package netlink
import (
"fmt"
"math"
)
const (
HANDLE_NONE = 0
HANDLE_INGRESS = 0xFFFFFFF1
HANDLE_CLSACT = HANDLE_INGRESS
HANDLE_ROOT = 0xFFFFFFFF
PRIORITY_MAP_LEN = 16
)
const (
HANDLE_MIN_INGRESS = 0xFFFFFFF2
HANDLE_MIN_EGRESS = 0xFFFFFFF3
)
const (
HORIZON_DROP_POLICY_CAP = 0
HORIZON_DROP_POLICY_DROP = 1
HORIZON_DROP_POLICY_DEFAULT = 255
)
type Qdisc interface {
Attrs() *QdiscAttrs
Type() string
}
type QdiscStatistics ClassStatistics
// QdiscAttrs represents a netlink qdisc. A qdisc is associated with a link,
// has a handle, a parent and a refcnt. The root qdisc of a device should
// have parent == HANDLE_ROOT.
type QdiscAttrs struct {
LinkIndex int
Handle uint32
Parent uint32
Refcnt uint32 // read only
IngressBlock *uint32
Statistics *QdiscStatistics
}
func (q QdiscAttrs) String() string {
return fmt.Sprintf("{LinkIndex: %d, Handle: %s, Parent: %s, Refcnt: %d}", q.LinkIndex, HandleStr(q.Handle), HandleStr(q.Parent), q.Refcnt)
}
func MakeHandle(major, minor uint16) uint32 {
return (uint32(major) << 16) | uint32(minor)
}
func MajorMinor(handle uint32) (uint16, uint16) {
return uint16((handle & 0xFFFF0000) >> 16), uint16(handle & 0x0000FFFFF)
}
func HandleStr(handle uint32) string {
switch handle {
case HANDLE_NONE:
return "none"
case HANDLE_INGRESS:
return "ingress"
case HANDLE_ROOT:
return "root"
default:
major, minor := MajorMinor(handle)
return fmt.Sprintf("%x:%x", major, minor)
}
}
func Percentage2u32(percentage float32) uint32 {
// FIXME this is most likely not the best way to convert from % to uint32
if percentage == 100 {
return math.MaxUint32
}
return uint32(math.MaxUint32 * (percentage / 100))
}
// PfifoFast is the default qdisc created by the kernel if one has not
// been defined for the interface
type PfifoFast struct {
QdiscAttrs
Bands uint8
PriorityMap [PRIORITY_MAP_LEN]uint8
}
func (qdisc *PfifoFast) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *PfifoFast) Type() string {
return "pfifo_fast"
}
// Prio is a basic qdisc that works just like PfifoFast
type Prio struct {
QdiscAttrs
Bands uint8
PriorityMap [PRIORITY_MAP_LEN]uint8
}
func NewPrio(attrs QdiscAttrs) *Prio {
return &Prio{
QdiscAttrs: attrs,
Bands: 3,
PriorityMap: [PRIORITY_MAP_LEN]uint8{1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1},
}
}
func (qdisc *Prio) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *Prio) Type() string {
return "prio"
}
// Htb is a classful qdisc that rate limits based on tokens
type Htb struct {
QdiscAttrs
Version uint32
Rate2Quantum uint32
Defcls uint32
Debug uint32
DirectPkts uint32
DirectQlen *uint32
}
func NewHtb(attrs QdiscAttrs) *Htb {
return &Htb{
QdiscAttrs: attrs,
Version: 3,
Defcls: 0,
Rate2Quantum: 10,
Debug: 0,
DirectPkts: 0,
DirectQlen: nil,
}
}
func (qdisc *Htb) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *Htb) Type() string {
return "htb"
}
// Netem is a classless qdisc that rate limits based on tokens
type NetemQdiscAttrs struct {
Latency uint32 // in us
DelayCorr float32 // in %
Limit uint32
Loss float32 // in %
LossCorr float32 // in %
Gap uint32
Duplicate float32 // in %
DuplicateCorr float32 // in %
Jitter uint32 // in us
ReorderProb float32 // in %
ReorderCorr float32 // in %
CorruptProb float32 // in %
CorruptCorr float32 // in %
Rate64 uint64
}
func (q NetemQdiscAttrs) String() string {
return fmt.Sprintf(
"{Latency: %d, Limit: %d, Loss: %f, Gap: %d, Duplicate: %f, Jitter: %d}",
q.Latency, q.Limit, q.Loss, q.Gap, q.Duplicate, q.Jitter,
)
}
type Netem struct {
QdiscAttrs
Latency uint32
DelayCorr uint32
Limit uint32
Loss uint32
LossCorr uint32
Gap uint32
Duplicate uint32
DuplicateCorr uint32
Jitter uint32
ReorderProb uint32
ReorderCorr uint32
CorruptProb uint32
CorruptCorr uint32
Rate64 uint64
}
func (netem *Netem) String() string {
return fmt.Sprintf(
"{Latency: %v, Limit: %v, Loss: %v, Gap: %v, Duplicate: %v, Jitter: %v}",
netem.Latency, netem.Limit, netem.Loss, netem.Gap, netem.Duplicate, netem.Jitter,
)
}
func (qdisc *Netem) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *Netem) Type() string {
return "netem"
}
// Tbf is a classless qdisc that rate limits based on tokens
type Tbf struct {
QdiscAttrs
Rate uint64
Limit uint32
Buffer uint32
Peakrate uint64
Minburst uint32
// TODO: handle other settings
}
func (qdisc *Tbf) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *Tbf) Type() string {
return "tbf"
}
// Clsact is a qdisc for adding filters
type Clsact struct {
QdiscAttrs
}
func (qdisc *Clsact) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *Clsact) Type() string {
return "clsact"
}
// Ingress is a qdisc for adding ingress filters
type Ingress struct {
QdiscAttrs
}
func (qdisc *Ingress) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *Ingress) Type() string {
return "ingress"
}
// GenericQdisc qdiscs represent types that are not currently understood
// by this netlink library.
type GenericQdisc struct {
QdiscAttrs
QdiscType string
}
func (qdisc *GenericQdisc) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *GenericQdisc) Type() string {
return qdisc.QdiscType
}
type Hfsc struct {
QdiscAttrs
Defcls uint16
}
func NewHfsc(attrs QdiscAttrs) *Hfsc {
return &Hfsc{
QdiscAttrs: attrs,
Defcls: 1,
}
}
func (hfsc *Hfsc) Attrs() *QdiscAttrs {
return &hfsc.QdiscAttrs
}
func (hfsc *Hfsc) Type() string {
return "hfsc"
}
func (hfsc *Hfsc) String() string {
return fmt.Sprintf(
"{%v -- default: %d}",
hfsc.Attrs(), hfsc.Defcls,
)
}
// Fq is a classless packet scheduler meant to be mostly used for locally generated traffic.
type Fq struct {
QdiscAttrs
PacketLimit uint32
FlowPacketLimit uint32
// In bytes
Quantum uint32
InitialQuantum uint32
// called RateEnable under the hood
Pacing uint32
FlowDefaultRate uint32
FlowMaxRate uint32
// called BucketsLog under the hood
Buckets uint32
FlowRefillDelay uint32
LowRateThreshold uint32
Horizon uint32
HorizonDropPolicy uint8
}
func (fq *Fq) String() string {
return fmt.Sprintf(
"{PacketLimit: %v, FlowPacketLimit: %v, Quantum: %v, InitialQuantum: %v, Pacing: %v, FlowDefaultRate: %v, FlowMaxRate: %v, Buckets: %v, FlowRefillDelay: %v, LowRateThreshold: %v, Horizon: %v, HorizonDropPolicy: %v}",
fq.PacketLimit, fq.FlowPacketLimit, fq.Quantum, fq.InitialQuantum, fq.Pacing, fq.FlowDefaultRate, fq.FlowMaxRate, fq.Buckets, fq.FlowRefillDelay, fq.LowRateThreshold, fq.Horizon, fq.HorizonDropPolicy,
)
}
func NewFq(attrs QdiscAttrs) *Fq {
return &Fq{
QdiscAttrs: attrs,
Pacing: 1,
HorizonDropPolicy: HORIZON_DROP_POLICY_DEFAULT,
}
}
func (qdisc *Fq) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *Fq) Type() string {
return "fq"
}
// FQ_Codel (Fair Queuing Controlled Delay) is queuing discipline that combines Fair Queuing with the CoDel AQM scheme.
type FqCodel struct {
QdiscAttrs
Target uint32
Limit uint32
Interval uint32
ECN uint32
Flows uint32
Quantum uint32
CEThreshold uint32
DropBatchSize uint32
MemoryLimit uint32
}
func (fqcodel *FqCodel) String() string {
return fmt.Sprintf(
"{%v -- Target: %v, Limit: %v, Interval: %v, ECM: %v, Flows: %v, Quantum: %v}",
fqcodel.Attrs(), fqcodel.Target, fqcodel.Limit, fqcodel.Interval, fqcodel.ECN, fqcodel.Flows, fqcodel.Quantum,
)
}
func NewFqCodel(attrs QdiscAttrs) *FqCodel {
return &FqCodel{
QdiscAttrs: attrs,
ECN: 1,
}
}
func (qdisc *FqCodel) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *FqCodel) Type() string {
return "fq_codel"
}
type Sfq struct {
QdiscAttrs
// TODO: Only the simplified options for SFQ are handled here. Support for the extended one can be added later.
Quantum uint8
Perturb uint8
Limit uint32
Divisor uint8
}
func (sfq *Sfq) String() string {
return fmt.Sprintf(
"{%v -- Quantum: %v, Perturb: %v, Limit: %v, Divisor: %v}",
sfq.Attrs(), sfq.Quantum, sfq.Perturb, sfq.Limit, sfq.Divisor,
)
}
func (qdisc *Sfq) Attrs() *QdiscAttrs {
return &qdisc.QdiscAttrs
}
func (qdisc *Sfq) Type() string {
return "sfq"
}
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