xref: /freebsd/tests/sys/netinet6/frag6/frag6_01.py (revision a3557ef0)
1#!/usr/bin/env python
2#-
3# SPDX-License-Identifier: BSD-2-Clause
4#
5# Copyright (c) 2019 Netflix, Inc.
6#
7# Redistribution and use in source and binary forms, with or without
8# modification, are permitted provided that the following conditions
9# are met:
10# 1. Redistributions of source code must retain the above copyright
11#    notice, this list of conditions and the following disclaimer.
12# 2. Redistributions in binary form must reproduce the above copyright
13#    notice, this list of conditions and the following disclaimer in the
14#    documentation and/or other materials provided with the distribution.
15#
16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26# SUCH DAMAGE.
27#
28# $FreeBSD$
29#
30
31import argparse
32import scapy.all as sp
33import socket
34import sys
35from sniffer import Sniffer
36from time import sleep
37
38def check_icmp6_error(args, packet):
39	ip6 = packet.getlayer(sp.IPv6)
40	if not ip6:
41		return False
42	oip6 = sp.IPv6(src=args.src[0], dst=args.to[0])
43	if ip6.dst != oip6.src:
44		return False
45	icmp6 = packet.getlayer(sp.ICMPv6ParamProblem)
46	if not icmp6:
47		return False
48	# ICMP6_PARAMPROB_HEADER 0
49	if icmp6.code != 0:
50		return False
51	# Should we check the payload as well?
52	# We are running in a very isolated environment and nothing else
53	# should trigger an ICMPv6 Param Prob so leave it.
54	#icmp6.display()
55	return True
56
57def main():
58	parser = argparse.ArgumentParser("frag6.py",
59		description="IPv6 fragementation test tool")
60	parser.add_argument('--sendif', nargs=1,
61		required=True,
62		help='The interface through which the packet will be sent')
63	parser.add_argument('--recvif', nargs=1,
64		required=True,
65		help='The interface on which to check for the packet')
66	parser.add_argument('--src', nargs=1,
67		required=True,
68		help='The source IP address')
69	parser.add_argument('--to', nargs=1,
70		required=True,
71		help='The destination IP address')
72	parser.add_argument('--debug',
73		required=False, action='store_true',
74		help='Enable test debugging')
75
76	args = parser.parse_args()
77
78
79	# Start sniffing on recvif
80	sniffer = Sniffer(args, check_icmp6_error)
81
82
83	########################################################################
84	#
85	# A single start fragment with zero length IPv6 header (jumbo).
86	# Make sure we do hit the Fragment case, which is tricky as the
87	# jumbogram needs to be > 64k.
88	#
89	# A:  Jumbo-Fragment not allowed.
90	# R:  ICMPv6 param problem.
91	#
92	#data = "6" * (65536 - 2 - 6 - 8 - 8)
93	data = "6" * 65512
94	ip6f01 = sp.Ether() / \
95		sp.IPv6(src=args.src[0], dst=args.to[0], plen=0) / \
96		sp.IPv6ExtHdrHopByHop(options=sp.Jumbo(jumboplen=65536)) / \
97		sp.IPv6ExtHdrFragment(offset=0, m=1, id=6) / \
98		sp.UDP(dport=3456, sport=6543) / \
99		data
100	if args.debug :
101		ip6f01.display()
102	sp.sendp(ip6f01, iface=args.sendif[0], verbose=False)
103
104	# We should only need to sleep 0.10 but it seems scapy
105	# takes time for this one.
106	sleep(75)
107	sniffer.setEnd()
108	sniffer.join()
109	if not sniffer.foundCorrectPacket:
110		sys.exit(1)
111
112	sys.exit(0)
113
114if __name__ == '__main__':
115	main()
116