1# 2# SPDX-License-Identifier: BSD-2-Clause 3# 4# Copyright (c) 2024 Rubicon Communications, LLC (Netgate) 5# 6# Redistribution and use in source and binary forms, with or without 7# modification, are permitted provided that the following conditions 8# are met: 9# 1. Redistributions of source code must retain the above copyright 10# notice, this list of conditions and the following disclaimer. 11# 2. Redistributions in binary form must reproduce the above copyright 12# notice, this list of conditions and the following disclaimer in the 13# documentation and/or other materials provided with the distribution. 14# 15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25# SUCH DAMAGE. 26 27import pytest 28import subprocess 29import re 30from atf_python.sys.net.tools import ToolsHelper 31from atf_python.sys.net.vnet import VnetTestTemplate 32 33def check(cmd): 34 ps = subprocess.Popen(cmd, shell=True) 35 ret = ps.wait() 36 if ret != 0: 37 raise Exception("Command %s returned %d" % (cmd, ret)) 38 39class TestICMP(VnetTestTemplate): 40 REQUIRED_MODULES = [ "pf" ] 41 TOPOLOGY = { 42 "vnet1": {"ifaces": ["if1"]}, 43 "vnet2": {"ifaces": ["if1", "if2"]}, 44 "vnet3": {"ifaces": ["if2"]}, 45 "if1": {"prefixes4": [("192.0.2.2/24", "192.0.2.1/24")]}, 46 "if2": {"prefixes4": [("198.51.100.1/24", "198.51.100.2/24")]}, 47 } 48 49 def vnet2_handler(self, vnet): 50 ifname = vnet.iface_alias_map["if1"].name 51 52 ToolsHelper.print_output("/sbin/pfctl -e") 53 ToolsHelper.pf_rules([ 54 "set reassemble yes", 55 "block", 56 "pass inet proto icmp icmp-type echoreq", 57 ]) 58 59 ToolsHelper.print_output("/sbin/sysctl net.inet.ip.forwarding=1") 60 ToolsHelper.print_output("/sbin/pfctl -x loud") 61 62 def vnet3_handler(self, vnet): 63 # Import in the correct vnet, so at to not confuse Scapy 64 import scapy.all as sp 65 66 ifname = vnet.iface_alias_map["if2"].name 67 ToolsHelper.print_output("/sbin/route add default 198.51.100.1") 68 ToolsHelper.print_output("/sbin/ifconfig %s inet alias 198.51.100.3/24" % ifname) 69 70 def checkfn(packet): 71 icmp = packet.getlayer(sp.ICMP) 72 if not icmp: 73 return False 74 75 if icmp.type != 3: 76 return False 77 78 packet.show() 79 return True 80 81 sp.sniff(iface=ifname, stop_filter=checkfn) 82 vnet.pipe.send("Got ICMP destination unreachable packet") 83 84 @pytest.mark.require_user("root") 85 def test_inner_match(self): 86 vnet = self.vnet_map["vnet1"] 87 dst_vnet = self.vnet_map["vnet3"] 88 sendif = vnet.iface_alias_map["if1"].name 89 90 our_mac = ToolsHelper.get_output("/sbin/ifconfig %s ether | awk '/ether/ { print $2; }'" % sendif) 91 dst_mac = re.sub("0a$", "0b", our_mac) 92 93 # Import in the correct vnet, so at to not confuse Scapy 94 import scapy.all as sp 95 96 ToolsHelper.print_output("/sbin/route add default 192.0.2.1") 97 98 # Sanity check 99 check("/sbin/ping -c 1 192.0.2.1") 100 check("/sbin/ping -c 1 198.51.100.1") 101 check("/sbin/ping -c 2 198.51.100.3") 102 103 # Establish a state 104 pkt = sp.Ether(src=our_mac, dst=dst_mac) \ 105 / sp.IP(src="192.0.2.2", dst="198.51.100.2") \ 106 / sp.ICMP(type='echo-request') \ 107 / "PAYLOAD" 108 sp.sendp(pkt, sendif, verbose=False) 109 110 # Now try to pass an ICMP error message piggy-backing on that state, but 111 # use a different source address 112 pkt = sp.Ether(src=our_mac, dst=dst_mac) \ 113 / sp.IP(src="192.0.2.2", dst="198.51.100.3") \ 114 / sp.ICMP(type='dest-unreach') \ 115 / sp.IP(src="198.51.100.2", dst="192.0.2.2") \ 116 / sp.ICMP(type='echo-reply') 117 sp.sendp(pkt, sendif, verbose=False) 118 119 try: 120 rcvd = self.wait_object(dst_vnet.pipe, timeout=1) 121 if rcvd: 122 raise Exception(rcvd) 123 except TimeoutError as e: 124 # We expect the timeout here. It means we didn't get the destination 125 # unreachable packet in vnet3 126 pass 127