3 # SPDX-License-Identifier: BSD-2-Clause
5 # Copyright (c) 2019 Netflix, Inc.
7 # Redistribution and use in source and binary forms, with or without
8 # modification, are permitted provided that the following conditions
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.
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
33 logging.getLogger("scapy").setLevel(logging.CRITICAL)
34 import scapy.all as sp
37 from sniffer import Sniffer
38 from time import sleep
40 def check_icmp6_error(args, packet):
41 ip6 = packet.getlayer(sp.IPv6)
44 oip6 = sp.IPv6(src=args.src[0], dst=args.to[0])
45 if ip6.dst != oip6.src:
47 icmp6 = packet.getlayer(sp.ICMPv6ParamProblem)
50 # ICMP6_PARAMPROB_HEADER 0
53 # Should we check the payload as well?
54 # We are running in a very isolated environment and nothing else
55 # should trigger an ICMPv6 Param Prob so leave it.
59 def check_icmp6_error_2(args, packet):
60 ip6 = packet.getlayer(sp.IPv6)
63 oip6 = sp.IPv6(src=args.src[0], dst=args.to[0])
64 if ip6.dst != oip6.src:
66 icmp6 = packet.getlayer(sp.ICMPv6TimeExceeded)
69 # ICMP6_TIME_EXCEED_REASSEMBLY 1
72 # Should we check the payload as well?
73 # We are running in a very isolated environment and nothing else
74 # should trigger an ICMPv6 Time Exceeded / Frag reassembly so leave it.
80 parser = argparse.ArgumentParser("frag6.py",
81 description="IPv6 fragementation test tool")
82 parser.add_argument('--sendif', nargs=1,
84 help='The interface through which the packet will be sent')
85 parser.add_argument('--recvif', nargs=1,
87 help='The interface on which to check for the packet')
88 parser.add_argument('--src', nargs=1,
90 help='The source IP address')
91 parser.add_argument('--to', nargs=1,
93 help='The destination IP address')
94 parser.add_argument('--debug',
95 required=False, action='store_true',
96 help='Enable test debugging')
98 args = parser.parse_args()
101 # Start sniffing on recvif
102 sniffer = Sniffer(args, check_icmp6_error)
103 sniffer2 = Sniffer(args, check_icmp6_error_2)
106 ########################################################################
108 # A fragment with payload and offset set to add up to >64k when
109 # another frag with offset=0 arrives and has an unfrag part.
110 # This is us checking for all fragments queued already when the
111 # one with off=0 arrives. Note: unless the off=0 has its own problem
112 # it will be queued and off!=0 ones might be expunged with param prob.
114 # A: Reassembly failure, timeout after
115 # R: ICMPv6 param prob, param header (1st frag)
116 # R: ICMPv6 time exceeded (2nd frag, as off=0)
121 sp.IPv6(src=args.src[0], dst=args.to[0]) / \
122 sp.IPv6ExtHdrFragment(offset=0x1ffc, m=0, id=8) / \
123 sp.UDP(dport=3456, sport=6543) / \
128 sp.IPv6(src=args.src[0], dst=args.to[0]) / \
129 sp.IPv6ExtHdrDestOpt(options = \
130 sp.PadN(optdata="\x00\x00\x00\x00\x00\x00")) / \
131 sp.IPv6ExtHdrFragment(offset=0, m=1, id=8) / \
132 sp.UDP(dport=3456, sport=6543) / \
137 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False)
138 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False)
143 if not sniffer.foundCorrectPacket:
148 if not sniffer2.foundCorrectPacket:
153 if __name__ == '__main__':