// parseMulticastGroups parses an array of multicast group nested attributes
// into a slice of MulticastGroups.
func parseMulticastGroups(b []byte) ([]MulticastGroup, error) {
attrs, err := netlink.UnmarshalAttributes(b)
if err != nil {
return nil, err
}
groups := make([]MulticastGroup, 0, len(attrs))
for i, a := range attrs {
// The type attribute is essentially an array index here; it starts
// at 1 and should increment for each new array element
if int(a.Type) != i+1 {
return nil, errInvalidMulticastGroupArray
}
nattrs, err := netlink.UnmarshalAttributes(a.Data)
if err != nil {
return nil, err
}
var g MulticastGroup
for _, na := range nattrs {
switch na.Type {
case attrMGName:
g.Name = nlenc.String(na.Data)
case attrMGID:
g.ID = nlenc.Uint32(na.Data)
}
}
groups = append(groups, g)
}
return groups, nil
}
// parseAttributes parses netlink attributes into a Family's fields.
func (f *Family) parseAttributes(attrs []netlink.Attribute) error {
for _, a := range attrs {
switch a.Type {
case attrFamilyID:
f.ID = nlenc.Uint16(a.Data)
case attrFamilyName:
f.Name = nlenc.String(a.Data)
case attrVersion:
v := nlenc.Uint32(a.Data)
if v > math.MaxUint8 {
return errInvalidFamilyVersion
}
f.Version = uint8(v)
case attrMulticastGroups:
groups, err := parseMulticastGroups(a.Data)
if err != nil {
return err
}
f.Groups = groups
}
}
return nil
}
// parseAttributes parses netlink attributes into an Interface's fields.
func (ifi *Interface) parseAttributes(attrs []netlink.Attribute) error {
for _, a := range attrs {
switch a.Type {
case nl80211.AttrIfindex:
ifi.Index = int(nlenc.Uint32(a.Data))
case nl80211.AttrIfname:
ifi.Name = nlenc.String(a.Data)
case nl80211.AttrMac:
ifi.HardwareAddr = net.HardwareAddr(a.Data)
case nl80211.AttrWiphy:
ifi.PHY = int(nlenc.Uint32(a.Data))
case nl80211.AttrIftype:
// NOTE: InterfaceType copies the ordering of nl80211's interface type
// constants. This may not be the case on other operating systems.
ifi.Type = InterfaceType(nlenc.Uint32(a.Data))
case nl80211.AttrWdev:
ifi.Device = int(nlenc.Uint64(a.Data))
case nl80211.AttrWiphyFreq:
ifi.Frequency = int(nlenc.Uint32(a.Data))
}
}
return nil
}