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 check_icmp6_error_2(args, packet): 60 ip6 = packet.getlayer(sp.IPv6) 61 if not ip6: 62 return False 63 oip6 = sp.IPv6(src=args.src[0], dst=args.to[0]) 64 if ip6.dst != oip6.src: 65 return False 66 icmp6 = packet.getlayer(sp.ICMPv6TimeExceeded) 67 if not icmp6: 68 return False 69 # ICMP6_TIME_EXCEED_REASSEMBLY 1 70 if icmp6.code != 1: 71 return False 72 # Should we check the payload as well? 73 # We are running in a very isolated environment and nothing else 74 # should trigger an ICMPv6 Time Exceeded / Frag reassembly so leave it. 75 #icmp6.display() 76 return True 77 78def main(): 79 parser = argparse.ArgumentParser("frag6.py", 80 description="IPv6 fragementation test tool") 81 parser.add_argument('--sendif', nargs=1, 82 required=True, 83 help='The interface through which the packet will be sent') 84 parser.add_argument('--recvif', nargs=1, 85 required=True, 86 help='The interface on which to check for the packet') 87 parser.add_argument('--src', nargs=1, 88 required=True, 89 help='The source IP address') 90 parser.add_argument('--to', nargs=1, 91 required=True, 92 help='The destination IP address') 93 parser.add_argument('--debug', 94 required=False, action='store_true', 95 help='Enable test debugging') 96 97 args = parser.parse_args() 98 99 100 # Start sniffing on recvif 101 sniffer = Sniffer(args, check_icmp6_error) 102 sniffer2 = Sniffer(args, check_icmp6_error_2) 103 104 105 ######################################################################## 106 # 107 # Two fragments with payload and offset set to add up to >64k. 108 # 109 # Make a first fragment arrive and a second to explode everything. 110 # 111 # A: Reassembly failure. 112 # R: ICMPv6 param prob, param header. 113 # R: ICMPv6 timeout (1st frag, off=0) 114 # 115 data = "6" * 1280 116 ip6f01 = \ 117 sp.Ether() / \ 118 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 119 sp.IPv6ExtHdrFragment(offset=0, m=1, id=7) / \ 120 sp.UDP(dport=3456, sport=6543) / \ 121 data 122 ip6f02 = \ 123 sp.Ether() / \ 124 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 125 sp.IPv6ExtHdrFragment(offset=0x1fff, m=1, id=7) / \ 126 sp.UDP(dport=3456, sport=6543) / \ 127 data 128 if args.debug : 129 ip6f01.display() 130 ip6f02.display() 131 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 132 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 133 134 sleep(1.00) 135 sniffer.setEnd() 136 sniffer.join() 137 if not sniffer.foundCorrectPacket: 138 sys.exit(1) 139 140 141 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## 142 # 143 # A fragment with payload and offset set to add up to >64k. 144 # 145 # Try again with the first packet to make things explode. 146 # 147 # A: Reassembly failure. 148 # R: ICMPv6 param prob, param header. 149 # 150 151 # Start sniffing on recvif 152 sniffer = Sniffer(args, check_icmp6_error) 153 154 ip6f01 = \ 155 sp.Ether() / \ 156 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 157 sp.IPv6ExtHdrFragment(offset=0x1fff, m=1, id=0x7001) / \ 158 sp.UDP(dport=3456, sport=6543) / \ 159 data 160 if args.debug : 161 ip6f01.display() 162 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 163 164 sleep(0.10) 165 sniffer.setEnd() 166 sniffer.join() 167 if not sniffer.foundCorrectPacket: 168 sys.exit(1) 169 170 # Wait for expiry from first test run. 171 sleep(3) 172 sniffer2.setEnd() 173 sniffer2.join() 174 if not sniffer2.foundCorrectPacket: 175 sys.exit(1) 176 177 sys.exit(0) 178 179if __name__ == '__main__': 180 main() 181