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 logging 33logging.getLogger("scapy").setLevel(logging.CRITICAL) 34import scapy.all as sp 35import socket 36import sys 37from time import sleep 38 39def main(): 40 parser = argparse.ArgumentParser("frag6.py", 41 description="IPv6 fragementation test tool") 42 parser.add_argument('--sendif', nargs=1, 43 required=True, 44 help='The interface through which the packet will be sent') 45 parser.add_argument('--recvif', nargs=1, 46 required=True, 47 help='The interface on which to check for the packet') 48 parser.add_argument('--src', nargs=1, 49 required=True, 50 help='The source IP address') 51 parser.add_argument('--to', nargs=1, 52 required=True, 53 help='The destination IP address') 54 parser.add_argument('--debug', 55 required=False, action='store_true', 56 help='Enable test debugging') 57 58 args = parser.parse_args() 59 60 61 ######################################################################## 62 # 63 # Send multiple fragments, with an exact overlap in a middle one, 64 # not finishing the full packet (and ignoring the content anyway). 65 # 66 # A: Reassembly failure. 67 # R: dup dropped silently / Timeout (not waiting for). 68 # 69 data = "6" * 8 70 ip6f01 = \ 71 sp.Ether() / \ 72 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 73 sp.IPv6ExtHdrFragment(offset=0, m=1, id=14) / \ 74 sp.UDP(dport=3456, sport=6543) / \ 75 data 76 ip6f02 = \ 77 sp.Ether() / \ 78 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 79 sp.IPv6ExtHdrFragment(offset=0x1000, m=0, id=14) / \ 80 sp.UDP(dport=3456, sport=6543) / \ 81 data 82 ip6f03 = \ 83 sp.Ether() / \ 84 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 85 sp.IPv6ExtHdrFragment(offset=16, m=1, id=14) / \ 86 sp.UDP(dport=3456, sport=6543) / \ 87 data 88 ip6f04 = \ 89 sp.Ether() / \ 90 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 91 sp.IPv6ExtHdrFragment(offset=16, m=1, id=14) / \ 92 sp.UDP(dport=3456, sport=6543) / \ 93 data 94 if args.debug : 95 ip6f01.display() 96 ip6f02.display() 97 ip6f03.display() 98 ip6f04.display() 99 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 100 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 101 sp.sendp(ip6f03, iface=args.sendif[0], verbose=False) 102 sp.sendp(ip6f04, iface=args.sendif[0], verbose=False) 103 104 105 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## 106 # 107 # Send multiple fragments, with a partial overlap on the first one 108 # not finishing the full packet (and ignoring the content anyway). 109 # The second packet needs to be the first one in the fragment chain 110 # in order to trigger the 2nd case to test. 111 # 112 # A: Reassembly failure. 113 # R: dup dropped silently / Timeout (not waiting for). 114 # 115 data = "6" * 8 116 ip6f01 = \ 117 sp.Ether() / \ 118 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 119 sp.IPv6ExtHdrFragment(offset=10, m=1, id=0x1401) / \ 120 sp.UDP(dport=3456, sport=6543) / \ 121 data 122 ip6f02 = \ 123 sp.Ether() / \ 124 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 125 sp.IPv6ExtHdrFragment(offset=9, m=0, id=0x1401) / \ 126 sp.UDP(dport=3456, sport=6543) / \ 127 data 128 if args.debug : 129 ip6f01.display() 130 ip6f02.display() 131 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 132 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 133 134 # Wait for expiry. 135 sleep(75) 136 sys.exit(0) 137 138if __name__ == '__main__': 139 main() 140