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"""Flow Table Modification message."""
from enum import IntEnum
from pyof.foundation.base import GenericMessage
from pyof.foundation.basic_types import Pad, UBInt8, UBInt32
from pyof.v0x04.common.header import Header, Type
__all__ = ('Table', 'TableMod')
class Table(IntEnum):
"""Table numbering. Tables can use any number up to OFPT_MAX."""
#: Last usable table number.
OFPTT_MAX = 0xfe
# Fake tables.
#: Wildcard table used for table config, flow stats and flow deletes.
OFPTT_ALL = 0xff
class TableMod(GenericMessage):
"""Configure/Modify behavior of a flow table."""
header = Header(message_type=Type.OFPT_TABLE_MOD)
table_id = UBInt8()
#: Pad to 32 bits
pad = Pad(3)
config = UBInt32()
def __init__(self, xid=None, table_id=Table.OFPTT_ALL, config=3):
"""Assing parameters to object attributes.
Args:
xid (int): :class:`~pyof.v0x04.common.header.Header`'s xid.
Defaults to random.
table_id (int): ID of the table, OFPTT_ALL indicates all tables.
config (int): Bitmap of OFPTC_* flags
"""
super().__init__(xid)
self.table_id = table_id
# This is reserved for future used. The default value is the only valid
# one from the Enum.
self.config = config
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