#	$NetBSD: t_mtudisc6.sh,v 1.5 2016/11/25 08:51:17 ozaki-r Exp $
#
# Copyright (c) 2016 Internet Initiative Japan Inc.
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SOCKLOCAL=unix://commsock1
SOCKGATEWAY=unix://commsock2
SOCKREMOTE=unix://commsock3
HTML_FILE=index.html

DEBUG=${DEBUG:-false}

atf_test_case mtudisc6_basic cleanup

mtudisc6_basic_head()
{

	atf_set "descr" "Tests for IPv6 Path MTU Dicorvery basic behavior"
	atf_set "require.progs" "rump_server"
}

setup_server()
{
	local sock=$1
	local if=$2
	local bus=$3
	local ip=$4

	rump_server_add_iface $sock $if $bus

	export RUMP_SERVER=$sock
	atf_check -s exit:0 rump.ifconfig $if inet6 $ip
	atf_check -s exit:0 rump.ifconfig $if up
	atf_check -s exit:0 rump.ifconfig -w 10

	$DEBUG && rump.ifconfig $if
}

prepare_download_file()
{
	local file=$1
	local data="0123456789"

	touch $file
	for i in `seq 1 512`
	do
		echo $data >> $file
	done
}

do_http_get()
{
	local ip=$1
	local ret=$2
	local timeout=5

	# get the webpage
	atf_check -s exit:$ret env LD_PRELOAD=/usr/lib/librumphijack.so	\
	    ftp -q $timeout -o ./out "http://[$ip]/$HTML_FILE"
}

mtudisc6_basic_body()
{
	local pkt=
	local local_ip=fc00:0:0:1::2
	local gateway_local_ip=fc00:0:0:1::1
	local gateway_remote_ip=fc00:0:0:2::1
	local remote_ip=fc00:0:0:2::2
	local prefixlen=64

	rump_server_start $SOCKLOCAL netinet6
	rump_server_start $SOCKGATEWAY netinet6
	rump_server_start $SOCKREMOTE netinet6

	#
	# Setup servers
	#
	# [local server]       [gateway server]      [remote server]
	#       |                 |        |                |
	# shmif0(1500) -- shmif1(1280)  shmif0(1500) -- shmif0(1500)
	#

	# Assign IP addresses
	setup_server $SOCKLOCAL shmif0 bus1 $local_ip/$prefixlen
	setup_server $SOCKGATEWAY shmif0 bus1 $gateway_local_ip/$prefixlen
	setup_server $SOCKGATEWAY shmif1 bus2 $gateway_remote_ip/$prefixlen
	setup_server $SOCKREMOTE shmif0 bus2 $remote_ip/$prefixlen

	### Setup gateway server
	export RUMP_SERVER=$SOCKGATEWAY

	# Set MTU of shmif0 to 1280
	export RUMP_SERVER=$SOCKGATEWAY
	atf_check -s exit:0 rump.ifconfig shmif0 mtu 1280

	# Enable IPv6 forwarding
	atf_check -s exit:0 rump.sysctl -w -q net.inet6.ip6.forwarding=1

	### Setup remote server
	export RUMP_SERVER=$SOCKREMOTE

	# Start httpd daemon
	prepare_download_file $HTML_FILE
	start_httpd $SOCKREMOTE $remote_ip
	$DEBUG && rump.netstat -a

	# Teach the peer that local serer is behind gateway server
	atf_check -s exit:0 -o ignore \
	    rump.route add -inet6 $local_ip/128 $gateway_remote_ip

	# Check path MTU size on remote server
	atf_check -s exit:0 \
	    -o match:"^$local_ip +$gateway_remote_ip +UGHS +- +- +- +shmif0" \
	    rump.netstat -nr -f inet6

	### Setup local server
	export RUMP_SERVER=$SOCKLOCAL

	# Teach the peer that remote serer is behind gateway server
	atf_check -s exit:0 -o ignore \
	    rump.route add -inet6 $remote_ip/128 $gateway_local_ip

	# Don't accept fragmented packets
	atf_check -s exit:0 -o ignore \
	    rump.sysctl -w -q net.inet6.ip6.maxfragpackets=0

	#
	# Test enabled path MTU discorvery
	#
	# Get the webpage (expect: success)
	export RUMP_SERVER=$SOCKLOCAL
	do_http_get $remote_ip 0
	$DEBUG && extract_new_packets bus2 > ./out
	$DEBUG && cat ./out

	# Check path MTU size on remote server
	export RUMP_SERVER=$SOCKREMOTE
	atf_check -s exit:0 \
	    -o match:"^$local_ip +$gateway_remote_ip +UGHS +- +- +1280 +shmif0" \
	    rump.netstat -nr -f inet6

	rump_server_destroy_ifaces
}

mtudisc6_basic_cleanup()
{

	$DEBUG && dump
	stop_httpd
	cleanup
}

atf_init_test_cases()
{

	atf_add_test_case mtudisc6_basic
}