670 lines
24 KiB
Python
Executable file
670 lines
24 KiB
Python
Executable file
from __future__ import unicode_literals
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import nnpy
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import struct
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from p4utils.utils.topology import Topology
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from p4utils.utils.sswitch_API import SimpleSwitchAPI
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from scapy.all import *
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from scapy.data import ETHER_TYPES
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import sys
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import re
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import logging
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import argparse
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import subprocess
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import ipaddress
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logging.basicConfig()
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log = logging.getLogger("main")
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cpu_fields = {
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0: 'UNSET',
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1: 'ICMP6_NS',
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2: 'ICMP6_GENERAL',
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3: 'DEBUG',
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8: 'NAT64_TCP_SESSION'
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}
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table_id_fields = {
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0: 'UNSET_TABLE',
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1: 'TABLE_NAT64',
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2: 'TABLE_ICMP6',
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3: 'TABLE_V6_NETWORKS',
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4: 'TABLE_NAT46',
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5: 'TABLE_V4_NETWORKS',
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6: 'TABLE_ARP',
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7: 'TABLE_ARP_EGRESS',
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8: 'TABLE_ICMP',
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9: 'TABLE_NAT64_TCP',
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10: 'TABLE_NAT64_UDP',
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11: 'TABLE_NAT64_ICMP6',
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12: 'TABLE_NAT64_SESSION'
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}
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table_proto = {
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'ICMP6_ECHO_REQUEST' : 128,
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'ICMP6_ECHO_REPLY' : 129,
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'ICMP6_NS' : 135,
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'ICMP6_NA' : 136,
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'ICMP_ECHO_REPLY' : 0,
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'ICMP_ECHO_REQUEST' : 8
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}
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table_arp = {
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'ARP_REQUEST': 1,
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'ARP_REPLY': 2
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}
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class CpuHeader(Packet):
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name = 'CpuPacket'
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fields_desc = [
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ShortEnumField('task', 1, cpu_fields ),
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ShortField('ingress_port', 0),
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XShortEnumField("type", 0x9000, ETHER_TYPES),
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ShortEnumField('table_id', 1, table_id_fields )
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]
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class L2Controller(object):
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def __init__(self, sw_name):
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# Command line mapping
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self.modes = ['base', 'router', "range_router", "session_router" ]
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# Reverse maps the cpu header
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self.task = dict(reversed(item) for item in cpu_fields.items())
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self.info={}
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# https://en.wikipedia.org/wiki/Solicited-node_multicast_address
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self.info['ndp_multicast'] = ipaddress.ip_network("ff02::1:ff00:0/104")
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self.info['mac_base'] = "00:00:0a:00:00:0{}"
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self.info['mac_addr'] = "00:00:0a:00:00:42"
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self.info['mac_broadcast'] = "ff:ff:ff:ff:ff:ff"
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self.info['ipv6_link_local'] = ipaddress.ip_address("fe80::200:aff:fe00:42")
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self.info['v6_mask'] = 64
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self.info['v6_nat64_mask'] = 96
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self.info['v6_base'] = ipaddress.ip_network("2001:db8::/40")
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self.info['v6_base_hostnet'] = ipaddress.ip_network("2001:db8::/48")
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self.info['v6_gen'] = self.info['v6_base_hostnet'].subnets(new_prefix=self.info['v6_mask'])
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# possible new range for NAT64 prefixes
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self.info['v6_nat64_base'] = ipaddress.ip_network("2001:db8:1::/48")
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# We reserve /64 (easier for reading), but only use /96
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self.info['v6_nat64_gen'] = self.info['v6_nat64_base'].subnets(new_prefix=self.info['v6_mask'])
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self.info['v4_mask'] = 24
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self.info['v4_base'] = ipaddress.ip_network("10.0.0.0/8")
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self.info['v4_gen'] = self.info['v4_base'].subnets(new_prefix=self.info['v4_mask'])
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self.info['v4_nat64_base'] = ipaddress.ip_network("10.1.0.0/16")
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self.info['v4_nat64_map'] = self.info['v4_nat64_base'].subnets(new_prefix=self.info['v4_mask'])
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self.info['switch_suffix'] = 0x42
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self.info['nat64_prefix'] = ipaddress.ip_network("64:ff9b::/96")
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# /96 after the /40 pool we use above
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self.info['nat64_prefix_dynamic'] = ipaddress.ip_network("2001:db8:100::/96")
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self.info['nat64_tcp_session'] = {}
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self.v6_routes = {}
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self.v6_routes[None] = []
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self.v6_routes['base'] = []
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self.ports = []
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for port in range(1,3):
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net = self.info['v6_gen'].next()
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self.v6_routes['base'].append({
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"net": net,
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"port": port,
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"mac": self.info['mac_base'].format(port)
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})
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self.ports.append(port)
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self.v6_routes['router'] = self.v6_routes['base']
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# only 1 route to avoid table duplicate/conflict
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self.v6_routes['range_router'] = self.v6_routes['base'][0:1]
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self.v6_routes['session_router'] = self.v6_routes['range_router']
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self.v4_routes = {}
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self.v4_routes[None] = []
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self.v4_routes['base'] = []
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for port in range(3,5):
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net = self.info['v4_gen'].next()
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self.v4_routes['base'].append({
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"net": net,
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"port": port,
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"mac": self.info['mac_base'].format(port)
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})
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self.ports.append(port)
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self.v4_routes['router'] = self.v4_routes['base']
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self.v4_routes['range_router'] = self.v4_routes['base']
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self.v4_routes['session_router'] = self.v4_routes['base']
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self.v6_addresses = {}
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self.v6_addresses[None] = []
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for mode in self.modes:
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self.v6_addresses[mode] = [ net['net'][self.info['switch_suffix']] for net in self.v6_routes[mode] ]
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self.v4_addresses = {}
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self.v4_addresses[None] = []
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for mode in self.modes:
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self.v4_addresses[mode] = [ net['net'][self.info['switch_suffix']] for net in self.v4_routes[mode] ]
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self.nat64_map = {}
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self.nat64_session_net = {}
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# init default
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for mode in self.modes:
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self.nat64_map[mode] = []
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self.nat64_session_net[mode] = []
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# specific settings - mapping 256 IPv6 IPs max statically (based on /24)
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for mode in ["range_router"]:
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for v6_net in self.v6_routes[mode]:
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# This is a /64
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v6_dst_base = self.info['v6_nat64_gen'].next()
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# This is a /96 -> the first /96 inside the /64
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v6_dst = v6_dst_base.subnets(new_prefix=self.info['v6_nat64_mask']).next()
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for v4_net in self.v4_routes[mode]:
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v4_dst = self.info['v4_nat64_map'].next()
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self.nat64_map[mode].append({
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"v6_src": v6_net['net'],
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# "v6_dst": self.info['nat64_prefix'] # static -- not supported ATM
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"v6_dst": v6_dst,
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"v4_src": v4_net['net'],
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"v4_dst": v4_dst
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})
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# allow session translation
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# TODO: maybe support multiple networks
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for mode in ["session_router"]:
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self.nat64_session_net[mode] = [
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{ 'v4_net': self.info['v4_nat64_map'].next(),
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'v6_net': self.info['nat64_prefix_dynamic'],
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'v4_idx': 1
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}
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]
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self.init_boilerplate(sw_name)
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self.init_other_port_multicast_groups()
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def gen_ndp_multicast_addr(self, addr):
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""" append the 24 bit of the address to the multicast address"""
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last_24 = int(addr) & 0xffffff
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addr = self.info['ndp_multicast'][last_24]
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return addr
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def init_other_port_multicast_groups(self):
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""" map multicast group x to send to
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all ports but x - basically broadcasting without sending back to ourselves
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"""
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# create multicast nodes
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for rid in self.ports:
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ports = [ x for x in self.ports if not x == rid ]
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n_handle = self.controller.mc_node_create(rid, ports)
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log.debug("Creating MC node rid={} ports={} handle={}".format(rid, ports, n_handle))
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g_handle = self.controller.mc_mgrp_create(rid)
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log.debug("Created MC group mgrp={} handle={} && associating afterwards".format(rid, g_handle))
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self.controller.mc_node_associate(g_handle, n_handle)
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def init_boilerplate(self, sw_name):
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self.topo = Topology(db="topology.db")
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self.sw_name = sw_name
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self.thrift_port = self.topo.get_thrift_port(sw_name)
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self.cpu_port = self.topo.get_cpu_port_index(self.sw_name)
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self.controller = SimpleSwitchAPI(self.thrift_port)
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self.intf = str(self.topo.get_cpu_port_intf(self.sw_name).replace("eth0", "eth1"))
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self.controller.reset_state()
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if self.cpu_port:
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self.controller.mirroring_add(100, self.cpu_port)
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def config(self):
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self.fill_tables()
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self.config_hosts()
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def listen_to_icmp6_multicast(self):
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"""Only needed for debugging"""
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net = self.info['ndp_multicast']
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self.controller.table_add("v6_networks", "controller_debug", [str(net)])
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def init_ndp_in_switch(self, addr):
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icmp6_addr = self.gen_ndp_multicast_addr(addr)
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icmp6_net = "{}/128".format(icmp6_addr)
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icmp6_type = table_proto['ICMP6_NS']
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mac_addr = self.info['mac_addr']
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self.controller.table_add("icmp6",
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"icmp6_neighbor_solicitation",
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[str(icmp6_net), str(icmp6_type)], [str(addr), str(mac_addr)])
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def init_icmp6_echo_in_switch(self, addr):
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icmp6_addr = addr
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icmp6_type = table_proto['ICMP6_ECHO_REQUEST']
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icmp6_net = "{}/128".format(icmp6_addr)
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self.controller.table_add("icmp6",
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"icmp6_echo_reply",
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[str(icmp6_net), str(icmp6_type)], [])
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def init_icmp_echo_in_switch(self, addr):
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icmp_addr = addr
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icmp_type = table_proto['ICMP_ECHO_REQUEST']
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icmp_net = "{}/32".format(icmp_addr)
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self.controller.table_add("icmp",
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"icmp_echo_reply",
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[str(icmp_net), str(icmp_type)], [])
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def ipv4_router(self, net):
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return net[self.info['switch_suffix']]
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def fill_tables(self):
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self.controller.table_clear("v6_networks")
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for v6route in self.v6_routes[self.mode]:
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#self.controller.table_add("v6_networks", "set_egress_port", [str(v6route['net'])], [str(v6route['port'])])
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self.controller.table_add("v6_networks", "set_egress_port_and_mac",
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[str(v6route['net'])],
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[str(v6route['port']),
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str(v6route['mac']),
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])
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self.controller.table_clear("v4_networks")
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self.controller.table_clear("v4_arp")
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self.controller.table_clear("v4_arp_egress")
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for v4route in self.v4_routes[self.mode]:
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# self.controller.table_add("v4_networks", "set_egress_port", [str(v4route['net'])], [str(v4route['port'])])
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self.controller.table_add("v4_networks", "set_egress_port_and_mac",
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[str(v4route['net'])],
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[str(v4route['port']),
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str(v4route['mac']),
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])
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# ARP support
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self.controller.table_add("v4_arp_egress", "set_egress_port", [str(v4route['net'])], [str(v4route['port'])])
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router = "{}/32".format(self.ipv4_router(v4route['net']))
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self.controller.table_add("v4_arp", "arp_reply",
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[str(self.info['mac_broadcast']),
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str(table_arp['ARP_REQUEST']),
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router],
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[str(self.info['mac_addr'])]
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)
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if self.args.multicast_to_controller:
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self.listen_to_icmp6_multicast()
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# icmp6 echo request + NDP
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self.controller.table_clear("icmp6")
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for v6addr in self.v6_addresses[self.mode]:
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self.init_ndp_in_switch(v6addr)
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self.init_icmp6_echo_in_switch(v6addr)
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# icmp echo request
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self.controller.table_clear("icmp")
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for addr in self.v4_addresses[self.mode]:
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self.init_icmp_echo_in_switch(addr)
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self.controller.table_clear("nat64")
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self.controller.table_clear("nat46")
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for nat64map in self.nat64_map[self.mode]:
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self.static_nat64_mapping(**nat64map)
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# NAT64 session based
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self.controller.table_clear("nat64_session")
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# These will be only populated dynamically
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self.controller.table_clear("nat64_tcp_session")
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self.controller.table_clear("nat46_tcp_session")
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for net in self.nat64_session_net[self.mode]:
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# Only for matching / if selecting
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self.controller.table_add("nat64_session", "NoAction",
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[
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str(net['v6_net'])
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]
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)
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def static_nat64_mapping(self, v6_src, v6_dst, v4_src, v4_dst):
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"""
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Currently using destination only matching due to non priority
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LPM support in P4
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This could be solved with ternary matches or smart double table usage
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"""
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log.info("NAT64 map: ({} -> {} => {}), ({} -> {} -> {} (only /24)))".format(
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v6_src, v6_dst, v4_dst,
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v4_src, v4_dst, v6_src))
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self.controller.table_add("nat64",
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"nat64_static",
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[str(v6_dst)],
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[str(v6_src.network_address),
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str(v4_dst.network_address),
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str(v6_dst.network_address)]
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)
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self.controller.table_add("nat46",
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"nat46_static",
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[str(v4_dst)],
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[str(v6_src.network_address),
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str(v4_dst.network_address),
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str(v6_dst.network_address)]
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)
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def config_hosts(self):
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""" Assumptions:
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- all routes are networks (no /128 v6 or /32 v4
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- hosts get the first ip address in the network
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"""
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for v6route in self.v6_routes[self.mode]:
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host = "h{}".format(v6route['port'])
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dev = "{}-eth0".format(host)
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net = v6route['net']
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ipaddr = "{}/{}".format(net[1],net.prefixlen)
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router = str(net[self.info['switch_suffix']])
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self.config_v6_host(host, str(net), str(ipaddr), dev, router)
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for v4route in self.v4_routes[self.mode]:
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host = "h{}".format(v4route['port'])
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dev = "{}-eth0".format(host)
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net = v4route['net']
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ipaddr = "{}/{}".format(net[1],net.prefixlen)
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router = str(self.ipv4_router(net))
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self.config_v4_host(host, str(net), str(ipaddr), dev, router)
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@staticmethod
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def config_v6_host(host, net, ipaddr, dev, router=None):
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log.debug("Config v6 host: {} {}->{} on {}".format(host, net, ipaddr, dev))
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subprocess.call(["mx", host, "ip", "addr", "flush", "dev", dev])
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for v6dev in [ "lo", "default", "all", dev ]:
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subprocess.call(["mx", host, "sysctl", "net.ipv6.conf.{}.disable_ipv6=0".format(v6dev)])
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# Set down & up to regain link local address
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subprocess.call(["mx", host, "ip", "link", "set", dev, "down"])
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subprocess.call(["mx", host, "ip", "link", "set", dev, "up"])
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subprocess.call(["mx", host, "ip", "addr", "add", ipaddr, "dev", dev])
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if router:
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subprocess.call(["mx", host, "ip", "route", "add", "default", "via", router])
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@staticmethod
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def config_v4_host(host, net, ipaddr, dev, router=None):
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log.debug("Config v4 host: {} {}->{} on {} via {}".format(host, net, ipaddr, dev, router))
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subprocess.call(["mx", host, "ip", "addr", "flush", "dev", dev])
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subprocess.call(["mx", host, "ip", "addr", "add", ipaddr, "dev", dev])
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if router:
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subprocess.call(["mx", host, "ip", "route", "add", "default", "via", router])
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def debug_print_pkg(self, pkg, msg="INCOMING"):
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log.debug("{}: {}".format(msg, pkg.__repr__()))
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def debug_format_pkg(self, pkg):
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packet = Ether(str(pkg))
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if packet.type == 0x800:
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ip = pkg.getlayer(IP)
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elif packet.type == 0x86dd:
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ip = pkg.getlayer(IPv6)
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# tcp = pkg.getlayer(TCP)
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# raw = pkg.getlayer(Raw)
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# return "{}:{} => {}:{}: flags={} seq={} ack={} raw={}".format(
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# ip.src, tcp.sport,
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# ip.dst, tcp.dport,
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# tcp.flags,
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# tcp.seq,
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# tcp.ack,
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# raw)
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def handle_icmp6_echo_request(self, pkg):
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"""
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Sample from the wire:
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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' |>>>
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"""
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log.info("Replying to ICMP packet")
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dst_mac = pkg[Ether].src
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src_mac = pkg[Ether].dst
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dst_addr = pkg[IPv6].src
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src_addr = pkg[IPv6].dst
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e = Ether(src=src_mac, dst=dst_mac)
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i = IPv6(src=src_addr, dst=dst_addr)
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i2 = ICMPv6EchoReply(id=pkg[ICMPv6EchoRequest].id,
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seq=pkg[ICMPv6EchoRequest].seq,
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data=pkg[ICMPv6EchoRequest].data)
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i2.cksum = None
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answer = e / i / i2
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self.send_pkg(answer)
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def handle_icmp6_ns(self, pkg):
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""" Solicitated NA"""
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# Both ways should work
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dst_mac = pkg[Ether].src
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dst_mac = pkg[ICMPv6NDOptSrcLLAddr].lladdr
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src_mac = self.info['mac_address']
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dst_addr = pkg[IPv6].src
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src_addr = pkg[ICMPv6ND_NS].tgt
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|
|
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e = Ether(src=src_mac, dst=dst_mac)
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i = IPv6(src=src_addr, dst=dst_addr)
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|
|
|
# S=1 -> solicitated
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i2 = ICMPv6ND_NA(S=1, R=0, tgt=src_addr)
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# try5: cksum not chksum !
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i2.cksum = None
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|
|
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i3 = ICMPv6NDOptDstLLAddr(lladdr=src_mac)
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|
|
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answer = e / i / i2 / i3
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|
|
|
# try 4
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# for l in [Ether, IPv6, ICMPv6ND_NA, ICMPv6NDOptDstLLAddr]:
|
|
# try:
|
|
# del answer[l].chksum
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|
# except AttributeError:
|
|
# pass
|
|
|
|
# Let scapy recalc checksum (try3)
|
|
# answer = answer.__class__(str(answer))
|
|
|
|
self.send_pkg(answer)
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|
|
|
def nat64_tcp_session_entry(self, ipv6_src_addr, ipv6_dst_addr,
|
|
tcp_src_port, tcp_dst_port):
|
|
|
|
return "{}:{} - {}:{}".format(ipv6_src_addr, tcp_src_port,
|
|
ipv6_dst_addr, tcp_dst_port)
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|
|
|
|
|
def nat64_create_tcp_session(self, pkg):
|
|
"""
|
|
session:
|
|
hdr.ipv6.src_addr: exact;
|
|
hdr.ipv6.dst_addr: exact;
|
|
hdr.tcp.src_port: exact;
|
|
hdr.tcp.dst_port: exact;
|
|
"""
|
|
|
|
|
|
id = self.nat64_tcp_session_entry(pkg[IPv6].src,
|
|
pkg[TCP].sport,
|
|
pkg[IPv6].dst,
|
|
pkg[TCP].dport)
|
|
|
|
|
|
# Has already been added? then it's a race condition and
|
|
# it needs to go back to the switch
|
|
|
|
|
|
# Not in the table? create an entry!
|
|
if not id in self.info['nat64_tcp_session']:
|
|
|
|
# FIXME: Change randomly later, supporting 1:N mappings
|
|
# Keep the same for the moment
|
|
tcp_src_port = pkg[TCP].sport
|
|
tcp_dst_port = pkg[TCP].dport
|
|
|
|
# FIXME: range, reuse, etc.
|
|
idx = self.nat64_session_net[self.mode]['v4_idx']
|
|
self.nat64_session_net[self.mode]['v4_idx'] += 1
|
|
|
|
ipv4_src_addr = self.nat64_session_net[self.mode]['v4_net'][idx]
|
|
ipv6_dst_addr = ipaddress.IPv6Address(pkg[IPv6].dst)
|
|
ipv4_dst_addr = int(ipv6_dst_addr) - int(self.nat64_session_net[self.mode]['v6_net'][0])
|
|
|
|
log.debug("src v4={}, dst v6 = {}, dst v4 = {}".format(ipv4_src_addr,
|
|
ipv6_dst_addr,
|
|
ipv4_dst_addr)
|
|
|
|
|
|
|
|
self.controller.table_add("nat64_tcp_session",
|
|
"nat64_tcp_session_translate",
|
|
[
|
|
pkg[IPv6].src,
|
|
pkg[TCP].sport,
|
|
pkg[IPv6].dst,
|
|
pkg[TCP].dport
|
|
],
|
|
[
|
|
ipv4_src_addr,
|
|
tcp_src_port,
|
|
ipv4_dst_addr,
|
|
tcp_dst_port
|
|
]
|
|
)
|
|
|
|
|
|
self.send_pkg(pkg)
|
|
|
|
|
|
|
|
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)
|
|
|
|
# Note to myself: this is actually broken for ARP
|
|
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)
|
|
elif cpu_header.task == self.task['NAT64_TCP_SESSION']:
|
|
self.nat64_create_tcp_session(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()
|