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beba_v1_0_parser.py
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beba_v1_0_parser.py
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import struct
from ryu.lib.pack_utils import msg_pack_into
from ryu.ofproto.ofproto_parser import StringifyMixin, MsgBase, msg_str_attr
import ryu.ofproto.ofproto_v1_3_parser as ofproto_parser
import ryu.ofproto.ofproto_v1_3 as ofproto
import ryu.ofproto.beba_v1_0 as bebaproto
from ryu import utils
import logging
import six
from array import array
LOG = logging.getLogger('ryu.ofproto.beba_v1_0_parser')
def OFPExpActionSetState(state, table_id, bit=0, hard_timeout=0, idle_timeout=0, hard_rollback=0, idle_rollback=0, state_mask=0xffffffff):
"""
Returns a Set state experimenter action
This action applies the state. TO DO: look how deal with ofl msg instruction
and also cls
================ ======================================================
Attribute Description
================ ======================================================
state State instance
state_mask State mask
table_id Stage ID
bit Enable/Disable swapping of the source/destination addresses a
and source/destination ports in the case of bi-flow identificatin
================ ======================================================
"""
act_type=bebaproto.OFPAT_EXP_SET_STATE
data=struct.pack(bebaproto.OFP_EXP_ACTION_SET_STATE_PACK_STR, act_type, state, state_mask, table_id ,hard_rollback, idle_rollback, hard_timeout*1000000, idle_timeout*1000000,bit)
return ofproto_parser.OFPActionExperimenterUnknown(experimenter=0xBEBABEBA, data=data)
def OFPExpActionSetGlobalState(global_state, global_state_mask=0xffffffff):
"""
Returns a Set Global State experimenter action
This action updates the switch global state.
================ ======================================================
Attribute Description
================ ======================================================
global_state Global state value
global_state_mask Mask value
================ ======================================================
"""
act_type=bebaproto.OFPAT_EXP_SET_GLOBAL_STATE
data=struct.pack(bebaproto.OFP_EXP_ACTION_SET_GLOBAL_STATE_PACK_STR, act_type, global_state, global_state_mask)
return ofproto_parser.OFPActionExperimenterUnknown(experimenter=0XBEBABEBA, data=data)
def OFPExpActionIncState(table_id):
"""
Returns a Set Inc state experimenter action
This action increment the current state.
================ ======================================================
Attribute Description
================ ======================================================
table_id Stage ID
================ ======================================================
"""
act_type=bebaproto.OFPAT_EXP_INC_STATE
data=struct.pack(bebaproto.OFP_EXP_ACTION_INC_STATE_PACK_STR, act_type, table_id)
return ofproto_parser.OFPActionExperimenterUnknown(experimenter=0xBEBABEBA, data=data)
def OFPExpMsgConfigureStatefulTable(datapath, stateful, table_id):
command=bebaproto.OFPSC_EXP_STATEFUL_TABLE_CONFIG
data=struct.pack(bebaproto.OFP_EXP_STATE_MOD_PACK_STR, command)
data+=struct.pack(bebaproto.OFP_EXP_STATE_MOD_STATEFUL_TABLE_CONFIG_PACK_STR,table_id,stateful)
exp_type=bebaproto.OFPT_EXP_STATE_MOD
return ofproto_parser.OFPExperimenter(datapath=datapath, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
def OFPExpMsgKeyExtract(datapath, command, fields, table_id,bit=0):
field_count=len(fields)
if field_count > bebaproto.MAX_FIELD_COUNT:
field_count = 0
LOG.debug("OFPExpMsgKeyExtract: Number of fields given > MAX_FIELD_COUNT")
data=struct.pack(bebaproto.OFP_EXP_STATE_MOD_PACK_STR, command)
data+=struct.pack(bebaproto.OFP_EXP_STATE_MOD_EXTRACTOR_PACK_STR,table_id,bit,field_count)
field_extract_format='!I'
if field_count <= bebaproto.MAX_FIELD_COUNT:
for f in range(field_count):
data+=struct.pack(field_extract_format,fields[f])
exp_type=bebaproto.OFPT_EXP_STATE_MOD
# store lookup-scopes
if command == bebaproto.OFPSC_EXP_SET_L_EXTRACTOR:
if hasattr(datapath, 'lookup_scope'):
datapath.lookup_scope[table_id] = fields
else:
datapath.lookup_scope = {table_id: fields}
return ofproto_parser.OFPExperimenter(datapath=datapath, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
def OFPExpMsgSetFlowState(datapath, state, keys, table_id, idle_timeout=0, idle_rollback=0, hard_timeout=0, hard_rollback=0, state_mask=0xffffffff):
key_count=len(keys)
if key_count > bebaproto.MAX_KEY_LEN:
key_count = 0
LOG.debug("OFPExpMsgSetFlowState: Number of keys given > MAX_KEY_LEN")
command=bebaproto.OFPSC_EXP_SET_FLOW_STATE
data=struct.pack(bebaproto.OFP_EXP_STATE_MOD_PACK_STR, command)
data+=struct.pack(bebaproto.OFP_EXP_STATE_MOD_SET_FLOW_STATE_PACK_STR, table_id, key_count, state, state_mask, hard_rollback, idle_rollback, hard_timeout*1000000, idle_timeout*1000000)
field_extract_format='!B'
if key_count <= bebaproto.MAX_KEY_LEN:
for f in range(key_count):
data+=struct.pack(field_extract_format,keys[f])
exp_type=bebaproto.OFPT_EXP_STATE_MOD
return ofproto_parser.OFPExperimenter(datapath=datapath, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
def OFPExpMsgDelFlowState(datapath, keys, table_id):
key_count=len(keys)
if key_count > bebaproto.MAX_KEY_LEN:
key_count = 0
LOG.debug("OFPExpMsgDelFlowState: Number of keys given > MAX_KEY_LEN")
command=bebaproto.OFPSC_EXP_DEL_FLOW_STATE
data=struct.pack(bebaproto.OFP_EXP_STATE_MOD_PACK_STR, command)
data+=struct.pack(bebaproto.OFP_EXP_STATE_MOD_DEL_FLOW_STATE_PACK_STR,table_id,key_count)
field_extract_format='!B'
if key_count <= bebaproto.MAX_KEY_LEN:
for f in range(key_count):
data+=struct.pack(field_extract_format,keys[f])
exp_type=bebaproto.OFPT_EXP_STATE_MOD
return ofproto_parser.OFPExperimenter(datapath=datapath, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
def OFPExpSetGlobalState(datapath, global_state, global_state_mask=0xffffffff):
data=struct.pack(bebaproto.OFP_EXP_STATE_MOD_PACK_STR, bebaproto.OFPSC_EXP_SET_GLOBAL_STATE)
data+=struct.pack(bebaproto.OFP_EXP_STATE_MOD_SET_GLOBAL_STATE_PACK_STR,global_state,global_state_mask)
exp_type=bebaproto.OFPT_EXP_STATE_MOD
return ofproto_parser.OFPExperimenter(datapath=datapath, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
def OFPExpResetGlobalState(datapath):
data=struct.pack(bebaproto.OFP_EXP_STATE_MOD_PACK_STR, bebaproto.OFPSC_EXP_RESET_GLOBAL_STATE)
exp_type=bebaproto.OFPT_EXP_STATE_MOD
return ofproto_parser.OFPExperimenter(datapath=datapath, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
def OFPExpStateStatsMultipartRequestBase(datapath, exp_type, table_id=ofproto.OFPTT_ALL, state=None, match=None):
flags = 0 # Zero or ``OFPMPF_REQ_MORE``
get_from_state = 1
if state is None:
get_from_state = 0
state = 0
if match is None:
match = ofproto_parser.OFPMatch()
data = bytearray()
msg_pack_into(bebaproto.OFP_STATE_STATS_REQUEST_0_PACK_STR, data, 0, table_id, get_from_state, state)
offset = bebaproto.OFP_STATE_STATS_REQUEST_0_SIZE
match.serialize(data, offset)
return ofproto_parser.OFPExperimenterStatsRequest(datapath=datapath, flags=flags, experimenter=0xBEBABEBA,
exp_type=exp_type, data=data)
def OFPExpStateStatsMultipartRequest(datapath, table_id=ofproto.OFPTT_ALL, state=None, match=None):
return OFPExpStateStatsMultipartRequestBase(datapath=datapath, exp_type=bebaproto.OFPMP_EXP_STATE_STATS,
table_id=table_id, state=state, match=match)
def OFPExpStateStatsMultipartRequestAndDelete(datapath, table_id=ofproto.OFPTT_ALL, state=None, match=None):
return OFPExpStateStatsMultipartRequestBase(datapath=datapath, exp_type=bebaproto.OFPMP_EXP_STATE_STATS_AND_DELETE,
table_id=table_id, state=state, match=match)
def OFPExpStateStatsMultipartRequestShort(datapath, table_id=ofproto.OFPTT_ALL, state=None, match=None):
return OFPExpStateStatsMultipartRequestBase(datapath=datapath, exp_type=bebaproto.OFPMP_EXP_STATE_STATS_SHORT,
table_id=table_id, state=state, match=match)
def OFPExpStateStatsMultipartRequestAndDeleteShort(datapath, table_id=ofproto.OFPTT_ALL, state=None, match=None):
return OFPExpStateStatsMultipartRequestBase(datapath=datapath, exp_type=bebaproto.OFPMP_EXP_STATE_STATS_AND_DELETE_SHORT,
table_id=table_id, state=state, match=match)
"""
State Sync: Controller asks for flows in a specific state
"""
def OFPExpGetFlowsInState(datapath, table_id=ofproto.OFPTT_ALL, state=None):
return OFPExpStateStatsMultipartRequest(datapath=datapath, table_id=table_id, state=state, match=None)
"""
State Sync: Controller asks for the state of a flow
"""
def OFPExpGetFlowState(datapath, table_id=ofproto.OFPTT_ALL, match=None):
return OFPExpStateStatsMultipartRequest(datapath=datapath, table_id=table_id, state=None, match=match)
"""
State Sync: This function returns the global state of a switch
"""
def OFPExpGlobalStateStatsMultipartRequest(datapath):
flags = 0 # Zero or ``OFPMPF_REQ_MORE``
data=bytearray()
exp_type=bebaproto.OFPMP_EXP_GLOBAL_STATE_STATS
return ofproto_parser.OFPExperimenterStatsRequest(datapath=datapath, flags=flags, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
def OFPErrorExperimenterMsg_handler(ev):
msg = ev.msg
LOG.debug('')
LOG.debug('OFPErrorExperimenterMsg received.')
LOG.debug('version=%s, msg_type=%s, msg_len=%s, xid=%s',hex(msg.version),
hex(msg.msg_type), hex(msg.msg_len), hex(msg.xid))
LOG.debug(' `-- msg_type: %s',ofproto.ofp_msg_type_to_str(msg.msg_type))
LOG.debug("OFPErrorExperimenterMsg(type=%s, exp_type=%s, experimenter_id='%s')",hex(msg.type),
hex(msg.exp_type), hex(msg.experimenter))
LOG.debug(' |-- type: %s',ofproto.ofp_error_type_to_str(msg.type))
LOG.debug(' |-- exp_type: %s',bebaproto.ofp_error_code_to_str(msg.type,msg.exp_type))
LOG.debug(' |-- experimenter_id: %s',hex(msg.experimenter))
(version, msg_type, msg_len, xid) = struct.unpack_from(ofproto.OFP_HEADER_PACK_STR,
six.binary_type(msg.data))
LOG.debug(
' `-- data: version=%s, msg_type=%s, msg_len=%s, xid=%s',
hex(version), hex(msg_type), hex(msg_len), hex(xid))
def OFPExpMsgAddPktTmp(datapath, pkttmp_id, pkt_data):
command=bebaproto.OFPSC_ADD_PKTTMP
data=struct.pack(bebaproto.OFP_EXP_PKTTMP_MOD_PACK_STR, command)
data+=struct.pack(bebaproto.OFP_EXP_PKTTMP_MOD_ADD_PKTTMP_PACK_STR, pkttmp_id)
data+=pkt_data
#print("Data:%s\n" % ''.join( [ "%02X " % ord( x ) for x in data ] ).strip())
exp_type=bebaproto.OFPT_EXP_PKTTMP_MOD
return ofproto_parser.OFPExperimenter(datapath=datapath, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
def OFPExpMsgDelPktTmp(datapath, pkttmp_id):
command=bebaproto.OFPSC_DEL_PKTTMP
data=struct.pack(bebaproto.OFP_EXP_PKTTMP_MOD_PACK_STR, command)
data+=struct.pack(bebaproto.OFP_EXP_PKTTMP_MOD_DEL_PKTTMP_PACK_STR, pkttmp_id)
#LOG.error("OFPExpMsgSetFlowState: Number of keys given > MAX_KEY_LEN")
exp_type=bebaproto.OFPT_EXP_PKTTMP_MOD
return ofproto_parser.OFPExperimenter(datapath=datapath, experimenter=0xBEBABEBA, exp_type=exp_type, data=data)
class OFPInstructionInSwitchPktGen(ofproto_parser.OFPInstruction):
"""
In Switch Packet Generation instruction
This instruction triggers the generation of a packet.
================ ======================================================
Attribute Description
================ ======================================================
type OFPIT_EXPERIMENTER
experimenter_id BEBA_VENDOR_ID
instr_type OFPIT_IN_SWITCH_PKT_GEN
actions list of OpenFlow action class
================ ======================================================
"""
def __init__(self, pkttmp_id, actions=None, len_=None):
super(OFPInstructionInSwitchPktGen, self).__init__()
self.type = ofproto.OFPIT_EXPERIMENTER
self.experimenter_id = bebaproto.BEBA_EXPERIMENTER_ID
self.instr_type = bebaproto.OFPIT_IN_SWITCH_PKT_GEN
self.pkttmp_id = pkttmp_id
for a in actions:
assert isinstance(a, ofproto_parser.OFPAction)
self.actions = actions
@classmethod
def parser(cls, buf, offset):
(type_, len_, experimenter_id_, instr_type_) = struct.unpack_from(
bebaproto.OFP_INSTRUCTION_INSWITCH_PKT_GEN_PACK_STR,
buf, offset)
offset += bebaproto.OFP_INSTRUCTION_INSWITCH_PKT_GEN_SIZE
actions = []
actions_len = len_ - bebaproto.OFP_INSTRUCTION_INSWITCH_PKT_GEN_SIZE
while actions_len > 0:
a = ofproto_parser.OFPAction.parser(buf, offset)
actions.append(a)
actions_len -= a.len
offset += a.len
inst = cls(type_, actions)
inst.len = len_
inst.experimenter_id = experimenter_id_
inst.instr_type = instr_type_
return inst
def serialize(self, buf, offset):
action_offset = offset + bebaproto.OFP_INSTRUCTION_INSWITCH_PKT_GEN_SIZE
if self.actions:
for a in self.actions:
a.serialize(buf, action_offset)
action_offset += a.len
self.len = action_offset - offset
pad_len = utils.round_up(self.len, 8) - self.len
msg_pack_into("%dx" % pad_len, buf, action_offset)
self.len += pad_len
msg_pack_into(bebaproto.OFP_INSTRUCTION_INSWITCH_PKT_GEN_PACK_STR,
buf, offset, self.type, self.len, self.experimenter_id,
self.instr_type, self.pkttmp_id)
class OFPStateEntry(object):
def __init__(self, key_count=None, key=None, state=None):
super(OFPStateEntry, self).__init__()
self.key_count=key_count
self.key = key
self.state = state
@classmethod
def parser(cls, buf, offset, key_count, state):
entry = OFPStateEntry(key_count=key_count, state=state)
entry.key = []
if entry.key_count <= bebaproto.MAX_KEY_LEN:
for f in range(entry.key_count):
key=struct.unpack_from('!B',buf,offset,)
entry.key.append(key[0])
offset +=1
offset += (utils.round_up(entry.key_count, 8) - entry.key_count)
return entry, offset
class OFPStateStats(StringifyMixin):
def __init__(self, table_id=None, dur_sec=None, dur_nsec=None, field_count=None, fields=None,
entry=None,length=None, hard_rb=None, idle_rb=None, hard_to=None, idle_to=None):
super(OFPStateStats, self).__init__()
self.length = 0
self.table_id = table_id
self.dur_sec = dur_sec
self.dur_nsec = dur_nsec
self.field_count = field_count
self.fields = fields
self.entry = entry
self.hard_to = hard_to
self.hard_rb = hard_rb
self.idle_to = idle_to
self.hard_rb = hard_rb
@classmethod
def parser(cls, msg, offset=0):
state_stats_list = []
buf = msg.body.data
while len(buf)-offset > 0:
state_stats = cls()
(state_stats.length, state_stats.table_id, state_stats.key_len, state_stats.dur_sec,
state_stats.dur_nsec, state_stats.hard_rb, state_stats.idle_rb,state_stats.hard_to,
state_stats.idle_to, state_stats.state) = struct.unpack_from(
bebaproto.OFP_STATE_STATS_PACK_STR, buf, offset)
offset += bebaproto.OFP_STATE_STATS_SIZE
if state_stats.table_id not in msg.datapath.lookup_scope:
continue
state_stats.fields = msg.datapath.lookup_scope[state_stats.table_id]
state_stats.field_count = len(state_stats.fields)
state_stats.entry, offset = OFPStateEntry.parser(buf, offset, state_stats.key_len, state_stats.state)
state_stats_list.append(state_stats)
return state_stats_list
class OFPStateStatsShort(StringifyMixin):
def __init__(self, table_id=None, dur_sec=None, dur_nsec=None, field_count=None, fields=None,
entry=None, length=None, hard_rb=None, idle_rb=None, hard_to=None, idle_to=None):
super(OFPStateStatsShort, self).__init__()
self.length = 0
self.table_id = table_id
self.dur_sec = dur_sec
self.dur_nsec = dur_nsec
self.field_count = field_count
self.fields = fields
self.entry = entry
self.hard_to = hard_to
self.hard_rb = hard_rb
self.idle_to = idle_to
self.hard_rb = hard_rb
@classmethod
def parser(cls, msg, offset=0):
state_stats_list = []
buf = msg.body.data
while len(buf) - offset > 0:
state_stats = cls()
(state_stats.length, state_stats.table_id, state_stats.key_len, state_stats.state) = struct.unpack_from(
bebaproto.OFP_STATE_STATS_SHORT_PACK_STR, buf, offset)
offset += bebaproto.OFP_STATE_STATS_SHORT_SIZE
if state_stats.table_id not in msg.datapath.lookup_scope:
continue
state_stats.fields = msg.datapath.lookup_scope[state_stats.table_id]
state_stats.field_count = len(state_stats.fields)
state_stats.entry, offset = OFPStateEntry.parser(buf, offset, state_stats.key_len, state_stats.state)
state_stats_list.append(state_stats)
return state_stats_list
class OFPGlobalStateStats(StringifyMixin):
def __init__(self, global_state=None):
super(OFPGlobalStateStats, self).__init__()
self.global_state = global_state
@classmethod
def parser(cls, buf, offset):
global_state_stats = cls()
(global_state_stats.global_state, ) = struct.unpack_from('!4xI', buf, offset)
return global_state_stats
def get_field_string(field,key,key_count,offset):
if field==ofproto.OXM_OF_IN_PORT:
if key_count!=0:
length = 4
value = struct.unpack('<I', array('B',key[offset:offset+length]))[0]
return ("in_port=\"%d\""%(value),length)
else:
return ("in_port=*",0)
elif field==ofproto.OXM_OF_IN_PHY_PORT:
if key_count!=0:
length = 4
VLAN_VID_MASK = 0x0fff
value = struct.unpack('<I', array('B',key[offset:offset+length]))[0] & VLAN_VID_MASK
return ("in_phy_port=\"%d\""%(value),length)
else:
return ("in_phy_port=*",0)
elif field==ofproto.OXM_OF_VLAN_VID:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("vlan_vid=\"%d\""%(value),length)
else:
return ("vlan_vid=*",0)
elif field==ofproto.OXM_OF_VLAN_PCP:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0] & 0x7
return ("vlan_pcp=\"%d\""%(value),length)
else:
return ("vlan_pcp=*",0)
elif field==ofproto.OXM_OF_ETH_TYPE:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("eth_type=\"%d\""%(value),length)
else:
return ("eth_type=*",0)
elif field==ofproto.OXM_OF_TCP_SRC:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("tcp_src=\"%d\""%(value),length)
else:
return ("tcp_src=*",0)
elif field==ofproto.OXM_OF_TCP_DST:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("tcp_dst=\"%d\""%(value),length)
else:
return ("tcp_dst=*",0)
elif field==ofproto.OXM_OF_TCP_FLAGS:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("tcp_flags=\"%d\""%(value),length)
else:
return ("tcp_flags=*",0)
elif field==ofproto.OXM_OF_UDP_SRC:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("udp_src=\"%d\""%(value),length)
else:
return ("udp_src=*",0)
elif field==ofproto.OXM_OF_UDP_DST:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("udp_dst=\"%d\""%(value),length)
else:
return ("udp_dst=*",0)
elif field==ofproto.OXM_OF_SCTP_SRC:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("sctp_src=\"%d\""%(value),length)
else:
return ("sctp_src=*",0)
elif field==ofproto.OXM_OF_SCTP_DST:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("sctp_dst=\"%d\""%(value),length)
else:
return ("sctp_dst=*",0)
elif field==ofproto.OXM_OF_ETH_SRC:
if key_count!=0:
length = 6
return ("eth_src=\"%02x:%02x:%02x:%02x:%02x:%02x\""%(key[offset],key[offset+1],key[offset+2],key[offset+3],key[offset+4],key[offset+5]),length)
else:
return ("eth_src=*",0)
elif field==ofproto.OXM_OF_ETH_DST:
if key_count!=0:
length = 6
return ("eth_dst=\"%02x:%02x:%02x:%02x:%02x:%02x\""%(key[offset],key[offset+1],key[offset+2],key[offset+3],key[offset+4],key[offset+5]),length)
else:
return ("eth_dst=*",0)
elif field==ofproto.OXM_OF_IPV4_SRC:
if key_count!=0:
length = 4
return ("ipv4_src=\"%d.%d.%d.%d\""%(key[offset],key[offset+1],key[offset+2],key[offset+3]),length)
else:
return ("ipv4_src=*",0)
elif field==ofproto.OXM_OF_IPV4_DST:
if key_count!=0:
length = 4
return ("ipv4_dst=\"%d.%d.%d.%d\""%(key[offset],key[offset+1],key[offset+2],key[offset+3]),length)
else:
return ("ipv4_dst=*",0)
elif field==ofproto.OXM_OF_IP_PROTO:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0]
return ("ip_proto=\"%d\""%(value),length)
else:
return ("ip_proto=*",0)
elif field==ofproto.OXM_OF_IP_DSCP:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0] & 0x3f
return ("ip_dscp=\"%d\""%(value),length)
else:
return ("ip_dscp=*",0)
elif field==ofproto.OXM_OF_IP_ECN:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0] & 0x3
return ("ip_ecn=\"%d\""%(value),length)
else:
return ("ip_ecn=*",0)
elif field==ofproto.OXM_OF_ICMPV4_TYPE:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0]
return ("icmpv4_type=\"%d\""%(value),length)
else:
return ("icmpv4_type=*",0)
elif field==ofproto.OXM_OF_ICMPV4_CODE:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0]
return ("icmpv4_code=\"%d\""%(value),length)
else:
return ("icmpv4_code=*",0)
elif field==ofproto.OXM_OF_ARP_SHA:
if key_count!=0:
length = 6
return ("arp_sha=\"%02x:%02x:%02x:%02x:%02x:%02x\""%(key[offset],key[offset+1],key[offset+2],key[offset+3],key[offset+4],key[offset+5]),length)
else:
return ("arp_sha=*",0)
elif field==ofproto.OXM_OF_ARP_THA:
if key_count!=0:
length = 6
return ("arp_tha=\"%02x:%02x:%02x:%02x:%02x:%02x\""%(key[offset],key[offset+1],key[offset+2],key[offset+3],key[offset+4],key[offset+5]),length)
else:
return ("arp_tha=*",0)
elif field==ofproto.OXM_OF_ARP_SPA:
if key_count!=0:
length = 4
return ("arp_spa=\"%d.%d.%d.%d\""%(key[offset],key[offset+1],key[offset+2],key[offset+3]),length)
else:
return ("arp_spa=*",0)
elif field==ofproto.OXM_OF_ARP_TPA:
if key_count!=0:
length = 4
return ("arp_tpa=\"%d.%d.%d.%d\""%(key[offset],key[offset+1],key[offset+2],key[offset+3]),length)
else:
return ("arp_tpa=*",0)
elif field==ofproto.OXM_OF_ARP_OP:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("arp_op=\"%d\""%(value),length)
else:
return ("arp_op=*",0)
elif field==ofproto.OXM_OF_IPV6_SRC:
if key_count!=0:
length = 16
value = []
for q in range(8):
value[q]=format(struct.unpack('<H', array('B',key[offset:offset+2]))[0],'x')
offset += 2
return ("nw_src_ipv6=\"%s:%s:%s:%s:%s:%s:%s:%s\""%(value[0],value[1],value[2],value[3],value[4],value[5],value[6],value[7]),length)
else:
return ("nw_src_ipv6=*",0)
elif field==ofproto.OXM_OF_IPV6_DST:
if key_count!=0:
length = 16
value = []
for q in range(8):
value.append(format(struct.unpack('<H', array('B',key[offset:offset+2]))[0],'x'))
offset += 2
return ("nw_dst_ipv6=\"%s:%s:%s:%s:%s:%s:%s:%s\""%(value[0],value[1],value[2],value[3],value[4],value[5],value[6],value[7]),length)
else:
return ("nw_dst_ipv6=*",0)
elif field==ofproto.OXM_OF_IPV6_ND_TARGET:
if key_count!=0:
length = 16
value = []
for q in range(8):
value[q]=format(struct.unpack('<H', array('B',key[offset:offset+2]))[0],'x')
offset += 2
return ("ipv6_nd_target=\"%s:%s:%s:%s:%s:%s:%s:%s\""%(value[0],value[1],value[2],value[3],value[4],value[5],value[6],value[7]),length)
else:
return ("ipv6_nd_target=*",0)
elif field==ofproto.OXM_OF_IPV6_ND_SLL:
if key_count!=0:
length = 6
return ("ipv6_nd_sll=\"%02x:%02x:%02x:%02x:%02x:%02x\""%(key[offset],key[offset+1],key[offset+2],key[offset+3],key[offset+4],key[offset+5]),length)
else:
return ("ipv6_nd_sll=*",0)
elif field==ofproto.OXM_OF_IPV6_ND_TLL:
if key_count!=0:
length = 6
return ("ipv6_nd_tll=\"%02x:%02x:%02x:%02x:%02x:%02x\""%(key[offset],key[offset+1],key[offset+2],key[offset+3],key[offset+4],key[offset+5]),length)
else:
return ("ipv6_nd_tll=*",0)
elif field==ofproto.OXM_OF_IPV6_FLABEL:
if key_count!=0:
length = 4
value = struct.unpack('<I', array('B',key[offset:offset+length]))[0] & 0x000fffff
return ("ipv6_flow_label=\"%d\""%(value),length)
else:
return ("ipv6_flow_label=*",0)
elif field==ofproto.OXM_OF_ICMPV6_TYPE:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0]
return ("icmpv6_type=\"%d\""%(value),length)
else:
return ("icmpv6_type=*",0)
elif field==ofproto.OXM_OF_ICMPV6_CODE:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0]
return ("icmpv6_code=\"%d\""%(value),length)
else:
return ("icmpv6_code=*",0)
elif field==ofproto.OXM_OF_MPLS_LABEL:
if key_count!=0:
length = 4
value = struct.unpack('<I', array('B',key[offset:offset+length]))[0] & 0x000fffff
return ("mpls_label=\"%d\""%(value),length)
else:
return ("mpls_label=*",0)
elif field==ofproto.OXM_OF_MPLS_TC:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0] & 0x3
return ("mpls_tc=\"%d\""%(value),length)
else:
return ("mpls_tc=*",0)
elif field==ofproto.OXM_OF_MPLS_BOS:
if key_count!=0:
length = 1
value = struct.unpack('<B', array('B',key[offset:offset+length]))[0] & 0x1
return ("mpls_bos=\"%d\""%(value),length)
else:
return ("mpls_bos=*",0)
elif field==ofproto.OXM_OF_PBB_ISID:
if key_count!=0:
length = 4
value = struct.unpack('<I', array('B',key[offset:offset+length]))[0]
return ("pbb_isid=\"%d\""%(value),length)
else:
return ("pbb_isid=*",0)
elif field==ofproto.OXM_OF_TUNNEL_ID:
if key_count!=0:
length = 8
value = struct.unpack('<Q', array('B',key[offset:offset+length]))[0]
return ("tunnel_id=\"%d\""%(value),length)
else:
return ("tunnel_id=*",0)
elif field==ofproto.OXM_OF_IPV6_EXTHDR:
if key_count!=0:
length = 2
value = struct.unpack('<H', array('B',key[offset:offset+length]))[0]
return ("ext_hdr=\"%d\""%(value),length)
else:
return ("ext_hdr=*",0)
def state_entry_key_to_str(state_stats):
offset = 0
s = ''
for field in state_stats.fields[:state_stats.field_count]:
(string,field_len) = get_field_string(field,state_stats.entry.key,state_stats.entry.key_count,offset)
s += string
offset += field_len
if field != state_stats.fields[state_stats.field_count-1]:
s += ","
return s
'''
Global states are 32, numbered from 0 to 31 from right to left
masked_global_state_from_str("0*1100") -> **************************0*1100 -> (12,47)
masked_global_state_from_str("0*1100",12) -> ***************0*1100*********** -> (49152, 192512)
'''
def masked_global_state_from_str(string,offset=0):
import re
str_len=len(string)
if re.search('r[^01*]', string) or str_len>32 or str_len<1:
print("ERROR: global_state string can only contain 0,1 and * and must have at least 1 bit and at most 32 bits!")
return (0,0)
if offset>31 or offset<0:
print("ERROR: offset must be in range 0-31!")
return (0,0)
if str_len+offset>32:
print("ERROR: offset is too big")
return (0,0)
mask=['0']*32
value=['0']*32
for i in range(offset,str_len+offset):
if not string[str_len-1+offset-i]=="*":
mask[31-i]="1"
value[31-i]=string[str_len-1+offset-i]
mask=''.join(mask)
value=''.join(value)
return (int(value,2),int(mask,2))
'''
state field is 32bit long
Thanks to the mask we can divide the field in multiple substate matchable with masks.
substate(state,section,sec_count)
state = state to match
section = number of the selected subsection (starts from 1 from the right)
sec_count = number of how many subsection the state field has been divided
substate(5,2,4) -> |********|********|00000101|********|-> (1280,16711680)
'''
def substate(state,section,sec_count):
if not isinstance(state, int) or not isinstance(section, int) or not isinstance(sec_count, int):
print("ERROR: parameters must be integers!")
return(0,0)
if state < 0 or section < 0 or sec_count < 0:
print("ERROR: parameters must be positive!")
return(0,0)
if 32%sec_count != 0:
print("ERROR: the number of sections must be a divisor of 32")
return(0,0)
section_len = 32/sec_count
if state >= pow(2,section_len):
print("ERROR: state exceed the section's length")
return(0,0)
if section not in range (1,sec_count+1):
print("ERROR: section not exist. It must be between 1 and sec_count")
return(0,0)
sec_count = sec_count -1
count = 1
starting_point = section*section_len
mask=['0']*32
value=['0']*32
bin_state=['0']*section_len
state = bin(state)
state = ''.join(state[2:])
for i in range(0,len(state)):
bin_state [section_len-1-i]= state[len(state)-1-i]
for i in range(starting_point,starting_point+section_len):
value[31-i]=bin_state[section_len - count]
count = count + 1
mask[31-i]="1"
mask=''.join(mask)
value=''.join(value)
return (int(value,2),int(mask,2))
###############################################################################################################################
'''
[Beba to Open vSwitch wrapper]
An Beba application can be run by an Open vSwitch softswitch without Beba support by adding
'@Beba2OVSWrapper' just before def switch_features_handler(self, ev), after '@set_ev_cls()'
$ sudo mn --topo single,4 --mac --switch ovsk --controller remote ---> starts Open vSwitch (OpenFlow only)
$ sudo mn --topo single,4 --mac --switch user --controller remote ---> starts ofsoftswitch13 (OpenFlow + Beba)
$ ryu-manager [app_name]
How stuff works:
we need to intercept any message containing Beba code (Beba messages, FlowMod matching on 'state', FlowMod containing
SetState action, ...). The best way is intercepting any call to send_msg() in order to filter/modify/drop the outgoing message.
We don't want to touch Ryu code and we'd like minimal modifications to Beba applications code.
send_msg() is a method from Datapath class, so we need to extend it to override send_msg().
The Datapath object 'datapath' should be casted to a OVSDatapath object and the best moment is when the controller
communicates with the switch for the first time (so in switch_features_handler()).
We want to cast the object just before the execution of the user-defined handler, so we can use a decorator to execute some
additional code before the user-defined function. A decorator is a function that takes a function object as an argument, and
returns a function object as a return value.
'''
from ryu.controller.controller import Datapath
from sets import Set
'''
OVSDatapath class inherits Datapath class to override send_msg() method in order to intercept and adapt Beba messages.
Finally the original send_msg() is called, when appropriate (e.g. messages OFPExpMsgConfigureStatefulTable and OFPExpMsgKeyExtract
just update OVSDatapath internal state withtout being sent to the switch)
'''
class OVSDatapath(Datapath):
def send_msg(self, msg):
'''
In Beba a stateful stage has a state table and a flow table with the same table_id.
In Open vSwitch a stateful stage has two separated flow tables with adjacent table_ids
'''
def get_state_table_id(table_id):
return 2*table_id
def get_flow_table_id(table_id):
return 2*table_id+1
if isinstance(msg,ofproto_parser.OFPExperimenter) and msg.experimenter==0xBEBABEBA and msg.exp_type==bebaproto.OFPT_EXP_STATE_MOD:
# We are forced to unpack because OFPExpMsgConfigureStatefulTable is not a class with attributes; for simplicity it's a
# method returning an instance of OFPExperimenter with the packed payload (refactoring!?!)
command_offset = struct.calcsize(bebaproto.OFP_EXP_STATE_MOD_PACK_STR)
(command,) = struct.unpack(bebaproto.OFP_EXP_STATE_MOD_PACK_STR, msg.data[:command_offset])
if command == bebaproto.OFPSC_EXP_STATEFUL_TABLE_CONFIG:
(table_id,stateful) = struct.unpack(bebaproto.OFP_EXP_STATE_MOD_STATEFUL_TABLE_CONFIG_PACK_STR, msg.data[command_offset:command_offset+struct.calcsize(bebaproto.OFP_EXP_STATE_MOD_STATEFUL_TABLE_CONFIG_PACK_STR)])
# "control flow" table miss in State Table
# OVS have all port numbers into the 16-bit range (like in OF1.0), while later OF version use 32-bit port numbers.
# NXActionResubmitTable needs 16-bit port numbers, so we cannot put ofproto.OFPP_IN_PORT: we put 0xfff8 (OFPP_IN_PORT=0xfff8 in OF1.0)
# https://github.com/openvswitch/ovs/blob/master/OPENFLOW-1.1%2B.md
match = ofproto_parser.OFPMatch(reg1=0)
actions = [ofproto_parser.OFPActionSetField(reg1=1),
ofproto_parser.NXActionResubmitTable(0xfff8,get_state_table_id(table_id)),
ofproto_parser.NXActionResubmitTable(0xfff8,get_flow_table_id(table_id))]
inst = [ofproto_parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
mod = ofproto_parser.OFPFlowMod(datapath=self, table_id=get_state_table_id(table_id), priority=10, match=match, instructions=inst)
super(OVSDatapath, self).send_msg(mod)
# "return DEFAULT state" in State Table
match = ofproto_parser.OFPMatch(reg1=1)
actions = [ofproto_parser.OFPActionSetField(reg0=0)]
inst = [ofproto_parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
mod = ofproto_parser.OFPFlowMod(datapath=self, table_id=get_state_table_id(table_id), priority=10, match=match, instructions=inst)
super(OVSDatapath, self).send_msg(mod)
# keep track of stateful stages (useful when handling GotoTable instructions)
self.stateful_stages_in_use.add(table_id)
# OFPExpMsgConfigureStatefulTable msg is dropped
return
elif command == bebaproto.OFPSC_EXP_SET_L_EXTRACTOR or command == bebaproto.OFPSC_EXP_SET_U_EXTRACTOR:
(table_id,field_count) = struct.unpack(bebaproto.OFP_EXP_STATE_MOD_EXTRACTOR_PACK_STR,msg.data[command_offset:command_offset+struct.calcsize(bebaproto.OFP_EXP_STATE_MOD_EXTRACTOR_PACK_STR)])
if field_count>0:
fields_offset = command_offset+struct.calcsize(bebaproto.OFP_EXP_STATE_MOD_EXTRACTOR_PACK_STR)
field_size = struct.calcsize('!I')
if command == bebaproto.OFPSC_EXP_SET_L_EXTRACTOR:
self.lookup_scope[table_id] = []
for f in range(field_count):
current_field_offset = fields_offset+field_size*f
self.lookup_scope[table_id].append( struct.unpack('!I',msg.data[current_field_offset : current_field_offset+field_size])[0] )
elif command == bebaproto.OFPSC_EXP_SET_U_EXTRACTOR:
self.update_scope[table_id] = []
for f in range(field_count):
current_field_offset = fields_offset+field_size*f
self.update_scope[table_id].append( struct.unpack('!I',msg.data[current_field_offset : current_field_offset+field_size])[0] )
else:
LOG.debug("ERROR: no fields in lookup/update scope!")
# OFPExpMsgKeyExtract msg is dropped
return
elif command == bebaproto.OFPSC_EXP_SET_FLOW_STATE:
# We should send a FlowMod MODIFY by converting 'keys' into FlowMod's match fields and 'state' into OFPActionSetField(reg0=state) '''
'''
TODO: timeouts handling. Up to now timeouts are ignored (see comments below in OFPAT_EXP_SET_STATE)
TODO: 'state_mask' handling
Until now 'state_mask' is ignored because in OF1.3 SetField actions does not allow mask (only OF1.5 allows it with EXT-314)
In fact ovs-ofctl translates a set_field into a reg_load when we force OF version to 1.3.
sudo ovs-ofctl add-flow s1 -O OpenFlow13 "table=0 action=set_field:1/5->reg0" --> actions=load:0x1->NXM_NX_REG0[0],load:0->NXM_NX_REG0[2]
sudo ovs-ofctl add-flow s1 -O OpenFlow13 "table=0 action=set_field:1->reg0" --> actions=set_field:0x1->reg0
Seacrh for "set_field:value[/mask]->dst" in http://openvswitch.org/support/dist-docs/ovs-ofctl.8.txt
Ryu API for OF1.3 does not include anymore NXActionRegLoad. If state_mask is 0xFFFFFFFF we can use set_field, otherwise
we need another strategy. Maybe porting NXActionRegLoad from OF1.0?
'''
(table_id, key_count, state, state_mask, hard_rollback, idle_rollback, hard_timeout, idle_timeout) = struct.unpack(bebaproto.OFP_EXP_STATE_MOD_SET_FLOW_STATE_PACK_STR, msg.data[command_offset:command_offset+struct.calcsize(bebaproto.OFP_EXP_STATE_MOD_SET_FLOW_STATE_PACK_STR)])
if key_count>0:
lookup_fields = {}
key_starting_offset = command_offset+struct.calcsize(bebaproto.OFP_EXP_STATE_MOD_SET_FLOW_STATE_PACK_STR)
key_offset = 0
# Parse the remaning payload to get the matching values of all lookup fields
for f in self.lookup_scope[table_id]:
field_bytes_num = ofproto_parser.OFPMatchField._FIELDS_HEADERS[f](f,0,0).oxm_len()
# if f is ofproto.OXM_OF_ETH_SRC then field_name would be 'eth_dst'
field_name = ofproto_parser._NXFlowSpec._parse_subfield( bytearray(struct.pack('!IH',f,0)) )[0]
key = list(struct.unpack('!'+'B'*field_bytes_num, msg.data[key_starting_offset+key_offset:key_starting_offset+key_offset+field_bytes_num]))
# We'd like something like lookup_fields['eth_dst']='00:00:00:0a:0a:0a'
lookup_fields[field_name] = self.bytes_to_match_value(f,key)
key_offset += field_bytes_num
self.add_prereq_match_to_dict(self.lookup_scope[table_id],lookup_fields)
match = ofproto_parser.OFPMatch(reg1=1,**lookup_fields)
actions = [ofproto_parser.OFPActionSetField(reg1=0),ofproto_parser.OFPActionSetField(reg0=state)]
inst = [ofproto_parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
mod = ofproto_parser.OFPFlowMod(datapath=self, cookie=0, cookie_mask=0,table_id=get_state_table_id(table_id),
command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0, priority=100, buffer_id=ofproto.OFP_NO_BUFFER,
out_port=ofproto.OFPP_ANY, out_group=ofproto.OFPG_ANY, match=match, instructions=inst)
super(OVSDatapath, self).send_msg(mod)
else:
LOG.debug("ERROR: empty key in STATE_MOD message!")
return
elif command == bebaproto.OFPSC_EXP_DEL_FLOW_STATE:
# We should send a FlowMod DELETE by converting 'keys' into FlowMod's match fields
(table_id, key_count) = struct.unpack(bebaproto.OFP_EXP_STATE_MOD_DEL_FLOW_STATE_PACK_STR, msg.data[command_offset:command_offset+struct.calcsize(bebaproto.OFP_EXP_STATE_MOD_DEL_FLOW_STATE_PACK_STR)])
if key_count>0:
lookup_fields = {}
key_starting_offset = command_offset+struct.calcsize(bebaproto.OFP_EXP_STATE_MOD_DEL_FLOW_STATE_PACK_STR)
key_offset = 0
# Parse the remaning payload to get the matching values of all lookup fields
for f in self.lookup_scope[table_id]:
field_bytes_num = ofproto_parser.OFPMatchField._FIELDS_HEADERS[f](f,0,0).oxm_len()
# if f is ofproto.OXM_OF_ETH_SRC then field_name would be 'eth_dst'
field_name = ofproto_parser._NXFlowSpec._parse_subfield( bytearray(struct.pack('!IH',f,0)) )[0]
key = list(struct.unpack('!'+'B'*field_bytes_num, msg.data[key_starting_offset+key_offset:key_starting_offset+key_offset+field_bytes_num]))
# We'd like something like lookup_fields['eth_dst']='00:00:00:0a:0a:0a'
lookup_fields[field_name] = self.bytes_to_match_value(f,key)
key_offset += field_bytes_num
self.add_prereq_match_to_dict(self.lookup_scope[table_id],lookup_fields)
match = ofproto_parser.OFPMatch(reg1=1,**lookup_fields)
mod = ofproto_parser.OFPFlowMod(datapath=self, cookie=0, cookie_mask=0,table_id=get_state_table_id(table_id),
command=ofproto.OFPFC_DELETE, idle_timeout=0, hard_timeout=0, priority=100, buffer_id=ofproto.OFP_NO_BUFFER,
out_port=ofproto.OFPP_ANY, out_group=ofproto.OFPG_ANY, match=match)
super(OVSDatapath, self).send_msg(mod)
else:
LOG.debug("ERROR: empty key in STATE_MOD message!")
return
elif command == bebaproto.OFPSC_EXP_SET_GLOBAL_STATE:
''' TODO: global states could be implemented by prepending a stage with just one table miss entry that sets reg8=global state value.
We should send a FlowMod ADD. NB get_state_table_id() and get_flow_table_id() return value should be sincreased by 1 '''
return
elif command == bebaproto.OFPSC_EXP_RESET_GLOBAL_STATE:
''' TODO: We could send a FlowMod MOD that sets reg8=0 (or that just do GotoTable(1) ) in the table miss entry'''
return
elif isinstance(msg,ofproto_parser.OFPExperimenterStatsRequest) and msg.experimenter==0xBEBABEBA:
if msg.exp_type==bebaproto.OFPMP_EXP_STATE_STATS:
''' TODO: In Open vSwitch the state table is a simple flow table => we could send a OFPMultipartRequest, maybe '''
elif msg.exp_type==bebaproto.OFPMP_EXP_GLOBAL_STATE_STATS:
''' TODO: in Open vSwitch, global states are a flow entry in the first table => we could send a OFPMultipartRequest, maybe '''
elif msg.exp_type==bebaproto.OFPMP_EXP_STATE_STATS_AND_DELETE:
''' TODO '''
return
elif isinstance(msg,ofproto_parser.OFPFlowMod):
# [step 1 ] check for the presence of any Beba action in OFPInstructionActions
for instr in msg.instructions:
if isinstance(instr, ofproto_parser.OFPInstructionActions) and instr.type in [ofproto.OFPIT_WRITE_ACTIONS , ofproto.OFPIT_APPLY_ACTIONS]:
filtered_action_set = []
for act in instr.actions:
if isinstance(act, ofproto_parser.OFPActionExperimenterUnknown) and act.experimenter == 0xBEBABEBA:
(act_type,) = struct.unpack('!I', act.data[:struct.calcsize('!I')])
if act_type == bebaproto.OFPAT_EXP_SET_STATE:
(act_type, state, state_mask, table_id, hard_rollback, idle_rollback, hard_timeout, idle_timeout) = struct.unpack(bebaproto.OFP_EXP_ACTION_SET_STATE_PACK_STR, act.data[:struct.calcsize(bebaproto.OFP_EXP_ACTION_SET_STATE_PACK_STR)])
''' TODO: timeouts handling. Up to now timeouts are ignored because OF flow entry's timeouts can be set only when a flow entry is added! (e.g. created for the first time) '''
''' TODO: multiple rollback states
Rollback state!=0 could be supported with 2 learn actions, one with high priority (say 200) with the user-defined timeout and load:state->reg0,
the other with the classic priority 100, no timeouts and load:rollback->reg0. But how can we manage a state transitions with 2 (I/H) possible rollbacks? '''
specs = [ofproto_parser.NXFlowSpecMatch(dst=('reg1', 0),n_bits=32,src=1),
ofproto_parser.NXFlowSpecLoad(dst=('reg1',0),n_bits=32,src=0)]
specs.extend(self.generate_NXFlowSpecMatch_and_prereq(table_id))
specs.extend(self.generate_NXFlowSpecLoad(state,state_mask))
learn_action = ofproto_parser.NXActionLearn(table_id=get_state_table_id(table_id),priority=100,
specs=specs)
filtered_action_set.append(learn_action)
elif act_type == bebaproto.OFPAT_EXP_SET_GLOBAL_STATE:
''' TODO we could add an action learn() that install a flow entry in table 0 which sets reg8=global state value, with mask '''
else:
# non-Beba actions are left unchanged