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package bgp
import "encoding/binary"
const (
subSubTLVHdrLen = 3
)
type SubSubTLVType uint8
type SubSubTLV struct {
Type SubSubTLVType
Length uint16
}
func (s *SubSubTLV) Len() int {
return int(s.Length) + subSubTLVHdrLen
}
func (s *SubSubTLV) Serialize(value []byte) ([]byte, error) {
if len(value) != int(s.Length) {
return nil, malformedAttrListErr("serialization failed: Prefix SID TLV malformed")
}
// Extra byte is reserved
buf := make([]byte, subSubTLVHdrLen+len(value))
p := 0
buf[p] = byte(s.Type)
p++
binary.BigEndian.PutUint16(buf[p:p+2], uint16(s.Length))
p += 2
copy(buf[p:], value)
return buf, nil
}
func (s *SubSubTLV) DecodeFromBytes(data []byte) ([]byte, error) {
if len(data) < prefixSIDtlvHdrLen {
return nil, malformedAttrListErr("decoding failed: Prefix SID Sub Sub TLV malformed")
}
s.Type = SubSubTLVType(data[0])
s.Length = binary.BigEndian.Uint16(data[1:3])
if len(data) < s.Len() {
return nil, malformedAttrListErr("decoding failed: Prefix SID Sub Sub TLV malformed")
}
return data[prefixSIDtlvHdrLen:s.Len()], nil
}
// SRv6SIDStructureSubSubTLV defines a structure of SRv6 SID Structure Sub Sub TLV (type 1) object
// https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02#section-2.1.2.1
type SRv6SIDStructureSubSubTLV struct {
SubSubTLV
LocalBlockLength uint8 `json:"local_block_length,omitempty"`
LocatorNodeLength uint8 `json:"locator_node_length,omitempty"`
FunctionLength uint8 `json:"function_length,omitempty"`
ArgumentLength uint8 `json:"argument_length,omitempty"`
TranspositionLength uint8 `json:"transposition_length,omitempty"`
TranspositionOffset uint8 `json:"transposition_offset,omitempty"`
}
func (s *SRv6SIDStructureSubSubTLV) Len() int {
return int(s.Length) + subSubTLVHdrLen
}
func (s *SRv6SIDStructureSubSubTLV) Serialize() ([]byte, error) {
buf := make([]byte, s.Length)
p := 0
buf[p] = s.LocalBlockLength
p++
buf[p] = s.LocatorNodeLength
p++
buf[p] = s.FunctionLength
p++
buf[p] = s.ArgumentLength
p++
buf[p] = s.TranspositionLength
p++
buf[p] = s.TranspositionOffset
return s.SubSubTLV.Serialize(buf)
}
func (s *SRv6SIDStructureSubSubTLV) DecodeFromBytes(data []byte) error {
if len(data) < subSubTLVHdrLen {
return malformedAttrListErr("decoding failed: Prefix SID Sub Sub TLV malformed")
}
s.Type = SubSubTLVType(data[0])
s.Length = binary.BigEndian.Uint16(data[1:3])
s.LocalBlockLength = data[3]
s.LocatorNodeLength = data[4]
s.FunctionLength = data[5]
s.ArgumentLength = data[6]
s.TranspositionLength = data[7]
s.TranspositionOffset = data[8]
return nil
}
func (s *SRv6SIDStructureSubSubTLV) MarshalJSON() ([]byte, error) {
return nil, nil
}
func (s *SRv6SIDStructureSubSubTLV) String() string {
return ""
}
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