func ParseAction(txt string) (buf []byte, eatLen int, err error) {
generic := func(atype uint16) {
buf = make([]byte, 8)
binary.BigEndian.PutUint16(buf, atype)
}
label, value, eatLen := parseLabeledValue(txt)
switch label {
case "copy_ttl_out":
generic(OFPAT_COPY_TTL_OUT)
case "copy_ttl_in":
generic(OFPAT_COPY_TTL_IN)
case "dec_mpls_ttl":
generic(OFPAT_DEC_MPLS_TTL)
case "pop_vlan":
generic(OFPAT_POP_VLAN)
case "dec_nw_ttl":
generic(OFPAT_DEC_NW_TTL)
case "pop_pbb":
generic(OFPAT_POP_PBB)
case "output":
vs := strings.SplitN(value, ":", 2)
var port uint32
switch vs[0] {
case "max":
port = OFPP_MAX
case "in_port":
port = OFPP_IN_PORT
case "table":
port = OFPP_TABLE
case "normal":
port = OFPP_NORMAL
case "flood":
port = OFPP_FLOOD
case "all":
port = OFPP_ALL
case "controller":
port = OFPP_CONTROLLER
case "local":
port = OFPP_LOCAL
case "any":
port = OFPP_ANY
default:
if err = parseInt(vs[0], &port); err != nil {
return
}
}
maxLen := uint16(OFPCML_NO_BUFFER)
if len(vs) > 1 {
if err = parseInt(vs[1], &maxLen); err != nil {
return
}
}
buf = make([]byte, 16)
binary.BigEndian.PutUint16(buf, OFPAT_OUTPUT)
binary.BigEndian.PutUint32(buf[4:], port)
binary.BigEndian.PutUint16(buf[8:], maxLen)
case "set_mpls_ttl", "set_nw_ttl":
var v uint8
if err = parseInt(value, &v); err != nil {
return
}
switch label {
case "set_mpls_ttl":
generic(OFPAT_SET_MPLS_TTL)
case "set_nw_ttl":
generic(OFPAT_SET_NW_TTL)
}
buf[4] = v
case "push_vlan", "push_mpls", "pop_mpls", "push_pbb":
var v uint16
if err = parseInt(value, &v); err != nil {
return
}
switch label {
case "push_vlan":
generic(OFPAT_PUSH_VLAN)
case "push_mpls":
generic(OFPAT_PUSH_MPLS)
case "pop_mpls":
generic(OFPAT_POP_MPLS)
case "push_pbb":
generic(OFPAT_PUSH_PBB)
}
binary.BigEndian.PutUint16(buf[4:], v)
case "group", "set_queue":
var v uint32
if err = parseInt(value, &v); err != nil {
return
}
switch label {
case "group":
generic(OFPAT_GROUP)
case "set_queue":
generic(OFPAT_SET_QUEUE)
}
binary.BigEndian.PutUint32(buf[4:], v)
default:
// set-field
if strings.HasPrefix(label, "set_") {
setLen := len("set_")
if p, n, e := oxm.ParseOne(txt[setLen:]); e != nil {
err = e
} else {
buf = make([]byte, align8(4+len(p)))
binary.BigEndian.PutUint16(buf, OFPAT_SET_FIELD)
copy(buf[4:], p)
eatLen = setLen + n
}
} else {
for _, handler := range actionStringers {
if buf, eatLen, err = handler.ToAction(txt); err == nil {
return
}
}
}
}
if len(buf) == 0 {
err = fmt.Errorf("unparsed")
} else {
binary.BigEndian.PutUint16(buf[2:], uint16(len(buf)))
}
return
}
func (self *flowRule) Parse(txt string) error {
var actions []byte
var delayed func() = nil
phase := PHASE_MATCH
for len(txt) > 0 {
// in case value would include separator, don't use these value and just recalculate
label, value, step := parseLabeledValue(txt)
if label[0] == '@' && delayed != nil {
delayed()
delayed = nil
}
switch label {
case "@meter":
phase = PHASE_METER
var meterId uint32
if err := parseInt(value, &meterId); err != nil {
return err
}
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_METER)
binary.BigEndian.PutUint16(inst[2:], 8)
binary.BigEndian.PutUint32(inst[4:], meterId)
self.Instructions = append(self.Instructions, inst[:]...)
case "@apply", "@apply_actions":
phase = PHASE_APPLY
delayed = func() {
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_APPLY_ACTIONS)
binary.BigEndian.PutUint16(inst[2:], uint16(len(actions)+8))
self.Instructions = append(self.Instructions, inst[:]...)
self.Instructions = append(self.Instructions, actions...)
actions = actions[:0]
}
case "@clear", "@clear_actions":
phase = PHASE_CLEAR
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_CLEAR_ACTIONS)
binary.BigEndian.PutUint16(inst[2:], 8)
self.Instructions = append(self.Instructions, inst[:]...)
case "@write", "@write_actions":
phase = PHASE_WRITE
delayed = func() {
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_WRITE_ACTIONS)
binary.BigEndian.PutUint16(inst[2:], uint16(len(actions)+8))
self.Instructions = append(self.Instructions, inst[:]...)
self.Instructions = append(self.Instructions, actions...)
actions = actions[:0]
}
case "@metadata", "@write_metadata":
phase = PHASE_META
var v, m uint64
vm := strings.SplitN(value, "/", 2)
if err := parseInt(vm[0], &v); err != nil {
return err
}
if len(vm) == 2 {
if err := parseInt(vm[1], &m); err != nil {
return err
}
} else {
m = 0xFFFFFFFFFFFFFFFF
}
var inst [24]byte
binary.BigEndian.PutUint16(inst[0:], OFPIT_WRITE_METADATA)
binary.BigEndian.PutUint16(inst[2:], 24)
binary.BigEndian.PutUint64(inst[8:], v)
binary.BigEndian.PutUint64(inst[16:], m)
self.Instructions = append(self.Instructions, inst[:]...)
case "@goto", "@goto_table":
phase = PHASE_GOTO
var tableId uint8
if err := parseInt(value, &tableId); err != nil {
return err
}
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_GOTO_TABLE)
binary.BigEndian.PutUint16(inst[2:], uint16(len(inst)))
inst[4] = tableId
self.Instructions = append(self.Instructions, inst[:]...)
default:
switch phase {
case PHASE_MATCH:
switch label {
case "table":
var v uint8
if err := parseInt(value, &v); err != nil {
return err
}
self.TableId = v
case "priority", "idle_timeout", "hard_timeout":
var v uint16
if err := parseInt(value, &v); err != nil {
return err
}
switch label {
case "idle_timeout":
self.IdleTimeout = v
case "hard_timeout":
self.HardTimeout = v
case "priority":
self.Priority = v
}
case "cookie":
var v, m uint64
vm := strings.SplitN(value, "/", 2)
if err := parseInt(vm[0], &v); err != nil {
return err
}
if len(vm) == 2 {
if err := parseInt(vm[1], &m); err != nil {
return err
}
}
self.Cookie = v
self.CookieMask = m
case "out_port":
var v uint32
if err := parseInt(value, &v); err != nil {
return err
}
self.OutPort = v
case "out_group", "group":
var v uint32
if err := parseInt(value, &v); err != nil {
return err
}
self.OutGroup = v
default:
if buf, n, err := oxm.ParseOne(txt); err != nil {
return err
} else {
self.Match = append(self.Match, buf...)
step = n
}
}
case PHASE_APPLY, PHASE_WRITE:
if buf, n, err := ParseAction(txt); err != nil {
break
} else {
actions = append(actions, buf...)
step = n
}
}
}
for i, c := range txt[step:] {
if !oxm.IsSeparator(c) {
step += i
break
}
}
txt = txt[step:]
}
if delayed != nil {
delayed()
}
return nil
}