# $FreeBSD$
#
# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
#
# Copyright (c) 2017 Kristof Provost <kp@FreeBSD.org>
#
# 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.

. $(atf_get_srcdir)/utils.subr

atf_test_case "too_many_fragments" "cleanup"

too_many_fragments_head()
{
	atf_set descr 'IPv4 fragment limitation test'
	atf_set require.user root
}

too_many_fragments_body()
{
	pft_init

	epair=$(vnet_mkepair)
	vnet_mkjail alcatraz ${epair}a

	ifconfig ${epair}b inet 192.0.2.1/24 up
	jexec alcatraz ifconfig ${epair}a 192.0.2.2/24 up

	ifconfig ${epair}b mtu 200
	jexec alcatraz ifconfig ${epair}a mtu 200

	jexec alcatraz pfctl -e
	pft_set_rules alcatraz \
		"scrub all fragment reassemble"

	# So we know pf is limiting things
	jexec alcatraz sysctl net.inet.ip.maxfragsperpacket=1024

	# Sanity check
	atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2

	# We can ping with < 64 fragments
	atf_check -s exit:0 -o ignore ping -c 1 -s 800 192.0.2.2

	# Too many fragments should fail
	atf_check -s exit:2 -o ignore ping -c 1 -s 20000 192.0.2.2
}

too_many_fragments_cleanup()
{
	pft_cleanup
}

atf_test_case "v6" "cleanup"
v6_head()
{
	atf_set descr 'IPv6 fragmentation test'
	atf_set require.user root
	atf_set require.progs scapy
}

v6_body()
{
	pft_init

	epair_send=$(vnet_mkepair)
	epair_link=$(vnet_mkepair)

	vnet_mkjail alcatraz ${epair_send}b ${epair_link}a
	vnet_mkjail singsing ${epair_link}b

	ifconfig ${epair_send}a inet6 2001:db8:42::1/64 no_dad up

	jexec alcatraz ifconfig ${epair_send}b inet6 2001:db8:42::2/64 no_dad up
	jexec alcatraz ifconfig ${epair_link}a inet6 2001:db8:43::2/64 no_dad up
	jexec alcatraz sysctl net.inet6.ip6.forwarding=1

	jexec singsing ifconfig ${epair_link}b inet6 2001:db8:43::3/64 no_dad up
	jexec singsing route add -6 2001:db8:42::/64 2001:db8:43::2
	route add -6 2001:db8:43::/64 2001:db8:42::2

	jexec alcatraz ifconfig ${epair_send}b inet6 -ifdisabled
	jexec alcatraz ifconfig ${epair_link}a inet6 -ifdisabled
	jexec singsing ifconfig ${epair_link}b inet6 -ifdisabled
	ifconfig ${epair_send}a inet6 -ifdisabled

	jexec alcatraz pfctl -e
	pft_set_rules alcatraz \
		"scrub fragment reassemble" \
		"block in" \
		"pass in inet6 proto icmp6 icmp6-type { neighbrsol, neighbradv }" \
		"pass in inet6 proto icmp6 icmp6-type { echoreq, echorep }"

	# Host test
	atf_check -s exit:0 -o ignore \
		ping -6 -c 1 2001:db8:42::2

	atf_check -s exit:0 -o ignore \
		ping -6 -c 1 -s 4500 2001:db8:42::2

	atf_check -s exit:0 -o ignore\
		ping -6 -c 1 -b 70000 -s 65000 2001:db8:42::2

	# Forwarding test
	atf_check -s exit:0 -o ignore \
		ping -6 -c 1 2001:db8:43::3

	atf_check -s exit:0 -o ignore \
		ping -6 -c 1 -s 4500 2001:db8:43::3

	atf_check -s exit:0 -o ignore\
		ping -6 -c 1 -b 70000 -s 65000 2001:db8:43::3

	$(atf_get_srcdir)/CVE-2019-5597.py \
		${epair_send}a \
		2001:db8:42::1 \
		2001:db8:43::3
}

v6_cleanup()
{
	pft_cleanup
}

atf_init_test_cases()
{
	atf_add_test_case "too_many_fragments"
	atf_add_test_case "v6"
}