// QdiscList gets a list of qdiscs in the system.
// Equivalent to: `tc qdisc show`.
// The list can be filtered by link.
func QdiscList(link Link) ([]Qdisc, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETQDISC, syscall.NLM_F_DUMP)
index := int32(0)
if link != nil {
base := link.Attrs()
ensureIndex(base)
index = int32(base.Index)
}
msg := &nl.TcMsg{
Family: nl.FAMILY_ALL,
Ifindex: index,
}
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWQDISC)
if err != nil {
return nil, err
}
var res []Qdisc
for _, m := range msgs {
msg := nl.DeserializeTcMsg(m)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
// skip qdiscs from other interfaces
if link != nil && msg.Ifindex != index {
continue
}
base := QdiscAttrs{
LinkIndex: int(msg.Ifindex),
Handle: msg.Handle,
Parent: msg.Parent,
Refcnt: msg.Info,
}
var qdisc Qdisc
qdiscType := ""
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.TCA_KIND:
qdiscType = string(attr.Value[:len(attr.Value)-1])
switch qdiscType {
case "pfifo_fast":
qdisc = &PfifoFast{}
case "prio":
qdisc = &Prio{}
case "tbf":
qdisc = &Tbf{}
case "ingress":
qdisc = &Ingress{}
case "htb":
qdisc = &Htb{}
default:
qdisc = &GenericQdisc{QdiscType: qdiscType}
}
case nl.TCA_OPTIONS:
switch qdiscType {
case "pfifo_fast":
// pfifo returns TcPrioMap directly without wrapping it in rtattr
if err := parsePfifoFastData(qdisc, attr.Value); err != nil {
return nil, err
}
case "prio":
// prio returns TcPrioMap directly without wrapping it in rtattr
if err := parsePrioData(qdisc, attr.Value); err != nil {
return nil, err
}
case "tbf":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
if err := parseTbfData(qdisc, data); err != nil {
return nil, err
}
case "htb":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
if err := parseHtbData(qdisc, data); err != nil {
return nil, err
}
// no options for ingress
}
}
}
*qdisc.Attrs() = base
res = append(res, qdisc)
}
return res, nil
}
// FilterList gets a list of filters in the system.
// Equivalent to: `tc filter show`.
// Generally retunrs nothing if link and parent are not specified.
func FilterList(link Link, parent uint32) ([]Filter, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETTFILTER, syscall.NLM_F_DUMP)
msg := &nl.TcMsg{
Family: nl.FAMILY_ALL,
Parent: parent,
}
if link != nil {
base := link.Attrs()
ensureIndex(base)
msg.Ifindex = int32(base.Index)
}
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.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{}
default:
filter = &GenericFilter{FilterType: filterType}
}
case nl.TCA_OPTIONS:
switch filterType {
case "u32":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
detailed, err = parseU32Data(filter, data)
if err != nil {
return nil, err
}
}
}
}
// only return the detailed version of the filter
if detailed {
*filter.Attrs() = base
res = append(res, filter)
}
}
return res, nil
}
// ClassList gets a list of classes in the system.
// Equivalent to: `tc class show`.
// Generally retunrs nothing if link and parent are not specified.
func ClassList(link Link, parent uint32) ([]Class, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETTCLASS, syscall.NLM_F_DUMP)
msg := &nl.TcMsg{
Family: nl.FAMILY_ALL,
Parent: parent,
}
if link != nil {
base := link.Attrs()
ensureIndex(base)
msg.Ifindex = int32(base.Index)
}
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWTCLASS)
if err != nil {
return nil, err
}
var res []Class
for _, m := range msgs {
msg := nl.DeserializeTcMsg(m)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
base := ClassAttrs{
LinkIndex: int(msg.Ifindex),
Handle: msg.Handle,
Parent: msg.Parent,
}
var class Class
classType := ""
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.TCA_KIND:
classType = string(attr.Value[:len(attr.Value)-1])
switch classType {
case "htb":
class = &HtbClass{}
default:
class = &GenericClass{ClassType: classType}
}
case nl.TCA_OPTIONS:
switch classType {
case "htb":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
_, err = parseHtbClassData(class, data)
if err != nil {
return nil, err
}
}
}
}
*class.Attrs() = base
res = append(res, class)
}
return res, nil
}