def test_default_args(self):
pi = icmpv6.nd_option_pi()
buf = pi.serialize()
res = struct.unpack(icmpv6.nd_option_pi._PACK_STR, str(buf))
eq_(res[0], icmpv6.ND_OPTION_PI)
eq_(res[1], len(icmpv6.nd_option_pi()) / 8)
eq_(res[2], 0)
eq_(res[3], 0)
eq_(res[4], 0)
eq_(res[5], 0)
eq_(res[6], 0)
eq_(res[7], addrconv.ipv6.text_to_bin('::'))
# with nd_router_advert
prev = ipv6(nxt=inet.IPPROTO_ICMPV6)
ic = icmpv6.icmpv6(
type_=icmpv6.ND_ROUTER_ADVERT,
data=icmpv6.nd_router_advert(
options=[icmpv6.nd_option_pi()]))
prev.serialize(ic, None)
buf = ic.serialize(bytearray(), prev)
res = struct.unpack(icmpv6.icmpv6._PACK_STR, str(buf[:4]))
eq_(res[0], icmpv6.ND_ROUTER_ADVERT)
eq_(res[1], 0)
eq_(res[2], icmpv6_csum(prev, buf))
res = struct.unpack(icmpv6.nd_router_advert._PACK_STR, str(buf[4:16]))
eq_(res[0], 0)
eq_(res[1], 0)
eq_(res[2], 0)
eq_(res[3], 0)
eq_(res[4], 0)
res = struct.unpack(icmpv6.nd_option_pi._PACK_STR, str(buf[16:]))
eq_(res[0], icmpv6.ND_OPTION_PI)
eq_(res[1], 4)
eq_(res[2], 0)
eq_(res[3], 0)
eq_(res[4], 0)
eq_(res[5], 0)
eq_(res[6], 0)
eq_(res[7], addrconv.ipv6.text_to_bin('::'))
def test_default_args(self):
pi = icmpv6.nd_option_pi()
buf = pi.serialize()
res = struct.unpack(icmpv6.nd_option_pi._PACK_STR, str(buf))
eq_(res[0], icmpv6.ND_OPTION_PI)
eq_(res[1], len(icmpv6.nd_option_pi()) / 8)
eq_(res[2], 0)
eq_(res[3], 0)
eq_(res[4], 0)
eq_(res[5], 0)
eq_(res[6], 0)
eq_(res[7], addrconv.ipv6.text_to_bin('::'))
# with nd_router_advert
prev = ipv6(nxt=inet.IPPROTO_ICMPV6)
ic = icmpv6.icmpv6(
type_=icmpv6.ND_ROUTER_ADVERT,
data=icmpv6.nd_router_advert(options=[icmpv6.nd_option_pi()]))
prev.serialize(ic, None)
buf = ic.serialize(bytearray(), prev)
res = struct.unpack(icmpv6.icmpv6._PACK_STR, str(buf[:4]))
eq_(res[0], icmpv6.ND_ROUTER_ADVERT)
eq_(res[1], 0)
eq_(res[2], icmpv6_csum(prev, buf))
res = struct.unpack(icmpv6.nd_router_advert._PACK_STR, str(buf[4:16]))
eq_(res[0], 0)
eq_(res[1], 0)
eq_(res[2], 0)
eq_(res[3], 0)
eq_(res[4], 0)
res = struct.unpack(icmpv6.nd_option_pi._PACK_STR, str(buf[16:]))
eq_(res[0], icmpv6.ND_OPTION_PI)
eq_(res[1], 4)
eq_(res[2], 0)
eq_(res[3], 0)
eq_(res[4], 0)
eq_(res[5], 0)
eq_(res[6], 0)
eq_(res[7], addrconv.ipv6.text_to_bin('::'))
def _send_router_advertisement(self, ipv6_src: str, tun_id: int,
tun_ipv4_dst: str, output_port):
"""
Generates the Router Advertisement response packet
"""
ofproto, parser = self._datapath.ofproto, self._datapath.ofproto_parser
if not tun_id or not tun_ipv4_dst:
self.logger.error("Packet missing tunnel information, can't reply")
return
prefix = self.get_custom_prefix(ipv6_src)
if not prefix:
self.logger.debug("Can't reply to RS for UE ip %s", ipv6_src)
return
pkt = packet.Packet()
pkt.add_protocol(
ethernet.ethernet(
dst=self.MAC_MULTICAST,
src=self.config.ll_addr,
ethertype=ether_types.ETH_TYPE_IPV6,
))
pkt.add_protocol(
ipv6.ipv6(
dst=self.DEVICE_MULTICAST,
src=self.config.ipv6_src,
nxt=in_proto.IPPROTO_ICMPV6,
))
pkt.add_protocol(
icmpv6.icmpv6(
type_=icmpv6.ND_ROUTER_ADVERT,
data=icmpv6.nd_router_advert(options=[
icmpv6.nd_option_sla(hw_src=self.config.ll_addr, ),
icmpv6.nd_option_pi(
pl=self.config.prefix_len,
prefix=prefix,
)
]),
))
pkt.serialize()
actions_out = [
parser.NXActionSetTunnel(tun_id=tun_id),
parser.NXActionRegLoad2(dst='tun_ipv4_dst', value=tun_ipv4_dst),
parser.OFPActionOutput(port=output_port)
]
out = parser.OFPPacketOut(datapath=self._datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions_out,
data=pkt.data)
ret = self._datapath.send_msg(out)
if not ret:
self.logger.error("Datapath disconnected, couldn't send RA")
def generate_ra_pkt(self, datapath, in_port):
nd_option_sla = icmpv6.nd_option_sla(hw_src=self.port_mac_dic[datapath.id][in_port])
nd_option_pi = icmpv6.nd_option_pi(
pl=64, res1=6, val_l=2592000, pre_l=604800,
prefix=setting.Prefix_dic[datapath.id][in_port])
ra_data = icmpv6.nd_router_advert(ch_l=64, res=0, rou_l=1800, rea_t=0, ret_t=0,
options=[nd_option_sla, nd_option_pi])
ra_pkt = packet.Packet()
ra_pkt.add_protocol(ethernet.ethernet(ethertype=0x86DD, dst='33:33:00:00:00:01', src=self.port_mac_dic[datapath.id][in_port]))
ra_pkt.add_protocol(ipv6.ipv6(dst='ff02::1', src=setting.Port_link_dic[datapath.id][in_port], nxt=58))
ra_pkt.add_protocol(icmpv6.icmpv6(type_=134, code=0, data=ra_data))
return ra_pkt
def router_advert(vid,
eth_src,
eth_dst,
src_ip,
dst_ip,
vips,
hop_limit=255,
pi_flags=0x6):
"""Return IPv6 ICMP echo reply packet.
Args:
vid (int or None): VLAN VID to use (or None).
eth_src (str): source Ethernet MAC address.
eth_dst (str): dest Ethernet MAC address.
src_ip (ipaddress.IPv6Address): source IPv6 address.
vips (list): prefixes (ipaddress.IPv6Address) to advertise.
hop_limit (int): IPv6 hop limit.
pi_flags (int): flags to set in prefix information field (default set A and L)
Returns:
ryu.lib.packet.ethernet: Serialized IPv6 ICMP RA packet.
"""
pkt = build_pkt_header(vid, eth_src, eth_dst, ether.ETH_TYPE_IPV6)
ipv6_pkt = ipv6.ipv6(src=src_ip,
dst=dst_ip,
nxt=inet.IPPROTO_ICMPV6,
hop_limit=hop_limit)
pkt.add_protocol(ipv6_pkt)
options = []
for vip in vips:
options.append(
icmpv6.nd_option_pi(
prefix=vip.network.network_address,
pl=vip.network.prefixlen,
res1=pi_flags,
val_l=86400,
pre_l=14400,
))
options.append(icmpv6.nd_option_sla(hw_src=eth_src))
# https://tools.ietf.org/html/rfc4861#section-4.6.2
icmpv6_ra_pkt = icmpv6.icmpv6(type_=icmpv6.ND_ROUTER_ADVERT,
data=icmpv6.nd_router_advert(
rou_l=1800,
ch_l=hop_limit,
options=options))
pkt.add_protocol(icmpv6_ra_pkt)
pkt.serialize()
return pkt
def router_advert(vid, eth_src, eth_dst, src_ip, dst_ip,
vips, pi_flags=0x6):
"""Return IPv6 ICMP Router Advert.
Args:
vid (int or None): VLAN VID to use (or None).
eth_src (str): source Ethernet MAC address.
eth_dst (str): dest Ethernet MAC address.
src_ip (ipaddress.IPv6Address): source IPv6 address.
vips (list): prefixes (ipaddress.IPv6Address) to advertise.
pi_flags (int): flags to set in prefix information field (default set A and L)
Returns:
ryu.lib.packet.ethernet: Serialized IPv6 ICMP RA packet.
"""
pkt = build_pkt_header(
vid, eth_src, eth_dst, valve_of.ether.ETH_TYPE_IPV6)
ipv6_pkt = ipv6.ipv6(
src=src_ip,
dst=dst_ip,
nxt=valve_of.inet.IPPROTO_ICMPV6,
hop_limit=IPV6_MAX_HOP_LIM)
pkt.add_protocol(ipv6_pkt)
options = []
for vip in vips:
options.append(
icmpv6.nd_option_pi(
prefix=vip.network.network_address,
pl=vip.network.prefixlen,
res1=pi_flags,
val_l=86400,
pre_l=14400,
))
options.append(icmpv6.nd_option_sla(hw_src=eth_src))
# https://tools.ietf.org/html/rfc4861#section-4.6.2
icmpv6_ra_pkt = icmpv6.icmpv6(
type_=icmpv6.ND_ROUTER_ADVERT,
data=icmpv6.nd_router_advert(
rou_l=1800,
ch_l=IPV6_RA_HOP_LIM,
options=options))
pkt.add_protocol(icmpv6_ra_pkt)
pkt.serialize()
return pkt
def __init__(self, mac_src, mac_dst, ipv6_src, ipv6_dst, rou_l, ipv6_options):
"""
================ =========================================================
Input Parameter Description
================ =========================================================
mac_src String instance
mac_dst String instance
ipv6_src String instance
ipv6_dst String instance
rou_l Int instance
ipv6_options Tuple instance: (prefix, prefix_length, valid_lft,
preferred_lft)
================ =========================================================
================ =========================================================
Attribute Description
================ =========================================================
pkt The Neighbor Solicitation generated packet
================ =========================================================
"""
self.pkt = packet.Packet()
e = ethernet.ethernet(mac_dst, mac_src, ether.ETH_TYPE_IPV6)
i6 = ipv6.ipv6(src=ipv6_src, dst=ipv6_dst, nxt=inet.IPPROTO_ICMPV6)
# ipv6_options element structure: (prefix, prefix_length, valid_lft, preferred_lft)
options = []
for ipv6_opt in ipv6_options:
options.append(
icmpv6.nd_option_pi(prefix=ipv6_opt[0], pl=ipv6_opt[1], val_l=ipv6_opt[2], pre_l=ipv6_opt[3], res1=2)
)
options.append(icmpv6.nd_option_sla(hw_src=mac_src))
ic = icmpv6.icmpv6(type_=icmpv6.ND_ROUTER_ADVERT, data=icmpv6.nd_router_advert(rou_l=rou_l, options=options))
self.pkt.add_protocol(e)
self.pkt.add_protocol(i6)
self.pkt.add_protocol(ic)
def __init__(self, mac_src, mac_dst, ipv6_src, ipv6_dst, rou_l, ipv6_options): """ ================ ========================================================= Input Parameter Description ================ ========================================================= mac_src String instance mac_dst String instance ipv6_src String instance ipv6_dst String instance rou_l Int instance ipv6_options Tuple instance: (prefix, prefix_length, valid_lft, preferred_lft) ================ ========================================================= ================ ========================================================= Attribute Description ================ ========================================================= pkt The Neighbor Solicitation generated packet ================ ========================================================= """ self.pkt = packet.Packet() e = ethernet.ethernet(mac_dst, mac_src, ether.ETH_TYPE_IPV6) i6 = ipv6.ipv6(src = ipv6_src, dst = ipv6_dst, nxt = inet.IPPROTO_ICMPV6) # ipv6_options element structure: (prefix, prefix_length, valid_lft, preferred_lft) options = [] for ipv6_opt in ipv6_options: options.append(icmpv6.nd_option_pi(prefix = ipv6_opt[0], pl = ipv6_opt[1], val_l = ipv6_opt[2], pre_l = ipv6_opt[3], res1 = 2)) options.append(icmpv6.nd_option_sla(hw_src = mac_src)) ic = icmpv6.icmpv6(type_ = icmpv6.ND_ROUTER_ADVERT, data = icmpv6.nd_router_advert(rou_l = rou_l, options = options)) self.pkt.add_protocol(e) self.pkt.add_protocol(i6) self.pkt.add_protocol(ic)
def _packet_in_handler(self, ev):
#print("===============NEW PACKET===============")
# If you hit this you might want to increase
# the "miss_send_length" of your switch
if ev.msg.msg_len < ev.msg.total_len:
self.logger.debug("packet truncated: only %s of %s bytes",ev.msg.msg_len, ev.msg.total_len)
#Extracting Message informations
#Topology stuff
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
#Protocol stuff
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
dst = eth.dst
src = eth.src
i = pkt.get_protocol(ipv6)
#if it's not related to IPV6, not considered
if i is None:
#Here you can get lldp packets
return 0
print("------------IPV6 PACKET------------")
if(self.RoutingDone==False):
#If it's the first ipv6 packet received routing must be done before
self.collectRoutingInfo()
pkt_type =0
dpid = datapath.id
print 'DPID::{}'.format(dpid)
#Examining protocols in the IP packet
for p in pkt.protocols:
#Handling icmpv6 packets
if p.protocol_name == 'icmpv6':
pkt_type=1
if pkt_type == 1:
print("-----------------ICMPv6-----------------")
icmp = pkt.get_protocols(icmpv6.icmpv6)[0]
itype = 0
found = 0
prefix =''
if icmp.type_== 133:
print 'Type : Router Solicitation'
itype = 1
elif icmp.type_== 134:
print 'Type : Router Advertisement'
itype = 2
elif icmp.type_== 128:
print 'Type : Echo Request'
itype = 4
elif icmp.type_== 129:
print 'Type : Echo Reply'
itype = 5
elif icmp.type_ ==136:
print 'Type : Neighbour Advertisement'
itype=3
elif icmp.type_ ==135:
print'Type : Neighbour Solicitation'
itype=6
else:
print 'Type : other ICMPV6 message'
print (icmp.type_)
#mac_to_port is not used
self.mac_to_port.setdefault(dpid, {})
self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
print("Details : packet in ", dpid, src, dst, in_port)
#once protocols are known, it's time to prepare answers
#temporary solution : here no authentication protocol
#every user are granted
found=1
#In case of Router Sollicitation
if((itype == 1)&(found == 1)):
#Mobility Management Procedure is fired
#Asking for the list of the prior network
#And updating it with the current one
#host ID based on MAC address
#the currrent datapath is also provided
priorNetworks = self.mobTracker.getTraceAndUpdate(src,datapath);
print('~~~~~~~~~~NODE HAS REGISTERED~~~~~~~~~~')
print('previous networks : ')
print (priorNetworks)
print('~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~')
#if the list is empty there is nothing more to do
#if not tunnels must be set up:
if priorNetworks is not None:
#creating tunnels with all the previous network and the current one
for priorDp in priorNetworks[:-1]:
#Getting new tunnel identifier
tunID = self.tunnelID
self.tunnelID += 1
#set up tunnel, host MAC @ is considered as identifier
self.setUpTunnel(src,priorDp,datapath,tunID)
#once flows are set up, router advertisement has to be sent
#create RA including the allocated prefix (should consider multiple prefixes later)
#direct reply on the incomming switch port
out_port = in_port
pkt_generated = packet.Packet()
e= ethernet.ethernet(dst=str(eth.src),src=self.generateMAC(dpid,in_port), ethertype=ether.ETH_TYPE_IPV6)
#AS IT IS A REPLY TO ROUTER SOLLICITATION : SOURCE @ MUST BE LOCAL SCOPE!!
srcIP = self.generateLL(dpid,in_port)
ip = ipv6(nxt=inet.IPPROTO_ICMPV6, src=srcIP, dst=str(i.src))
#setting up prefix : the dependant Local Network prefix is returned
prefix = '200'+str(dpid)+'::1'
icmp_v6 = icmpv6.icmpv6(type_=icmpv6.ND_ROUTER_ADVERT, data=icmpv6.nd_router_advert(ch_l=64, rou_l=4, options=[icmpv6.nd_option_pi(length=4, pl=64, res1=7, val_l=86400, pre_l=14400, prefix=prefix)]))
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(icmp_v6)
pkt_generated.serialize()
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(datapath=datapath, buffer_id=ofproto.OFP_NO_BUFFER, in_port=0, actions=actions, data=pkt_generated.data)
datapath.send_msg(out_ra)
print('>>>>>>>>>> ROUTER ADVERTISEMENT SENT <<<<<<<<<<')
return
#handling neighbour solicitation
elif itype==6:
neighSol = pkt.get_protocols(icmpv6.icmpv6)[0]
print (neighSol)
opt = neighSol.data.option
trg = neighSol.data.dst
if opt is not None :
#if opt is not None, the NS is for getting the MAC @ of a given IP @
if isinstance(opt,ryu.lib.packet.icmpv6.nd_option_sla):
#link layer address request
#check if the solicited @ is the one of the router
trgPort = None
for localPort in range(1,len(self.switchList)+1):
if str(trg)==(self.bindingList[dpid,localPort]):
trgPort = localPort
break;
#if the request concerns the router, prepare answer:
if localPort is not None :
#get hw@
hw_addr = opt.hw_src
#reply with a neighbor adv
neigh_adv = icmpv6.icmpv6(type_=icmpv6.ND_NEIGHBOR_ADVERT, data=icmpv6.nd_neighbor(res=7, dst=str(trg), option=icmpv6.nd_option_tla(hw_src=self.generateMAC(dpid,localPort))))
e= ethernet.ethernet(dst=str(hw_addr),src=self.generateMAC(dpid,in_port), ethertype=ether.ETH_TYPE_IPV6)
#here reply with global scope @
srcIP = self.bindingList[dpid,in_port]
ip = ipv6(nxt=inet.IPPROTO_ICMPV6, src=srcIP, dst=str(i.src))
#direct reply on the incomming switch port
out_port = in_port
pkt_generated = packet.Packet()
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(neigh_adv)
pkt_generated.serialize()
#TODO : think about the flow to set up
# MATCH : router sollicitation for one of the local @:
#creat tuple with all the local @ :
# listTemp=[]
# for i in range(1,len(self.switchList)):
# listTemp.append.(self.bindingList[dpid,i])
# tupleLocalAdd = tuple(listTemp)
# matchs = [parser.OFPMatch(icmpv6_type=135,ipv6_nd_target=tupleLocalAdd)]
#ACTION : the NA must be forwarded on the incomming switch port
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(datapath=datapath, buffer_id=ofproto.OFP_NO_BUFFER, in_port=0, actions=actions, data=pkt_generated.data)
datapath.send_msg(out_ra)
print('..........neighbor advertisement sent..........')
else:
print('conflict resolution')
#if option is None, the NS is sent for conflict resolution :
#we store the annouced MAC the global dict. if they are new
if trg[0:4] != 'fe80' :
#registering globlal @
lst = [eth.src,trg]
if lst not in self.coveredHosts[dpid]:
#the couple is added only if it's a new one
self.coveredHosts[dpid].append(lst)
print ('registered hosts', self.coveredHosts)
#otherwise nothing to do
#handling ping requests and reply
elif itype == 4 or itype == 5:
#looking at destination address, finding out which is the next hope, changing MAC @
ping_src = i.src
ping_dst = i.dst
echo = pkt.get_protocols(icmpv6.icmpv6)[0];
print(echo)
#when ip dst @ is known : 3 cases:
#destination is behind another router
#destination is behind the current router
#destination is the current router
#fetching all the local addresses of the current switch
localAddressesList = []
for localPort in range(1,len(self.switchList)+1):
localAddressesList.append(self.bindingList[dpid,localPort])
if ping_dst in localAddressesList :
print('ping addressed to the router')
#the ping is addressed to the switch:
#!!!! not really working only with local network interfaces
#!!!!not working with backbones interfaces!!!
#if it's a request : reply
if itype == 4:
#copy request data into the reply
reqData = echo.data
pingReply = icmpv6.icmpv6(type_=icmpv6.ICMPV6_ECHO_REPLY, data=reqData)
#direct reply on the incomming switch port
out_port = in_port
e= ethernet.ethernet(dst=src,src=dst, ethertype=ether.ETH_TYPE_IPV6)
#here reply with global scope @
ip = ipv6(nxt=inet.IPPROTO_ICMPV6, src=str(ping_dst), dst=str(ping_src))
pkt_generated = packet.Packet()
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(pingReply)
print('.........................')
print(pkt_generated)
pkt_generated.serialize()
#ACTION : the NA must be forwarded on the incomming switch port
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(datapath=datapath, buffer_id=ofproto.OFP_NO_BUFFER, in_port=0, actions=actions, data=pkt_generated.data)
datapath.send_msg(out_ra)
#TODO Flow to set up...
print('..........Ping Reply sent..........')
else:
print('ping another host or switch received by ', dpid, 'going to', ping_dst)
#TODO : handle ping to backbone interface of a distant router
#pinging switches interfaces
# for localPort in range(2,len(self.switchList)):
# match = parser.OFPMatch(ipv6_dst=(self.bindingList[dpid,localPort]))
# action = [parser.OFPActionOutput(localPort)]
# self.add_flow(datapath, 1, match, action)
#pinging hosts
for dp_ID in range(1,len(self.switchList)+1):
if ping_dst[0:4]==self.bindingList[dp_ID,1][0:4]:
print ('ping going to ', ping_dst , ' must be routed to ', str(dp_ID) ,' as localNW domain is ', self.bindingList[dp_ID,1])
break
#handle the case where no sub domain is found
else:
print ('no subdomain found deleting packet')
#throw exception
return 0
print(self.bindingList[dp_ID,1][0:4])
if dp_ID == dpid:#PING GOING TO LOCAL NETWORK
outputIntf = 1
print('ping toward local network')
#setting new addresses MAC:
new_mac_src = self.generateMAC(dpid,1)
for idx,host in enumerate(self.coveredHosts[dpid]):
if host[1] == ping_dst:
new_mac_dst = self.coveredHosts[dpid][idx][0]
break
else:
print ('host unknown is the subdomain deleting packet')
#throw exception
else:#PING GOING OUTSIDE LOCAL NETWORK
outputIntf = self.routing(dpid,dp_ID)
new_mac_src = self.generateMAC(dpid,outputIntf)
new_mac_dst = self.generateMAC(dp_ID,self.routing(dp_ID,dpid))
print ('ping toward neighbor ', outputIntf)
action = [parser.OFPActionDecNwTtl(), parser.OFPActionSetField(eth_src=new_mac_src),
parser.OFPActionSetField(eth_dst=new_mac_dst),parser.OFPActionOutput(outputIntf) ]
match = parser.OFPMatch( eth_type=0x86dd, ip_proto=58, ipv6_dst=(ping_dst,'ffff:ffff:ffff:ffff::'))
print('ready to push flow to ',datapath)
self.add_flow(datapath, 1, match, action)
print('flow pushed')
else:
print ('')
print("========================================")
def _packet_in_handler(self, ev):
#print("===============NEW PACKET===============")
# If you hit this you might want to increase
# the "miss_send_length" of your switch
if ev.msg.msg_len < ev.msg.total_len:
self.logger.debug("packet truncated: only %s of %s bytes",
ev.msg.msg_len, ev.msg.total_len)
#Extracting Message informations
#Topology stuff
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
#Protocol stuff
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
dst = eth.dst
src = eth.src
i = pkt.get_protocol(ipv6)
#if it's not related to IPV6, not considered
if i is None:
#Here you can get lldp packets
return 0
print("------------IPV6 PACKET------------")
if (self.RoutingDone == False):
#If it's the first ipv6 packet received routing must be done before
self.collectRoutingInfo()
pkt_type = 0
dpid = datapath.id
print 'DPID::{}'.format(dpid)
#Examining protocols in the IP packet
for p in pkt.protocols:
#Handling icmpv6 packets
if p.protocol_name == 'icmpv6':
pkt_type = 1
if pkt_type == 1:
print("-----------------ICMPv6-----------------")
icmp = pkt.get_protocols(icmpv6.icmpv6)[0]
itype = 0
found = 0
prefix = ''
if icmp.type_ == 133:
print 'Type : Router Solicitation'
itype = 1
elif icmp.type_ == 134:
print 'Type : Router Advertisement'
itype = 2
elif icmp.type_ == 128:
print 'Type : Echo Request'
itype = 4
elif icmp.type_ == 129:
print 'Type : Echo Reply'
itype = 5
elif icmp.type_ == 136:
print 'Type : Neighbour Advertisement'
itype = 3
elif icmp.type_ == 135:
print 'Type : Neighbour Solicitation'
itype = 6
else:
print 'Type : other ICMPV6 message'
print(icmp.type_)
#mac_to_port is not used
self.mac_to_port.setdefault(dpid, {})
self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
print("Details : packet in ", dpid, src, dst, in_port)
#once protocols are known, it's time to prepare answers
#temporary solution : here no authentication protocol
#every user are granted
found = 1
#In case of Router Sollicitation
if ((itype == 1) & (found == 1)):
#Mobility Management Procedure is fired
#Asking for the list of the prior network
#And updating it with the current one
#host ID based on MAC address
#the currrent datapath is also provided
priorNetworks = self.mobTracker.getTraceAndUpdate(src, datapath)
print('~~~~~~~~~~NODE HAS REGISTERED~~~~~~~~~~')
print('previous networks : ')
print(priorNetworks)
print('~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~')
#if the list is empty there is nothing more to do
#if not tunnels must be set up:
if priorNetworks is not None:
#maintaining a list in order to know when to stop in the tunnel creation/updating
#and in order not to create a tunnel that will be updated in the same procedure
updatedTunnels = []
#creating tunnels with all the previous network and the current one
for priorDp in priorNetworks[:-1]:
#Getting new tunnel identifier, a tunnelID is build with
#the concatenation of the old router ID and the new router ID
tunID = int(str(priorDp.id) + str(datapath.id))
#when a already updated tunnel is met, it is skipped
if tunID in updatedTunnels:
continue
#else it's registered to the list and the procedure is launched
updatedTunnels.append(tunID)
if priorDp.id != datapath.id:
#set up tunnel, host MAC @ is considered as identifier
self.setUpTunnel(src, priorDp, datapath, tunID)
else:
#if the network is back in a previously visited network
#redirect the tunneled flow on the local interface
priorPrefix = str('200') + str(priorDp.id)
priorAddress = self.forgeHostGlobalIP(src, priorPrefix)
matchBack = datapath.ofproto_parser.OFPMatch(
eth_type=0x86dd,
ip_proto=58,
ipv6_dst=(
priorAddress,
'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff'))
new_mac_src = self.generateMAC(priorDp.id, 1)
new_mac_dst = src
actionsBack = [
datapath.ofproto_parser.OFPActionDecNwTtl(),
datapath.ofproto_parser.OFPActionSetField(
eth_src=new_mac_src),
datapath.ofproto_parser.OFPActionSetField(
eth_dst=new_mac_dst),
datapath.ofproto_parser.OFPActionOutput(1)
]
self.add_flow(datapath, 65535, matchBack, actionsBack)
#once flows are set up, router advertisement has to be sent
#create RA including the allocated prefix (should consider multiple prefixes later)
#direct reply on the incomming switch port
out_port = in_port
pkt_generated = packet.Packet()
e = ethernet.ethernet(dst=str(eth.src),
src=self.generateMAC(dpid, in_port),
ethertype=ether.ETH_TYPE_IPV6)
#AS IT IS A REPLY TO ROUTER SOLLICITATION : SOURCE @ MUST BE LOCAL SCOPE!!
srcIP = self.generateLL(dpid, in_port)
ip = ipv6(nxt=inet.IPPROTO_ICMPV6, src=srcIP, dst=str(i.src))
#setting up prefix : the dependant Local Network prefix is returned
prefix = '200' + str(dpid) + '::1'
icmp_v6 = icmpv6.icmpv6(type_=icmpv6.ND_ROUTER_ADVERT,
data=icmpv6.nd_router_advert(
ch_l=64,
rou_l=4,
options=[
icmpv6.nd_option_pi(length=4,
pl=64,
res1=7,
val_l=86400,
pre_l=14400,
prefix=prefix)
]))
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(icmp_v6)
pkt_generated.serialize()
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=0,
actions=actions,
data=pkt_generated.data)
datapath.send_msg(out_ra)
print('>>>>>>>>>> ROUTER ADVERTISEMENT SENT <<<<<<<<<<')
return
#handling neighbour solicitation
elif itype == 6:
neighSol = pkt.get_protocols(icmpv6.icmpv6)[0]
print(neighSol)
opt = neighSol.data.option
trg = neighSol.data.dst
if opt is not None:
#if opt is not None, the NS is for getting the MAC @ of a given IP @
if isinstance(opt, ryu.lib.packet.icmpv6.nd_option_sla):
#link layer address request
#check if the solicited @ is the one of the router
trgPort = None
for localPort in range(1, len(self.switchList) + 1):
if str(trg) == (self.bindingList[dpid, localPort]):
trgPort = localPort
break
#if the request concerns the router, prepare answer:
if localPort is not None:
#get hw@
hw_addr = opt.hw_src
#reply with a neighbor adv
neigh_adv = icmpv6.icmpv6(
type_=icmpv6.ND_NEIGHBOR_ADVERT,
data=icmpv6.nd_neighbor(
res=7,
dst=str(trg),
option=icmpv6.nd_option_tla(
hw_src=self.generateMAC(dpid, localPort))))
e = ethernet.ethernet(dst=str(hw_addr),
src=self.generateMAC(
dpid, in_port),
ethertype=ether.ETH_TYPE_IPV6)
#here reply with global scope @
srcIP = self.bindingList[dpid, in_port]
ip = ipv6(nxt=inet.IPPROTO_ICMPV6,
src=srcIP,
dst=str(i.src))
#direct reply on the incomming switch port
out_port = in_port
pkt_generated = packet.Packet()
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(neigh_adv)
pkt_generated.serialize()
#TODO : think about the flow to set up
# MATCH : router sollicitation for one of the local @:
#creat tuple with all the local @ :
# listTemp=[]
# for i in range(1,len(self.switchList)):
# listTemp.append.(self.bindingList[dpid,i])
# tupleLocalAdd = tuple(listTemp)
# matchs = [parser.OFPMatch(icmpv6_type=135,ipv6_nd_target=tupleLocalAdd)]
#ACTION : the NA must be forwarded on the incomming switch port
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(
datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=0,
actions=actions,
data=pkt_generated.data)
datapath.send_msg(out_ra)
print(
'..........neighbor advertisement sent..........')
else:
print('conflict resolution')
#if option is None, the NS is sent for conflict resolution :
#we store the annouced MAC the global dict. if they are new
if trg[0:4] != 'fe80':
#registering globlal @
lst = [eth.src, trg]
if lst not in self.coveredHosts[dpid]:
#the couple is added only if it's a new one
self.coveredHosts[dpid].append(lst)
print('registered hosts', self.coveredHosts)
#otherwise nothing to do
#handling ping requests and reply
elif itype == 4 or itype == 5:
#looking at destination address, finding out which is the next hope, changing MAC @
ping_src = i.src
ping_dst = i.dst
echo = pkt.get_protocols(icmpv6.icmpv6)[0]
print(echo)
#when ip dst @ is known : 3 cases:
#destination is behind another router
#destination is behind the current router
#destination is the current router
#fetching all the local addresses of the current switch
localAddressesList = []
for localPort in range(1, len(self.switchList) + 1):
localAddressesList.append(self.bindingList[dpid, localPort])
if ping_dst in localAddressesList:
print('ping addressed to the router')
#the ping is addressed to the switch:
#!!!! not really working only with local network interfaces
#!!!!not working with backbones interfaces!!!
#if it's a request : reply
if itype == 4:
#copy request data into the reply
reqData = echo.data
pingReply = icmpv6.icmpv6(type_=icmpv6.ICMPV6_ECHO_REPLY,
data=reqData)
#direct reply on the incomming switch port
out_port = in_port
e = ethernet.ethernet(dst=src,
src=dst,
ethertype=ether.ETH_TYPE_IPV6)
#here reply with global scope @
ip = ipv6(nxt=inet.IPPROTO_ICMPV6,
src=str(ping_dst),
dst=str(ping_src))
pkt_generated = packet.Packet()
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(pingReply)
print('.........................')
print(pkt_generated)
pkt_generated.serialize()
#ACTION : the NA must be forwarded on the incomming switch port
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(
datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=0,
actions=actions,
data=pkt_generated.data)
datapath.send_msg(out_ra)
#TODO Flow to set up...
print('..........Ping Reply sent..........')
else:
print('ping another host or switch received by ', dpid,
'going to', ping_dst)
#TODO : handle ping to backbone interface of a distant router
#pinging switches interfaces
# for localPort in range(2,len(self.switchList)):
# match = parser.OFPMatch(ipv6_dst=(self.bindingList[dpid,localPort]))
# action = [parser.OFPActionOutput(localPort)]
# self.add_flow(datapath, 1, match, action)
#pinging hosts
for dp_ID in range(1, len(self.switchList) + 1):
if ping_dst[0:4] == self.bindingList[dp_ID, 1][0:4]:
print('ping going to ', ping_dst,
' must be routed to ', str(dp_ID),
' as localNW domain is ', self.bindingList[dp_ID,
1])
break
#handle the case where no sub domain is found
else:
print('no subdomain found deleting packet')
#throw exception
return 0
print(self.bindingList[dp_ID, 1][0:4])
if dp_ID == dpid: #PING GOING TO LOCAL NETWORK
outputIntf = 1
print('ping toward local network')
#setting new addresses MAC:
new_mac_src = self.generateMAC(dpid, 1)
for idx, host in enumerate(self.coveredHosts[dpid]):
if host[1] == ping_dst:
new_mac_dst = self.coveredHosts[dpid][idx][0]
break
else:
print('host unknown is the subdomain deleting packet')
#throw exception
else: #PING GOING OUTSIDE LOCAL NETWORK
outputIntf = self.routing(dpid, dp_ID)
new_mac_src = self.generateMAC(dpid, outputIntf)
new_mac_dst = self.generateMAC(dp_ID,
self.routing(dp_ID, dpid))
print('ping toward neighbor ', outputIntf)
action = [
parser.OFPActionDecNwTtl(),
parser.OFPActionSetField(eth_src=new_mac_src),
parser.OFPActionSetField(eth_dst=new_mac_dst),
parser.OFPActionOutput(outputIntf)
]
match = parser.OFPMatch(eth_type=0x86dd,
ip_proto=58,
ipv6_dst=(ping_dst,
'ffff:ffff:ffff:ffff::'))
print('ready to push flow to ', datapath)
#routing related flow then pushed to table 1
self.add_flow(datapath, 1, match, action, tblId=1)
print('flow pushed')
else:
print('')
print("========================================")
def _packet_in_handler(self, ev):
# If you hit this you might want to increase
# the "miss_send_length" of your switch
if ev.msg.msg_len < ev.msg.total_len:
self.logger.debug("packet truncated: only %s of %s bytes",ev.msg.msg_len, ev.msg.total_len)
#Extracting Message informations
#Topology stuff
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
#Protocol stuff
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
dst = eth.dst
src = eth.src
i = pkt.get_protocol(ipv6)
#if it's not related to IPV6, not considered
if i is None:
#Here you can get lldp packets
return 0
print("------------IPV6 PACKET------------")
if(self.RoutingDone==False):
#If it's the first ipv6 packet received routing must be done before
self.collectRoutingInfo()
pkt_type =0
dpid = datapath.id
print 'DPID::{}'.format(dpid)
#Examining protocols in the IP packet
for p in pkt.protocols:
#Handling icmpv6 packets
if p.protocol_name == 'icmpv6':
pkt_type=1
if pkt_type == 1:
print("-----------------ICMPv6-----------------")
icmp = pkt.get_protocols(icmpv6.icmpv6)[0]
itype = 0
found = 0
prefix =''
if icmp.type_== 133:
print 'Type : Router Solicitation'
itype = 1
elif icmp.type_== 134:
print 'Type : Router Advertisement'
itype = 2
elif icmp.type_== 128:
print 'Type : Echo Request'
itype = 4
elif icmp.type_== 129:
print 'Type : Echo Reply'
itype = 5
elif icmp.type_ ==136:
print 'Type : Neighbour Advertisement'
itype=3
elif icmp.type_ ==135:
print'Type : Neighbour Solicitation'
itype=6
else:
print 'Type : other ICMPV6 message'
print (icmp.type_)
#mac_to_port is not used
self.mac_to_port.setdefault(dpid, {})
self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
print("Details : packet in ", dpid, src, dst, in_port)
#once protocols are known, it's time to prepare answers
#temporary solution : here no authentication protocol
#every user are granted
found=1
#In case of Router Solicitation
if((itype == 1)&(found == 1)):
#checking if the incomming port is not a backbone port:
validIntf=True;
for link in self.linkList:
if (link.src.dpid,link.src.port_no) == (dpid,in_port) or (link.dst.dpid,link.dst.port_no) == (dpid,in_port):
validIntf = False;
print('local host registration : non valid input interface (belongs to backbone)')
break
if not validIntf :
return 0;
#computing the global ipv6 address the host will forge
nbrZeros=3-len(str(dpid))
newPrefix='2'+'0'*nbrZeros+str(dpid)
newAddress = self.forgeHostGlobalIP(src,newPrefix)
#registering or updating host in the current router
hostDetails = (eth.src,in_port)
self.coveredHosts[dpid][newAddress]=hostDetails
print ('coveredHost updated : switch ', dpid)
print self.coveredHosts
#registering the interface in the bindingList
#done if the interface is not discovered already (dynamic linking),
if (dpid,in_port) not in self.bindingList.keys():
self.bindingList[dpid,in_port]='2'+'0'*nbrZeros+str(dpid)+'::'+str(in_port)
print ('bindingList updated : switch ', dpid)
print self.bindingList
print ('local host registration : host : ', eth.src , ' registered under ',dpid,' coverage at interface number ',in_port, 'with ip@ :', newAddress )
#Mobility Management Procedure is fired
#Asking for the list of the prior network
#And updating it with the current one
#host ID based on MAC address
#the currrent datapath is also provided
priorNetworks = self.mobTracker.getTraceAndUpdate(src,datapath);
print('~~~~~~~~~~NODE HAS REGISTERED~~~~~~~~~~')
print('previous networks : ')
print (priorNetworks)
print('~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~')
#if the list is empty there is nothing more to do
#if not tunnels must be set up:
if priorNetworks is not None:
#maintaining a list in order to know when to stop in the tunnel creation/updating
#and in order not to create a tunnel that will be updated in the same procedure
updatedTunnels=[]
#creating tunnels with all the previous network and the current one
for priorDp in priorNetworks[:-1]:
print('###########SETTING UP TUNNEL############')
#Getting new tunnel identifier, a tunnelID is build with
#the concatenation of the old router ID and the new router ID
tunID = int(str(priorDp.id)+str(datapath.id))
#when a already updated tunnel is met, it is skipped
if tunID in updatedTunnels:
continue;
#else it's registered to the list and the procedure is launched
updatedTunnels.append(tunID)
#fetching IP addr the host forged in the previous network
#in asking coveredHost dict with the provided MAC @
priorAddress = None
for ipAddress in self.coveredHosts[priorDp.id].keys():
#comparing MAC addresses
if self.coveredHosts[priorDp.id][ipAddress][0]==src:
priorAddress=ipAddress
break
else:
#if the mac address is not associated to any ip address, exit
print('the host with mac @ : ',src,' has never visited ' , priorDp.id , ' here is its covered Hosts : ')
print( self.coveredHosts[priorDp.id])
return 0;
# nbrZeros=3-len(str(priorDp.id))
# priorPrefix='2'+'0'*nbrZeros+str(priorDp.id)
# #priorPrefix = str('200')+str(priorDp.id)
# priorAddress = self.forgeHostGlobalIP(src,priorPrefix)
if priorDp.id != datapath.id:
#set up tunnel, host MAC @ is considered as identifier
self.setUpTunnel(priorAddress,priorDp,datapath,tunID)
print('tunnel set up from ', priorDp.id, ' to ', datapath.id)
#Each previously built address is included in a proactively pushed flow for
#forwarding on the input interface which is registered in table 3 of the new
#covering router. so that the NewInput flow forwards packets to this
#table to resolve the local output interface
#
#in_port is the interface to which packets comming from the tunnel have to be forwarded to
#if the node change the interface it is linked to
#the switch, a new router solicitation is sent,
#all the tunnel are then updated and so is table 2
output_intf = in_port
match2 = parser.OFPMatch( eth_type=0x86dd, ip_proto=58, ipv6_dst=(priorAddress,'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff'))
#set up mac addresses
new_mac_src = self.generateMAC(dpid,output_intf)
new_mac_dst = eth.src
action2 = [parser.OFPActionDecNwTtl(), parser.OFPActionSetField(eth_src=new_mac_src),
parser.OFPActionSetField(eth_dst=new_mac_dst),parser.OFPActionOutput(output_intf) ]
#remote address routing related flow then pushed to table 2
self.add_flow(datapath, 1, match2, action2,tblId=2)
print('Remote Routing Flow : prior address ', priorAddress, ' -> interface : ',output_intf,' written in switch ', datapath.id)
else:
#if the network is back in a previously visited network
#redirect the tunneled flow on the local interface
print('Mobile node ',src,' is back to network ', dpid)
matchBack = datapath.ofproto_parser.OFPMatch( eth_type=0x86dd, ip_proto=58,vlan_vid=0x000, ipv6_dst=(priorAddress,'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff'))
output_port = in_port
new_mac_src = self.generateMAC(priorDp.id,output_port)
new_mac_dst = src
actionsBack = [datapath.ofproto_parser.OFPActionDecNwTtl(), datapath.ofproto_parser.OFPActionSetField(eth_src=new_mac_src),
datapath.ofproto_parser.OFPActionSetField(eth_dst=new_mac_dst)]
instsBack = [datapath.ofproto_parser.OFPInstructionActions(datapath.ofproto.OFPIT_APPLY_ACTIONS,actionsBack)]
#Forward to normal routing table (table 1)
instsBack.append(datapath.ofproto_parser.OFPInstructionGotoTable(1))
modBack = datapath.ofproto_parser.OFPFlowMod(datapath=datapath, priority=65535, match=matchBack,instructions=instsBack)
datapath.send_msg(modBack)
print('Tunnel flow pushed to switch ' ,datapath.id ,' to make packets going to ', priorAddress, ' going to local network again')
#once flows are set up, router advertisement has to be sent
#create RA including the allocated prefix (should consider multiple prefixes later)
#direct reply on the incomming switch port
out_port = in_port
pkt_generated = packet.Packet()
e= ethernet.ethernet(dst=str(eth.src),src=self.generateMAC(dpid,in_port), ethertype=ether.ETH_TYPE_IPV6)
#AS IT IS A REPLY TO ROUTER SOLLICITATION : SOURCE @ MUST BE LOCAL SCOPE!!
srcIP = self.generateLL(dpid,in_port)
ip = ipv6(nxt=inet.IPPROTO_ICMPV6, src=srcIP, dst=str(i.src))
#setting up prefix : the dependant Local Network prefix is returned
#nbrZeros=3-len(str(dpid))
#prefix='2'+'0'*nbrZeros+str(dpid)+'::1'
prefix=self.bindingList[dpid,in_port]
icmp_v6 = icmpv6.icmpv6(type_=icmpv6.ND_ROUTER_ADVERT, data=icmpv6.nd_router_advert(ch_l=64, rou_l=4, options=[icmpv6.nd_option_pi(length=4, pl=64, res1=7, val_l=86400, pre_l=14400, prefix=prefix)]))
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(icmp_v6)
pkt_generated.serialize()
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(datapath=datapath, buffer_id=ofproto.OFP_NO_BUFFER, in_port=0, actions=actions, data=pkt_generated.data)
datapath.send_msg(out_ra)
print('>>>>>>>>>> ROUTER ADVERTISEMENT SENT <<<<<<<<<<')
return
#handling neighbour solicitation
elif itype==6:
neighSol = pkt.get_protocols(icmpv6.icmpv6)[0]
print (neighSol)
opt = neighSol.data.option
trg = neighSol.data.dst
if opt is not None :
#if opt is not None, the NS is for getting the MAC @ of a given IP @
if isinstance(opt,ryu.lib.packet.icmpv6.nd_option_sla):
#link layer address request
#check if the solicited @ is the one of the router
#fetching all the local addresses and the associated port of the current switch
trgPort = None
localAddressesIntfList = [ [self.bindingList[localPort],localPort[1]] for localPort in self.bindingList.keys() if localPort[0]==dpid ]
addrList = [addr[0] for addr in localAddressesIntfList ]
if str(trg) in addrList:
print('resolving switch mac address')
index = addrList.index(str(trg))
trgPort = localAddressesIntfList[index][1]
#if no address has been found, switch checks if the asking address
#is one of another local host since there are now several local
#interfaces under which hosts have the same prefix
if trgPort is None:
#checking if mac @ of another local host is asked
if str(trg) in self.coveredHosts[dpid].keys():
print('resolving other local host address')
#returning incomming port, so that the asking node
#will use the mac @ of the switch's interface it's linked to
trgPort = in_port
#if the request concerns the router, prepare answer:
if trgPort is not None :
#get hw@
hw_addr = opt.hw_src
#reply with a neighbor adv
neigh_adv = icmpv6.icmpv6(type_=icmpv6.ND_NEIGHBOR_ADVERT, data=icmpv6.nd_neighbor(res=7, dst=str(trg), option=icmpv6.nd_option_tla(hw_src=self.generateMAC(dpid,trgPort))))
e= ethernet.ethernet(dst=str(hw_addr),src=self.generateMAC(dpid,in_port), ethertype=ether.ETH_TYPE_IPV6)
#here reply with global scope @
srcIP = self.bindingList[dpid,in_port]
ip = ipv6(nxt=inet.IPPROTO_ICMPV6, src=srcIP, dst=str(i.src))
#direct reply on the incomming switch port
out_port = in_port
pkt_generated = packet.Packet()
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(neigh_adv)
pkt_generated.serialize()
#ACTION : the NA must be forwarded on the incomming switch port
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(datapath=datapath, buffer_id=ofproto.OFP_NO_BUFFER, in_port=0, actions=actions, data=pkt_generated.data)
datapath.send_msg(out_ra)
print('..........neighbor advertisement sent..........')
else:
print(trg, ' address neither belongs to switch or local host')
else:
print('neighbor solicitation conflict resolution')
#nothing is done here all the registration porcess is now done a the reception
#or the router solicitation
#handling ping requests and reply
elif itype == 4 or itype == 5:
#looking at destination address, finding out which is the next hope, changing MAC @
ping_src = i.src
ping_dst = i.dst
echo = pkt.get_protocols(icmpv6.icmpv6)[0];
print(echo)
#when ip dst @ is known : 3 cases:
#destination is behind another router
#destination is behind the current router
#destination is the current router
#fetching all the local addresses of the current switch
localAddressesList = [ self.bindingList[localPort] for localPort in self.bindingList.keys() if localPort[0]==dpid ]
if ping_dst in localAddressesList :
print('ping addressed to the router')
#the ping is addressed to the switch:
#if it's a request : reply
if itype == 4:
#copy request data into the reply
reqData = echo.data
pingReply = icmpv6.icmpv6(type_=icmpv6.ICMPV6_ECHO_REPLY, data=reqData)
#direct reply on the incomming switch port
out_port = in_port
e= ethernet.ethernet(dst=src,src=dst, ethertype=ether.ETH_TYPE_IPV6)
#here reply with global scope @
ip = ipv6(nxt=inet.IPPROTO_ICMPV6, src=str(ping_dst), dst=str(ping_src))
pkt_generated = packet.Packet()
pkt_generated.add_protocol(e)
pkt_generated.add_protocol(ip)
pkt_generated.add_protocol(pingReply)
print('.........................')
print(pkt_generated)
pkt_generated.serialize()
#ACTION : the NA must be forwarded on the incomming switch port
actions = [parser.OFPActionOutput(out_port)]
out_ra = parser.OFPPacketOut(datapath=datapath, buffer_id=ofproto.OFP_NO_BUFFER, in_port=0, actions=actions, data=pkt_generated.data)
datapath.send_msg(out_ra)
print('..........Ping Reply sent..........')
else:
print('ping another host or switch received by ', dpid, 'going to', ping_dst)
#first step : finding out the destination switch
#now only host pinging is considered (no ping to backbone intf of remote switch)
extractedDomain = re.match(r"20*(?P<trgDpid>[1-9]{1,3})",ping_dst[0:4])
#getting the dpid covering the destination host
extractedDpid = int(extractedDomain.group('trgDpid'))
if extractedDpid is None :
#if extractedDpid is None it mean that dest address begins with 2000:
#this is a backbone interface ip address
#
#extracting the switch to which this interface belongs
extractedDest = re.match(r".+:{1,2}(?P<trgDpid>[0-9]{1,4})$",ping_dst)
extractedDpid = int(extractedDest.group('trgDpid'))
#checking validity of the obtained dpid
if extractedDpid in [s.dp.id for s in self.switchList]:
print ('ping going to ', ping_dst , ' must be routed to router ', str(extractedDpid) ,' as destination domain is ', ping_dst[0:4])
#handle the case where no sub domain is found
else:
print ('no subdomain found deleting packet')
#throw exception
return 0
destDpid = extractedDpid
#1st case destination covering switch is the current one
if destDpid == dpid:
#checking if the ping destination is linked to one of the local interfaces
print('ping toward local network, resolving local interface')
if ping_dst not in self.coveredHosts[destDpid].keys():
print('destination: ', ping_dst ,' host is not linked to the domain switch, deleting packet')
return 0
#if destination host is linked to the switch, resolving the interface
outputIntf = self.coveredHosts[destDpid][ping_dst][1]
#setting new addresses MAC:
new_mac_src = self.generateMAC(destDpid,outputIntf)
new_mac_dst = self.coveredHosts[destDpid][ping_dst][0]
print('ping local host ', ping_dst , ' through interface ', outputIntf)
#2nd case destination covering switch is not the current one
else:#PING GOING OUTSIDE LOCAL NETWORK
#finding nexthop
nextHopID = self.next_hop(dpid,destDpid)
#finding output interface
outputIntf = self.routing(dpid,nextHopID)
new_mac_src = self.generateMAC(dpid,outputIntf)
new_mac_dst = self.generateMAC(nextHopID,self.routing(nextHopID,dpid))
print ('ping toward neighbor ', outputIntf)
action = [parser.OFPActionDecNwTtl(), parser.OFPActionSetField(eth_src=new_mac_src),
parser.OFPActionSetField(eth_dst=new_mac_dst),parser.OFPActionOutput(outputIntf) ]
match = parser.OFPMatch( eth_type=0x86dd, ip_proto=58, ipv6_dst=(ping_dst,'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff'))
print('ready to push flow to ',datapath)
#routing related flow then pushed to table 1
self.add_flow(datapath, 1, match, action,tblId=1)
print('flow pushed')
else:
print ('')
print("========================================")
def _send_router_advertisement(
self,
ipv6_src: str,
tun_id: int,
output_port,
):
"""
Generates the Router Advertisement response packet
"""
ofproto, parser = self._datapath.ofproto, self._datapath.ofproto_parser
if not tun_id:
self.logger.debug(
"Packet missing tunnel-id information, can't reply")
return
prefix = self.get_custom_prefix(ipv6_src)
if not prefix:
self.logger.debug("Can't reply to RS for UE ip %s", ipv6_src)
return
pkt = packet.Packet()
pkt.add_protocol(
ethernet.ethernet(
dst=self.MAC_MULTICAST,
src=self.config.ll_addr,
ethertype=ether_types.ETH_TYPE_IPV6,
), )
pkt.add_protocol(
ipv6.ipv6(
dst=ipv6_src,
src=self.config.ipv6_src,
nxt=in_proto.IPPROTO_ICMPV6,
), )
pkt.add_protocol(
icmpv6.icmpv6(
type_=icmpv6.ND_ROUTER_ADVERT,
data=icmpv6.nd_router_advert(
ch_l=MAX_HOP_LIMIT,
rou_l=MAX_ROUTE_ADVT_LIFE_TIME,
options=[
icmpv6.nd_option_sla(hw_src=self.config.ll_addr, ),
icmpv6.nd_option_pi(
pl=self.config.prefix_len,
prefix=prefix,
val_l=MAX_ROUTE_LIFE_TIME,
pre_l=MAX_ROUTE_LIFE_TIME,
res1=int(
hex(ROUTE_PREFIX_HDR_FLAG_L
| ROUTE_PREFIX_HDR_FLAG_A), 16),
),
],
),
), )
self.logger.debug("RA pkt response ->")
for p in pkt.protocols:
self.logger.debug(p)
pkt.serialize()
actions_out = [
parser.NXActionSetTunnel(tun_id=tun_id),
parser.OFPActionOutput(port=output_port),
]
out = parser.OFPPacketOut(
datapath=self._datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions_out,
data=pkt.data,
)
ret = self._datapath.send_msg(out)
if not ret:
self.logger.error("Datapath disconnected, couldn't send RA")