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 # Two fragments with different ECN (Traffic Clas) bits to trigger 62 # error cases. 63 # 64 # A: Reassembly failure. 65 # R: ip6f02 dropped / Timeout (not waiting for). 66 # 67 data = "6" * 8 68 # IPTOS_ECN_NOTECT 69 ip6f01 = \ 70 sp.Ether() / \ 71 sp.IPv6(src=args.src[0], dst=args.to[0], tc=0x00) / \ 72 sp.IPv6ExtHdrFragment(offset=0, m=1, id=13) / \ 73 sp.UDP(dport=3456, sport=6543) / \ 74 data 75 # IPTOS_ECN_CE 76 ip6f02 = \ 77 sp.Ether() / \ 78 sp.IPv6(src=args.src[0], dst=args.to[0], tc=0x03) / \ 79 sp.IPv6ExtHdrFragment(offset=16, m=0, id=13) / \ 80 sp.UDP(dport=3456, sport=6543) / \ 81 data 82 if args.debug : 83 ip6f01.display() 84 ip6f02.display() 85 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 86 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 87 88 89 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## 90 # 91 # Two fragments with different ECN (Traffic Clas) bits to trigger 92 # error cases. 93 # 94 # A: Reassembly failure. 95 # R: ip6f02 dropped / Timeout (not waiting for). 96 # 97 # IPTOS_ECN_ECT1 98 ip6f01 = \ 99 sp.Ether() / \ 100 sp.IPv6(src=args.src[0], dst=args.to[0], tc=0x01) / \ 101 sp.IPv6ExtHdrFragment(offset=0, m=1, id=0x1301) / \ 102 sp.UDP(dport=3456, sport=6543) / \ 103 data 104 # IPTOS_ECN_NOTECT 105 ip6f02 = \ 106 sp.Ether() / \ 107 sp.IPv6(src=args.src[0], dst=args.to[0], tc=0x00) / \ 108 sp.IPv6ExtHdrFragment(offset=16, m=0, id=0x1301) / \ 109 sp.UDP(dport=3456, sport=6543) / \ 110 data 111 if args.debug : 112 ip6f01.display() 113 ip6f02.display() 114 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 115 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 116 117 # Wait for expiry. 118 sleep(75) 119 sys.exit(0) 120 121if __name__ == '__main__': 122 main() 123