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 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 # A fragment with payload and offset set to add up to >64k when 108 # another frag with offset=0 arrives and has an unfrag part. 109 # This is us checking for all fragments queued already when the 110 # one with off=0 arrives. Note: unless the off=0 has its own problem 111 # it will be queued and off!=0 ones might be expunged with param prob. 112 # 113 # A: Reassembly failure, timeout after 114 # R: ICMPv6 param prob, param header (1st frag) 115 # R: ICMPv6 time exceeded (2nd frag, as off=0) 116 # 117 data = "6" * 15 118 ip6f01 = \ 119 sp.Ether() / \ 120 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 121 sp.IPv6ExtHdrFragment(offset=0x1ffc, m=0, id=8) / \ 122 sp.UDP(dport=3456, sport=6543) / \ 123 data 124 data = "6" * 8 125 ip6f02 = \ 126 sp.Ether() / \ 127 sp.IPv6(src=args.src[0], dst=args.to[0]) / \ 128 sp.IPv6ExtHdrDestOpt(options = \ 129 sp.PadN(optdata="\x00\x00\x00\x00\x00\x00")) / \ 130 sp.IPv6ExtHdrFragment(offset=0, m=1, id=8) / \ 131 sp.UDP(dport=3456, sport=6543) / \ 132 data 133 if args.debug : 134 ip6f01.display() 135 ip6f02.display() 136 sp.sendp(ip6f01, iface=args.sendif[0], verbose=False) 137 sp.sendp(ip6f02, iface=args.sendif[0], verbose=False) 138 139 sleep(1.00) 140 sniffer.setEnd() 141 sniffer.join() 142 if not sniffer.foundCorrectPacket: 143 sys.exit(1) 144 sleep(3) 145 sniffer2.setEnd() 146 sniffer2.join() 147 if not sniffer2.foundCorrectPacket: 148 sys.exit(1) 149 150 sys.exit(0) 151 152if __name__ == '__main__': 153 main() 154