523 lines
18 KiB
Python
Executable file
523 lines
18 KiB
Python
Executable file
from __future__ import unicode_literals
|
|
|
|
import nnpy
|
|
import struct
|
|
|
|
from p4utils.utils.topology import Topology
|
|
from p4utils.utils.sswitch_API import SimpleSwitchAPI
|
|
|
|
from scapy.all import *
|
|
from scapy.data import ETHER_TYPES
|
|
|
|
import sys
|
|
import re
|
|
|
|
import logging
|
|
import argparse
|
|
import subprocess
|
|
|
|
import ipaddress
|
|
|
|
logging.basicConfig()
|
|
log = logging.getLogger("main")
|
|
|
|
|
|
cpu_fields = {
|
|
0: 'UNSET',
|
|
1: 'ICMP6_NS',
|
|
2: 'ICMP6_GENERAL',
|
|
3: 'DEBUG'
|
|
}
|
|
|
|
table_id_fields = {
|
|
0: 'UNSET_TABLE',
|
|
1: 'TABLE_NAT64',
|
|
2: 'TABLE_ICMP6',
|
|
3: 'TABLE_V6_NETWORKS',
|
|
4: 'TABLE_NAT46',
|
|
5: 'TABLE_V4_NETWORKS',
|
|
6: 'TABLE_ARP'
|
|
}
|
|
|
|
table_proto = {
|
|
'ICMP6_ECHO_REQUEST' : 128,
|
|
'ICMP6_ECHO_REPLY' : 129,
|
|
'ICMP6_NS' : 135,
|
|
'ICMP6_NA' : 136,
|
|
'ICMP_ECHO_REPLY' : 0,
|
|
'ICMP_ECHO_REQUEST' : 8
|
|
}
|
|
|
|
table_arp = {
|
|
'ARP_REQUEST': 1,
|
|
'ARP_REPLY': 2
|
|
}
|
|
|
|
|
|
class CpuHeader(Packet):
|
|
name = 'CpuPacket'
|
|
fields_desc = [
|
|
ShortEnumField('task', 1, cpu_fields ),
|
|
ShortField('ingress_port', 0),
|
|
XShortEnumField("type", 0x9000, ETHER_TYPES),
|
|
ShortEnumField('table_id', 1, table_id_fields )
|
|
]
|
|
|
|
|
|
class L2Controller(object):
|
|
def __init__(self, sw_name):
|
|
# Command line mapping
|
|
self.modes = ['base', 'router', "range_router" ]
|
|
|
|
# Reverse maps the cpu header
|
|
self.task = dict(reversed(item) for item in cpu_fields.items())
|
|
|
|
self.info={}
|
|
|
|
# https://en.wikipedia.org/wiki/Solicited-node_multicast_address
|
|
self.info['ndp_multicast'] = ipaddress.ip_network("ff02::1:ff00:0/104")
|
|
self.info['mac_addr'] = "00:00:0a:00:00:42"
|
|
self.info['mac_broadcast'] = "ff:ff:ff:ff:ff:ff"
|
|
self.info['ipv6_link_local'] = ipaddress.ip_address("fe80::200:aff:fe00:42")
|
|
|
|
self.info['v6_mask'] = 64
|
|
self.info['v6_nat64_mask'] = 96
|
|
self.info['v6_base'] = ipaddress.ip_network("2001:db8::/32")
|
|
|
|
self.info['v6_base_hostnet'] = ipaddress.ip_network("2001:db8::/48")
|
|
self.info['v6_gen'] = self.info['v6_base_hostnet'].subnets(new_prefix=self.info['v6_mask'])
|
|
|
|
# possible new range for NAT64 prefixes
|
|
self.info['v6_nat64_base'] = ipaddress.ip_network("2001:db8:1::/48")
|
|
|
|
# We reserve /64 (easier for reading), but only use /96
|
|
self.info['v6_nat64_gen'] = self.info['v6_nat64_base'].subnets(new_prefix=self.info['v6_mask'])
|
|
|
|
self.info['v4_mask'] = 24
|
|
self.info['v4_base'] = ipaddress.ip_network("10.0.0.0/8")
|
|
self.info['v4_gen'] = self.info['v4_base'].subnets(new_prefix=self.info['v4_mask'])
|
|
|
|
self.info['v4_nat64_base'] = ipaddress.ip_network("10.1.0.0/16")
|
|
self.info['v4_nat64_map'] = self.info['v4_nat64_base'].subnets(new_prefix=self.info['v4_mask'])
|
|
|
|
self.info['switch_suffix'] = 0x42
|
|
self.info['nat64_prefix'] = ipaddress.ip_network("64:ff9b::/96")
|
|
|
|
self.v6_routes = {}
|
|
self.v6_routes[None] = []
|
|
self.v6_routes['base'] = []
|
|
|
|
self.ports = []
|
|
|
|
for port in range(1,3):
|
|
net = self.info['v6_gen'].next()
|
|
self.v6_routes['base'].append({
|
|
"net": net,
|
|
"port": port}
|
|
)
|
|
self.ports.append(port)
|
|
|
|
self.v6_routes['router'] = self.v6_routes['base']
|
|
|
|
# only 1 route to avoid table duplicate/conflict
|
|
self.v6_routes['range_router'] = self.v6_routes['base'][0:1]
|
|
|
|
self.v4_routes = {}
|
|
self.v4_routes[None] = []
|
|
self.v4_routes['base'] = []
|
|
for port in range(3,5):
|
|
net = self.info['v4_gen'].next()
|
|
self.v4_routes['base'].append({
|
|
"net": net,
|
|
"port": port}
|
|
)
|
|
self.ports.append(port)
|
|
|
|
self.v4_routes['router'] = self.v4_routes['base']
|
|
self.v4_routes['range_router'] = self.v4_routes['base']
|
|
|
|
self.v6_addresses = {}
|
|
self.v6_addresses[None] = []
|
|
for mode in self.modes:
|
|
self.v6_addresses[mode] = [ net['net'][self.info['switch_suffix']] for net in self.v6_routes[mode] ]
|
|
|
|
self.v4_addresses = {}
|
|
self.v4_addresses[None] = []
|
|
for mode in self.modes:
|
|
self.v4_addresses[mode] = [ net['net'][self.info['switch_suffix']] for net in self.v4_routes[mode] ]
|
|
|
|
self.nat64_map = {}
|
|
# init default
|
|
for mode in self.modes:
|
|
self.nat64_map[mode] = []
|
|
|
|
# specific settings - mapping 256 IPv6 IPs max statically (based on /24)
|
|
for mode in ["range_router"]:
|
|
for v6_net in self.v6_routes[mode]:
|
|
# This is a /64
|
|
v6_dst_base = self.info['v6_nat64_gen'].next()
|
|
|
|
# This is a /96 -> the first /96 inside the /64
|
|
v6_dst = v6_dst_base.subnets(new_prefix=self.info['v6_nat64_mask']).next()
|
|
|
|
for v4_net in self.v4_routes[mode]:
|
|
v4_dst = self.info['v4_nat64_map'].next()
|
|
|
|
self.nat64_map[mode].append({
|
|
"v6_src": v6_net['net'],
|
|
# "v6_dst": self.info['nat64_prefix'] # static -- not supported ATM
|
|
"v6_dst": v6_dst,
|
|
"v4_src": v4_net['net'],
|
|
"v4_dst": v4_dst
|
|
})
|
|
|
|
self.init_boilerplate(sw_name)
|
|
self.init_other_port_multicast_groups()
|
|
|
|
def gen_ndp_multicast_addr(self, addr):
|
|
""" append the 24 bit of the address to the multicast address"""
|
|
|
|
last_24 = int(addr) & 0xffffff
|
|
addr = self.info['ndp_multicast'][last_24]
|
|
|
|
return addr
|
|
|
|
def init_other_port_multicast_groups(self):
|
|
""" map multicast group x to send to
|
|
all ports but x - basically broadcasting without sending back to ourselves
|
|
"""
|
|
|
|
# create multicast nodes
|
|
for rid in self.ports:
|
|
ports = [ x for x in self.ports if not x == rid ]
|
|
n_handle = self.controller.mc_node_create(rid, ports)
|
|
log.debug("Creating MC node rid={} ports={} handle={}".format(rid, ports, n_handle))
|
|
|
|
g_handle = self.controller.mc_mgrp_create(rid)
|
|
log.debug("Created MC group mgrp={} handle={} && associating afterwards".format(rid, g_handle))
|
|
|
|
self.controller.mc_node_associate(g_handle, n_handle)
|
|
|
|
def init_boilerplate(self, sw_name):
|
|
self.topo = Topology(db="topology.db")
|
|
self.sw_name = sw_name
|
|
self.thrift_port = self.topo.get_thrift_port(sw_name)
|
|
self.cpu_port = self.topo.get_cpu_port_index(self.sw_name)
|
|
self.controller = SimpleSwitchAPI(self.thrift_port)
|
|
self.intf = str(self.topo.get_cpu_port_intf(self.sw_name).replace("eth0", "eth1"))
|
|
self.controller.reset_state()
|
|
|
|
if self.cpu_port:
|
|
self.controller.mirroring_add(100, self.cpu_port)
|
|
|
|
def config(self):
|
|
self.fill_tables()
|
|
self.config_hosts()
|
|
|
|
def listen_to_icmp6_multicast(self):
|
|
"""Only needed for debugging"""
|
|
|
|
net = self.info['ndp_multicast']
|
|
self.controller.table_add("v6_networks", "controller_debug", [str(net)])
|
|
|
|
def init_ndp_in_switch(self, addr):
|
|
icmp6_addr = self.gen_ndp_multicast_addr(addr)
|
|
icmp6_net = "{}/128".format(icmp6_addr)
|
|
icmp6_type = 135
|
|
mac_addr = self.info['mac_addr']
|
|
|
|
self.controller.table_add("icmp6",
|
|
"icmp6_neighbor_solicitation",
|
|
[str(icmp6_net), str(icmp6_type)], [str(addr), str(mac_addr)])
|
|
|
|
def init_icmp6_echo_in_switch(self, addr):
|
|
icmp6_addr = addr
|
|
icmp6_type = 128
|
|
icmp6_net = "{}/128".format(icmp6_addr)
|
|
|
|
self.controller.table_add("icmp6",
|
|
"icmp6_echo_reply",
|
|
[str(icmp6_net), str(icmp6_type)], [])
|
|
|
|
|
|
def ipv4_router(self, net):
|
|
return net[self.info['switch_suffix']]
|
|
|
|
def fill_tables(self):
|
|
self.controller.table_clear("v6_networks")
|
|
for v6route in self.v6_routes[self.mode]:
|
|
self.controller.table_add("v6_networks", "set_egress_port", [str(v6route['net'])], [str(v6route['port'])])
|
|
|
|
self.controller.table_clear("v4_networks")
|
|
self.controller.table_clear("v4_arp")
|
|
for v4route in self.v4_routes[self.mode]:
|
|
self.controller.table_add("v4_networks", "set_egress_port", [str(v4route['net'])], [str(v4route['port'])])
|
|
|
|
# ARP support
|
|
router = "{}/32".format(self.ipv4_router(v4route['net']))
|
|
self.controller.table_add("v4_arp", "arp_reply",
|
|
[str(self.info['mac_broadcast']),
|
|
str(table_arp['ARP_REQUEST']),
|
|
router],
|
|
[str(self.info['mac_addr'])]
|
|
)
|
|
|
|
if self.args.multicast_to_controller:
|
|
self.listen_to_icmp6_multicast()
|
|
|
|
self.controller.table_clear("icmp6")
|
|
for v6addr in self.v6_addresses[self.mode]:
|
|
self.init_ndp_in_switch(v6addr)
|
|
self.init_icmp6_echo_in_switch(v6addr)
|
|
|
|
self.controller.table_clear("nat64")
|
|
self.controller.table_clear("nat46")
|
|
for nat64map in self.nat64_map[self.mode]:
|
|
self.static_nat64_mapping(**nat64map)
|
|
|
|
def static_nat64_mapping(self, v6_src, v6_dst, v4_src, v4_dst):
|
|
"""
|
|
Currently using destination only matching due to non priority
|
|
LPM support in P4
|
|
|
|
This could be solved with ternary matches or smart double table usage
|
|
"""
|
|
|
|
log.info("NAT64 map: ({} -> {} => {}), ({} -> {} -> {} (only /24)))".format(
|
|
v6_src, v6_dst, v4_dst,
|
|
v4_src, v4_dst, v6_src))
|
|
|
|
self.controller.table_add("nat64",
|
|
"nat64_static",
|
|
[str(v6_dst)],
|
|
[str(v6_src.network_address),
|
|
str(v4_dst.network_address),
|
|
str(v6_dst.network_address)]
|
|
)
|
|
self.controller.table_add("nat46",
|
|
"nat46_static",
|
|
[str(v4_dst)],
|
|
[str(v6_src.network_address),
|
|
str(v4_dst.network_address),
|
|
str(v6_dst.network_address)]
|
|
)
|
|
|
|
|
|
def config_hosts(self):
|
|
""" Assumptions:
|
|
- all routes are networks (no /128 v6 or /32 v4
|
|
- hosts get the first ip address in the network
|
|
"""
|
|
|
|
for v6route in self.v6_routes[self.mode]:
|
|
host = "h{}".format(v6route['port'])
|
|
dev = "{}-eth0".format(host)
|
|
net = v6route['net']
|
|
ipaddr = "{}/{}".format(net[1],net.prefixlen)
|
|
router = str(net[self.info['switch_suffix']])
|
|
|
|
self.config_v6_host(host, str(net), str(ipaddr), dev, router)
|
|
|
|
for v4route in self.v4_routes[self.mode]:
|
|
host = "h{}".format(v4route['port'])
|
|
dev = "{}-eth0".format(host)
|
|
net = v4route['net']
|
|
ipaddr = "{}/{}".format(net[1],net.prefixlen)
|
|
router = str(self.ipv4_router(net))
|
|
|
|
self.config_v4_host(host, str(net), str(ipaddr), dev, router)
|
|
|
|
@staticmethod
|
|
def config_v6_host(host, net, ipaddr, dev, router=None):
|
|
log.debug("Config v6 host: {} {}->{} on {}".format(host, net, ipaddr, dev))
|
|
|
|
subprocess.call(["mx", host, "ip", "addr", "flush", "dev", dev])
|
|
for v6dev in [ "lo", "default", "all", dev ]:
|
|
subprocess.call(["mx", host, "sysctl", "net.ipv6.conf.{}.disable_ipv6=0".format(v6dev)])
|
|
|
|
# Set down & up to regain link local address
|
|
subprocess.call(["mx", host, "ip", "link", "set", dev, "down"])
|
|
subprocess.call(["mx", host, "ip", "link", "set", dev, "up"])
|
|
|
|
subprocess.call(["mx", host, "ip", "addr", "add", ipaddr, "dev", dev])
|
|
|
|
if router:
|
|
subprocess.call(["mx", host, "ip", "route", "add", "default", "via", router])
|
|
|
|
@staticmethod
|
|
def config_v4_host(host, net, ipaddr, dev, router=None):
|
|
log.debug("Config v4 host: {} {}->{} on {} via {}".format(host, net, ipaddr, dev, router))
|
|
|
|
subprocess.call(["mx", host, "ip", "addr", "flush", "dev", dev])
|
|
subprocess.call(["mx", host, "ip", "addr", "add", ipaddr, "dev", dev])
|
|
|
|
if router:
|
|
subprocess.call(["mx", host, "ip", "route", "add", "default", "via", router])
|
|
|
|
def debug_print_pkg(self, pkg, msg="INCOMING"):
|
|
log.debug("{}: {}".format(msg, pkg.__repr__()))
|
|
|
|
def debug_format_pkg(self, pkg):
|
|
packet = Ether(str(pkg))
|
|
|
|
if packet.type == 0x800:
|
|
ip = pkg.getlayer(IP)
|
|
elif packet.type == 0x86dd:
|
|
ip = pkg.getlayer(IPv6)
|
|
|
|
# tcp = pkg.getlayer(TCP)
|
|
|
|
# raw = pkg.getlayer(Raw)
|
|
|
|
# return "{}:{} => {}:{}: flags={} seq={} ack={} raw={}".format(
|
|
# ip.src, tcp.sport,
|
|
# ip.dst, tcp.dport,
|
|
# tcp.flags,
|
|
# tcp.seq,
|
|
# tcp.ack,
|
|
# raw)
|
|
|
|
def handle_icmp6_echo_request(self, pkg):
|
|
"""
|
|
Sample from the wire:
|
|
|
|
DEBUG:main:reassambled=<Ether dst=00:00:0a:00:00:42 src=00:00:0a:00:00:01 type=0x86dd |<IPv6 version=6 tc=0 fl=474570 plen=64 nh=ICMPv6 hlim=64 src=2001:db8::1 dst=2001:db8::42 |<ICMPv6EchoRequest type=Echo Request code=0 cksum=0xb76d id=0x16cd seq=0x1 data='\x1f\xe2~\\\x00\x00\x00\x00\xf8\x82\x00\x00\x00\x00\x00\x00\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*+,-./01234567' |>>>
|
|
"""
|
|
|
|
log.info("Replying to ICMP packet")
|
|
dst_mac = pkg[Ether].src
|
|
src_mac = pkg[Ether].dst
|
|
|
|
dst_addr = pkg[IPv6].src
|
|
src_addr = pkg[IPv6].dst
|
|
|
|
e = Ether(src=src_mac, dst=dst_mac)
|
|
i = IPv6(src=src_addr, dst=dst_addr)
|
|
i2 = ICMPv6EchoReply(id=pkg[ICMPv6EchoRequest].id,
|
|
seq=pkg[ICMPv6EchoRequest].seq,
|
|
data=pkg[ICMPv6EchoRequest].data)
|
|
i2.cksum = None
|
|
answer = e / i / i2
|
|
|
|
self.send_pkg(answer)
|
|
|
|
|
|
def handle_icmp6_ns(self, pkg):
|
|
""" Solicitated NA"""
|
|
|
|
# Both ways should work
|
|
dst_mac = pkg[Ether].src
|
|
dst_mac = pkg[ICMPv6NDOptSrcLLAddr].lladdr
|
|
src_mac = self.info['mac_address']
|
|
|
|
dst_addr = pkg[IPv6].src
|
|
src_addr = pkg[ICMPv6ND_NS].tgt
|
|
|
|
e = Ether(src=src_mac, dst=dst_mac)
|
|
i = IPv6(src=src_addr, dst=dst_addr)
|
|
|
|
# S=1 -> solicitated
|
|
i2 = ICMPv6ND_NA(S=1, R=0, tgt=src_addr)
|
|
# try5: cksum not chksum !
|
|
i2.cksum = None
|
|
|
|
i3 = ICMPv6NDOptDstLLAddr(lladdr=src_mac)
|
|
|
|
answer = e / i / i2 / i3
|
|
|
|
# try 4
|
|
# for l in [Ether, IPv6, ICMPv6ND_NA, ICMPv6NDOptDstLLAddr]:
|
|
# try:
|
|
# del answer[l].chksum
|
|
# except AttributeError:
|
|
# pass
|
|
|
|
# Let scapy recalc checksum (try3)
|
|
# answer = answer.__class__(str(answer))
|
|
|
|
self.send_pkg(answer)
|
|
|
|
def send_pkg(self, pkg):
|
|
self.debug_print_pkg(pkg, "OUTGOING")
|
|
sendp(pkg, iface=self.intf, verbose=False)
|
|
|
|
def recv_msg_cpu(self, pkg):
|
|
packet = Ether(str(pkg))
|
|
|
|
cpu_header = ""
|
|
ether_orig = ""
|
|
orig_packet = ""
|
|
|
|
if packet.type == 0x4242:
|
|
cpu_header = CpuHeader(packet.payload)
|
|
|
|
# Not necessary anymore - cpu decoding works
|
|
log.debug("cpu = {}".format(cpu_header.__repr__()))
|
|
|
|
ether_orig = Ether(src=packet.src, dst=packet.dst, type=cpu_header.type)
|
|
|
|
if cpu_header.type == 0x0800:
|
|
orig_packet = ether_orig / IP(cpu_header.load)
|
|
elif cpu_header.type == 0x86dd:
|
|
orig_packet = ether_orig / IPv6(cpu_header.load)
|
|
else:
|
|
print("Broken pkg: {}".format(pkg.__repr__()))
|
|
return
|
|
else:
|
|
print("Broken / unhandled pkg: {}".format(pkg.__repr__()))
|
|
return
|
|
|
|
# Process parsed
|
|
if ICMPv6ND_NS in orig_packet and orig_packet['IPv6'].src == '::':
|
|
log.info("Neighbor solicitation for checking her own IP address")
|
|
elif ICMPv6MLReport2 in orig_packet and orig_packet['IPv6'].dst == 'ff02::16':
|
|
mc_group = orig_packet['ICMPv6MLDMultAddrRec'].dst
|
|
log.info("Multicast registration for {} port {} -- should probably handle this".format(mc_group, cpu_header.ingress_port))
|
|
elif ICMPv6ND_RS in orig_packet and orig_packet['IPv6'].dst == 'ff02::2':
|
|
src = orig_packet['IPv6'].src
|
|
log.info("Router solicitation from {} -- should probably handle this?".format(src))
|
|
elif cpu_header.task == self.task['ICMP6_NS']:
|
|
log.info("Doing neighbor solicitation for the switch in the controller")
|
|
self.handle_icmp6_ns(orig_packet)
|
|
elif cpu_header.task == self.task['ICMP6_GENERAL']:
|
|
if ICMPv6EchoRequest in orig_packet:
|
|
self.handle_icmp6_echo_request(orig_packet)
|
|
else:
|
|
log.info("unhandled reassambled={} from table {}".format(orig_packet.__repr__(), table_id_fields[cpu_header.table_id]))
|
|
|
|
|
|
def run_cpu_port_loop(self):
|
|
sniff(iface=self.intf, prn=self.recv_msg_cpu)
|
|
|
|
def commandline(self):
|
|
parser = argparse.ArgumentParser(description='controller++')
|
|
parser.add_argument('--mode', help='Select mode / settings to use', choices=self.modes)
|
|
parser.add_argument('--debug', help='Enable debug logging', action='store_true')
|
|
parser.add_argument('--verbose', help='Enable verbose logging', action='store_true')
|
|
parser.add_argument('--multicast-to-controller', help='Send debug multicast to controller', action='store_true')
|
|
|
|
self.args = parser.parse_args()
|
|
self.mode = self.args.mode
|
|
self.debug = self.args.debug
|
|
|
|
if __name__ == "__main__":
|
|
import sys
|
|
import os
|
|
|
|
sw_name = "s1"
|
|
controller = L2Controller(sw_name)
|
|
controller.commandline()
|
|
|
|
if controller.args.debug:
|
|
log.setLevel(logging.DEBUG)
|
|
elif controller.args.verbose:
|
|
log.setLevel(logging.INFO)
|
|
else:
|
|
log.setLevel(logging.WARNING)
|
|
|
|
log.info("Booting...")
|
|
log.debug("Debug enabled.")
|
|
|
|
|
|
controller.config()
|
|
controller.run_cpu_port_loop()
|