
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if CalcRtable(&tcrate, rtab[:], cellLog, uint32(mtu), linklayer) < 0 {
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return errors.New("HTB: failed to calculate rate table")
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}
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opt.Rate = tcrate
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tcceil := nl.TcRateSpec{Rate: uint32(htb.Ceil)}
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if CalcRtable(&tcceil, ctab[:], ccellLog, uint32(mtu), linklayer) < 0 {
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return errors.New("HTB: failed to calculate ceil rate table")
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}
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opt.Ceil = tcceil
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options.AddRtAttr(nl.TCA_HTB_PARMS, opt.Serialize())
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options.AddRtAttr(nl.TCA_HTB_RTAB, SerializeRtab(rtab))
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options.AddRtAttr(nl.TCA_HTB_CTAB, SerializeRtab(ctab))
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case "hfsc":
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hfsc := class.(*HfscClass)
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opt := nl.HfscCopt{}
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opt.Rsc.Set(hfsc.Rsc.Attrs())
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opt.Fsc.Set(hfsc.Fsc.Attrs())
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opt.Usc.Set(hfsc.Usc.Attrs())
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options.AddRtAttr(nl.TCA_HFSC_RSC, nl.SerializeHfscCurve(&opt.Rsc))
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options.AddRtAttr(nl.TCA_HFSC_FSC, nl.SerializeHfscCurve(&opt.Fsc))
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options.AddRtAttr(nl.TCA_HFSC_USC, nl.SerializeHfscCurve(&opt.Usc))
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}
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req.AddData(options)
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return nil
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}
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// ClassList gets a list of classes in the system.
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// Equivalent to: `tc class show`.
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// Generally returns nothing if link and parent are not specified.
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func ClassList(link Link, parent uint32) ([]Class, error) {
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return pkgHandle.ClassList(link, parent)
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}
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// ClassList gets a list of classes in the system.
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// Equivalent to: `tc class show`.
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// Generally returns nothing if link and parent are not specified.
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func (h *Handle) ClassList(link Link, parent uint32) ([]Class, error) {
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req := h.newNetlinkRequest(unix.RTM_GETTCLASS, unix.NLM_F_DUMP)
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msg := &nl.TcMsg{
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Family: nl.FAMILY_ALL,
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Parent: parent,
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}
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if link != nil {
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base := link.Attrs()
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h.ensureIndex(base)
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msg.Ifindex = int32(base.Index)
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}
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req.AddData(msg)
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msgs, err := req.Execute(unix.NETLINK_ROUTE, unix.RTM_NEWTCLASS)
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if err != nil {
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return nil, err
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}
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var res []Class
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for _, m := range msgs {
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msg := nl.DeserializeTcMsg(m)
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attrs, err := nl.ParseRouteAttr(m[msg.Len():])
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if err != nil {
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return nil, err
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}
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base := ClassAttrs{
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LinkIndex: int(msg.Ifindex),
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Handle: msg.Handle,
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Parent: msg.Parent,
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Statistics: nil,
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}
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var class Class
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classType := ""
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for _, attr := range attrs {
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switch attr.Attr.Type {
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case nl.TCA_KIND:
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classType = string(attr.Value[:len(attr.Value)-1])
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switch classType {
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case "htb":
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class = &HtbClass{}
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case "hfsc":
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class = &HfscClass{}
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default:
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class = &GenericClass{ClassType: classType}
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}
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case nl.TCA_OPTIONS:
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switch classType {
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case "htb":
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data, err := nl.ParseRouteAttr(attr.Value)
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if err != nil {
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return nil, err
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}
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_, err = parseHtbClassData(class, data)
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if err != nil {
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return nil, err
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}
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case "hfsc":
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data, err := nl.ParseRouteAttr(attr.Value)
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if err != nil {
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return nil, err
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}
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_, err = parseHfscClassData(class, data)
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if err != nil {
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return nil, err
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}
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}
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// For backward compatibility.
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case nl.TCA_STATS:
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base.Statistics, err = parseTcStats(attr.Value)
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if err != nil {
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return nil, err
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}
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case nl.TCA_STATS2:
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base.Statistics, err = parseTcStats2(attr.Value)
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if err != nil {
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return nil, err
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}
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}
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}
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*class.Attrs() = base
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res = append(res, class)
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}
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return res, nil
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}
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func parseHtbClassData(class Class, data []syscall.NetlinkRouteAttr) (bool, error) {
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htb := class.(*HtbClass)
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detailed := false
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for _, datum := range data {
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switch datum.Attr.Type {
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case nl.TCA_HTB_PARMS:
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opt := nl.DeserializeTcHtbCopt(datum.Value)
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htb.Rate = uint64(opt.Rate.Rate)
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htb.Ceil = uint64(opt.Ceil.Rate)
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htb.Buffer = opt.Buffer
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htb.Cbuffer = opt.Cbuffer
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htb.Quantum = opt.Quantum
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htb.Level = opt.Level
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htb.Prio = opt.Prio
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}
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}
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return detailed, nil
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}
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func parseHfscClassData(class Class, data []syscall.NetlinkRouteAttr) (bool, error) {
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hfsc := class.(*HfscClass)
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detailed := false
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for _, datum := range data {
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m1, d, m2 := nl.DeserializeHfscCurve(datum.Value).Attrs()
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switch datum.Attr.Type {
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case nl.TCA_HFSC_RSC:
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hfsc.Rsc = ServiceCurve{m1: m1, d: d, m2: m2}
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case nl.TCA_HFSC_FSC:
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hfsc.Fsc = ServiceCurve{m1: m1, d: d, m2: m2}
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case nl.TCA_HFSC_USC:
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hfsc.Usc = ServiceCurve{m1: m1, d: d, m2: m2}
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}
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}
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return detailed, nil
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}
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func parseTcStats(data []byte) (*ClassStatistics, error) {
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buf := &bytes.Buffer{}
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buf.Write(data)
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native := nl.NativeEndian()
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tcStats := &tcStats{}
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if err := binary.Read(buf, native, tcStats); err != nil {
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return nil, err
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}
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stats := NewClassStatistics()
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stats.Basic.Bytes = tcStats.Bytes
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stats.Basic.Packets = tcStats.Packets
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stats.Queue.Qlen = tcStats.Qlen
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stats.Queue.Backlog = tcStats.Backlog
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stats.Queue.Drops = tcStats.Drops
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stats.Queue.Overlimits = tcStats.Overlimits
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stats.RateEst.Bps = tcStats.Bps
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stats.RateEst.Pps = tcStats.Pps
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return stats, nil
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}
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func parseGnetStats(data []byte, gnetStats interface{}) error {
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buf := &bytes.Buffer{}
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buf.Write(data)
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native := nl.NativeEndian()
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return binary.Read(buf, native, gnetStats)
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}
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func parseTcStats2(data []byte) (*ClassStatistics, error) {
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rtAttrs, err := nl.ParseRouteAttr(data)
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if err != nil {
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return nil, err
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}
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stats := NewClassStatistics()
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for _, datum := range rtAttrs {
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switch datum.Attr.Type {
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case nl.TCA_STATS_BASIC:
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if err := parseGnetStats(datum.Value, stats.Basic); err != nil {
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return nil, fmt.Errorf("Failed to parse ClassStatistics.Basic with: %v\n%s",
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err, hex.Dump(datum.Value))
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}
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case nl.TCA_STATS_QUEUE:
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if err := parseGnetStats(datum.Value, stats.Queue); err != nil {
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return nil, fmt.Errorf("Failed to parse ClassStatistics.Queue with: %v\n%s",
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err, hex.Dump(datum.Value))
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}
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case nl.TCA_STATS_RATE_EST:
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if err := parseGnetStats(datum.Value, stats.RateEst); err != nil {
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return nil, fmt.Errorf("Failed to parse ClassStatistics.RateEst with: %v\n%s",
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err, hex.Dump(datum.Value))
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}
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}
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}
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return stats, nil
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}
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