package netlink import ( "fmt" "io/ioutil" "strconv" "strings" "syscall" "github.com/vishvananda/netlink/nl" ) // NOTE function is here because it uses other linux functions func NewNetem(attrs QdiscAttrs, nattrs NetemQdiscAttrs) *Netem { var limit uint32 = 1000 var lossCorr, delayCorr, duplicateCorr uint32 var reorderProb, reorderCorr uint32 var corruptProb, corruptCorr uint32 latency := nattrs.Latency loss := Percentage2u32(nattrs.Loss) gap := nattrs.Gap duplicate := Percentage2u32(nattrs.Duplicate) jitter := nattrs.Jitter // Correlation if latency > 0 && jitter > 0 { delayCorr = Percentage2u32(nattrs.DelayCorr) } if loss > 0 { lossCorr = Percentage2u32(nattrs.LossCorr) } if duplicate > 0 { duplicateCorr = Percentage2u32(nattrs.DuplicateCorr) } // FIXME should validate values(like loss/duplicate are percentages...) latency = time2Tick(latency) if nattrs.Limit != 0 { limit = nattrs.Limit } // Jitter is only value if latency is > 0 if latency > 0 { jitter = time2Tick(jitter) } reorderProb = Percentage2u32(nattrs.ReorderProb) reorderCorr = Percentage2u32(nattrs.ReorderCorr) if reorderProb > 0 { // ERROR if lantency == 0 if gap == 0 { gap = 1 } } corruptProb = Percentage2u32(nattrs.CorruptProb) corruptCorr = Percentage2u32(nattrs.CorruptCorr) return &Netem{ QdiscAttrs: attrs, Latency: latency, DelayCorr: delayCorr, Limit: limit, Loss: loss, LossCorr: lossCorr, Gap: gap, Duplicate: duplicate, DuplicateCorr: duplicateCorr, Jitter: jitter, ReorderProb: reorderProb, ReorderCorr: reorderCorr, CorruptProb: corruptProb, CorruptCorr: corruptCorr, } } // QdiscDel will delete a qdisc from the system. // Equivalent to: `tc qdisc del $qdisc` func QdiscDel(qdisc Qdisc) error { return pkgHandle.QdiscDel(qdisc) } // QdiscDel will delete a qdisc from the system. // Equivalent to: `tc qdisc del $qdisc` func (h *Handle) QdiscDel(qdisc Qdisc) error { return h.qdiscModify(syscall.RTM_DELQDISC, 0, qdisc) } // QdiscChange will change a qdisc in place // Equivalent to: `tc qdisc change $qdisc` // The parent and handle MUST NOT be changed. func QdiscChange(qdisc Qdisc) error { return pkgHandle.QdiscChange(qdisc) } // QdiscChange will change a qdisc in place // Equivalent to: `tc qdisc change $qdisc` // The parent and handle MUST NOT be changed. func (h *Handle) QdiscChange(qdisc Qdisc) error { return h.qdiscModify(syscall.RTM_NEWQDISC, 0, qdisc) } // QdiscReplace will replace a qdisc to the system. // Equivalent to: `tc qdisc replace $qdisc` // The handle MUST change. func QdiscReplace(qdisc Qdisc) error { return pkgHandle.QdiscReplace(qdisc) } // QdiscReplace will replace a qdisc to the system. // Equivalent to: `tc qdisc replace $qdisc` // The handle MUST change. func (h *Handle) QdiscReplace(qdisc Qdisc) error { return h.qdiscModify( syscall.RTM_NEWQDISC, syscall.NLM_F_CREATE|syscall.NLM_F_REPLACE, qdisc) } // QdiscAdd will add a qdisc to the system. // Equivalent to: `tc qdisc add $qdisc` func QdiscAdd(qdisc Qdisc) error { return pkgHandle.QdiscAdd(qdisc) } // QdiscAdd will add a qdisc to the system. // Equivalent to: `tc qdisc add $qdisc` func (h *Handle) QdiscAdd(qdisc Qdisc) error { return h.qdiscModify( syscall.RTM_NEWQDISC, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL, qdisc) } func (h *Handle) qdiscModify(cmd, flags int, qdisc Qdisc) error { req := h.newNetlinkRequest(cmd, flags|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) // When deleting don't bother building the rest of the netlink payload if cmd != syscall.RTM_DELQDISC { if err := qdiscPayload(req, qdisc); err != nil { return err } } _, err := req.Execute(syscall.NETLINK_ROUTE, 0) return err } func qdiscPayload(req *nl.NetlinkRequest, qdisc Qdisc) error { req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(qdisc.Type()))) options := nl.NewRtAttr(nl.TCA_OPTIONS, nil) switch qdisc := qdisc.(type) { case *Prio: tcmap := nl.TcPrioMap{ Bands: int32(qdisc.Bands), Priomap: qdisc.PriorityMap, } options = nl.NewRtAttr(nl.TCA_OPTIONS, tcmap.Serialize()) case *Tbf: opt := nl.TcTbfQopt{} opt.Rate.Rate = uint32(qdisc.Rate) opt.Peakrate.Rate = uint32(qdisc.Peakrate) opt.Limit = qdisc.Limit opt.Buffer = qdisc.Buffer nl.NewRtAttrChild(options, nl.TCA_TBF_PARMS, opt.Serialize()) if qdisc.Rate >= uint64(1<<32) { nl.NewRtAttrChild(options, nl.TCA_TBF_RATE64, nl.Uint64Attr(qdisc.Rate)) } if qdisc.Peakrate >= uint64(1<<32) { nl.NewRtAttrChild(options, nl.TCA_TBF_PRATE64, nl.Uint64Attr(qdisc.Peakrate)) } if qdisc.Peakrate > 0 { nl.NewRtAttrChild(options, nl.TCA_TBF_PBURST, nl.Uint32Attr(qdisc.Minburst)) } case *Htb: opt := nl.TcHtbGlob{} opt.Version = qdisc.Version opt.Rate2Quantum = qdisc.Rate2Quantum opt.Defcls = qdisc.Defcls // TODO: Handle Debug properly. For now default to 0 opt.Debug = qdisc.Debug opt.DirectPkts = qdisc.DirectPkts nl.NewRtAttrChild(options, nl.TCA_HTB_INIT, opt.Serialize()) // nl.NewRtAttrChild(options, nl.TCA_HTB_DIRECT_QLEN, opt.Serialize()) case *Netem: opt := nl.TcNetemQopt{} opt.Latency = qdisc.Latency opt.Limit = qdisc.Limit opt.Loss = qdisc.Loss opt.Gap = qdisc.Gap opt.Duplicate = qdisc.Duplicate opt.Jitter = qdisc.Jitter options = nl.NewRtAttr(nl.TCA_OPTIONS, opt.Serialize()) // Correlation corr := nl.TcNetemCorr{} corr.DelayCorr = qdisc.DelayCorr corr.LossCorr = qdisc.LossCorr corr.DupCorr = qdisc.DuplicateCorr if corr.DelayCorr > 0 || corr.LossCorr > 0 || corr.DupCorr > 0 { nl.NewRtAttrChild(options, nl.TCA_NETEM_CORR, corr.Serialize()) } // Corruption corruption := nl.TcNetemCorrupt{} corruption.Probability = qdisc.CorruptProb corruption.Correlation = qdisc.CorruptCorr if corruption.Probability > 0 { nl.NewRtAttrChild(options, nl.TCA_NETEM_CORRUPT, corruption.Serialize()) } // Reorder reorder := nl.TcNetemReorder{} reorder.Probability = qdisc.ReorderProb reorder.Correlation = qdisc.ReorderCorr if reorder.Probability > 0 { nl.NewRtAttrChild(options, nl.TCA_NETEM_REORDER, reorder.Serialize()) } case *Ingress: // ingress filters must use the proper handle if qdisc.Attrs().Parent != HANDLE_INGRESS { return fmt.Errorf("Ingress filters must set Parent to HANDLE_INGRESS") } } req.AddData(options) return nil } // QdiscList gets a list of qdiscs in the system. // Equivalent to: `tc qdisc show`. // The list can be filtered by link. func QdiscList(link Link) ([]Qdisc, error) { return pkgHandle.QdiscList(link) } // QdiscList gets a list of qdiscs in the system. // Equivalent to: `tc qdisc show`. // The list can be filtered by link. func (h *Handle) QdiscList(link Link) ([]Qdisc, error) { req := h.newNetlinkRequest(syscall.RTM_GETQDISC, syscall.NLM_F_DUMP) index := int32(0) if link != nil { base := link.Attrs() h.ensureIndex(base) index = int32(base.Index) } msg := &nl.TcMsg{ Family: nl.FAMILY_ALL, Ifindex: index, } req.AddData(msg) msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWQDISC) if err != nil { return nil, err } var res []Qdisc for _, m := range msgs { msg := nl.DeserializeTcMsg(m) attrs, err := nl.ParseRouteAttr(m[msg.Len():]) if err != nil { return nil, err } // skip qdiscs from other interfaces if link != nil && msg.Ifindex != index { continue } base := QdiscAttrs{ LinkIndex: int(msg.Ifindex), Handle: msg.Handle, Parent: msg.Parent, Refcnt: msg.Info, } var qdisc Qdisc qdiscType := "" for _, attr := range attrs { switch attr.Attr.Type { case nl.TCA_KIND: qdiscType = string(attr.Value[:len(attr.Value)-1]) switch qdiscType { case "pfifo_fast": qdisc = &PfifoFast{} case "prio": qdisc = &Prio{} case "tbf": qdisc = &Tbf{} case "ingress": qdisc = &Ingress{} case "htb": qdisc = &Htb{} case "netem": qdisc = &Netem{} default: qdisc = &GenericQdisc{QdiscType: qdiscType} } case nl.TCA_OPTIONS: switch qdiscType { case "pfifo_fast": // pfifo returns TcPrioMap directly without wrapping it in rtattr if err := parsePfifoFastData(qdisc, attr.Value); err != nil { return nil, err } case "prio": // prio returns TcPrioMap directly without wrapping it in rtattr if err := parsePrioData(qdisc, attr.Value); err != nil { return nil, err } case "tbf": data, err := nl.ParseRouteAttr(attr.Value) if err != nil { return nil, err } if err := parseTbfData(qdisc, data); err != nil { return nil, err } case "htb": data, err := nl.ParseRouteAttr(attr.Value) if err != nil { return nil, err } if err := parseHtbData(qdisc, data); err != nil { return nil, err } case "netem": if err := parseNetemData(qdisc, attr.Value); err != nil { return nil, err } // no options for ingress } } } *qdisc.Attrs() = base res = append(res, qdisc) } return res, nil } func parsePfifoFastData(qdisc Qdisc, value []byte) error { pfifo := qdisc.(*PfifoFast) tcmap := nl.DeserializeTcPrioMap(value) pfifo.PriorityMap = tcmap.Priomap pfifo.Bands = uint8(tcmap.Bands) return nil } func parsePrioData(qdisc Qdisc, value []byte) error { prio := qdisc.(*Prio) tcmap := nl.DeserializeTcPrioMap(value) prio.PriorityMap = tcmap.Priomap prio.Bands = uint8(tcmap.Bands) return nil } func parseHtbData(qdisc Qdisc, data []syscall.NetlinkRouteAttr) error { native = nl.NativeEndian() htb := qdisc.(*Htb) for _, datum := range data { switch datum.Attr.Type { case nl.TCA_HTB_INIT: opt := nl.DeserializeTcHtbGlob(datum.Value) htb.Version = opt.Version htb.Rate2Quantum = opt.Rate2Quantum htb.Defcls = opt.Defcls htb.Debug = opt.Debug htb.DirectPkts = opt.DirectPkts case nl.TCA_HTB_DIRECT_QLEN: // TODO //htb.DirectQlen = native.uint32(datum.Value) } } return nil } func parseNetemData(qdisc Qdisc, value []byte) error { netem := qdisc.(*Netem) opt := nl.DeserializeTcNetemQopt(value) netem.Latency = opt.Latency netem.Limit = opt.Limit netem.Loss = opt.Loss netem.Gap = opt.Gap netem.Duplicate = opt.Duplicate netem.Jitter = opt.Jitter data, err := nl.ParseRouteAttr(value[nl.SizeofTcNetemQopt:]) if err != nil { return err } for _, datum := range data { switch datum.Attr.Type { case nl.TCA_NETEM_CORR: opt := nl.DeserializeTcNetemCorr(datum.Value) netem.DelayCorr = opt.DelayCorr netem.LossCorr = opt.LossCorr netem.DuplicateCorr = opt.DupCorr case nl.TCA_NETEM_CORRUPT: opt := nl.DeserializeTcNetemCorrupt(datum.Value) netem.CorruptProb = opt.Probability netem.CorruptCorr = opt.Correlation case nl.TCA_NETEM_REORDER: opt := nl.DeserializeTcNetemReorder(datum.Value) netem.ReorderProb = opt.Probability netem.ReorderCorr = opt.Correlation } } return nil } func parseTbfData(qdisc Qdisc, data []syscall.NetlinkRouteAttr) error { native = nl.NativeEndian() tbf := qdisc.(*Tbf) for _, datum := range data { switch datum.Attr.Type { case nl.TCA_TBF_PARMS: opt := nl.DeserializeTcTbfQopt(datum.Value) tbf.Rate = uint64(opt.Rate.Rate) tbf.Peakrate = uint64(opt.Peakrate.Rate) tbf.Limit = opt.Limit tbf.Buffer = opt.Buffer case nl.TCA_TBF_RATE64: tbf.Rate = native.Uint64(datum.Value[0:8]) case nl.TCA_TBF_PRATE64: tbf.Peakrate = native.Uint64(datum.Value[0:8]) case nl.TCA_TBF_PBURST: tbf.Minburst = native.Uint32(datum.Value[0:4]) } } return nil } const ( TIME_UNITS_PER_SEC = 1000000 ) var ( tickInUsec float64 clockFactor float64 hz float64 ) func initClock() { data, err := ioutil.ReadFile("/proc/net/psched") if err != nil { return } parts := strings.Split(strings.TrimSpace(string(data)), " ") if len(parts) < 3 { return } var vals [3]uint64 for i := range vals { val, err := strconv.ParseUint(parts[i], 16, 32) if err != nil { return } vals[i] = val } // compatibility if vals[2] == 1000000000 { vals[0] = vals[1] } clockFactor = float64(vals[2]) / TIME_UNITS_PER_SEC tickInUsec = float64(vals[0]) / float64(vals[1]) * clockFactor hz = float64(vals[0]) } func TickInUsec() float64 { if tickInUsec == 0.0 { initClock() } return tickInUsec } func ClockFactor() float64 { if clockFactor == 0.0 { initClock() } return clockFactor } func Hz() float64 { if hz == 0.0 { initClock() } return hz } func time2Tick(time uint32) uint32 { return uint32(float64(time) * TickInUsec()) } func tick2Time(tick uint32) uint32 { return uint32(float64(tick) / TickInUsec()) } func time2Ktime(time uint32) uint32 { return uint32(float64(time) * ClockFactor()) } func ktime2Time(ktime uint32) uint32 { return uint32(float64(ktime) / ClockFactor()) } func burst(rate uint64, buffer uint32) uint32 { return uint32(float64(rate) * float64(tick2Time(buffer)) / TIME_UNITS_PER_SEC) } func latency(rate uint64, limit, buffer uint32) float64 { return TIME_UNITS_PER_SEC*(float64(limit)/float64(rate)) - float64(tick2Time(buffer)) } func Xmittime(rate uint64, size uint32) float64 { return TickInUsec() * TIME_UNITS_PER_SEC * (float64(size) / float64(rate)) }