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pf tests: more thorough pfsync defer test

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Add a somewhat more extensive pfsync defer mode test. Ensure that pfsync
actually delays the state creating packet until after it has sent the
pfsync update and given the peer time to create the state.

Ideally the test should validate the pfsync state update and generate an
ack message, but to keep the test simple we rely on the timeout of the
deferred packet instead.

MFC after:	1 week
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D33245
This commit is contained in:
Kristof Provost 2021-12-02 18:47:40 +01:00
parent 73fd0eaf59
commit 60a3a371af
3 changed files with 203 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tests/sys/netpfil/pf/Makefile
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@ -40,6 +40,7 @@ ${PACKAGE}FILES+= CVE-2019-5597.py \
frag-overindex.py \
frag-overlimit.py \
frag-overreplace.py \
pfsync_defer.py \
utils.subr
${PACKAGE}FILESMODE_CVE-2019-5597.py= 0555
@ -48,5 +49,6 @@ ${PACKAGE}FILESMODE_fragcommon.py= 0555
${PACKAGE}FILESMODE_frag-overindex.py= 0555
${PACKAGE}FILESMODE_frag-overlimit.py= 0555
${PACKAGE}FILESMODE_frag-overreplace.py= 0555
${PACKAGE}FILESMODE_pfsync_defer.py= 0555
.include <bsd.test.mk>

71
tests/sys/netpfil/pf/pfsync.sh
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@ -27,6 +27,8 @@
. $(atf_get_srcdir)/utils.subr
common_dir=$(atf_get_srcdir)/../common
atf_test_case "basic" "cleanup"
basic_head()
{
@ -95,6 +97,23 @@ basic_cleanup()
pfsynct_cleanup
}
atf_test_case "basic_defer" "cleanup"
basic_defer_head()
{
atf_set descr 'Basic defer mode pfsync test'
atf_set require.user root
}
basic_defer_body()
{
common_body defer
}
basic_defer_cleanup()
{
pfsynct_cleanup
}
atf_test_case "defer" "cleanup"
defer_head()
{
@ -104,7 +123,56 @@ defer_head()
defer_body()
{
common_body defer
pfsynct_init
epair_sync=$(vnet_mkepair)
epair_in=$(vnet_mkepair)
epair_out=$(vnet_mkepair)
vnet_mkjail alcatraz ${epair_sync}a ${epair_in}a ${epair_out}a
jexec alcatraz ifconfig ${epair_sync}a 192.0.2.1/24 up
jexec alcatraz ifconfig ${epair_out}a 198.51.100.1/24 up
jexec alcatraz ifconfig ${epair_in}a 203.0.113.1/24 up
jexec alcatraz arp -s 203.0.113.2 00:01:02:03:04:05
jexec alcatraz sysctl net.inet.ip.forwarding=1
jexec alcatraz ifconfig pfsync0 \
syncdev ${epair_sync}a \
maxupd 1 \
defer \
up
ifconfig ${epair_sync}b 192.0.2.2/24 up
ifconfig ${epair_out}b 198.51.100.2/24 up
ifconfig ${epair_in}b up
route add -net 203.0.113.0/24 198.51.100.1
# Enable pf
jexec alcatraz pfctl -e
pft_set_rules alcatraz \
"set skip on ${epair_sync}a" \
"pass keep state"
atf_check -s exit:0 env PYTHONPATH=${common_dir} \
$(atf_get_srcdir)/pfsync_defer.py \
--syncdev ${epair_sync}b \
--indev ${epair_in}b \
--outdev ${epair_out}b
# Now disable defer mode and expect failure.
jexec alcatraz ifconfig pfsync0 -defer
# Flush state
pft_set_rules alcatraz \
"set skip on ${epair_sync}a" \
"pass keep state"
atf_check -s exit:1 env PYTHONPATH=${common_dir} \
$(atf_get_srcdir)/pfsync_defer.py \
--syncdev ${epair_sync}b \
--indev ${epair_in}b \
--outdev ${epair_out}b
}
defer_cleanup()
@ -182,6 +250,7 @@ bulk_cleanup()
atf_init_test_cases()
{
atf_add_test_case "basic"
atf_add_test_case "basic_defer"
atf_add_test_case "defer"
atf_add_test_case "bulk"
}

131
tests/sys/netpfil/pf/pfsync_defer.py Normal file
View File

@ -0,0 +1,131 @@
#!/usr/bin/env python3
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2021 Rubicon Communications, LLC (Netgate)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
import argparse
import logging
logging.getLogger("scapy").setLevel(logging.CRITICAL)
import scapy.all as sp
import socket
import sys
import time
from sniffer import Sniffer
got_pfsync = False
got_ping = False
sent_ping = False
def check_pfsync(args, packet):
global got_pfsync
global got_ping
ip = packet.getlayer(sp.IP)
if not ip:
return False
if ip.proto != 240:
return False
# Only look at the first packet
if got_pfsync:
return False
got_pfsync = time.time()
return False
def check_reply(args, packet):
global got_pfsync
global got_ping
if not packet.getlayer(sp.ICMP):
return False
# Only look at the first packet
if got_ping:
return False
got_ping = time.time()
return False
def ping(intf):
global sent_ping
ether = sp.Ether()
ip = sp.IP(dst="203.0.113.2", src="198.51.100.2")
icmp = sp.ICMP(type='echo-request')
raw = sp.raw(bytes.fromhex('00010203'))
req = ether / ip / icmp / raw
sp.sendp(req, iface=intf, verbose=False)
sent_ping = time.time()
def main():
global got_pfsync
global got_ping
global sent_ping
parser = argparse.ArgumentParser("pfsync_defer.py",
description="pfsync defer mode test")
parser.add_argument('--syncdev', nargs=1,
required=True,
help='The pfsync interface')
parser.add_argument('--outdev', nargs=1,
required=True,
help='The interface we will send packets on')
parser.add_argument('--indev', nargs=1,
required=True,
help='The interface we will receive packets on')
args = parser.parse_args()
syncmon = Sniffer(args, check_pfsync, args.syncdev[0])
datamon = Sniffer(args, check_reply, args.indev[0])
# Send traffic on datadev, which should create state and produce a pfsync message
ping(args.outdev[0])
syncmon.join()
datamon.join()
if not got_pfsync:
sys.exit(1)
if not got_ping:
sys.exit(1)
if got_pfsync > got_ping:
sys.exit(1)
# Deferred packets are delayed up to 20ms (unless the pfsync peer, which we
# don't have here, acks their state update earlier)
if (sent_ping + 0.020) > got_ping:
sys.exit(1)
if __name__ == '__main__':
main()