func (self matchHash) Key(target matchHash) uint32 {
hasher := fnv.New32()
for k, s := range self {
var value, mask []byte
if bKey, ok := k.(OxmKeyBasic); !ok || oxm.Header(bKey).Class() != ofp4.OFPXMC_OPENFLOW_BASIC {
continue
} else {
length, _ := ofp4.OxmOfDefs(uint32(bKey))
value = make([]byte, length)
mask = make([]byte, length)
}
if t, ok := target[k]; ok {
a := s.(OxmValueMask)
b := t.(OxmValueMask)
for i, _ := range mask {
mask[i] = 0xFF
}
if a.Mask != nil {
for i, _ := range mask {
mask[i] &= a.Mask[i]
}
}
if b.Mask != nil {
for i, _ := range mask {
mask[i] &= b.Mask[i]
}
}
for i, _ := range value {
value[i] = b.Value[i] & mask[i]
}
}
hasher.Write(value)
}
return hasher.Sum32()
}
func (self oxmBasic) OxmId(id uint32) uint32 {
length, mask := ofp4.OxmOfDefs(id)
hdr := oxm.Header(id)
hdr.SetMask(mask)
if mask {
hdr.SetLength(length * 2)
} else {
hdr.SetLength(length)
}
return uint32(hdr)
}
// creates a common match union parameter.
func (self matchHash) Merge(from matchHash) {
var removal []OxmKey
for k, s := range self {
var a, b OxmValueMask
var length int
if bKey, ok := k.(OxmKeyBasic); !ok || oxm.Header(bKey).Class() != ofp4.OFPXMC_OPENFLOW_BASIC {
continue
} else if f, ok := from[k]; !ok {
removal = append(removal, k)
continue
} else {
a = s.(OxmValueMask)
b = f.(OxmValueMask)
length, _ = ofp4.OxmOfDefs(uint32(bKey))
}
fullMask := true
mask := make([]byte, length)
for i, _ := range mask {
mask[i] = 0xFF
}
if a.Mask != nil {
for i, _ := range mask {
mask[i] &= a.Mask[i]
}
}
if b.Mask != nil {
for i, _ := range mask {
mask[i] &= b.Mask[i]
}
}
for i, m := range mask {
mask[i] &^= (a.Value[i] & m) ^ (b.Value[i] & m)
if mask[i] != 0 {
fullMask = false
}
}
if fullMask {
removal = append(removal, k)
continue
}
payload := OxmValueMask{
Value: make([]byte, length),
Mask: mask,
}
for i, m := range mask {
payload.Value[i] = a.Value[i] & m
}
self[k] = payload
}
for _, rem := range removal {
delete(self, rem)
}
}
func makeOxmBasic(oxmType uint32) []byte {
length, mask := ofp4.OxmOfDefs(oxmType)
if mask {
length = length * 2
}
hdr := oxm.Header(oxmType)
hdr.SetMask(mask)
hdr.SetLength(length)
buf := make([]byte, 4+length)
binary.BigEndian.PutUint32(buf, oxmType)
return buf
}
