def lookup(self, dest_ip6):
logging.pktdump("Lookup: {0} pending lookup:{1}".format(dest_ip6, self.lookup_req))
if dest_ip6 in self.lookup_req:
return
# If no response from the lookup_request message at a certain time. Cancel the
# request
self.lookup_req[dest_ip6] = { "ttl" : CONFIG["multihop_ihc"]}
timer = Timer(CONFIG["multihop_tl"], self.lookup_timeout, args=[dest_ip6])
timer.start()
self.flood(dest_ip6, CONFIG["multihop_ihc"])
def lookup(self, dest_ip6):
logging.pktdump("Lookup: {0} pending lookup:{1}".format(dest_ip6, \
self.lookup_req))
if dest_ip6 in self.lookup_req:
return
# If no response from the lookup_request message at a certain time.
# Cancel the request
self.lookup_req[dest_ip6] = { "ttl" : CONFIG["multihop_ihc"]}
timer = Timer(CONFIG["multihop_tl"], self.lookup_timeout, \
args=[dest_ip6])
timer.start()
self.flood(dest_ip6, CONFIG["multihop_ihc"])
def multihop_handle(self, data):
if data[0] != ipop_ver:
logging.error("ipop version mismatch: tincan:{0} controller:{1}"
"".format(data[0].encode("hex"),
ipop_ver.encode("hex")))
if data[1] == tincan_control:
msg = json.loads(data[2:])
logging.debug("multihop control message recv {0}".format(msg))
msg_type = msg.get("msg_type", None)
if msg_type == "lookup_request":
#If this message visit here before, just drop it
for via in msg["via"][:-1]:
if self.ipop_state["_ip6"] == via:
return
# found in peer, do lookup_reply
for k, v in self.peers.iteritems():
if "ip6" in v and v["ip6"] == msg["target_ip6"]:
# IP is found in my peers,
# send reply message back to previous sender
make_remote_call(sock=self.cc_sock,\
dest_addr=msg["via"][-2],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="lookup_reply",\
target_ip6=msg["target_ip6"], via=msg["via"], via_idx=-2)
return
# not found in peer, add current node to via then flood
# lookup_request
for k, v in self.peers.iteritems():
#Do not send lookup_request back to previous hop
logging.pktdump("k:{0}, v:{1}".format(k, v))
if "ip6" in v and msg["via"][-2] == v["ip6"]:
continue
# Flood lookup_request
if "ip6" in v and msg["ttl"] > 1:
make_remote_call(sock=self.cc_sock, dest_addr=v["ip6"],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="lookup_request",\
ttl=msg["ttl"]-1, target_ip6=msg["target_ip6"],\
via=msg["via"] + [v["ip6"]])
if msg_type == "lookup_reply":
if CONFIG["multihop_sr"]:
if ~msg["via_idx"] + 1 == len(msg["via"]):
# In source route mode, only source node updates route
# information
self.update_farpeers(msg["target_ip6"],
len(msg["via"]), msg["via"])
if msg["target_ip6"] in self.lookup_req:
del self.lookup_req[msg["target_ip6"]]
return
else:
# Non source route mode, route information is kept at each
# hop. Each node only keeps the next hop info
self.update_farpeers(msg["target_ip6"], len(msg["via"]),\
msg["via"][msg["via_idx"]+1])
# Send lookup_reply message back to the source
make_remote_call(sock=self.cc_sock,\
dest_addr=msg["via"][msg["via_idx"]-1],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="lookup_reply",\
target_ip6=msg["target_ip6"],\
via=msg["via"], via_idx=msg["via_idx"]-1)
if msg_type == "route_error":
if msg["index"] == 0:
del self.far_peers[msg["via"][-1]]
else:
make_remote_call(sock=self.cc_sock,\
dest_addr=msg["via"][msg["index"]-1],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="route_error",\
index=msg["index"]-1, via=msg["via"])\
if data[1] == tincan_packet:
target_ip6 = ip6_b2a(data[40:56])
logging.pktdump(
"Multihop Packet Destined to {0}".format(target_ip6))
if target_ip6 == self.ipop_state["_ip6"]:
make_call(self.sock, payload=null_uid + null_uid + data[2:])
return
# The packet destined to its direct peers
for k, v in self.peers.iteritems():
if "ip6" in v and v["ip6"] == target_ip6:
make_remote_call(sock=self.cc_sock, dest_addr=target_ip6,\
dest_port=CONFIG["icc_port"], m_type=tincan_packet,\
payload=data[2:])
return
# The packet is not in direct peers but have route information
if ip6_b2a(data[40:56]) in self.far_peers:
make_remote_call(sock=self.cc_sock,\
dest_addr=self.far_peers[target_ip6]["via"],\
dest_port=CONFIG["icc_port"], m_type=tincan_packet,\
payload=data[2:])
return
logging.error("Unroutable packet. Oops this should not happen")
if data[1] == tincan_sr6:
logging.pktdump("Multihop packet received", dump=data)
hop_index = ord(data[2]) + 1
hop_count = ord(data[3])
if hop_index == hop_count:
make_call(self.sock, payload=null_uid + null_uid +\
data[4+(hop_index)*16:])
return
packet = chr(hop_index)
packet += data[3:]
next_addr_offset = 4 + (hop_index) * 16
next_hop_addr = data[next_addr_offset:next_addr_offset + 16]
for k, v in self.peers.iteritems():
if v["ip6"] == ip6_b2a(
next_hop_addr) and v["status"] == "online":
make_remote_call(sock=self.cc_sock,\
dest_addr=ip6_b2a(next_hop_addr),\
dest_port=CONFIG["icc_port"], m_type=tincan_sr6,\
payload=packet)
return
via = []
for i in range(hop_count):
via.append(ip6_b2a(data[4 + i * 16:4 + 16 * i + 16]))
make_remote_call(sock=self.cc_sock, dest_addr=via[hop_index-2],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="route_error", via=via, index=hop_index-2)
logging.debug(
"Link lost send back route_error message to source{0}"
"".format(via[hop_index - 2]))
def multihop_handle(self, data):
if data[0] != ipop_ver:
logging.error("ipop version mismatch: tincan:{0} controller:{1}"
"".format(data[0].encode("hex"), ipop_ver.encode("hex")))
if data[1] == tincan_control:
msg = json.loads(data[2:])
logging.debug("multihop control message recv {0}".format(msg))
msg_type = msg.get("msg_type", None)
if msg_type == "lookup_request":
#If this message visit here before, just drop it
for via in msg["via"][:-1]:
if self.ipop_state["_ip6"] == via:
return
# found in peer, do lookup_reply
for k, v in self.peers.iteritems():
if "ip6" in v and v["ip6"] == msg["target_ip6"]:
# IP is found in my peers,
# send reply message back to previous sender
make_remote_call(sock=self.cc_sock,\
dest_addr=msg["via"][-2],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="lookup_reply",\
target_ip6=msg["target_ip6"], via=msg["via"], via_idx=-2)
return
# not found in peer, add current node to via then flood
# lookup_request
for k, v in self.peers.iteritems():
#Do not send lookup_request back to previous hop
logging.pktdump("k:{0}, v:{1}".format(k, v))
if "ip6" in v and msg["via"][-2] == v["ip6"]:
continue
# Flood lookup_request
if "ip6" in v and msg["ttl"] > 1:
make_remote_call(sock=self.cc_sock, dest_addr=v["ip6"],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="lookup_request",\
ttl=msg["ttl"]-1, target_ip6=msg["target_ip6"],\
via=msg["via"] + [v["ip6"]])
if msg_type == "lookup_reply":
if CONFIG["multihop_sr"]:
if ~msg["via_idx"]+1==len(msg["via"]):
# In source route mode, only source node updates route
# information
self.update_farpeers(msg["target_ip6"],len(msg["via"]),
msg["via"])
if msg["target_ip6"] in self.lookup_req:
del self.lookup_req[msg["target_ip6"]]
return
else:
# Non source route mode, route information is kept at each
# hop. Each node only keeps the next hop info
self.update_farpeers(msg["target_ip6"], len(msg["via"]),\
msg["via"][msg["via_idx"]+1])
# Send lookup_reply message back to the source
make_remote_call(sock=self.cc_sock,\
dest_addr=msg["via"][msg["via_idx"]-1],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="lookup_reply",\
target_ip6=msg["target_ip6"],\
via=msg["via"], via_idx=msg["via_idx"]-1)
if msg_type == "route_error":
if msg["index"] == 0:
del self.far_peers[msg["via"][-1]]
else:
make_remote_call(sock=self.cc_sock,\
dest_addr=msg["via"][msg["index"]-1],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="route_error",\
index=msg["index"]-1, via=msg["via"])\
if data[1] == tincan_packet:
target_ip6=ip6_b2a(data[40:56])
logging.pktdump("Multihop Packet Destined to {0}".format(target_ip6))
if target_ip6 == self.ipop_state["_ip6"]:
make_call(self.sock, payload=null_uid + null_uid + data[2:])
return
# The packet destined to its direct peers
for k, v in self.peers.iteritems():
if "ip6" in v and v["ip6"] == target_ip6:
make_remote_call(sock=self.cc_sock, dest_addr=target_ip6,\
dest_port=CONFIG["icc_port"], m_type=tincan_packet,\
payload=data[2:])
return
# The packet is not in direct peers but have route information
if ip6_b2a(data[40:56]) in self.far_peers:
make_remote_call(sock=self.cc_sock,\
dest_addr=self.far_peers[target_ip6]["via"],\
dest_port=CONFIG["icc_port"], m_type=tincan_packet,\
payload=data[2:])
return
logging.error("Unroutable packet. Oops this should not happen")
if data[1] == tincan_sr6:
logging.pktdump("Multihop packet received", dump=data)
hop_index = ord(data[2]) + 1
hop_count = ord(data[3])
if hop_index == hop_count:
make_call(self.sock, payload=null_uid + null_uid +\
data[4+(hop_index)*16:])
return
packet = chr(hop_index)
packet += data[3:]
next_addr_offset = 4+(hop_index)*16
next_hop_addr = data[next_addr_offset:next_addr_offset+16]
for k, v in self.peers.iteritems():
if v["ip6"]==ip6_b2a(next_hop_addr) and v["status"]=="online":
make_remote_call(sock=self.cc_sock,\
dest_addr=ip6_b2a(next_hop_addr),\
dest_port=CONFIG["icc_port"], m_type=tincan_sr6,\
payload=packet)
return
via = []
for i in range(hop_count):
via.append(ip6_b2a(data[4+i*16:4+16*i+16]))
make_remote_call(sock=self.cc_sock, dest_addr=via[hop_index-2],\
dest_port=CONFIG["icc_port"], m_type=tincan_control,\
payload=None, msg_type="route_error", via=via, index=hop_index-2)
logging.debug("Link lost send back route_error message to source{0}"
"".format(via[hop_index-2]))
