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 # Two fragments with different ECN (Traffic Clas) bits to trigger 64 # error cases. 65 # 66 # A: Reassembly failure. 67 # R: ip6f02 dropped / Timeout (not waiting for). 68 # 69 data = "6" * 8 70 # IPTOS_ECN_NOTECT 71 ip6f01 = \ 72 sp.Ether() / \ 73 sp.IPv6(src=args.src[0], dst=args.to[0], tc=0x00) / \ 74 sp.IPv6ExtHdrFragment(offset=0, m=1, id=13) / \ 75 sp.UDP(dport=3456, sport=6543) / \ 76 data 77 # IPTOS_ECN_CE 78 ip6f02 = \ 79 sp.Ether() / \ 80 sp.IPv6(src=args.src[0], dst=args.to[0], tc=0x03) / \ 81 sp.IPv6ExtHdrFragment(offset=16, m=0, id=13) / \ 82 sp.UDP(dport=3456, sport=6543) / \ 83 data 84 if args.debug : 85 ip6f01.display() 86 ip6f02.display() 87 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 88 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 89 90 91 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## 92 # 93 # Two fragments with different ECN (Traffic Clas) bits to trigger 94 # error cases. 95 # 96 # A: Reassembly failure. 97 # R: ip6f02 dropped / Timeout (not waiting for). 98 # 99 # IPTOS_ECN_ECT1 100 ip6f01 = \ 101 sp.Ether() / \ 102 sp.IPv6(src=args.src[0], dst=args.to[0], tc=0x01) / \ 103 sp.IPv6ExtHdrFragment(offset=0, m=1, id=0x1301) / \ 104 sp.UDP(dport=3456, sport=6543) / \ 105 data 106 # IPTOS_ECN_NOTECT 107 ip6f02 = \ 108 sp.Ether() / \ 109 sp.IPv6(src=args.src[0], dst=args.to[0], tc=0x00) / \ 110 sp.IPv6ExtHdrFragment(offset=16, m=0, id=0x1301) / \ 111 sp.UDP(dport=3456, sport=6543) / \ 112 data 113 if args.debug : 114 ip6f01.display() 115 ip6f02.display() 116 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 117 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 118 119 # Wait for expiry. 120 sleep(3) 121 sys.exit(0) 122 123if __name__ == '__main__': 124 main() 125