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# 29 30import argparse 31import logging 32logging.getLogger("scapy").setLevel(logging.CRITICAL) 33import scapy.all as sp 34import socket 35import sys 36from time import sleep 37 38def main(): 39 parser = argparse.ArgumentParser("frag6.py", 40 description="IPv6 fragementation test tool") 41 parser.add_argument('--sendif', nargs=1, 42 required=True, 43 help='The interface through which the packet will be sent') 44 parser.add_argument('--recvif', nargs=1, 45 required=True, 46 help='The interface on which to check for the packet') 47 parser.add_argument('--src', nargs=1, 48 required=True, 49 help='The source IP address') 50 parser.add_argument('--to', nargs=1, 51 required=True, 52 help='The destination IP address') 53 parser.add_argument('--debug', 54 required=False, action='store_true', 55 help='Enable test debugging') 56 57 args = parser.parse_args() 58 59 60 ######################################################################## 61 # 62 # Send multiple fragments, with an exact overlap in a middle one, 63 # not finishing the full packet (and ignoring the content anyway). 64 # 65 # A: Reassembly failure. 66 # R: dup dropped silently / Timeout (not waiting for). 67 # 68 data = "6" * 8 69 ip6f01 = \ 70 sp.Ether() / \ 71 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 72 sp.IPv6ExtHdrFragment(offset=0, m=1, id=14) / \ 73 sp.UDP(dport=3456, sport=6543) / \ 74 data 75 ip6f02 = \ 76 sp.Ether() / \ 77 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 78 sp.IPv6ExtHdrFragment(offset=0x1000, m=0, id=14) / \ 79 sp.UDP(dport=3456, sport=6543) / \ 80 data 81 ip6f03 = \ 82 sp.Ether() / \ 83 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 84 sp.IPv6ExtHdrFragment(offset=16, m=1, id=14) / \ 85 sp.UDP(dport=3456, sport=6543) / \ 86 data 87 ip6f04 = \ 88 sp.Ether() / \ 89 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 90 sp.IPv6ExtHdrFragment(offset=16, m=1, id=14) / \ 91 sp.UDP(dport=3456, sport=6543) / \ 92 data 93 if args.debug : 94 ip6f01.display() 95 ip6f02.display() 96 ip6f03.display() 97 ip6f04.display() 98 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 99 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 100 sp.sendp(ip6f03, iface=args.sendif[0], verbose=False) 101 sp.sendp(ip6f04, iface=args.sendif[0], verbose=False) 102 103 104 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## 105 # 106 # Send multiple fragments, with a partial overlap on the first one 107 # not finishing the full packet (and ignoring the content anyway). 108 # The second packet needs to be the first one in the fragment chain 109 # in order to trigger the 2nd case to test. 110 # 111 # A: Reassembly failure. 112 # R: dup dropped silently / Timeout (not waiting for). 113 # 114 data = "6" * 8 115 ip6f01 = \ 116 sp.Ether() / \ 117 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 118 sp.IPv6ExtHdrFragment(offset=10, m=1, id=0x1401) / \ 119 sp.UDP(dport=3456, sport=6543) / \ 120 data 121 ip6f02 = \ 122 sp.Ether() / \ 123 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 124 sp.IPv6ExtHdrFragment(offset=9, m=0, id=0x1401) / \ 125 sp.UDP(dport=3456, sport=6543) / \ 126 data 127 if args.debug : 128 ip6f01.display() 129 ip6f02.display() 130 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 131 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 132 133 # Wait for expiry. 134 sleep(3) 135 sys.exit(0) 136 137if __name__ == '__main__': 138 main() 139