def switch_handler(self, address, fd, events):
if events & io_loop.READ:
data = self.sock_sw.recv(1024)
if data == '':
print "switch disconnected"
io_loop.remove_handler(self.fd_sw)
print "closing connection to controller"
self.sock_con.close()
io_loop.remove_handler(self.fd_con)
else:
rmsg = of.ofp_header(data[0:8])
if rmsg.type == 6:
print "OFPT_FEATURES_REPLY" #Actually,we just need to change here.
header = of.ofp_header(data[0:8])
print "ofp_features_reply.xid ", header.xid
msg = of.ofp_features_reply(data[8:32]) #all sw type should make the convertion. Because our protocol need to use in all nets.
msg_port = data[32:]
msg = header/msg/msg_port
self.dpid=msg.datapath_id #record the dpid
data = convert.of2ofc(msg, self.buffer, self.dpid)
elif rmsg.type == 10:
pkt_in_msg = of.ofp_packet_in(data[8:18])
pkt_parsed = of.Ether(data[18:])
self.counter+=1
#[port + id+ dpid] --> [buffer_id + pkt_in_msg]
if isinstance(pkt_parsed.payload, of.IP) or isinstance(pkt_parsed.payload.payload, of.IP):
self.buffer[(pkt_in_msg.in_port, self.counter, self.dpid)] = [pkt_in_msg.buffer_id, rmsg/pkt_in_msg/pkt_parsed] # bind buffer id with in port
rmsg.xid = self.counter # use the counter to check the buffer
data = rmsg/pkt_in_msg/pkt_parsed
elif rmsg.type ==11:
match = ofc.ofp_match(data[12:48]) #data[8:12]is wildcards
for flow in self.flow_cache:
if match == ofc.ofp_match(str(flow[1])[12:48]):
self.flow_cache.remove(flow) #delete the flow
elif rmsg.type == 17:
print "stats_reply" ,len(data)
body = data[8:]
reply_header = of.ofp_stats_reply(body[:4])
if reply_header.type == 1 and len(data)>91:
reply_body_match = ofc.ofp_match(body[12:48])
reply_body_data2 = ofc.ofp_flow_stats_data(body[48:92])
if reply_body_data2.byte_count == 0 and reply_body_data2.packet_count == 0: #it is a junck flow,delete it!
for flow in self.flow_cache:
if reply_body_match == ofc.ofp_match(str(flow[1])[12:48]):
self.flow_cache.remove(flow)
io_loop.update_handler(self.fd_con, io_loop.WRITE)
self.queue_con.put(str(data))
if events & io_loop.WRITE:
try:
next_msg = self.queue_sw.get_nowait()
except Queue.Empty:
#print "%s queue empty" % str(address)
io_loop.update_handler(self.fd_sw, io_loop.READ)
else:
#print 'sending "%s" to %s' % (of.ofp_type[of.ofp_header(next_msg).type], self.sock_sw.getpeername())
self.sock_sw.send(next_msg)
def stats_reply_handler(data, *arg):
#print ">>>OFPT_STATS_REPLY:%d",len(data)
rmsg = of.ofp_header(data[0:8])
body = data[8:]
# 1. parsing ofp_stats_reply
reply_header = of.ofp_stats_reply(body[:4])
#reply_header.show()
# 2.parsing ofp_flow_stats msg
if reply_header.type == 0:
reply_desc = of.ofp_desc_stats(body[4:])
reply.show()
elif reply_header.type == 1 and len(data) > 92:
reply_body_data1 = of.ofp_flow_stats(body[4:8])
reply_body_data1.show()
# match field in ofp_flow_stats
reply_body_wildcards = of.ofp_flow_wildcards(body[8:12])
reply_body_match = of.ofp_match(body[12:48])
# second part in ofp_flow_stats
reply_body_data2 = of.ofp_flow_stats_data(body[48:92])
# 3.parsing actions
reply_body_action = []
if len(body[92:]) > 8: #it is very important!
num = len(body[92:]) / 8
for x in xrange(num):
reply_body_action.append(
of.ofp_action_output(body[92 + x * 8:100 + x * 8]))
msg = reply_header / reply_body_data1 / reply_body_wildcards / reply_body_match / reply_body_data2
msg.show()
elif reply_header.type == 2:
reply_aggregate = of.ofp_aggregate_stats_reply(body[4:])
reply_aggregate.show()
elif reply_header.type == 3:
#table_stats
length = rmsg.length - 12
num = length / 64
for i in xrange(num):
table_body = body[4 + i * 64:i * 64 + 68]
reply_table_stats = of.ofp_table_stats(table_body[:36])
table_wildcards = of.ofp_flow_wildcards(table_body[36:40])
reply_table_stats_data = of.ofp_table_stats_data(table_body[40:64])
msg_tmp = reply_header / reply_table_stats / table_wildcards / reply_table_stats_data
msg = rmsg / msg_tmp
msg.show()
elif reply_header.type == 4:
#port stats reply
length = rmsg.length - 12
num = length / 104
for i in xrange(num):
offset = 4 + i * 104
reply_port_stats = of.ofp_port_stats_reply(body[offset:(offset +
104)])
msg_tmp = reply_header / reply_port_stats
msg = rmsg / msg_tmp
msg.show()
elif reply_header.type == 5:
#queue reply
length = rmsg.length - 12
num = length / 32
if num: #if the queue is empty ,you need to check it !
for i in xrange(num):
offset = 4 + i * 32
queue_reply = of.ofp_queue_stats(body[offset:offset + 32])
msg_tmp = reply_header / queue_reply
msg = rmsg / msg_tmp
msg.show()
elif reply_header.type == 0xffff:
#vendor reply
msg = rmsg / reply_header / of.ofp_vendor(body[4:])
return None
def client_handler(address, fd, events):
sock = fd_map[fd]
#print sock, sock.getpeername(), sock.getsockname()
if events & io_loop.READ:
data = sock.recv(1024)
if data == '':
"""
According to stackoverflow(http://stackoverflow.com/questions/667640/how-to-tell-if-a-connection-is-dead-in-python)
When a socket is closed, the server will receive a EOF. In python, however, server will
receive a empty string(''). So, when a switch disconnected, the server will find out
at once. But, if you do not react on this incident, there will be always a ``ioloop.read``
event. And the loop will run forever, thus, the CPU useage will be pretty high.
"""
print "connection dropped"
io_loop.remove_handler(fd)
if len(data)<8:
print "not a openflow message"
else:
#print len(data)
#if the data length is 8, then only of header
#else, there are payload after the header
if len(data)>8:
rmsg = of.ofp_header(data[0:8])
body = data[8:]
else:
rmsg = of.ofp_header(data)
#rmsg.show()
if rmsg.type == 0:
print "OFPT_HELLO"
msg = of.ofp_header(type = 5)
io_loop.update_handler(fd, io_loop.WRITE)
message_queue_map[sock].put(data)
message_queue_map[sock].put(str(msg))
elif rmsg.type == 1:
print "OFPT_ERROR"
elif rmsg.type == 5:
print "OFPT_FEATURES_REQUEST"
elif rmsg.type == 6:
print "OFPT_FEATURES_REPLY"
#print "rmsg.load:",len(body)/48
msg = of.ofp_features_reply(body[0:24])#length of reply msg
#msg.show()
port_info_raw = body[24:]
port_info = {}
print "port number:",len(port_info_raw)/48, "total length:", len(port_info_raw)
for i in range(len(port_info_raw)/48):
#print "port", i, ",len:", len(port_info_raw[0+i*48:48+i*48])
"""The port structure has a length of 48 bytes.
so when receiving port info, first split the list
into port structure length and then analysis
"""
port_info[i] = of.ofp_phy_port(port_info_raw[0+i*48:48+i*48])
#print port_info[i].port_name
#port_info[i].show()
#print port_info[i].OFPPC_PORT_DOWN
elif rmsg.type == 2:
print "OFPT_ECHO_REQUEST"
msg = of.ofp_header(type=3, xid=rmsg.xid)
#test for status request [which is good]
global exe_id
global ofp_match_obj
if exe_id>1:
#len = 8+4+44
stat_req = of.ofp_header(type=16,length=56)\
/of.ofp_stats_request(type=1)\
/of.ofp_flow_wildcards()\
/ofp_match_obj\
/of.ofp_flow_stats_request()
#stat_req.show()
message_queue_map[sock].put(str(msg))
if exe_id>1:
message_queue_map[sock].put(str(stat_req))
io_loop.update_handler(fd, io_loop.WRITE)
#end of test
#io_loop.update_handler(fd, io_loop.WRITE)
#message_queue_map[sock].put(str(msg))
elif rmsg.type == 3:
print "OFPT_ECHO_REPLY"
elif rmsg.type == 4:
print "OFPT_VENDOR"
elif rmsg.type == 6:
print "OFPT_FEATURES_REPLY"
elif rmsg.type == 7:
print "OFPT_GET_CONFIG_REQUEST"
elif rmsg.type == 8:
print "OFPT_GET_CONFIG_REPLY"
elif rmsg.type == 9:
print "OFPT_SET_CONFIG"
elif rmsg.type == 10:
#print "OFPT_PACKET_IN"
#rmsg.show()
pkt_in_msg = of.ofp_packet_in(body)
#pkt_in_msg.show()
raw = pkt_in_msg.load
pkt_parsed = of.Ether(raw)
#pkt_parsed.payload.show()
#print "to see if the payload of ether is IP"
#if isinstance(pkt_parsed.payload, of.IP):
#pkt_parsed.show()
if isinstance(pkt_parsed.payload, of.ARP):
#pkt_parsed.show()
#pkt_out = of.ofp_header()/of.ofp_pktout_header()/of.ofp_action_output()
pkt_out.payload.payload.port = 0xfffb
pkt_out.payload.buffer_id = pkt_in_msg.buffer_id
pkt_out.payload.in_port = pkt_in_msg.in_port
pkt_out.length = 24
#pkt_out.show()
io_loop.update_handler(fd, io_loop.WRITE)
message_queue_map[sock].put(str(pkt_out))
if isinstance(pkt_parsed.payload, of.IP):
if isinstance(pkt_parsed.payload.payload, of.ICMP):
#print "from", pkt_parsed.src, "to", pkt_parsed.dst
"""
When receive a OPF_PACKET_IN message, you can caculate a path, and then
use OFP_FLOW_MOD message to install path. Also, you can find out the exact
port to send the message, then you can use the following code to send a
OFP_PACKET_OUT message and send the packet to destination.
"""
#pkt_parsed.show()
#pkt_out = of.ofp_header()/of.ofp_pktout_header()/of.ofp_action_output()
pkt_out.payload.payload.port = 0xfffb
pkt_out.payload.buffer_id = pkt_in_msg.buffer_id
pkt_out.payload.in_port = pkt_in_msg.in_port
pkt_out.length = 24
"""
io_loop.update_handler(fd, io_loop.WRITE)
message_queue_map[sock].put(str(pkt_out))
"""
#print pkt_parsed.payload.proto
#pkt_parsed.show()
#print "ICMP protocol"
#pkt_out.show()
#usually don't have to fill in ``wilecards`` area
global cookie
global exe_id
exe_id += 1
cookie += 1
flow_mod_msg = of.ofp_header(type=14,
length=80,
xid=exe_id)/\
of.ofp_flow_wildcards()\
/of.ofp_match(in_port=pkt_in_msg.in_port,
dl_src=pkt_parsed.src,
dl_dst=pkt_parsed.dst,
dl_type=pkt_parsed.type,
nw_tos=pkt_parsed.payload.tos,
nw_proto=pkt_parsed.payload.proto,
nw_src=pkt_parsed.payload.src,
nw_dst=pkt_parsed.payload.dst,
tp_src = pkt_parsed.payload.payload.type,
tp_dst = pkt_parsed.payload.payload.code)\
/of.ofp_flow_mod(cookie=cookie,
command=0,
idle_timeout=60,
buffer_id=pkt_in_msg.buffer_id,#icmp type 8: request, 0: reply
flags=1)\
/of.ofp_action_output(type=0,
port=0xfffb,
len=8)
#flow_mod_msg.show()
global ofp_match_obj
ofp_match_obj = of.ofp_match(in_port=pkt_in_msg.in_port,
dl_src=pkt_parsed.src,
dl_dst=pkt_parsed.dst,
dl_type=pkt_parsed.type,
nw_tos=pkt_parsed.payload.tos,
nw_proto=pkt_parsed.payload.proto,
nw_src=pkt_parsed.payload.src,
nw_dst=pkt_parsed.payload.dst,
tp_src = pkt_parsed.payload.payload.type,
tp_dst = pkt_parsed.payload.payload.code)
exe_id += 1
"""
print "--------------------------------------------------------------------------------------"
print "len of flow_mod_msg :", len(str(flow_mod_msg))
print "len of of_header() :", len(str(of.ofp_header()))
print "len of ofp_flow_wildcards():", len(str(of.ofp_flow_wildcards()))
print "len of ofp_match() :", len(str(of.ofp_match()))
print "len of ofp_flow_mod() :", len(str(of.ofp_flow_mod(command=0,idle_timeout=60,buffer_id=pkt_in_msg.buffer_id)))
print "len of ofp_action_output() :", len(str(of.ofp_action_output(type=0,port=0xfffb,len=8)))
print "--------------------------------------------------------------------------------------"
"""
io_loop.update_handler(fd, io_loop.WRITE)
#message_queue_map[sock].put(str(pkt_out))
message_queue_map[sock].put(str(flow_mod_msg))
message_queue_map[sock].put(str(of.ofp_header(type=18,xid=exe_id))) #send a barrier request msg.
elif rmsg.type == 11:
print "OFPT_FLOW_REMOVED"
elif rmsg.type == 12:
print "OFPT_PORT_STATUS"
elif rmsg.type == 13:
print "OFPT_PACKET_OUT"
elif rmsg.type == 14:
print "OFPT_FLOW_MOD"
elif rmsg.type == 15:
print "OFPT_PORT_MOD"
elif rmsg.type == 16:
print "OFPT_STATS_REQUEST"
elif rmsg.type == 17:
print "OFPT_STATS_REPLY"
# 1. parsing ofp_stats_reply
reply_header = of.ofp_stats_reply(body[:4])
# 2.parsing ofp_flow_stats msg
reply_body_data1 = of.ofp_flow_stats(body[4:8])
# match field in ofp_flow_stats
reply_body_wildcards = of.ofp_flow_wildcards(body[8:12])
reply_body_match = of.ofp_match(body[12:48])
# second part in ofp_flow_stats
reply_body_data2 = of.ofp_flow_stats_data(body[48:92])
# 3.parsing actions
# should first judge action type
i = 0
reply_body_action = []
#print len(body[92:])
while i<len(body[92:]):
if body[95+i:96+i]==0x08:
print "0x08"
i+=8
if body[95+i:96+i] == 0x08:
reply_body_action.append(of.ofp_action_output(body[92+i:100+i]))
#i+=8
# 4.show msg
msg = reply_header/reply_body_data1/reply_body_wildcards/reply_body_match/reply_body_data2
msg.show()
print reply_body_action
# no message body
elif rmsg.type == 18:
print "OFPT_BARRIER_REQUEST"
#no message body, the xid is the previous barrier request xid
elif rmsg.type == 19:
print "OFPT_BARRIER_REPLY: ", rmsg.xid, "Successful"
elif rmsg.type == 20:
print "OFPT_QUEUE_GET_CONFIG_REQUEST"
elif rmsg.type == 21:
print "OFPT_QUEUE_GET_CONFIG_REPLY"
if events & io_loop.WRITE:
try:
next_msg = message_queue_map[sock].get_nowait()
except Queue.Empty:
#print "%s queue empty" % str(address)
io_loop.update_handler(fd, io_loop.READ)
else:
#print 'sending "%s" to %s' % (of.ofp_header(next_msg).type, address)
sock.send(next_msg)
def stats_reply_handler(data,*arg): #print ">>>OFPT_STATS_REPLY:%d",len(data) rmsg = of.ofp_header(data[0:8]) body = data[8:] # 1. parsing ofp_stats_reply reply_header = of.ofp_stats_reply(body[:4]) #reply_header.show() # 2.parsing ofp_flow_stats msg if reply_header.type == 0: reply_desc = of.ofp_desc_stats(body[4:]) reply.show() elif reply_header.type == 1 and len(data)>92: reply_body_data1 = of.ofp_flow_stats(body[4:8]) reply_body_data1.show() # match field in ofp_flow_stats reply_body_wildcards = of.ofp_flow_wildcards(body[8:12]) reply_body_match = of.ofp_match(body[12:48]) # second part in ofp_flow_stats reply_body_data2 = of.ofp_flow_stats_data(body[48:92]) # 3.parsing actions reply_body_action = [] if len(body[92:])>8: #it is very important! num = len(body[92:])/8 for x in xrange(num): reply_body_action.append(of.ofp_action_output(body[92+x*8:100+x*8])) msg = reply_header/reply_body_data1/reply_body_wildcards/reply_body_match/reply_body_data2 msg.show() elif reply_header.type == 2: reply_aggregate = of.ofp_aggregate_stats_reply(body[4:]) reply_aggregate.show() elif reply_header.type == 3: #table_stats length = rmsg.length - 12 num = length/64 for i in xrange(num): table_body = body[4+i*64:i*64+68] reply_table_stats = of.ofp_table_stats(table_body[:36]) table_wildcards = of.ofp_flow_wildcards(table_body[36:40]) reply_table_stats_data = of.ofp_table_stats_data(table_body[40:64]) msg_tmp = reply_header/reply_table_stats/table_wildcards/reply_table_stats_data msg = rmsg/msg_tmp msg.show() elif reply_header.type == 4: #port stats reply length = rmsg.length - 12 num = length/104 for i in xrange(num): offset = 4+i*104 reply_port_stats = of.ofp_port_stats_reply(body[offset:(offset+104)]) msg_tmp = reply_header/reply_port_stats msg = rmsg/msg_tmp msg.show() elif reply_header.type == 5: #queue reply length = rmsg.length - 12 num = length/32 if num: #if the queue is empty ,you need to check it ! for i in xrange(num): offset = 4+i*32 queue_reply = of.ofp_queue_stats(body[offset:offset+32]) msg_tmp = reply_header/queue_reply msg = rmsg/msg_tmp msg.show() elif reply_header.type == 0xffff: #vendor reply msg = rmsg/reply_header/of.ofp_vendor(body[4:]) return None