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 time import sleep 36 37def main(): 38 parser = argparse.ArgumentParser("frag6.py", 39 description="IPv6 fragementation test tool") 40 parser.add_argument('--sendif', nargs=1, 41 required=True, 42 help='The interface through which the packet will be sent') 43 parser.add_argument('--recvif', nargs=1, 44 required=True, 45 help='The interface on which to check for the packet') 46 parser.add_argument('--src', nargs=1, 47 required=True, 48 help='The source IP address') 49 parser.add_argument('--to', nargs=1, 50 required=True, 51 help='The destination IP address') 52 parser.add_argument('--debug', 53 required=False, action='store_true', 54 help='Enable test debugging') 55 56 args = parser.parse_args() 57 58 59 ######################################################################## 60 # 61 # Send multiple fragments, with an exact overlap in a middle one, 62 # not finishing the full packet (and ignoring the content anyway). 63 # 64 # A: Reassembly failure. 65 # R: dup dropped silently / Timeout (not waiting for). 66 # 67 data = "6" * 8 68 ip6f01 = \ 69 sp.Ether() / \ 70 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 71 sp.IPv6ExtHdrFragment(offset=0, m=1, id=14) / \ 72 sp.UDP(dport=3456, sport=6543) / \ 73 data 74 ip6f02 = \ 75 sp.Ether() / \ 76 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 77 sp.IPv6ExtHdrFragment(offset=0x1000, m=0, id=14) / \ 78 sp.UDP(dport=3456, sport=6543) / \ 79 data 80 ip6f03 = \ 81 sp.Ether() / \ 82 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 83 sp.IPv6ExtHdrFragment(offset=16, m=1, id=14) / \ 84 sp.UDP(dport=3456, sport=6543) / \ 85 data 86 ip6f04 = \ 87 sp.Ether() / \ 88 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 89 sp.IPv6ExtHdrFragment(offset=16, m=1, id=14) / \ 90 sp.UDP(dport=3456, sport=6543) / \ 91 data 92 if args.debug : 93 ip6f01.display() 94 ip6f02.display() 95 ip6f03.display() 96 ip6f04.display() 97 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 98 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 99 sp.sendp(ip6f03, iface=args.sendif[0], verbose=False) 100 sp.sendp(ip6f04, iface=args.sendif[0], verbose=False) 101 102 103 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## 104 # 105 # Send multiple fragments, with a partial overlap on the first one 106 # not finishing the full packet (and ignoring the content anyway). 107 # The second packet needs to be the first one in the fragment chain 108 # in order to trigger the 2nd case to test. 109 # 110 # A: Reassembly failure. 111 # R: dup dropped silently / Timeout (not waiting for). 112 # 113 data = "6" * 8 114 ip6f01 = \ 115 sp.Ether() / \ 116 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 117 sp.IPv6ExtHdrFragment(offset=10, m=1, id=0x1401) / \ 118 sp.UDP(dport=3456, sport=6543) / \ 119 data 120 ip6f02 = \ 121 sp.Ether() / \ 122 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 123 sp.IPv6ExtHdrFragment(offset=9, m=0, id=0x1401) / \ 124 sp.UDP(dport=3456, sport=6543) / \ 125 data 126 if args.debug : 127 ip6f01.display() 128 ip6f02.display() 129 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 130 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 131 132 # Wait for expiry. 133 sleep(75) 134 sys.exit(0) 135 136if __name__ == '__main__': 137 main() 138