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