mirror of https://github.com/vishvananda/netlink
653 lines
17 KiB
Go
653 lines
17 KiB
Go
package netlink
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"errors"
|
|
"fmt"
|
|
"syscall"
|
|
"unsafe"
|
|
|
|
"github.com/vishvananda/netlink/nl"
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
// Constants used in TcU32Sel.Flags.
|
|
const (
|
|
TC_U32_TERMINAL = nl.TC_U32_TERMINAL
|
|
TC_U32_OFFSET = nl.TC_U32_OFFSET
|
|
TC_U32_VAROFFSET = nl.TC_U32_VAROFFSET
|
|
TC_U32_EAT = nl.TC_U32_EAT
|
|
)
|
|
|
|
// Fw filter filters on firewall marks
|
|
// NOTE: this is in filter_linux because it refers to nl.TcPolice which
|
|
// is defined in nl/tc_linux.go
|
|
type Fw struct {
|
|
FilterAttrs
|
|
ClassId uint32
|
|
// TODO remove nl type from interface
|
|
Police nl.TcPolice
|
|
InDev string
|
|
// TODO Action
|
|
Mask uint32
|
|
AvRate uint32
|
|
Rtab [256]uint32
|
|
Ptab [256]uint32
|
|
}
|
|
|
|
func NewFw(attrs FilterAttrs, fattrs FilterFwAttrs) (*Fw, error) {
|
|
var rtab [256]uint32
|
|
var ptab [256]uint32
|
|
rcellLog := -1
|
|
pcellLog := -1
|
|
avrate := fattrs.AvRate / 8
|
|
police := nl.TcPolice{}
|
|
police.Rate.Rate = fattrs.Rate / 8
|
|
police.PeakRate.Rate = fattrs.PeakRate / 8
|
|
buffer := fattrs.Buffer
|
|
linklayer := nl.LINKLAYER_ETHERNET
|
|
|
|
if fattrs.LinkLayer != nl.LINKLAYER_UNSPEC {
|
|
linklayer = fattrs.LinkLayer
|
|
}
|
|
|
|
police.Action = int32(fattrs.Action)
|
|
if police.Rate.Rate != 0 {
|
|
police.Rate.Mpu = fattrs.Mpu
|
|
police.Rate.Overhead = fattrs.Overhead
|
|
if CalcRtable(&police.Rate, rtab[:], rcellLog, fattrs.Mtu, linklayer) < 0 {
|
|
return nil, errors.New("TBF: failed to calculate rate table")
|
|
}
|
|
police.Burst = uint32(Xmittime(uint64(police.Rate.Rate), uint32(buffer)))
|
|
}
|
|
police.Mtu = fattrs.Mtu
|
|
if police.PeakRate.Rate != 0 {
|
|
police.PeakRate.Mpu = fattrs.Mpu
|
|
police.PeakRate.Overhead = fattrs.Overhead
|
|
if CalcRtable(&police.PeakRate, ptab[:], pcellLog, fattrs.Mtu, linklayer) < 0 {
|
|
return nil, errors.New("POLICE: failed to calculate peak rate table")
|
|
}
|
|
}
|
|
|
|
return &Fw{
|
|
FilterAttrs: attrs,
|
|
ClassId: fattrs.ClassId,
|
|
InDev: fattrs.InDev,
|
|
Mask: fattrs.Mask,
|
|
Police: police,
|
|
AvRate: avrate,
|
|
Rtab: rtab,
|
|
Ptab: ptab,
|
|
}, nil
|
|
}
|
|
|
|
func (filter *Fw) Attrs() *FilterAttrs {
|
|
return &filter.FilterAttrs
|
|
}
|
|
|
|
func (filter *Fw) Type() string {
|
|
return "fw"
|
|
}
|
|
|
|
// FilterDel will delete a filter from the system.
|
|
// Equivalent to: `tc filter del $filter`
|
|
func FilterDel(filter Filter) error {
|
|
return pkgHandle.FilterDel(filter)
|
|
}
|
|
|
|
// FilterDel will delete a filter from the system.
|
|
// Equivalent to: `tc filter del $filter`
|
|
func (h *Handle) FilterDel(filter Filter) error {
|
|
req := h.newNetlinkRequest(unix.RTM_DELTFILTER, unix.NLM_F_ACK)
|
|
base := filter.Attrs()
|
|
msg := &nl.TcMsg{
|
|
Family: nl.FAMILY_ALL,
|
|
Ifindex: int32(base.LinkIndex),
|
|
Handle: base.Handle,
|
|
Parent: base.Parent,
|
|
Info: MakeHandle(base.Priority, nl.Swap16(base.Protocol)),
|
|
}
|
|
req.AddData(msg)
|
|
|
|
_, err := req.Execute(unix.NETLINK_ROUTE, 0)
|
|
return err
|
|
}
|
|
|
|
// FilterAdd will add a filter to the system.
|
|
// Equivalent to: `tc filter add $filter`
|
|
func FilterAdd(filter Filter) error {
|
|
return pkgHandle.FilterAdd(filter)
|
|
}
|
|
|
|
// FilterAdd will add a filter to the system.
|
|
// Equivalent to: `tc filter add $filter`
|
|
func (h *Handle) FilterAdd(filter Filter) error {
|
|
native = nl.NativeEndian()
|
|
req := h.newNetlinkRequest(unix.RTM_NEWTFILTER, unix.NLM_F_CREATE|unix.NLM_F_EXCL|unix.NLM_F_ACK)
|
|
base := filter.Attrs()
|
|
msg := &nl.TcMsg{
|
|
Family: nl.FAMILY_ALL,
|
|
Ifindex: int32(base.LinkIndex),
|
|
Handle: base.Handle,
|
|
Parent: base.Parent,
|
|
Info: MakeHandle(base.Priority, nl.Swap16(base.Protocol)),
|
|
}
|
|
req.AddData(msg)
|
|
req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(filter.Type())))
|
|
|
|
options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
|
|
|
|
switch filter := filter.(type) {
|
|
case *U32:
|
|
// Convert TcU32Sel into nl.TcU32Sel as it is without copy.
|
|
sel := (*nl.TcU32Sel)(unsafe.Pointer(filter.Sel))
|
|
if sel == nil {
|
|
// match all
|
|
sel = &nl.TcU32Sel{
|
|
Nkeys: 1,
|
|
Flags: nl.TC_U32_TERMINAL,
|
|
}
|
|
sel.Keys = append(sel.Keys, nl.TcU32Key{})
|
|
}
|
|
|
|
if native != networkOrder {
|
|
// Copy TcU32Sel.
|
|
cSel := *sel
|
|
keys := make([]nl.TcU32Key, cap(sel.Keys))
|
|
copy(keys, sel.Keys)
|
|
cSel.Keys = keys
|
|
sel = &cSel
|
|
|
|
// Handle the endianness of attributes
|
|
sel.Offmask = native.Uint16(htons(sel.Offmask))
|
|
sel.Hmask = native.Uint32(htonl(sel.Hmask))
|
|
for i, key := range sel.Keys {
|
|
sel.Keys[i].Mask = native.Uint32(htonl(key.Mask))
|
|
sel.Keys[i].Val = native.Uint32(htonl(key.Val))
|
|
}
|
|
}
|
|
sel.Nkeys = uint8(len(sel.Keys))
|
|
options.AddRtAttr(nl.TCA_U32_SEL, sel.Serialize())
|
|
if filter.ClassId != 0 {
|
|
options.AddRtAttr(nl.TCA_U32_CLASSID, nl.Uint32Attr(filter.ClassId))
|
|
}
|
|
if filter.Divisor != 0 {
|
|
if (filter.Divisor-1)&filter.Divisor != 0 {
|
|
return fmt.Errorf("illegal divisor %d. Must be a power of 2.", filter.Divisor)
|
|
}
|
|
options.AddRtAttr(nl.TCA_U32_DIVISOR, nl.Uint32Attr(filter.Divisor))
|
|
}
|
|
if filter.Hash != 0 {
|
|
options.AddRtAttr(nl.TCA_U32_HASH, nl.Uint32Attr(filter.Hash))
|
|
}
|
|
actionsAttr := options.AddRtAttr(nl.TCA_U32_ACT, nil)
|
|
// backwards compatibility
|
|
if filter.RedirIndex != 0 {
|
|
filter.Actions = append([]Action{NewMirredAction(filter.RedirIndex)}, filter.Actions...)
|
|
}
|
|
if err := EncodeActions(actionsAttr, filter.Actions); err != nil {
|
|
return err
|
|
}
|
|
case *Fw:
|
|
if filter.Mask != 0 {
|
|
b := make([]byte, 4)
|
|
native.PutUint32(b, filter.Mask)
|
|
options.AddRtAttr(nl.TCA_FW_MASK, b)
|
|
}
|
|
if filter.InDev != "" {
|
|
options.AddRtAttr(nl.TCA_FW_INDEV, nl.ZeroTerminated(filter.InDev))
|
|
}
|
|
if (filter.Police != nl.TcPolice{}) {
|
|
|
|
police := options.AddRtAttr(nl.TCA_FW_POLICE, nil)
|
|
police.AddRtAttr(nl.TCA_POLICE_TBF, filter.Police.Serialize())
|
|
if (filter.Police.Rate != nl.TcRateSpec{}) {
|
|
payload := SerializeRtab(filter.Rtab)
|
|
police.AddRtAttr(nl.TCA_POLICE_RATE, payload)
|
|
}
|
|
if (filter.Police.PeakRate != nl.TcRateSpec{}) {
|
|
payload := SerializeRtab(filter.Ptab)
|
|
police.AddRtAttr(nl.TCA_POLICE_PEAKRATE, payload)
|
|
}
|
|
}
|
|
if filter.ClassId != 0 {
|
|
b := make([]byte, 4)
|
|
native.PutUint32(b, filter.ClassId)
|
|
options.AddRtAttr(nl.TCA_FW_CLASSID, b)
|
|
}
|
|
case *BpfFilter:
|
|
var bpfFlags uint32
|
|
if filter.ClassId != 0 {
|
|
options.AddRtAttr(nl.TCA_BPF_CLASSID, nl.Uint32Attr(filter.ClassId))
|
|
}
|
|
if filter.Fd >= 0 {
|
|
options.AddRtAttr(nl.TCA_BPF_FD, nl.Uint32Attr((uint32(filter.Fd))))
|
|
}
|
|
if filter.Name != "" {
|
|
options.AddRtAttr(nl.TCA_BPF_NAME, nl.ZeroTerminated(filter.Name))
|
|
}
|
|
if filter.DirectAction {
|
|
bpfFlags |= nl.TCA_BPF_FLAG_ACT_DIRECT
|
|
}
|
|
options.AddRtAttr(nl.TCA_BPF_FLAGS, nl.Uint32Attr(bpfFlags))
|
|
case *MatchAll:
|
|
actionsAttr := options.AddRtAttr(nl.TCA_MATCHALL_ACT, nil)
|
|
if err := EncodeActions(actionsAttr, filter.Actions); err != nil {
|
|
return err
|
|
}
|
|
if filter.ClassId != 0 {
|
|
options.AddRtAttr(nl.TCA_MATCHALL_CLASSID, nl.Uint32Attr(filter.ClassId))
|
|
}
|
|
}
|
|
|
|
req.AddData(options)
|
|
_, err := req.Execute(unix.NETLINK_ROUTE, 0)
|
|
return err
|
|
}
|
|
|
|
// FilterList gets a list of filters in the system.
|
|
// Equivalent to: `tc filter show`.
|
|
// Generally returns nothing if link and parent are not specified.
|
|
func FilterList(link Link, parent uint32) ([]Filter, error) {
|
|
return pkgHandle.FilterList(link, parent)
|
|
}
|
|
|
|
// FilterList gets a list of filters in the system.
|
|
// Equivalent to: `tc filter show`.
|
|
// Generally returns nothing if link and parent are not specified.
|
|
func (h *Handle) FilterList(link Link, parent uint32) ([]Filter, error) {
|
|
req := h.newNetlinkRequest(unix.RTM_GETTFILTER, unix.NLM_F_DUMP)
|
|
msg := &nl.TcMsg{
|
|
Family: nl.FAMILY_ALL,
|
|
Parent: parent,
|
|
}
|
|
if link != nil {
|
|
base := link.Attrs()
|
|
h.ensureIndex(base)
|
|
msg.Ifindex = int32(base.Index)
|
|
}
|
|
req.AddData(msg)
|
|
|
|
msgs, err := req.Execute(unix.NETLINK_ROUTE, unix.RTM_NEWTFILTER)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var res []Filter
|
|
for _, m := range msgs {
|
|
msg := nl.DeserializeTcMsg(m)
|
|
|
|
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
base := FilterAttrs{
|
|
LinkIndex: int(msg.Ifindex),
|
|
Handle: msg.Handle,
|
|
Parent: msg.Parent,
|
|
}
|
|
base.Priority, base.Protocol = MajorMinor(msg.Info)
|
|
base.Protocol = nl.Swap16(base.Protocol)
|
|
|
|
var filter Filter
|
|
filterType := ""
|
|
detailed := false
|
|
for _, attr := range attrs {
|
|
switch attr.Attr.Type {
|
|
case nl.TCA_KIND:
|
|
filterType = string(attr.Value[:len(attr.Value)-1])
|
|
switch filterType {
|
|
case "u32":
|
|
filter = &U32{}
|
|
case "fw":
|
|
filter = &Fw{}
|
|
case "bpf":
|
|
filter = &BpfFilter{}
|
|
case "matchall":
|
|
filter = &MatchAll{}
|
|
default:
|
|
filter = &GenericFilter{FilterType: filterType}
|
|
}
|
|
case nl.TCA_OPTIONS:
|
|
data, err := nl.ParseRouteAttr(attr.Value)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
switch filterType {
|
|
case "u32":
|
|
detailed, err = parseU32Data(filter, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
case "fw":
|
|
detailed, err = parseFwData(filter, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
case "bpf":
|
|
detailed, err = parseBpfData(filter, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
case "matchall":
|
|
detailed, err = parseMatchAllData(filter, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
default:
|
|
detailed = true
|
|
}
|
|
}
|
|
}
|
|
// only return the detailed version of the filter
|
|
if detailed {
|
|
*filter.Attrs() = base
|
|
res = append(res, filter)
|
|
}
|
|
}
|
|
|
|
return res, nil
|
|
}
|
|
|
|
func toTcGen(attrs *ActionAttrs, tcgen *nl.TcGen) {
|
|
tcgen.Index = uint32(attrs.Index)
|
|
tcgen.Capab = uint32(attrs.Capab)
|
|
tcgen.Action = int32(attrs.Action)
|
|
tcgen.Refcnt = int32(attrs.Refcnt)
|
|
tcgen.Bindcnt = int32(attrs.Bindcnt)
|
|
}
|
|
|
|
func toAttrs(tcgen *nl.TcGen, attrs *ActionAttrs) {
|
|
attrs.Index = int(tcgen.Index)
|
|
attrs.Capab = int(tcgen.Capab)
|
|
attrs.Action = TcAct(tcgen.Action)
|
|
attrs.Refcnt = int(tcgen.Refcnt)
|
|
attrs.Bindcnt = int(tcgen.Bindcnt)
|
|
}
|
|
|
|
func EncodeActions(attr *nl.RtAttr, actions []Action) error {
|
|
tabIndex := int(nl.TCA_ACT_TAB)
|
|
|
|
for _, action := range actions {
|
|
switch action := action.(type) {
|
|
default:
|
|
return fmt.Errorf("unknown action type %s", action.Type())
|
|
case *MirredAction:
|
|
table := attr.AddRtAttr(tabIndex, nil)
|
|
tabIndex++
|
|
table.AddRtAttr(nl.TCA_ACT_KIND, nl.ZeroTerminated("mirred"))
|
|
aopts := table.AddRtAttr(nl.TCA_ACT_OPTIONS, nil)
|
|
mirred := nl.TcMirred{
|
|
Eaction: int32(action.MirredAction),
|
|
Ifindex: uint32(action.Ifindex),
|
|
}
|
|
toTcGen(action.Attrs(), &mirred.TcGen)
|
|
aopts.AddRtAttr(nl.TCA_MIRRED_PARMS, mirred.Serialize())
|
|
case *BpfAction:
|
|
table := attr.AddRtAttr(tabIndex, nil)
|
|
tabIndex++
|
|
table.AddRtAttr(nl.TCA_ACT_KIND, nl.ZeroTerminated("bpf"))
|
|
aopts := table.AddRtAttr(nl.TCA_ACT_OPTIONS, nil)
|
|
gen := nl.TcGen{}
|
|
toTcGen(action.Attrs(), &gen)
|
|
aopts.AddRtAttr(nl.TCA_ACT_BPF_PARMS, gen.Serialize())
|
|
aopts.AddRtAttr(nl.TCA_ACT_BPF_FD, nl.Uint32Attr(uint32(action.Fd)))
|
|
aopts.AddRtAttr(nl.TCA_ACT_BPF_NAME, nl.ZeroTerminated(action.Name))
|
|
case *GenericAction:
|
|
table := attr.AddRtAttr(tabIndex, nil)
|
|
tabIndex++
|
|
table.AddRtAttr(nl.TCA_ACT_KIND, nl.ZeroTerminated("gact"))
|
|
aopts := table.AddRtAttr(nl.TCA_ACT_OPTIONS, nil)
|
|
gen := nl.TcGen{}
|
|
toTcGen(action.Attrs(), &gen)
|
|
aopts.AddRtAttr(nl.TCA_GACT_PARMS, gen.Serialize())
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func parseActions(tables []syscall.NetlinkRouteAttr) ([]Action, error) {
|
|
var actions []Action
|
|
for _, table := range tables {
|
|
var action Action
|
|
var actionType string
|
|
aattrs, err := nl.ParseRouteAttr(table.Value)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
nextattr:
|
|
for _, aattr := range aattrs {
|
|
switch aattr.Attr.Type {
|
|
case nl.TCA_KIND:
|
|
actionType = string(aattr.Value[:len(aattr.Value)-1])
|
|
// only parse if the action is mirred or bpf
|
|
switch actionType {
|
|
case "mirred":
|
|
action = &MirredAction{}
|
|
case "bpf":
|
|
action = &BpfAction{}
|
|
case "gact":
|
|
action = &GenericAction{}
|
|
default:
|
|
break nextattr
|
|
}
|
|
case nl.TCA_OPTIONS:
|
|
adata, err := nl.ParseRouteAttr(aattr.Value)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, adatum := range adata {
|
|
switch actionType {
|
|
case "mirred":
|
|
switch adatum.Attr.Type {
|
|
case nl.TCA_MIRRED_PARMS:
|
|
mirred := *nl.DeserializeTcMirred(adatum.Value)
|
|
toAttrs(&mirred.TcGen, action.Attrs())
|
|
action.(*MirredAction).ActionAttrs = ActionAttrs{}
|
|
action.(*MirredAction).Ifindex = int(mirred.Ifindex)
|
|
action.(*MirredAction).MirredAction = MirredAct(mirred.Eaction)
|
|
}
|
|
case "bpf":
|
|
switch adatum.Attr.Type {
|
|
case nl.TCA_ACT_BPF_PARMS:
|
|
gen := *nl.DeserializeTcGen(adatum.Value)
|
|
toAttrs(&gen, action.Attrs())
|
|
case nl.TCA_ACT_BPF_FD:
|
|
action.(*BpfAction).Fd = int(native.Uint32(adatum.Value[0:4]))
|
|
case nl.TCA_ACT_BPF_NAME:
|
|
action.(*BpfAction).Name = string(adatum.Value[:len(adatum.Value)-1])
|
|
}
|
|
case "gact":
|
|
switch adatum.Attr.Type {
|
|
case nl.TCA_GACT_PARMS:
|
|
gen := *nl.DeserializeTcGen(adatum.Value)
|
|
toAttrs(&gen, action.Attrs())
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
actions = append(actions, action)
|
|
}
|
|
return actions, nil
|
|
}
|
|
|
|
func parseU32Data(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error) {
|
|
native = nl.NativeEndian()
|
|
u32 := filter.(*U32)
|
|
detailed := false
|
|
for _, datum := range data {
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_U32_SEL:
|
|
detailed = true
|
|
sel := nl.DeserializeTcU32Sel(datum.Value)
|
|
u32.Sel = (*TcU32Sel)(unsafe.Pointer(sel))
|
|
if native != networkOrder {
|
|
// Handle the endianness of attributes
|
|
u32.Sel.Offmask = native.Uint16(htons(sel.Offmask))
|
|
u32.Sel.Hmask = native.Uint32(htonl(sel.Hmask))
|
|
for i, key := range u32.Sel.Keys {
|
|
u32.Sel.Keys[i].Mask = native.Uint32(htonl(key.Mask))
|
|
u32.Sel.Keys[i].Val = native.Uint32(htonl(key.Val))
|
|
}
|
|
}
|
|
case nl.TCA_U32_ACT:
|
|
tables, err := nl.ParseRouteAttr(datum.Value)
|
|
if err != nil {
|
|
return detailed, err
|
|
}
|
|
u32.Actions, err = parseActions(tables)
|
|
if err != nil {
|
|
return detailed, err
|
|
}
|
|
for _, action := range u32.Actions {
|
|
if action, ok := action.(*MirredAction); ok {
|
|
u32.RedirIndex = int(action.Ifindex)
|
|
}
|
|
}
|
|
case nl.TCA_U32_CLASSID:
|
|
u32.ClassId = native.Uint32(datum.Value)
|
|
case nl.TCA_U32_DIVISOR:
|
|
u32.Divisor = native.Uint32(datum.Value)
|
|
case nl.TCA_U32_HASH:
|
|
u32.Hash = native.Uint32(datum.Value)
|
|
}
|
|
}
|
|
return detailed, nil
|
|
}
|
|
|
|
func parseFwData(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error) {
|
|
native = nl.NativeEndian()
|
|
fw := filter.(*Fw)
|
|
detailed := true
|
|
for _, datum := range data {
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_FW_MASK:
|
|
fw.Mask = native.Uint32(datum.Value[0:4])
|
|
case nl.TCA_FW_CLASSID:
|
|
fw.ClassId = native.Uint32(datum.Value[0:4])
|
|
case nl.TCA_FW_INDEV:
|
|
fw.InDev = string(datum.Value[:len(datum.Value)-1])
|
|
case nl.TCA_FW_POLICE:
|
|
adata, _ := nl.ParseRouteAttr(datum.Value)
|
|
for _, aattr := range adata {
|
|
switch aattr.Attr.Type {
|
|
case nl.TCA_POLICE_TBF:
|
|
fw.Police = *nl.DeserializeTcPolice(aattr.Value)
|
|
case nl.TCA_POLICE_RATE:
|
|
fw.Rtab = DeserializeRtab(aattr.Value)
|
|
case nl.TCA_POLICE_PEAKRATE:
|
|
fw.Ptab = DeserializeRtab(aattr.Value)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return detailed, nil
|
|
}
|
|
|
|
func parseBpfData(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error) {
|
|
native = nl.NativeEndian()
|
|
bpf := filter.(*BpfFilter)
|
|
detailed := true
|
|
for _, datum := range data {
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_BPF_FD:
|
|
bpf.Fd = int(native.Uint32(datum.Value[0:4]))
|
|
case nl.TCA_BPF_NAME:
|
|
bpf.Name = string(datum.Value[:len(datum.Value)-1])
|
|
case nl.TCA_BPF_CLASSID:
|
|
bpf.ClassId = native.Uint32(datum.Value[0:4])
|
|
case nl.TCA_BPF_FLAGS:
|
|
flags := native.Uint32(datum.Value[0:4])
|
|
if (flags & nl.TCA_BPF_FLAG_ACT_DIRECT) != 0 {
|
|
bpf.DirectAction = true
|
|
}
|
|
}
|
|
}
|
|
return detailed, nil
|
|
}
|
|
|
|
func parseMatchAllData(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error) {
|
|
native = nl.NativeEndian()
|
|
matchall := filter.(*MatchAll)
|
|
detailed := true
|
|
for _, datum := range data {
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_MATCHALL_CLASSID:
|
|
matchall.ClassId = native.Uint32(datum.Value[0:4])
|
|
case nl.TCA_MATCHALL_ACT:
|
|
tables, err := nl.ParseRouteAttr(datum.Value)
|
|
if err != nil {
|
|
return detailed, err
|
|
}
|
|
matchall.Actions, err = parseActions(tables)
|
|
if err != nil {
|
|
return detailed, err
|
|
}
|
|
}
|
|
}
|
|
return detailed, nil
|
|
}
|
|
|
|
func AlignToAtm(size uint) uint {
|
|
var linksize, cells int
|
|
cells = int(size / nl.ATM_CELL_PAYLOAD)
|
|
if (size % nl.ATM_CELL_PAYLOAD) > 0 {
|
|
cells++
|
|
}
|
|
linksize = cells * nl.ATM_CELL_SIZE
|
|
return uint(linksize)
|
|
}
|
|
|
|
func AdjustSize(sz uint, mpu uint, linklayer int) uint {
|
|
if sz < mpu {
|
|
sz = mpu
|
|
}
|
|
switch linklayer {
|
|
case nl.LINKLAYER_ATM:
|
|
return AlignToAtm(sz)
|
|
default:
|
|
return sz
|
|
}
|
|
}
|
|
|
|
func CalcRtable(rate *nl.TcRateSpec, rtab []uint32, cellLog int, mtu uint32, linklayer int) int {
|
|
bps := rate.Rate
|
|
mpu := rate.Mpu
|
|
var sz uint
|
|
if mtu == 0 {
|
|
mtu = 2047
|
|
}
|
|
if cellLog < 0 {
|
|
cellLog = 0
|
|
for (mtu >> uint(cellLog)) > 255 {
|
|
cellLog++
|
|
}
|
|
}
|
|
for i := 0; i < 256; i++ {
|
|
sz = AdjustSize(uint((i+1)<<uint32(cellLog)), uint(mpu), linklayer)
|
|
rtab[i] = uint32(Xmittime(uint64(bps), uint32(sz)))
|
|
}
|
|
rate.CellAlign = -1
|
|
rate.CellLog = uint8(cellLog)
|
|
rate.Linklayer = uint8(linklayer & nl.TC_LINKLAYER_MASK)
|
|
return cellLog
|
|
}
|
|
|
|
func DeserializeRtab(b []byte) [256]uint32 {
|
|
var rtab [256]uint32
|
|
native := nl.NativeEndian()
|
|
r := bytes.NewReader(b)
|
|
_ = binary.Read(r, native, &rtab)
|
|
return rtab
|
|
}
|
|
|
|
func SerializeRtab(rtab [256]uint32) []byte {
|
|
native := nl.NativeEndian()
|
|
var w bytes.Buffer
|
|
_ = binary.Write(&w, native, rtab)
|
|
return w.Bytes()
|
|
}
|