Hi,
I have been trying to send a Flow Mod Message to the Openflow stack which sets
a masked IP address. However, on the OF side no mask is present in the received
message. How do I go about correctly setting the mask for this field?
Code:
def add_flow(self, datapath, in_port, dst, priority, actions, match, inst,
cookie=0):
ofproto = datapath.ofproto
ofproto_par = datapath.ofproto_parser
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath,
cookie=cookie,
cookie_mask=0,
table_id=0,
command=ofproto.OFPFC_ADD,
idle_timeout=0,
hard_timeout=0,
priority=priority,
buffer_id=0xffffffff,
out_port=0,
out_group=0,
flags=ofproto.OFPFF_CHECK_OVERLAP,
match=match,
instructions=inst)
datapath.send_msg(mod)
# Send Flow Mod Once an Echo Reply has been received
@set_ev_cls(ofp_event.EventOFPEchoReply, MAIN_DISPATCHER)
def rxEchoReply(self, ev):
datapath = ev.msg.datapath
################
# Start tests
self.createFlows(datapath)
time.sleep(1)
raw_input("Press Enter to delete")
self.deleteFlows(datapath)
# End tests
################
self.async_get(datapath)
def createFlows(self, datapath):
ofp = datapath.ofproto
ofproto_par = datapath.ofproto_parser
type_ = datapath.ofproto.OXM_OF_IPV4_SRC
value = iptoint('192.168.2.1')
f1 = ofproto_par.OFPMatchField.make(type_,value)
actions = [ofproto_par.OFPActionSetField(f1),
ofproto_par.OFPActionOutput(1,1600)]
inst = [ofproto_par.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS,
actions)]
dst = "ab:cd:ef:12:34:56"
pri = 1
match = ofproto_par.OFPMatch()
match.set_dl_type(0x800)
match.set_ipv4_src(value)
self.add_flow(datapath, 1, dst, pri, actions, match, inst,
cookie=0xdead)
type_ = datapath.ofproto.OXM_OF_IPV4_SRC
value = iptoint('192.169.2.1')
mask = self.get_ip_mask_from_prefix_length(32)
f1 = ofproto_par.OFPMatchField.make(type_,value)
actions = [ofproto_par.OFPActionSetField(f1),
ofproto_par.OFPActionOutput(1,1600)]
inst = [ofproto_par.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS,
actions)]
dst = "ab:cd:ef:12:34:56"
pri = 1
match = ofproto_par.OFPMatch()
match.set_dl_type(0x800)
match.set_ipv4_src_masked(value, mask)
self.add_flow(datapath, 1, dst, pri, actions, match, inst,
cookie=0xbeef)
def deleteFlows(self, datapath):
ofp = datapath.ofproto
ofproto_par = datapath.ofproto_parser
type_ = datapath.ofproto.OXM_OF_IPV4_SRC_W
mask = self.get_ip_mask_from_prefix_length(32)
ip = iptoint('192.168.2.1')
f1 = ofproto_par.MTIPV4Src.make(type_,ip,mask)
actions = [ofproto_par.OFPActionSetField(f1),
ofproto_par.OFPActionOutput(1,1600)]
inst = [ofproto_par.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS,
actions)]
dst = "ab:cd:ef:12:34:56"
pri = 1
match = ofproto_par.OFPMatch()
match.set_dl_type(0x800)
match.set_ipv4_src_masked(ip, mask)
self.delete_flow(datapath, 1, dst, pri, actions, match, inst,
cookie=0xdead)
I have done some debugging on the Openflow side and I can see that the incoming
message has the correct match field data set (192.168.2.1), but the mask field
is 0 (and the oxm header flag is also 0).
Any help you can offer is much appreciated.
Thanks,
Adam Humphreys
Reception : +44 (0)28 9072 5000
Fax : +44 (0)28 9072 5001
www.asidua.com
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