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 # Sysctl set to accept maximum 3 segments on a fragmented packet. 64 # The 4th packet will flush the entire q6. 65 # 66 # A: 4 Discarded. 67 # R: Silence (statistics only) no ICMPv6 as we skip the off=0 segment. 68 # 69 data = "66666666" 70 for i in range(4): 71 foffset=16 + (i * (0x100 + (int)(16 / 8))) 72 ip6f01 = sp.Ether() / \ 73 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 74 sp.IPv6ExtHdrFragment(offset=foffset, m=1, id=15) / \ 75 sp.UDP(dport=3456, sport=6543) / \ 76 data 77 if args.debug : 78 ip6f01.display() 79 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 80 81 82 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## 83 # 84 # Sysctl set to accept maximum 3 segments on a fragmented packet. 85 # The 4th packet will flush the entire q6. 86 # This time we play proper offset/length games on the packets in order 87 # to trigger the 2nd test case, with the last packet still having m=1. 88 # 89 # A: 4 Discarded. 90 # R: ICMPv6 timeout expired. 91 # 92 data = "66666666" 93 for i in range(4): 94 foffset=(i * (int)(16 / 8)) 95 ip6f01 = sp.Ether() / \ 96 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 97 sp.IPv6ExtHdrFragment(offset=foffset, m=1, id=0x1501) / \ 98 sp.UDP(dport=3456, sport=6543) / \ 99 data 100 if args.debug : 101 ip6f01.display() 102 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 103 104 sys.exit(0) 105 106if __name__ == '__main__': 107 main() 108