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Initial icmp6_na support in controller

This commit is contained in:
Nico Schottelius 2019-03-05 16:59:27 +01:00
parent 356f664019
commit a139ad6e83
1 changed files with 27 additions and 2 deletions
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29
p4app/controller.py
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@ -10,7 +10,7 @@ from scapy.all import sniff, get_if_list, Ether, get_if_hwaddr, sendp
from scapy.all import IP, Raw, IPv6, TCP, TCP_client, Ether from scapy.all import IP, Raw, IPv6, TCP, TCP_client, Ether
from scapy.all import sniff from scapy.all import sniff
from scapy.all import Packet, BitField, IntEnumField, ShortField, XShortEnumField, ShortEnumField from scapy.all import Packet, BitField, IntEnumField, ShortField, XShortEnumField, ShortEnumField
from scapy.all import ICMPv6ND_NS, ICMPv6ND_RS from scapy.all import ICMPv6ND_NS, ICMPv6ND_RS, ICMPv6NDOptSrcLLAddr, ICMPv6ND_NS, ICMPv6ND_NA
from scapy.data import ETHER_TYPES from scapy.data import ETHER_TYPES
import sys import sys
@ -52,6 +52,7 @@ class L2Controller(object):
self.info={} self.info={}
self.info['ndp_multicast'] = ipaddress.ip_network("ff02::1:ff00:0/104") self.info['ndp_multicast'] = ipaddress.ip_network("ff02::1:ff00:0/104")
self.info['mac_address'] = "00:00:0a:00:00:42"
self.info['v6_mask'] = 64 self.info['v6_mask'] = 64
self.info['v6_base'] = ipaddress.ip_network("2001:db8::/32") self.info['v6_base'] = ipaddress.ip_network("2001:db8::/32")
@ -229,6 +230,29 @@ class L2Controller(object):
# tcp.ack, # tcp.ack,
# raw) # raw)
def handle_icmp6_ns(self, pkg):
""" Solicitated NA"""
# Both ways should work
dst_mac = pkg[Ether].src
dst_mac = pkg[ICMPv6NDOptSrcLLAddr].src
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, tgt=src_addr)
i3 = ICMPv6NDOptSrcLLAddr(lladdr=src_mac)
answer = e / i / i2 / i3
sendp(answer, iface=self.intf, verbose=False)
def recv_msg_cpu(self, pkg): def recv_msg_cpu(self, pkg):
packet = Ether(str(pkg)) packet = Ether(str(pkg))
@ -245,12 +269,13 @@ class L2Controller(object):
ether_orig = Ether(src=packet.src, dst=packet.dst, type=cpu_header.type) ether_orig = Ether(src=packet.src, dst=packet.dst, type=cpu_header.type)
orig_packet = ether_orig / IPv6(cpu_header.load) orig_packet = ether_orig / IPv6(cpu_header.load)
log.debug("o={}".format(orig_packet.__repr__())) log.debug("reassambled={}".format(orig_packet.__repr__()))
if cpu_header.task == self.task['DEBUG']: if cpu_header.task == self.task['DEBUG']:
log.debug("Debug purpose only") log.debug("Debug purpose only")
elif cpu_header.task == self.task['ICMP6_NS']: elif cpu_header.task == self.task['ICMP6_NS']:
log.debug("Doing neighbor solicitation") log.debug("Doing neighbor solicitation")
self.handle_icmp6_ns(orig_packet)
elif cpu_header.task == self.task['ICMP6_GENERAL']: elif cpu_header.task == self.task['ICMP6_GENERAL']:
log.debug("Replying to ICMP packet") log.debug("Replying to ICMP packet")