mirror of
https://github.com/vishvananda/netlink
synced 2024-12-28 17:52:28 +00:00
323 lines
8.2 KiB
Go
323 lines
8.2 KiB
Go
package netlink
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"syscall"
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"github.com/vishvananda/netlink/nl"
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)
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// FilterDel will delete a filter from the system.
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// Equivalent to: `tc filter del $filter`
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func FilterDel(filter Filter) error {
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req := nl.NewNetlinkRequest(syscall.RTM_DELTFILTER, syscall.NLM_F_ACK)
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base := filter.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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Info: MakeHandle(base.Priority, nl.Swap16(base.Protocol)),
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}
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req.AddData(msg)
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_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
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return err
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}
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// FilterAdd will add a filter to the system.
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// Equivalent to: `tc filter add $filter`
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func FilterAdd(filter Filter) error {
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native = nl.NativeEndian()
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req := nl.NewNetlinkRequest(syscall.RTM_NEWTFILTER, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
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base := filter.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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Info: MakeHandle(base.Priority, nl.Swap16(base.Protocol)),
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}
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req.AddData(msg)
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req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(filter.Type())))
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options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
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if u32, ok := filter.(*U32); ok {
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// match all
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sel := nl.TcU32Sel{
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Nkeys: 1,
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Flags: nl.TC_U32_TERMINAL,
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}
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sel.Keys = append(sel.Keys, nl.TcU32Key{})
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nl.NewRtAttrChild(options, nl.TCA_U32_SEL, sel.Serialize())
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actions := nl.NewRtAttrChild(options, nl.TCA_U32_ACT, nil)
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table := nl.NewRtAttrChild(actions, nl.TCA_ACT_TAB, nil)
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nl.NewRtAttrChild(table, nl.TCA_KIND, nl.ZeroTerminated("mirred"))
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// redirect to other interface
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mir := nl.TcMirred{
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Action: nl.TC_ACT_STOLEN,
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Eaction: nl.TCA_EGRESS_REDIR,
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Ifindex: uint32(u32.RedirIndex),
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}
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aopts := nl.NewRtAttrChild(table, nl.TCA_OPTIONS, nil)
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nl.NewRtAttrChild(aopts, nl.TCA_MIRRED_PARMS, mir.Serialize())
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} else if fw, ok := filter.(*Fw); ok {
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if fw.Mask != 0 {
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b := make([]byte, 4)
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native.PutUint32(b, fw.Mask)
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nl.NewRtAttrChild(options, nl.TCA_FW_MASK, b)
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}
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if fw.InDev != "" {
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nl.NewRtAttrChild(options, nl.TCA_FW_INDEV, nl.ZeroTerminated(fw.InDev))
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}
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if (fw.Police != nl.TcPolice{}) {
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police := nl.NewRtAttrChild(options, nl.TCA_FW_POLICE, nil)
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nl.NewRtAttrChild(police, nl.TCA_POLICE_TBF, fw.Police.Serialize())
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if (fw.Police.Rate != nl.TcRateSpec{}) {
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payload := SerializeRtab(fw.Rtab)
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nl.NewRtAttrChild(police, nl.TCA_POLICE_RATE, payload)
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}
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if (fw.Police.PeakRate != nl.TcRateSpec{}) {
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payload := SerializeRtab(fw.Ptab)
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nl.NewRtAttrChild(police, nl.TCA_POLICE_PEAKRATE, payload)
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}
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}
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if fw.ClassId != 0 {
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b := make([]byte, 4)
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native.PutUint32(b, fw.ClassId)
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nl.NewRtAttrChild(options, nl.TCA_FW_CLASSID, b)
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}
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}
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req.AddData(options)
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_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
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return err
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}
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// FilterList gets a list of filters in the system.
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// Equivalent to: `tc filter show`.
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// Generally retunrs nothing if link and parent are not specified.
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func FilterList(link Link, parent uint32) ([]Filter, error) {
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req := nl.NewNetlinkRequest(syscall.RTM_GETTFILTER, syscall.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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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(syscall.NETLINK_ROUTE, syscall.RTM_NEWTFILTER)
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if err != nil {
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return nil, err
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}
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var res []Filter
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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 := FilterAttrs{
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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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}
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base.Priority, base.Protocol = MajorMinor(msg.Info)
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base.Protocol = nl.Swap16(base.Protocol)
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var filter Filter
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filterType := ""
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detailed := false
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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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filterType = string(attr.Value[:len(attr.Value)-1])
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switch filterType {
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case "u32":
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filter = &U32{}
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case "fw":
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filter = &Fw{}
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default:
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filter = &GenericFilter{FilterType: filterType}
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}
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case nl.TCA_OPTIONS:
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switch filterType {
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case "u32":
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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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detailed, err = parseU32Data(filter, data)
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if err != nil {
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return nil, err
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}
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case "fw":
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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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detailed, err = parseFwData(filter, 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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}
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}
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// only return the detailed version of the filter
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if detailed {
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*filter.Attrs() = base
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res = append(res, filter)
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}
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}
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return res, nil
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}
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func parseU32Data(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error) {
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native = nl.NativeEndian()
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u32 := filter.(*U32)
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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_U32_SEL:
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detailed = true
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sel := nl.DeserializeTcU32Sel(datum.Value)
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// only parse if we have a very basic redirect
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if sel.Flags&nl.TC_U32_TERMINAL == 0 || sel.Nkeys != 1 {
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return detailed, nil
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}
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case nl.TCA_U32_ACT:
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table, err := nl.ParseRouteAttr(datum.Value)
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if err != nil {
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return detailed, err
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}
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if len(table) != 1 || table[0].Attr.Type != nl.TCA_ACT_TAB {
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return detailed, fmt.Errorf("Action table not formed properly")
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}
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aattrs, err := nl.ParseRouteAttr(table[0].Value)
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for _, aattr := range aattrs {
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switch aattr.Attr.Type {
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case nl.TCA_KIND:
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actionType := string(aattr.Value[:len(aattr.Value)-1])
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// only parse if the action is mirred
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if actionType != "mirred" {
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return detailed, nil
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}
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case nl.TCA_OPTIONS:
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adata, err := nl.ParseRouteAttr(aattr.Value)
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if err != nil {
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return detailed, err
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}
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for _, adatum := range adata {
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switch adatum.Attr.Type {
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case nl.TCA_MIRRED_PARMS:
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mir := nl.DeserializeTcMirred(adatum.Value)
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u32.RedirIndex = int(mir.Ifindex)
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}
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}
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}
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}
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}
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}
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return detailed, nil
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}
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func parseFwData(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error) {
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native = nl.NativeEndian()
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fw := filter.(*Fw)
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detailed := true
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for _, datum := range data {
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switch datum.Attr.Type {
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case nl.TCA_FW_MASK:
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fw.Mask = native.Uint32(datum.Value[0:4])
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case nl.TCA_FW_CLASSID:
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fw.ClassId = native.Uint32(datum.Value[0:4])
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case nl.TCA_FW_INDEV:
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fw.InDev = string(datum.Value[:len(datum.Value)-1])
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case nl.TCA_FW_POLICE:
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adata, _ := nl.ParseRouteAttr(datum.Value)
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for _, aattr := range adata {
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switch aattr.Attr.Type {
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case nl.TCA_POLICE_TBF:
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fw.Police = *nl.DeserializeTcPolice(aattr.Value)
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case nl.TCA_POLICE_RATE:
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fw.Rtab = DeserializeRtab(aattr.Value)
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case nl.TCA_POLICE_PEAKRATE:
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fw.Ptab = DeserializeRtab(aattr.Value)
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}
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}
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}
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}
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return detailed, nil
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}
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func AlignToAtm(size uint) uint {
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var linksize, cells int
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cells = int(size / nl.ATM_CELL_PAYLOAD)
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if (size % nl.ATM_CELL_PAYLOAD) > 0 {
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cells++
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}
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linksize = cells * nl.ATM_CELL_SIZE
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return uint(linksize)
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}
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func AdjustSize(sz uint, mpu uint, linklayer int) uint {
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if sz < mpu {
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sz = mpu
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}
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switch linklayer {
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case nl.LINKLAYER_ATM:
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return AlignToAtm(sz)
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default:
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return sz
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}
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}
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func CalcRtable(rate *nl.TcRateSpec, rtab [256]uint32, cell_log int, mtu uint32, linklayer int) int {
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bps := rate.Rate
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mpu := rate.Mpu
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var sz uint
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if mtu == 0 {
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mtu = 2047
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}
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if cell_log < 0 {
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cell_log = 0
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for (mtu >> uint(cell_log)) > 255 {
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cell_log++
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}
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}
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for i := 0; i < 256; i++ {
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sz = AdjustSize(uint((i+1)<<uint32(cell_log)), uint(mpu), linklayer)
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rtab[i] = uint32(Xmittime(uint64(bps), uint32(sz)))
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}
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rate.CellAlign = -1
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rate.CellLog = uint8(cell_log)
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rate.Linklayer = uint8(linklayer & nl.TC_LINKLAYER_MASK)
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return cell_log
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}
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func DeserializeRtab(b []byte) [256]uint32 {
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var rtab [256]uint32
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native := nl.NativeEndian()
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r := bytes.NewReader(b)
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_ = binary.Read(r, native, &rtab)
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return rtab
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}
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func SerializeRtab(rtab [256]uint32) []byte {
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native := nl.NativeEndian()
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var w bytes.Buffer
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_ = binary.Write(&w, native, rtab)
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return w.Bytes()
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}
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