t_mtudisc.sh revision 1.4 
1#	$NetBSD: t_mtudisc.sh,v 1.4 2016/11/24 08:52:20 ozaki-r Exp $
2#
3# Copyright (c) 2016 Internet Initiative Japan Inc.
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14#
15# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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27
28inetserver="rump_server -lrumpnet -lrumpnet_net -lrumpnet_netinet"
29inetserver="$inetserver -lrumpnet_netinet6 -lrumpnet_shmif"
30inetserver="$inetserver -lrumpdev"
31HIJACKING="env LD_PRELOAD=/usr/lib/librumphijack.so RUMPHIJACK=sysctl=yes"
32
33SOCKLOCAL=unix://commsock1
34SOCKGATEWAY=unix://commsock2
35SOCKREMOTE=unix://commsock3
36HTTPD_PID=httpd.pid
37HTML_FILE=index.html
38
39DEBUG=${DEBUG:-false}
40
41atf_test_case mtudisc_basic cleanup
42
43mtudisc_basic_head()
44{
45	atf_set "descr" "Tests for IPv4 Path MTU Dicorvery basic behavior"
46	atf_set "require.progs" "rump_server"
47}
48
49setup_server()
50{
51	local sock=$1
52	local if=$2
53	local bus=$3
54	local ip=$4
55
56	export RUMP_SERVER=$sock
57
58	atf_check -s exit:0 rump.ifconfig $if create
59	atf_check -s exit:0 rump.ifconfig $if linkstr $bus
60	atf_check -s exit:0 rump.ifconfig $if $ip
61	atf_check -s exit:0 rump.ifconfig $if up
62	atf_check -s exit:0 rump.ifconfig -w 10
63
64	$DEBUG && rump.ifconfig $if
65}
66
67setup_httpd()
68{
69	local sock=$1
70	local ip=$2
71	local data="0123456789"
72
73	export RUMP_SERVER=$sock
74
75	touch $HTML_FILE
76	for i in `seq 1 512`
77	do
78		echo $data >> $HTML_FILE
79	done
80
81	# start httpd in daemon mode
82	atf_check -s exit:0 env LD_PRELOAD=/usr/lib/librumphijack.so \
83	    /usr/libexec/httpd -P $HTTPD_PID -i $ip -b -s $(pwd)
84
85	$DEBUG && rump.netstat -a
86
87	sleep 5
88}
89
90do_http_get()
91{
92	local ip=$1
93	local ret=$2
94	local timeout=5
95
96	# get the webpage
97	atf_check -s exit:$ret env LD_PRELOAD=/usr/lib/librumphijack.so	\
98	    ftp -q $timeout -o ./out http://$ip/$HTML_FILE
99}
100
101mtudisc_basic_body()
102{
103	local pkt=
104	local local_ip=10.0.0.2
105	local gateway_local_ip=10.0.0.1
106	local gateway_remote_ip=10.0.1.1
107	local remote_ip=10.0.1.2
108	local prefixlen=24
109
110	atf_check -s exit:0 ${inetserver} $SOCKLOCAL
111	atf_check -s exit:0 ${inetserver} $SOCKGATEWAY
112	atf_check -s exit:0 ${inetserver} $SOCKREMOTE
113
114	#
115	# Setup servers
116	#
117	# [local server]                 [gateway server]          [remote server with httpd]
118	#       | 10.0.0.2        10.0.0.1 |          | 10.0.1.1       10.0.1.2 |
119	# shmif0(mtu=1500) ----- shmif1(mtu=1280)   shmif0(mtu=1500) ----- shmif0(mtu=1500)
120	#
121
122	# Assign IP addresses
123	setup_server $SOCKLOCAL shmif0 bus1 $local_ip/$prefixlen
124	setup_server $SOCKGATEWAY shmif0 bus1 $gateway_local_ip/$prefixlen
125	setup_server $SOCKGATEWAY shmif1 bus2 $gateway_remote_ip/$prefixlen
126	setup_server $SOCKREMOTE shmif0 bus2 $remote_ip/$prefixlen
127
128	### Setup gateway server
129	export RUMP_SERVER=$SOCKGATEWAY
130
131	# Set mtu of shmif0 to 1280
132	export RUMP_SERVER=$SOCKGATEWAY
133	atf_check -s exit:0 rump.ifconfig shmif0 mtu 1280
134
135	# Enable IPv4 forwarding
136	atf_check -s exit:0 rump.sysctl -w -q net.inet.ip.forwarding=1
137
138	### Setup remote server
139	export RUMP_SERVER=$SOCKREMOTE
140
141	# Check default value
142	atf_check -s exit:0 -o match:"1" rump.sysctl -n net.inet.ip.mtudisc
143
144	# Start httpd daemon
145	setup_httpd $SOCKREMOTE $remote_ip
146
147	# Teach the peer thar 10.0.0.2(local serer) is behind 10.0.1.1(gateway server)
148	atf_check -s exit:0 -o ignore rump.route add $local_ip/32 $gateway_remote_ip
149
150	### Setup local server
151	export RUMP_SERVER=$SOCKLOCAL
152
153	# Teach the peer thar 10.0.1.2(remote serer) is behind 10.0.0.1(gateway server)
154	atf_check -s exit:0 -o ignore rump.route add $remote_ip/32 $gateway_local_ip
155
156	# Don't accept fragmented packets
157	atf_check -s exit:0 -o ignore rump.sysctl -w -q net.inet.ip.maxfragpackets=0
158
159	#
160	# Test disabled path mtu discorvery
161	#
162	export RUMP_SERVER=$SOCKREMOTE
163	atf_check -s exit:0 -o ignore rump.sysctl -w -q net.inet.ip.mtudisc=0
164
165	# Get the webpage (expect: failed)
166	export RUMP_SERVER=$SOCKLOCAL
167	do_http_get $remote_ip 1
168	$DEBUG && extract_new_packets bus2 > ./out
169	$DEBUG && cat ./out
170
171	# Check path mtu size on remote server
172	export RUMP_SERVER=$SOCKREMOTE
173	atf_check -s exit:0 \
174		-o match:"^10.0.0.2 +10.0.1.1 +UGHS +- +- +- +shmif0" \
175		rump.netstat -nr -f inet
176
177	#
178	# Test enabled path mtu discorvery
179	#
180	export RUMP_SERVER=$SOCKREMOTE
181	atf_check -s exit:0 -o ignore rump.sysctl -w -q net.inet.ip.mtudisc=1
182
183	# Get the webpage (expect: success)
184	export RUMP_SERVER=$SOCKLOCAL
185	do_http_get $remote_ip 0
186	$DEBUG && extract_new_packets bus2 > ./out
187	$DEBUG && cat ./out
188
189	# Check path mtu size on remote server
190	export RUMP_SERVER=$SOCKREMOTE
191	atf_check -s exit:0 \
192		-o match:"^10.0.0.2 +10.0.1.1 +UGHS +- +- +1280 +shmif0" \
193		rump.netstat -nr -f inet
194
195}
196
197cleanup()
198{
199	gdb -ex bt /usr/bin/rump_server rump_server.core
200	gdb -ex bt /usr/sbin/arp arp.core
201	env RUMP_SERVER=$SOCKLOCAL rump.halt
202	env RUMP_SERVER=$SOCKGATEWAY rump.halt
203	env RUMP_SERVER=$SOCKREMOTE rump.halt
204}
205
206dump_server()
207{
208	local sock=$1
209	export RUMP_SERVER=$sock
210	rump.netstat -nr
211	rump.arp -n -a
212	rump.ifconfig
213	$HIJACKING dmesg
214}
215
216dump()
217{
218	dump_server $SOCKLOCAL
219	dump_server $SOCKGATEWAY
220	dump_server $SOCKREMOTE
221	shmif_dumpbus -p - bus1 2>/dev/null| tcpdump -n -e -r -
222	shmif_dumpbus -p - bus2 2>/dev/null| tcpdump -n -e -r -
223}
224
225mtudisc_basic_cleanup()
226{
227	$DEBUG && dump
228	kill "$(cat ${HTTPD_PID})"
229	env RUMP_SERVER=$SOCKLOCAL rump.halt
230	env RUMP_SERVER=$SOCKGATEWAY rump.halt
231	env RUMP_SERVER=$SOCKREMOTE rump.halt
232}
233
234atf_init_test_cases()
235{
236	atf_add_test_case mtudisc_basic
237}
238