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 sniffer import Sniffer 38from time import sleep 39 40def check_icmp6_error(args, packet): 41 ip6 = packet.getlayer(sp.IPv6) 42 if not ip6: 43 return False 44 oip6 = sp.IPv6(src=args.src[0], dst=args.to[0]) 45 if ip6.dst != oip6.src: 46 return False 47 icmp6 = packet.getlayer(sp.ICMPv6ParamProblem) 48 if not icmp6: 49 return False 50 # ICMP6_PARAMPROB_HEADER 0 51 if icmp6.code != 0: 52 return False 53 # Should we check the payload as well? 54 # We are running in a very isolated environment and nothing else 55 # should trigger an ICMPv6 Param Prob so leave it. 56 #icmp6.display() 57 return True 58 59def main(): 60 parser = argparse.ArgumentParser("frag6.py", 61 description="IPv6 fragementation test tool") 62 parser.add_argument('--sendif', nargs=1, 63 required=True, 64 help='The interface through which the packet will be sent') 65 parser.add_argument('--recvif', nargs=1, 66 required=True, 67 help='The interface on which to check for the packet') 68 parser.add_argument('--src', nargs=1, 69 required=True, 70 help='The source IP address') 71 parser.add_argument('--to', nargs=1, 72 required=True, 73 help='The destination IP address') 74 parser.add_argument('--debug', 75 required=False, action='store_true', 76 help='Enable test debugging') 77 78 args = parser.parse_args() 79 80 81 # Start sniffing on recvif 82 sniffer = Sniffer(args, check_icmp6_error) 83 84 85 ######################################################################## 86 # 87 # 0-byte first fragment. 88 # 89 # A: 0-byte fragment payload not allowed. Discarded. 90 # R: ICMPv6 param prob, paramprob header. 91 # 92 ip6f01 = sp.Ether() / \ 93 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 94 sp.IPv6ExtHdrFragment(offset=0, m=1, id=4) 95 if args.debug : 96 ip6f01.display() 97 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 98 99 sleep(0.10) 100 sniffer.setEnd() 101 sniffer.join() 102 if not sniffer.foundCorrectPacket: 103 sys.exit(1) 104 105 sys.exit(0) 106 107if __name__ == '__main__': 108 main() 109