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 := nl.NewRtAttrChild(attr, tabIndex, nil)
tabIndex++
nl.NewRtAttrChild(table, nl.TCA_ACT_KIND, nl.ZeroTerminated("mirred"))
aopts := nl.NewRtAttrChild(table, nl.TCA_ACT_OPTIONS, nil)
mirred := nl.TcMirred{
Eaction: int32(action.MirredAction),
Ifindex: uint32(action.Ifindex),
}
toTcGen(action.Attrs(), &mirred.TcGen)
nl.NewRtAttrChild(aopts, nl.TCA_MIRRED_PARMS, mirred.Serialize())
case *BpfAction:
table := nl.NewRtAttrChild(attr, tabIndex, nil)
tabIndex++
nl.NewRtAttrChild(table, nl.TCA_ACT_KIND, nl.ZeroTerminated("bpf"))
aopts := nl.NewRtAttrChild(table, nl.TCA_ACT_OPTIONS, nil)
gen := nl.TcGen{}
toTcGen(action.Attrs(), &gen)
nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_PARMS, gen.Serialize())
nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_FD, nl.Uint32Attr(uint32(action.Fd)))
nl.NewRtAttrChild(aopts, nl.TCA_ACT_BPF_NAME, nl.ZeroTerminated(action.Name))
case *GenericAction:
table := nl.NewRtAttrChild(attr, tabIndex, nil)
tabIndex++
nl.NewRtAttrChild(table, nl.TCA_ACT_KIND, nl.ZeroTerminated("gact"))
aopts := nl.NewRtAttrChild(table, nl.TCA_ACT_OPTIONS, nil)
gen := nl.TcGen{}
toTcGen(action.Attrs(), &gen)
nl.NewRtAttrChild(aopts, nl.TCA_GACT_PARMS, gen.Serialize())
}
}
return nil
}
// FilterAdd will add a filter to the system.
// Equivalent to: `tc filter add $filter`
func FilterAdd(filter Filter) error {
req := nl.NewNetlinkRequest(syscall.RTM_NEWTFILTER, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.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)
if u32, ok := filter.(*U32); ok {
// match all
sel := nl.TcU32Sel{
Nkeys: 1,
Flags: nl.TC_U32_TERMINAL,
}
sel.Keys = append(sel.Keys, nl.TcU32Key{})
nl.NewRtAttrChild(options, nl.TCA_U32_SEL, sel.Serialize())
actions := nl.NewRtAttrChild(options, nl.TCA_U32_ACT, nil)
table := nl.NewRtAttrChild(actions, nl.TCA_ACT_TAB, nil)
nl.NewRtAttrChild(table, nl.TCA_KIND, nl.ZeroTerminated("mirred"))
// redirect to other interface
mir := nl.TcMirred{
Action: nl.TC_ACT_STOLEN,
Eaction: nl.TCA_EGRESS_REDIR,
Ifindex: uint32(u32.RedirIndex),
}
aopts := nl.NewRtAttrChild(table, nl.TCA_OPTIONS, nil)
nl.NewRtAttrChild(aopts, nl.TCA_MIRRED_PARMS, mir.Serialize())
}
req.AddData(options)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// FilterAdd will add a filter to the system.
// Equivalent to: `tc filter add $filter`
func FilterAdd(filter Filter) error {
native = nl.NativeEndian()
req := nl.NewNetlinkRequest(syscall.RTM_NEWTFILTER, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.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)
if u32, ok := filter.(*U32); ok {
// match all
sel := nl.TcU32Sel{
Nkeys: 1,
Flags: nl.TC_U32_TERMINAL,
}
sel.Keys = append(sel.Keys, nl.TcU32Key{})
nl.NewRtAttrChild(options, nl.TCA_U32_SEL, sel.Serialize())
actions := nl.NewRtAttrChild(options, nl.TCA_U32_ACT, nil)
table := nl.NewRtAttrChild(actions, nl.TCA_ACT_TAB, nil)
nl.NewRtAttrChild(table, nl.TCA_KIND, nl.ZeroTerminated("mirred"))
// redirect to other interface
mir := nl.TcMirred{
Action: nl.TC_ACT_STOLEN,
Eaction: nl.TCA_EGRESS_REDIR,
Ifindex: uint32(u32.RedirIndex),
}
aopts := nl.NewRtAttrChild(table, nl.TCA_OPTIONS, nil)
nl.NewRtAttrChild(aopts, nl.TCA_MIRRED_PARMS, mir.Serialize())
} else if fw, ok := filter.(*Fw); ok {
if fw.Mask != 0 {
b := make([]byte, 4)
native.PutUint32(b, fw.Mask)
nl.NewRtAttrChild(options, nl.TCA_FW_MASK, b)
}
if fw.InDev != "" {
nl.NewRtAttrChild(options, nl.TCA_FW_INDEV, nl.ZeroTerminated(fw.InDev))
}
if (fw.Police != nl.TcPolice{}) {
police := nl.NewRtAttrChild(options, nl.TCA_FW_POLICE, nil)
nl.NewRtAttrChild(police, nl.TCA_POLICE_TBF, fw.Police.Serialize())
if (fw.Police.Rate != nl.TcRateSpec{}) {
payload := SerializeRtab(fw.Rtab)
nl.NewRtAttrChild(police, nl.TCA_POLICE_RATE, payload)
}
if (fw.Police.PeakRate != nl.TcRateSpec{}) {
payload := SerializeRtab(fw.Ptab)
nl.NewRtAttrChild(police, nl.TCA_POLICE_PEAKRATE, payload)
}
}
if fw.ClassId != 0 {
b := make([]byte, 4)
native.PutUint32(b, fw.ClassId)
nl.NewRtAttrChild(options, nl.TCA_FW_CLASSID, b)
}
}
req.AddData(options)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}