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.yusu...@gmail.com>
---
ryu/lib/packet/bgp.py | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/ryu/lib/packet/bgp.py b/ryu/lib/packet/bgp.py
index 9d77cdb..0086a92 100644
--- a/ryu/lib/packet/bgp.py
+++ b/ryu/lib/packet/bgp.py
@@ -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:
--
2.7.4
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