274 lines
8.9 KiB
Python
274 lines
8.9 KiB
Python
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 sniff, get_if_list, Ether, get_if_hwaddr, sendp
|
|
from scapy.all import IP, Raw, IPv6, TCP, TCP_client
|
|
from scapy.all import Ether, sniff, Packet, BitField
|
|
|
|
import sys
|
|
import re
|
|
|
|
import logging
|
|
import argparse
|
|
import subprocess
|
|
|
|
# Broken in python2
|
|
import ipaddress
|
|
|
|
logging.basicConfig()
|
|
log = logging.getLogger("main")
|
|
|
|
|
|
|
|
class CpuHeader(Packet):
|
|
name = 'CpuPacket'
|
|
fields_desc = [BitField('ingress_port', 0, 16)]
|
|
|
|
|
|
class L2Controller(object):
|
|
def __init__(self, sw_name):
|
|
# Command line mapping
|
|
self.modes = ['base', 'router']
|
|
|
|
self.info={}
|
|
self.info['ndp_multicast'] = ipaddress.ip_network(u"ff02::1:ff00:0/104")
|
|
|
|
self.address_suffix = 42
|
|
|
|
# Network / egress
|
|
self.v6_mask = "64"
|
|
|
|
self.v6_routes = {}
|
|
self.v6_routes[None] = []
|
|
self.v6_routes['base'] = []
|
|
self.v6_routes['base'].append({ "net": "2001:db8:61::", "port": "1"})
|
|
self.v6_routes['base'].append({ "net": "2001:db8:62::", "port": "2"})
|
|
self.v6_routes['router'] = self.v6_routes['base']
|
|
|
|
self.v4_mask = "24"
|
|
self.v4_routes = {}
|
|
self.v4_routes[None] = []
|
|
self.v4_routes['base'] = []
|
|
self.v4_routes['base'].append({ "net": "10.0.41.", "port": "3"})
|
|
self.v4_routes['base'].append({ "net": "10.0.42.", "port": "4"})
|
|
self.v4_routes['router'] = self.v4_routes['base']
|
|
|
|
self.v6_addresses = {}
|
|
self.v6_addresses[None] = []
|
|
self.v6_addresses['base'] = []
|
|
self.v6_addresses['router'] = [ { "addr": "{}{}".format(n['net'], self.address_suffix), "port": n['port'] } for n in self.v6_routes['router'] ]
|
|
|
|
self.v4_addresses = {}
|
|
self.v4_addresses[None] = []
|
|
self.v4_addresses['base'] = []
|
|
self.v4_addresses['router'] = [ { "addr": "{}{}".format(n['net'], self.address_suffix), "port": n['port'] } for n in self.v4_routes['router'] ]
|
|
|
|
self.init_boilerplate(sw_name)
|
|
|
|
@staticmethod
|
|
def prefix_to_net(net, mask):
|
|
""" work around ipaddress bug """
|
|
net = "{}0/{}".format(net, mask)
|
|
log.debug("net: {}".format(net))
|
|
return net
|
|
|
|
@staticmethod
|
|
def prefix_to_host(net, mask):
|
|
""" work around ipaddress bug """
|
|
host = "{}1/{}".format(net, mask)
|
|
log.debug("host: {}".format(host))
|
|
return "{}1/{}".format(net, mask)
|
|
|
|
@staticmethod
|
|
def add_host_ips(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"])
|
|
|
|
# Now add global address
|
|
subprocess.call(["mx", host, "ip", "addr", "add", ipaddr, "dev", dev])
|
|
|
|
def init_ndp(self):
|
|
""" initialise neighbor discovery protocol"""
|
|
|
|
# https://en.wikipedia.org/wiki/Solicited-node_multicast_address
|
|
ndp_prefix = "ff02::1:ff00:0/104"
|
|
|
|
all_ports = range(1,5)
|
|
# create multicast nodes
|
|
for rid in range(1,5):
|
|
ports = [ x for x in all_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("Creating MC group mgrp={} handle={} && associating afterwards".format(rid, g_handle))
|
|
|
|
self.controller.mc_node_associate(g_handle, n_handle)
|
|
|
|
|
|
self.controller.table_clear("ndp")
|
|
for port in all_ports:
|
|
self.controller.table_add("ndp", "multicast_pkg", [ndp_prefix, str(port)], [str(port)])
|
|
|
|
|
|
# Special rule for switch entries
|
|
self.controller.table_add("ndp_answer", "icmp6_neighbor_solicitation", ["ff02::1:ff00:42", "135"], ["2001:db8:61::42"])
|
|
|
|
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)
|
|
|
|
# self.init_ndp()
|
|
|
|
def config(self):
|
|
self.fill_tables()
|
|
self.config_hosts()
|
|
|
|
|
|
def fill_tables(self):
|
|
self.controller.table_clear("v6_networks")
|
|
for v6route in self.v6_routes[self.mode]:
|
|
net = self.prefix_to_net(v6route['net'], self.v6_mask)
|
|
self.controller.table_add("v6_networks", "set_egress_port", [net], [v6route['port']])
|
|
|
|
net = str(self.info['ndp_multicast'])
|
|
self.controller.table_add("v6_networks", "controller_reply", [net])
|
|
|
|
|
|
self.controller.table_clear("v4_routing")
|
|
for v4route in self.v4_routes[self.mode]:
|
|
net = self.prefix_to_net(v4route['net'], self.v4_mask)
|
|
self.controller.table_add("v4_routing", "set_egress_port", [net], [v4route['port']])
|
|
|
|
self.controller.table_clear("v6_addresses")
|
|
for v6addr in self.v6_addresses[self.mode]:
|
|
self.controller.table_add("v6_addresses", "controller_reply", [v6addr['addr']])
|
|
|
|
|
|
def gen_ndp_multicast_addr(self, addr):
|
|
""" append the 24 bit of the address to the multicast address"""
|
|
return ipaddress.ip_address(int(self.info['ndp_multicast']) + (int(addr) & 0xffffff))
|
|
|
|
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 = ipaddress.ip_network(v6route['net'])
|
|
#ipaddr = "{}/{}".format(net[1],net.prefix_length)
|
|
net = self.prefix_to_net(v6route['net'], self.v6_mask)
|
|
ipaddr = self.prefix_to_host(v6route['net'], self.v6_mask)
|
|
|
|
self.add_host_ips(host, net, ipaddr, dev)
|
|
|
|
# mx h$i "ip -6 route add default via 2001:db8:6::42"
|
|
|
|
#for v4route in self.v4_routes[self.mode]:
|
|
# Todo: add v4 routes / ip addresses
|
|
|
|
# Fake mac addresses - this gets REALLY messy now
|
|
# for host in range(4):
|
|
# macrange = [1, 2, 3, 4, 42]
|
|
|
|
# for mac in macrange:
|
|
# subprocess.call(["mx", host, "ip", "addr", "add", ipaddr, "dev", dev])
|
|
|
|
|
|
def debug_print_pkg(self, pkg, msg="INCOMING"):
|
|
#log.debug("{}: {}".format(msg, self.debug_format_pkg(pkg)))
|
|
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 recv_msg_cpu(self, pkg):
|
|
packet = Ether(str(pkg))
|
|
|
|
self.debug_print_pkg(pkg)
|
|
|
|
if packet.type == 0x0800:
|
|
pass
|
|
elif packet.type == 0x86dd:
|
|
pass
|
|
elif packet.type == 0x4242:
|
|
print("Special handling needed")
|
|
pass
|
|
elif packet.type == 0x2323:
|
|
print("Debug pkg")
|
|
pass
|
|
else:
|
|
print("Broken pkg: {}".format(pkg.__repr__()))
|
|
return
|
|
|
|
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')
|
|
|
|
self.args = parser.parse_args()
|
|
self.mode = self.args.mode
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import sys
|
|
import os
|
|
|
|
if "DEBUG" in os.environ:
|
|
log.setLevel(logging.DEBUG)
|
|
else:
|
|
log.setLevel(logging.INFO)
|
|
|
|
log.info("Booting...")
|
|
log.debug("Debug enabled.")
|
|
|
|
sw_name = "s1"
|
|
controller = L2Controller(sw_name)
|
|
|
|
controller.commandline()
|
|
if controller.args.debug:
|
|
log.setLevel(logging.DEBUG)
|
|
controller.config()
|
|
controller.run_cpu_port_loop()
|