Example #1
0
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
}
Example #2
0
// 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
}