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e27970ae8f
If during ip_forward() we find a blackhole (or reject) route we should stop
processing and count this in the 'cantforward' counter, just like we already do
for IPv6.
Blackhole routes are set to use the loopback interface, so we don't actually
incorrectly forward traffic, but we do fail to count it as unroutable.
Test this, both for IPv4 and IPv6.
Reviewed by: melifaro
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D47529
325 lines
8.7 KiB
Bash
Executable file
325 lines
8.7 KiB
Bash
Executable file
#!/usr/bin/env atf-sh
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#-
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# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (c) 2020 Alexander V. Chernikov
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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#
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. $(atf_get_srcdir)/../common/vnet.subr
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atf_test_case "fwd_ip_icmp_iface_fast_success" "cleanup"
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fwd_ip_icmp_iface_fast_success_head() {
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atf_set descr 'Test valid IPv4 on-stick fastforwarding to iface'
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atf_set require.user root
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atf_set require.progs scapy
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}
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fwd_ip_icmp_iface_fast_success_body() {
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vnet_init
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ip4a="192.0.2.1"
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ip4b="192.0.2.2"
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plen=29
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src_ip="192.0.2.3"
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script_name="../common/sender.py"
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epair=$(vnet_mkepair)
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ifconfig ${epair}a up
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ifconfig ${epair}a inet ${ip4a}/${plen}
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jname="v4t-fwd_ip_icmp_iface_fast_success"
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vnet_mkjail ${jname} ${epair}b
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jexec ${jname} ifconfig ${epair}b up
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jexec ${jname} ifconfig ${epair}b inet ${ip4b}/${plen}
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# Get router ip/mac
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jail_ip=${ip4b}
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jail_mac=`jexec ${jname} ifconfig ${epair}b ether | awk '$1~/ether/{print$2}'`
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our_mac=`ifconfig ${epair}a ether | awk '$1~/ether/{print$2}'`
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jexec ${jname} sysctl net.inet.ip.forwarding=1
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# As we're doing router-on-the-stick, turn sending IP redirects off:
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jexec ${jname} sysctl net.inet.ip.redirect=0
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# echo "LOCAL: ${local_ip} ${local_mac}"
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# echo "REMOTE: ${remote_rtr_ip} ${remote_rtr_mac}"
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atf_check -s exit:0 $(atf_get_srcdir)/${script_name} \
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--test_name fwd_ip_icmp_fast \
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--smac ${our_mac} --dmac ${jail_mac} \
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--sip ${src_ip} --dip ${ip4a} \
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--iface ${epair}a
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# check counters are valid
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atf_check -o match:'1 packet forwarded \(1 packet fast forwarded\)' jexec ${jname} netstat -sp ip
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}
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fwd_ip_icmp_iface_fast_success_cleanup() {
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vnet_cleanup
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}
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atf_test_case "fwd_ip_icmp_gw_fast_success" "cleanup"
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fwd_ip_icmp_gw_fast_success_head() {
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atf_set descr 'Test valid IPv4 on-stick fastforwarding to gw'
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atf_set require.user root
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atf_set require.progs scapy
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}
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fwd_ip_icmp_gw_fast_success_body() {
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vnet_init
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ip4a="192.0.2.1"
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ip4b="192.0.2.2"
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plen=29
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src_ip="192.0.2.3"
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dst_ip="192.0.2.4"
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script_name="../common/sender.py"
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epair=$(vnet_mkepair)
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ifconfig ${epair}a up
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ifconfig ${epair}a inet ${ip4a}/${plen}
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jname="v4t-fwd_ip_icmp_gw_fast_success"
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vnet_mkjail ${jname} ${epair}b
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jexec ${jname} ifconfig ${epair}b up
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jexec ${jname} ifconfig ${epair}b inet ${ip4b}/${plen}
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# Get router ip/mac
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jail_ip=${ip4b}
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jail_mac=`jexec ${jname} ifconfig ${epair}b ether | awk '$1~/ether/{print$2}'`
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our_mac=`ifconfig ${epair}a ether | awk '$1~/ether/{print$2}'`
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jexec ${jname} sysctl net.inet.ip.forwarding=1
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# As we're doing router-on-the-stick, turn sending IP redirects off:
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jexec ${jname} sysctl net.inet.ip.redirect=0
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# Add host route
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jexec ${jname} route -4 add -host ${dst_ip} ${ip4a}
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# echo "LOCAL: ${local_ip} ${local_mac}"
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# echo "REMOTE: ${remote_rtr_ip} ${remote_rtr_mac}"
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atf_check -s exit:0 $(atf_get_srcdir)/${script_name} \
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--test_name fwd_ip_icmp_fast \
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--smac ${our_mac} --dmac ${jail_mac} \
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--sip ${src_ip} --dip ${dst_ip} \
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--iface ${epair}a
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# check counters are valid
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atf_check -o match:'1 packet forwarded \(1 packet fast forwarded\)' jexec ${jname} netstat -sp ip
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}
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fwd_ip_icmp_gw_fast_success_cleanup() {
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vnet_cleanup
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}
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atf_test_case "fwd_ip_icmp_iface_slow_success" "cleanup"
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fwd_ip_icmp_iface_slow_success_head() {
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atf_set descr 'Test valid IPv4 on-stick "slow" forwarding to iface'
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atf_set require.user root
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atf_set require.progs scapy
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}
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fwd_ip_icmp_iface_slow_success_body() {
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vnet_init
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ip4a="192.0.2.1"
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ip4b="192.0.2.2"
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plen=29
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src_ip="192.0.2.3"
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script_name="../common/sender.py"
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epair=$(vnet_mkepair)
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ifconfig ${epair}a up
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ifconfig ${epair}a inet ${ip4a}/${plen}
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jname="v4t-fwd_ip_icmp_iface_slow_success"
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vnet_mkjail ${jname} ${epair}b
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jexec ${jname} ifconfig ${epair}b up
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jexec ${jname} ifconfig ${epair}b inet ${ip4b}/${plen}
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# Get router ip/mac
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jail_ip=${ip4b}
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jail_mac=`jexec ${jname} ifconfig ${epair}b ether | awk '$1~/ether/{print$2}'`
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our_mac=`ifconfig ${epair}a ether | awk '$1~/ether/{print$2}'`
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jexec ${jname} sysctl net.inet.ip.forwarding=1
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# As we're doing router-on-the-stick, turn sending IP redirects off:
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jexec ${jname} sysctl net.inet.ip.redirect=0
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# Generate packet with options to force slow-path
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atf_check -s exit:0 $(atf_get_srcdir)/${script_name} \
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--test_name fwd_ip_icmp_slow \
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--smac ${our_mac} --dmac ${jail_mac} \
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--sip ${src_ip} --dip ${ip4a} \
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--iface ${epair}a
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# check counters are valid
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atf_check -o match:'1 packet forwarded \(0 packets fast forwarded\)' jexec ${jname} netstat -sp ip
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}
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fwd_ip_icmp_iface_slow_success_cleanup() {
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vnet_cleanup
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}
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atf_test_case "fwd_ip_icmp_gw_slow_success" "cleanup"
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fwd_ip_icmp_gw_slow_success_head() {
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atf_set descr 'Test valid IPv4 on-stick "slow" forwarding to gw'
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atf_set require.user root
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atf_set require.progs scapy
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}
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fwd_ip_icmp_gw_slow_success_body() {
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vnet_init
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ip4a="192.0.2.1"
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ip4b="192.0.2.2"
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plen=29
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src_ip="192.0.2.3"
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dst_ip="192.0.2.4"
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script_name="../common/sender.py"
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epair=$(vnet_mkepair)
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ifconfig ${epair}a up
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ifconfig ${epair}a inet ${ip4a}/${plen}
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jname="v4t-fwd_ip_icmp_gw_slow_success"
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vnet_mkjail ${jname} ${epair}b
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jexec ${jname} ifconfig ${epair}b up
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jexec ${jname} ifconfig ${epair}b inet ${ip4b}/${plen}
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# Get router ip/mac
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jail_ip=${ip4b}
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jail_mac=`jexec ${jname} ifconfig ${epair}b ether | awk '$1~/ether/{print$2}'`
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our_mac=`ifconfig ${epair}a ether | awk '$1~/ether/{print$2}'`
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jexec ${jname} sysctl net.inet.ip.forwarding=1
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# As we're doing router-on-the-stick, turn sending IP redirects off:
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jexec ${jname} sysctl net.inet.ip.redirect=0
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# Add host route
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jexec ${jname} route -4 add -host ${dst_ip} ${ip4a}
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# echo "LOCAL: ${local_ip} ${local_mac}"
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# echo "REMOTE: ${remote_rtr_ip} ${remote_rtr_mac}"
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atf_check -s exit:0 $(atf_get_srcdir)/${script_name} \
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--test_name fwd_ip_icmp_fast \
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--smac ${our_mac} --dmac ${jail_mac} \
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--sip ${src_ip} --dip ${dst_ip} \
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--iface ${epair}a
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# check counters are valid
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atf_check -o match:'1 packet forwarded \(1 packet fast forwarded\)' jexec ${jname} netstat -sp ip
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}
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fwd_ip_icmp_gw_slow_success_cleanup() {
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vnet_cleanup
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}
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atf_test_case "fwd_ip_blackhole" "cleanup"
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fwd_ip_blackhole_head() {
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atf_set descr 'Test blackhole routes'
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atf_set require.user root
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}
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fwd_ip_blackhole_body() {
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jname="v4t-fwd_ip_blackhole"
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vnet_init
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epair=$(vnet_mkepair)
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epair_out=$(vnet_mkepair)
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ifconfig ${epair}a 192.0.2.2/24 up
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vnet_mkjail ${jname} ${epair}b ${epair_out}b
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jexec ${jname} ifconfig lo0 127.0.0.1/8 up
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jexec ${jname} ifconfig ${epair}b 192.0.2.1/24 up
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jexec ${jname} ifconfig ${epair_out}b 198.51.100.1/24 up
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jexec ${jname} sysctl net.inet.ip.forwarding=1
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route add default 192.0.2.1
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atf_check -s exit:2 -o ignore \
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ping -c 1 -t 1 198.51.100.2
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atf_check -s exit:0 -o match:"0 packets not forwardable" \
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jexec ${jname} netstat -s -p ip
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# Create blackhole route
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jexec ${jname} /sbin/route add 198.51.100.2 -blackhole -fib 0
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jexec ${jname} netstat -rn
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# Include an IP option to ensure slow path
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atf_check -s exit:2 -o ignore \
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ping -c 1 -t 1 -R 198.51.100.2
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atf_check -s exit:0 -o match:"1 packet not forwardable" \
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jexec ${jname} netstat -s -p ip
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# Now try via the fast path
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atf_check -s exit:2 -o ignore \
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ping -c 1 -t 1 198.51.100.2
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atf_check -s exit:0 -o match:"2 packets not forwardable" \
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jexec ${jname} netstat -s -p ip
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}
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fwd_ip_blackhole_cleanup() {
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vnet_cleanup
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}
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atf_init_test_cases()
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{
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atf_add_test_case "fwd_ip_icmp_iface_fast_success"
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atf_add_test_case "fwd_ip_icmp_gw_fast_success"
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atf_add_test_case "fwd_ip_icmp_iface_slow_success"
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atf_add_test_case "fwd_ip_icmp_gw_slow_success"
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atf_add_test_case "fwd_ip_blackhole"
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}
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# end
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