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packet/bgp: Enable Extended Length flags if specified

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Currently, the Extended Length flag in path attributes is evaluated
only when the length exceeds 1 byte (max 255) field.
This patch enables this flags if explicitly specified.

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
IWASE Yusuke 2016-11-07 16:04:17 +09:00 committed by FUJITA Tomonori
parent b9e4345d5d
commit 31364ba91d
1 changed files with 7 additions and 4 deletions
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11
ryu/lib/packet/bgp.py
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@ -2248,12 +2248,15 @@ class _PathAttribute(StringifyMixin, _TypeDisp, _Value):
def serialize(self):
# fixup
if self._ATTR_FLAGS is not None:
self.flags = self.flags \
& ~(BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANSITIVE) \
| self._ATTR_FLAGS
self.flags = (
self.flags
& ~(BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANSITIVE)
| self._ATTR_FLAGS)
value = self.serialize_value()
self.length = len(value)
if self.length > 255:
if self.flags & BGP_ATTR_FLAG_EXTENDED_LENGTH:
len_pack_str = self._PACK_STR_EXT_LEN
elif self.length > 255:
self.flags |= BGP_ATTR_FLAG_EXTENDED_LENGTH
len_pack_str = self._PACK_STR_EXT_LEN
else: