#!/usr/bin/env python3
-# Copyright (c) 2020 Cisco and/or its affiliates.
+# Copyright (c) 2022 Cisco and/or its affiliates.
#
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
#
# Note: If this file is linked with Scapy, which is GPLv2+, your use of it
# must be under GPLv2+. If at any point in the future it is no longer linked
-# with Scapy (or other GPLv2+ licensed software), you are free to choose Apache 2.
+# with Scapy (or other GPLv2+ licensed software), you are free to choose
+# Apache 2.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
from ipaddress import ip_address
from scapy.layers.inet import IP
-from scapy.layers.inet6 import IPv6, ICMPv6ND_NS
+from scapy.layers.inet6 import IPv6, ICMPv6ND_NS, ICMPv6MLReport2, ICMPv6ND_RA
from scapy.layers.ipsec import SecurityAssociation, ESP
from scapy.layers.l2 import Ether
from scapy.packet import Raw
if not pkt_recv.haslayer(ip_layer):
raise RuntimeError(
- f"Not an {ip_layer.__name__} packet received: {pkt_recv!r}"
+ f"Not an {ip_layer.name} packet received: {pkt_recv!r}"
)
if pkt_recv[ip_layer].src != src_tun:
ip_pkt = pkt_recv[ip_layer]
d_pkt = sa_in.decrypt(ip_pkt)
- print(u"Decrypted packet:")
- d_pkt.show2()
- print()
if d_pkt[ip_layer].dst != dst_ip:
raise RuntimeError(
if not pkt_recv.haslayer(ip_layer):
raise RuntimeError(
- f"Not an {ip_layer.__name__} packet received: {pkt_recv!r}"
+ f"Not an {ip_layer.name} packet received: {pkt_recv!r}"
)
if pkt_recv[ip_layer].dst != dst_ip:
raise RuntimeError(
f"Received packet has invalid destination address: "
- f"{pkt_recv[ip_layer.__name__].dst} should be: {dst_ip}"
+ f"{pkt_recv[ip_layer.name].dst} should be: {dst_ip}"
)
if pkt_recv[ip_layer].src != src_ip:
raise RuntimeError(
f"Received packet has invalid destination address: "
- f"{pkt_recv[ip_layer.__name__].dst} should be: {src_ip}"
+ f"{pkt_recv[ip_layer.name].dst} should be: {src_ip}"
)
if ip_layer == IP and pkt_recv[ip_layer].proto != 61:
sa_in = SecurityAssociation(
ESP, spi=l_spi, crypt_algo=crypto_alg,
crypt_key=crypto_key.encode(encoding=u"utf-8"), auth_algo=integ_alg,
- auth_key=integ_key.encode(encoding=u"utf-8"),
- tunnel_header=tunnel_in
+ auth_key=integ_key.encode(encoding=u"utf-8"), tunnel_header=tunnel_in
)
sa_out = SecurityAssociation(
ESP, spi=r_spi, crypt_algo=crypto_alg,
crypt_key=crypto_key.encode(encoding=u"utf-8"), auth_algo=integ_alg,
- auth_key=integ_key.encode(encoding=u"utf-8"),
- tunnel_header=tunnel_out
+ auth_key=integ_key.encode(encoding=u"utf-8"), tunnel_header=tunnel_out
)
sent_packets = list()
- tx_pkt_send = (Ether(src=tx_src_mac, dst=tx_dst_mac) / ip_pkt)
+ tx_pkt_send = (
+ Ether(src=tx_src_mac, dst=tx_dst_mac) / ip_pkt)
tx_pkt_send /= Raw()
size_limit = 78 if ip_layer == IPv6 else 64
if len(tx_pkt_send) < size_limit:
rx_pkt_recv = rx_rxq.recv(2)
if rx_pkt_recv is None:
- raise RuntimeError(f"{ip_layer.__name__} packet Rx timeout")
+ raise RuntimeError(f"{ip_layer.name} packet Rx timeout")
if rx_pkt_recv.haslayer(ICMPv6ND_NS):
# read another packet in the queue if the current one is ICMPv6ND_NS
continue
- else:
- # otherwise process the current packet
- break
+ if rx_pkt_recv.haslayer(ICMPv6MLReport2):
+ # read another packet in the queue if the current one is
+ # ICMPv6MLReport2
+ continue
+ if rx_pkt_recv.haslayer(ICMPv6ND_RA):
+ # read another packet in the queue if the current one is
+ # ICMPv6ND_RA
+ continue
+
+ # otherwise process the current packet
+ break
check_ipsec(
rx_pkt_recv, ip_layer, rx_src_mac, rx_dst_mac, src_tun, dst_tun, src_ip,
dst_ip, sa_in
)
- ip_pkt = ip_layer(src=dst_ip, dst=src_ip, proto=61) if ip_layer == IP \
+ rx_ip_pkt = ip_layer(src=dst_ip, dst=src_ip, proto=61) if ip_layer == IP \
else ip_layer(src=dst_ip, dst=src_ip)
- ip_pkt /= Raw()
- if len(ip_pkt) < (size_limit - 14):
- ip_pkt[Raw].load += (b"\0" * (size_limit - 14 - len(ip_pkt)))
- e_pkt = sa_out.encrypt(ip_pkt)
- rx_pkt_send = (Ether(src=rx_dst_mac, dst=rx_src_mac) /
- e_pkt)
+ rx_ip_pkt /= Raw()
+ if len(rx_ip_pkt) < (size_limit - 14):
+ rx_ip_pkt[Raw].load += (b"\0" * (size_limit - 14 - len(rx_ip_pkt)))
+ rx_pkt_send = (
+ Ether(src=rx_dst_mac, dst=rx_src_mac) / sa_out.encrypt(rx_ip_pkt))
rx_txq.send(rx_pkt_send)
while True:
tx_pkt_recv = tx_rxq.recv(2, ignore=sent_packets)
if tx_pkt_recv is None:
- raise RuntimeError(f"{ip_layer.__name__} packet Rx timeout")
+ raise RuntimeError(f"{ip_layer.name} packet Rx timeout")
if tx_pkt_recv.haslayer(ICMPv6ND_NS):
# read another packet in the queue if the current one is ICMPv6ND_NS
continue
- else:
- # otherwise process the current packet
- break
+ if tx_pkt_recv.haslayer(ICMPv6MLReport2):
+ # read another packet in the queue if the current one is
+ # ICMPv6MLReport2
+ continue
+ if tx_pkt_recv.haslayer(ICMPv6ND_RA):
+ # read another packet in the queue if the current one is
+ # ICMPv6ND_RA
+ continue
- check_ip(tx_pkt_recv, ip_layer, tx_dst_mac, tx_src_mac, dst_ip, src_ip)
+ break
- sys.exit(0)
+ check_ip(tx_pkt_recv, ip_layer, tx_dst_mac, tx_src_mac, dst_ip, src_ip)
if __name__ == u"__main__":