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# 29 30import argparse 31import logging 32logging.getLogger("scapy").setLevel(logging.CRITICAL) 33import scapy.all as sp 34import socket 35import sys 36from sniffer import Sniffer 37from time import sleep 38 39def check_icmp6_error(args, packet): 40 ip6 = packet.getlayer(sp.IPv6) 41 if not ip6: 42 return False 43 oip6 = sp.IPv6(src=args.src[0], dst=args.to[0]) 44 if ip6.dst != oip6.src: 45 return False 46 icmp6 = packet.getlayer(sp.ICMPv6ParamProblem) 47 if not icmp6: 48 return False 49 # ICMP6_PARAMPROB_HEADER 0 50 if icmp6.code != 0: 51 return False 52 # Should we check the payload as well? 53 # We are running in a very isolated environment and nothing else 54 # should trigger an ICMPv6 Param Prob so leave it. 55 #icmp6.display() 56 return True 57 58def check_icmp6_error_2(args, packet): 59 ip6 = packet.getlayer(sp.IPv6) 60 if not ip6: 61 return False 62 oip6 = sp.IPv6(src=args.src[0], dst=args.to[0]) 63 if ip6.dst != oip6.src: 64 return False 65 icmp6 = packet.getlayer(sp.ICMPv6TimeExceeded) 66 if not icmp6: 67 return False 68 # ICMP6_TIME_EXCEED_REASSEMBLY 1 69 if icmp6.code != 1: 70 return False 71 # Should we check the payload as well? 72 # We are running in a very isolated environment and nothing else 73 # should trigger an ICMPv6 Time Exceeded / Frag reassembly so leave it. 74 #icmp6.display() 75 return True 76 77def main(): 78 parser = argparse.ArgumentParser("frag6.py", 79 description="IPv6 fragementation test tool") 80 parser.add_argument('--sendif', nargs=1, 81 required=True, 82 help='The interface through which the packet will be sent') 83 parser.add_argument('--recvif', nargs=1, 84 required=True, 85 help='The interface on which to check for the packet') 86 parser.add_argument('--src', nargs=1, 87 required=True, 88 help='The source IP address') 89 parser.add_argument('--to', nargs=1, 90 required=True, 91 help='The destination IP address') 92 parser.add_argument('--debug', 93 required=False, action='store_true', 94 help='Enable test debugging') 95 96 args = parser.parse_args() 97 98 99 # Start sniffing on recvif 100 sniffer = Sniffer(args, check_icmp6_error) 101 sniffer2 = Sniffer(args, check_icmp6_error_2) 102 103 104 ######################################################################## 105 # 106 # Two fragments with payload and offset set to add up to >64k. 107 # 108 # Make a first fragment arrive and a second to explode everything. 109 # 110 # A: Reassembly failure. 111 # R: ICMPv6 param prob, param header. 112 # R: ICMPv6 timeout (1st frag, off=0) 113 # 114 data = "6" * 1280 115 ip6f01 = \ 116 sp.Ether() / \ 117 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 118 sp.IPv6ExtHdrFragment(offset=0, m=1, id=7) / \ 119 sp.UDP(dport=3456, sport=6543) / \ 120 data 121 ip6f02 = \ 122 sp.Ether() / \ 123 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 124 sp.IPv6ExtHdrFragment(offset=0x1fff, m=1, id=7) / \ 125 sp.UDP(dport=3456, sport=6543) / \ 126 data 127 if args.debug : 128 ip6f01.display() 129 ip6f02.display() 130 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 131 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 132 133 sleep(1.00) 134 sniffer.setEnd() 135 sniffer.join() 136 if not sniffer.foundCorrectPacket: 137 sys.exit(1) 138 139 140 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## 141 # 142 # A fragment with payload and offset set to add up to >64k. 143 # 144 # Try again with the first packet to make things explode. 145 # 146 # A: Reassembly failure. 147 # R: ICMPv6 param prob, param header. 148 # 149 150 # Start sniffing on recvif 151 sniffer = Sniffer(args, check_icmp6_error) 152 153 ip6f01 = \ 154 sp.Ether() / \ 155 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 156 sp.IPv6ExtHdrFragment(offset=0x1fff, m=1, id=0x7001) / \ 157 sp.UDP(dport=3456, sport=6543) / \ 158 data 159 if args.debug : 160 ip6f01.display() 161 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 162 163 sleep(0.10) 164 sniffer.setEnd() 165 sniffer.join() 166 if not sniffer.foundCorrectPacket: 167 sys.exit(1) 168 169 # Wait for expiry from first test run. 170 sleep(3) 171 sniffer2.setEnd() 172 sniffer2.join() 173 if not sniffer2.foundCorrectPacket: 174 sys.exit(1) 175 176 sys.exit(0) 177 178if __name__ == '__main__': 179 main() 180