Signed-off-by: itoyuichi <[email protected]>
---
ryu/lib/packet/ipv6.py | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/ryu/lib/packet/ipv6.py b/ryu/lib/packet/ipv6.py
index 060e678..f8538c1 100644
--- a/ryu/lib/packet/ipv6.py
+++ b/ryu/lib/packet/ipv6.py
@@ -170,6 +170,51 @@ class header(stringify.StringifyMixin):
# TODO: implement a class for routing header
+class opt_header(header):
+ """an abstract class for Hop-by-Hop Options header and destination
+ header."""
+
+ _PACK_STR = '!BB'
+ _MIN_LEN = struct.calcsize(_PACK_STR)
+ _FIX_SIZE = 8
+
+ @abc.abstractmethod
+ def __init__(self, size, data):
+ super(opt_header, self).__init__()
+ assert not (size % 8)
+ self.size = size
+ self.data = data
+
+ @classmethod
+ def parser(cls, buf):
+ (nxt, len_) = struct.unpack_from(cls._PACK_STR, buf)
+ data_len = cls._FIX_SIZE + int(len_)
+ data = []
+ size = cls._MIN_LEN
+ while size < data_len:
+ (type_, ) = struct.unpack_from('!B', buf[size:])
+ if type_ == 0:
+ opt = option(type_, -1, None)
+ size += 1
+ else:
+ opt = option.parser(buf[size:])
+ size += len(opt)
+ data.append(opt)
+ ret = cls(len_, data)
+ ret.set_nxt(nxt)
+ return ret
+
+ def serialize(self):
+ buf = struct.pack(self._PACK_STR, self.nxt, self.size)
+ buf = bytearray(buf)
+ for opt in self.data:
+ buf.extend(opt.serialize())
+ return buf
+
+ def __len__(self):
+ return self._FIX_SIZE + self.size
+
+
class option(stringify.StringifyMixin):
"""IPv6 (RFC 2460) Options header encoder/decoder class.
--
1.7.10.4
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