[v4,7/7] network/route: Rewrite route{4, 6}-change-if into new API
diff mbox series

Message ID 20190903141610.28887-8-pvorel@suse.cz
State Changes Requested
Delegated to: Petr Vorel
Headers show
Series
  • net/route: rewrite route-change-{dst, gw, if} into new API
Related show

Commit Message

Petr Vorel Sept. 3, 2019, 2:16 p.m. UTC
* Drop route command (use just ip command), support both IPv4 and IPv6
* Use unused network range to avoid clash with real network
* Add verification with ping (previous version sent UDP datagram with
ns-udpsender, but didn't verify receiving it on rhost and didn't setup
rhost ip at all)
* Add tst_get_ifaces_cnt() into tst_net.sh

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
 runtest/net_stress.route                      |   4 +-
 testcases/lib/tst_net.sh                      |   8 +
 .../network/stress/route/00_Descriptions.txt  |  18 +-
 .../network/stress/route/route-change-if.sh   |  90 +++++
 .../network/stress/route/route4-change-if     | 324 ------------------
 .../network/stress/route/route6-change-if     | 323 -----------------
 6 files changed, 103 insertions(+), 664 deletions(-)
 create mode 100755 testcases/network/stress/route/route-change-if.sh
 delete mode 100644 testcases/network/stress/route/route4-change-if
 delete mode 100644 testcases/network/stress/route/route6-change-if

Patch
diff mbox series

diff --git a/runtest/net_stress.route b/runtest/net_stress.route
index cde6d5d11..4eff6766a 100644
--- a/runtest/net_stress.route
+++ b/runtest/net_stress.route
@@ -1,12 +1,12 @@ 
 # Stress test for routing table
 route4-change-dst route-change-dst.sh
 route4-change-gw route-change-gw.sh
-route4-change-if route4-change-if
+route4-change-if route-change-if.sh
 route4-redirect route4-redirect
 route4-rmmod route4-rmmod
 
 route6-change-dst route-change-dst.sh -6
 route6-change-gw route-change-gw.sh -6
-route6-change-if route6-change-if
+route6-change-if route-change-if.sh -6
 route6-redirect route6-redirect
 route6-rmmod route6-rmmod
diff --git a/testcases/lib/tst_net.sh b/testcases/lib/tst_net.sh
index baeac6e10..16d0995ee 100644
--- a/testcases/lib/tst_net.sh
+++ b/testcases/lib/tst_net.sh
@@ -289,6 +289,14 @@  tst_get_ifaces()
 	fi
 }
 
+# Get count of test interfaces for local/remote host.
+tst_get_ifaces_cnt()
+{
+	tst_test_cmds awk
+	local type="${1:-lhost}"
+	echo "$(tst_get_ifaces $type)" | awk '{print NF}'
+}
+
 # Get HW addresses from defined test interface names.
 # tst_get_hwaddrs [TYPE]
 # TYPE: { lhost | rhost }; Default value is 'lhost'.
diff --git a/testcases/network/stress/route/00_Descriptions.txt b/testcases/network/stress/route/00_Descriptions.txt
index bb8f46da6..e0e2e42c6 100644
--- a/testcases/network/stress/route/00_Descriptions.txt
+++ b/testcases/network/stress/route/00_Descriptions.txt
@@ -6,13 +6,9 @@  route{4,6}-change-gw
 	Verify the IPv4/IPv6 is not broken when ip command changes route
 	gateway many times
 
-route4-change-if01
-	Verify the kernel is not crashed when the interface of an IPv4 route is
-	changed frequently by route command
-
-route4-change-if02
-	Verify the kernel is not crashed when the interface of an IPv4 route is
-	changed frequently by ip command
+route{4,6}-change-if
+	Verify the IPv4/IPv6 is not broken when ip command changes route
+	interface many times
 
 route4-redirect01
 	Verify the kernel is not crashed when the IPv4 route is modified by
@@ -27,14 +23,6 @@  route4-rmmod02
 	then it is deleted by the removing network driver
 
 
-route6-change-if01
-	Verify the kernel is not crashed when the interface of an IPv6 route is
-	changed frequently by route command
-
-route6-change-if02
-	Verify the kernel is not crashed when the interface of an IPv6 route is
-	changed frequently by ip command
-
 route6-redirect01
 	Verify the kernel is not crashed when the IPv6 route is modified by
 	ICMP Redirects frequently
diff --git a/testcases/network/stress/route/route-change-if.sh b/testcases/network/stress/route/route-change-if.sh
new file mode 100755
index 000000000..f2eda81b5
--- /dev/null
+++ b/testcases/network/stress/route/route-change-if.sh
@@ -0,0 +1,90 @@ 
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (c) 2019 Petr Vorel <pvorel@suse.cz>
+# Copyright (c) International Business Machines Corp., 2006
+# Author: Mitsuru Chinen <mitch@jp.ibm.com>
+#
+# Change route interface
+# lhost: 10.23.x.2, gw (on rhost): 10.23.x.1, rhost: 10.23.0.1, switching ifaces on lhost
+
+TST_TESTFUNC="test_if"
+. route-lib.sh
+TST_CLEANUP="cleanup"
+
+add_macvlan()
+{
+	local action="add"
+	local OPTIND
+	while getopts d opt; do
+		case "$opt" in
+		d) action="del";;
+		esac
+	done
+	shift $((OPTIND - 1))
+
+	local iface="$1"
+	local type="${2:-lhost}"
+
+	cmd="ip link $action $iface link $(tst_iface $type) type macvlan mode bridge"
+	if [ $type = "lhost" ]; then
+		ROD $cmd
+		[ "$action" = "add" ] || return
+		LHOST_IFACES="$LHOST_IFACES $iface"
+	else
+		tst_rhost_run -s -c "$cmd"
+		[ "$action" = "add" ] || return
+		RHOST_IFACES="$RHOST_IFACES $iface"
+	fi
+	tst_init_iface $type 1
+}
+
+setup()
+{
+	tst_res TINFO "change IPv$TST_IPVER route interface $NS_TIMES times"
+
+	rt="$(tst_ipaddr_un -p 0)"
+	rhost="$(tst_ipaddr_un 0 1)"
+	tst_add_ipaddr -s -a $rhost rhost
+
+	if [ $(tst_get_ifaces_cnt) -lt 2 ]; then
+		new_liface="ltp_mv2"
+		tst_res TINFO "2 or more local ifaces required, adding $new_liface"
+		add_macvlan $new_liface
+	fi
+
+	if [ $(tst_get_ifaces_cnt rhost) -lt 2 ]; then
+		new_riface="ltp_mv1"
+		tst_res TINFO "2 or more remote ifaces required, adding $new_riface"
+		add_macvlan $new_riface rhost
+	fi
+}
+
+test_if()
+{
+	local max=253
+	[ "$TST_IPV6" ] && max=65533
+	local net_id=$(($1 % $max + 1))
+	local gw="$(tst_ipaddr_un $net_id 1)"
+	local lhost="$(tst_ipaddr_un $net_id 2)"
+	local link_num="$(($1 % $(tst_get_ifaces_cnt)))"
+	local iface="$(tst_iface lhost $link_num)"
+
+	tst_res TINFO "testing route over interface '$iface' with gateway '$gw'"
+
+	tst_add_ipaddr -s -a $lhost lhost $link_num
+	tst_add_ipaddr -s -a $gw rhost $link_num
+	ROD ip route add $rt dev $iface via $gw
+	EXPECT_PASS ping$TST_IPV6 -c1 -I $lhost $rhost \>/dev/null
+	ROD ip route del $rt dev $iface via $gw
+	tst_del_ipaddr -s -a $lhost lhost $link_num
+	tst_del_ipaddr -s -a $gw rhost $link_num
+}
+
+cleanup()
+{
+	[ "$new_liface" ] && add_macvlan -d $new_liface
+	[ "$new_riface" ] && add_macvlan -d $new_riface rhost
+	route_cleanup
+}
+
+tst_run
diff --git a/testcases/network/stress/route/route4-change-if b/testcases/network/stress/route/route4-change-if
deleted file mode 100644
index 8753203d0..000000000
--- a/testcases/network/stress/route/route4-change-if
+++ /dev/null
@@ -1,324 +0,0 @@ 
-#!/bin/sh
-
-################################################################################
-##                                                                            ##
-## Copyright (c) International Business Machines  Corp., 2006                 ##
-##                                                                            ##
-## This program is free software;  you can redistribute it and#or modify      ##
-## it under the terms of the GNU General Public License as published by       ##
-## the Free Software Foundation; either version 2 of the License, or          ##
-## (at your option) any later version.                                        ##
-##                                                                            ##
-## This program is distributed in the hope that it will be useful, but        ##
-## WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY ##
-## or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License   ##
-## for more details.                                                          ##
-##                                                                            ##
-## You should have received a copy of the GNU General Public License          ##
-## along with this program;  if not, write to the Free Software               ##
-## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA    ##
-##                                                                            ##
-##                                                                            ##
-################################################################################
-#
-# File:
-#   route4-change-if
-#
-# Description:
-#   Verify the kernel is not crashed when the interface of an IPv4 route is
-#   changed frequently
-#    test01 - by route command
-#    test02 - by ip command
-#
-# Setup:
-#   See testcases/network/stress/README
-#
-# Author:
-#   Mitsuru Chinen <mitch@jp.ibm.com>
-#
-# History:
-#	Mar 17 2006 - Created (Mitsuru Chinen)
-#
-#-----------------------------------------------------------------------
-# Uncomment line below for debug output.
-#trace_logic=${trace_logic:-"set -x"}
-$trace_logic
-
-# Make sure the value of LTPROOT
-LTPROOT=${LTPROOT:-`(cd ../../../../ ; pwd)`}
-export LTPROOT
-
-# Total number of the test case
-TST_TOTAL=2
-export TST_TOTAL
-
-# Default of the test case ID and the test case count
-TCID=route4-change-if
-TST_COUNT=0
-export TCID
-export TST_COUNT
-
-# Check the environmanet variable
-. check_envval || exit $TST_TOTAL
-
-# The number of times where route is changed
-NS_TIMES=${NS_TIMES:-10000}
-
-# The first 2 ocnted of the Network portion of the gateway address
-IPV4_NETWORK_PRE=${IPV4_NETWORK_PRE:-"10.0"}
-
-# Netmask of for the gateway
-IPV4_NETMASK_NUM=24
-
-# Host portion of the IPv4 address
-LHOST_IPV4_HOST=${LHOST_IPV4_HOST:-"2"}	# src
-RHOST_IPV4_HOST=${RHOST_IPV4_HOST:-"1"}	# gateway
-
-# The destination network
-DST_NETWORK="10.10.0"	# destination network would be 10.10.0.0/24
-DST_HOST="5"
-DST_PORT="7"
-
-
-#-----------------------------------------------------------------------
-#
-# NAME:
-#   do_setup
-#
-# DESCRIPTION:
-#   Make a IPv4 connectivity
-#
-# SET VALUES:
-#   rhost_ipv4addr	- IPv4 Address of the remote host
-#   lhost_ifname	- Interface name of the local host
-#   rhost_ifname	- Interface name of the remote host
-#
-#-----------------------------------------------------------------------
-do_setup()
-{
-    TCID=route4-change-if
-    TST_COUNT=0
-
-    # Get the number of the test links
-    link_total=`echo $LHOST_HWADDRS | wc -w`
-    rhost_link_total=`echo $RHOST_HWADDRS | wc -w`
-    if [ $link_total -ne $rhost_link_total ]; then
-	tst_resm TBROK "The number of element in LHOST_HWADDRS differs from RHOST_HWADDRS"
-	exit $TST_TOTAL
-    fi
-    if [ $link_total -lt 2 ]; then
-	tst_resm TBROK "This test case requires plural Test Links"
-	exit $TST_TOTAL
-    fi
-
-    lhost_ifname_array=""
-    rhost_ifname_array=""
-    link_num=0
-    while [ $link_num -lt $link_total ]; do
-	# Get the Interface names of the local host
-	lhost_ifname=`get_ifname lhost ${link_num}`
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Failed to get the interface name at the local host"
-	    exit $TST_TOTAL
-	fi
-	lhost_ifname_array="$lhost_ifname_array $lhost_ifname"
-
-	# Get the Interface names of the remote host
-	rhost_ifname=`get_ifname rhost ${link_num}`
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Failed to get the interface name at the remote host"
-	    exit $TST_TOTAL
-	fi
-	rhost_ifname_array="$rhost_ifname_array $rhost_ifname"
-
-	# Initialize the interfaces of the remote host
-	initialize_if rhost ${link_num}
-
-	# Set IPv4 address to the interface of the remote host
-	set_ipv4addr rhost ${link_num} "${IPV4_NETWORK_PRE}.${link_num}" ${RHOST_IPV4_HOST}
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Failed to assign IP address to the interface $rhost_ifname at the remote host"
-	    exit $TST_TOTAL
-	fi
-
-	link_num=`expr $link_num + 1`
-    done
-}
-
-
-
-
-#-----------------------------------------------------------------------
-#
-# NAME:
-#   do_cleanup
-#
-# DESCRIPTION:
-#   Recover the tested interfaces
-#
-#-----------------------------------------------------------------------
-do_cleanup()
-{
-    # Make sure to kill the udp datagram sender
-    killall -SIGHUP ns-udpsender >/dev/null 2>&1
-
-    # Initialize the interfaces
-    link_num=0
-    while [ $link_num -lt $link_total ]; do
-	initialize_if lhost ${link_num}
-	initialize_if rhost ${link_num}
-	link_num=`expr $link_num + 1`
-    done
-}
-
-
-#-----------------------------------------------------------------------
-#
-# FUNCTION:
-#   test_body
-#
-# DESCRIPTION:
-#   main code of the test
-#
-# Arguments:
-#   $1: define the test type
-#       1 - route command case
-#       2 - ip command case
-#
-#-----------------------------------------------------------------------
-test_body()
-{
-    test_type=$1
-
-    TCID=route4-change-if0${test_type}
-    TST_COUNT=$test_type
-
-    case $test_type in
-	1)
-	test_command="route"
-	;;
-	2)
-	test_command="ip"
-	;;
-	*)
-	tst_resm TBROK "unspecified case"
-	return 1
-	;;
-    esac
-
-    tst_resm TINFO "Verify the kernel is not crashed when the interface of an IPv4 route is changed frequently by $test_command command in $NS_TIMES times"
-
-    link_num=0
-    while [ $link_num -lt $link_total ]; do
-	# Initialize the interface of the local host
-	initialize_if lhost ${link_num}
-
-	# Assign IPv4 address to the interface of the local host
-	set_ipv4addr lhost ${link_num} "${IPV4_NETWORK_PRE}.${link_num}" ${LHOST_IPV4_HOST}
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Failed to assign an IPv4 address at the local host"
-	    return 1
-	fi
-
-	# Check the connectivity to the gateway
-	field=`expr $link_num + 1`
-	lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
-	check_icmpv4_connectivity $lhost_ifname "${IPV4_NETWORK_PRE}.${link_num}.${LHOST_IPV4_HOST}"
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Test Link $link_num is somthing wrong."
-	    return 1
-	fi
-	link_num=`expr $link_num + 1`
-    done
-
-    # Set the variables regarding the destination host
-    dst_addr=${DST_NETWORK}.${DST_HOST}
-    dst_network=${DST_NETWORK}.0
-
-    # Set the first route
-    link_num=0
-    field=`expr $link_num + 1`
-    lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
-    gateway="${IPV4_NETWORK_PRE}.${link_num}.${RHOST_IPV4_HOST}"
-    case $test_type in
-	1)
-	route add -net $dst_network netmask 255.255.255.0 gw $gateway dev $lhost_ifname
-	;;
-	2)
-	ip route add ${dst_network}/24 via $gateway dev $lhost_ifname
-	;;
-    esac
-
-    # Load the route with UDP traffic
-    ns-udpsender -f 4 -D $dst_addr -p $DST_PORT -b -s 1472
-    if [ $? -ne 0 ]; then
-	tst_resm TFAIL "Failed to run a UDP datagram sender"
-	return 1
-    fi
-
-    # Loop for changing the route
-    cnt=0
-    while [ $cnt -lt $NS_TIMES ]; do
-	link_num=`expr $link_num + 1`
-	if [ $link_num -ge $link_total ]; then
-	    link_num=0
-	fi
-
-	pre_lhost_ifname=$lhost_ifname
-	pre_gateway=$gateway
-
-	field=`expr $link_num + 1`
-	lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
-	gateway="${IPV4_NETWORK_PRE}.${link_num}.${RHOST_IPV4_HOST}"
-
-	case $test_type in
-	    1)
-	    route add -net $dst_network netmask 255.255.255.0 gw $gateway dev $lhost_ifname
-	    route del -net $dst_network netmask 255.255.255.0 gw $pre_gateway dev $pre_lhost_ifname
-	    ;;
-	    2)
-	    ip route change ${dst_network}/24 via $gateway dev $lhost_ifname
-	    ;;
-	esac
-	if [ $? -ne 0 ]; then
-	    tst_resm TFAIL "Failed to change the gateway to $gateway"
-	    return 1
-	fi
-
-	# Rerun if udp datagram sender is dead
-	ps auxw | fgrep -v grep | grep ns-udpsender > /dev/null
-	if [ $? -ne 0 ]; then
-	    ns-udpsender -f 4 -D $dst_addr -p $DST_PORT -b -s 1472
-	    if [ $? -ne 0 ]; then
-		tst_resm TFAIL "Failed to run a UDP datagram sender"
-		return 1
-	    fi
-	fi
-
-	cnt=`expr $cnt + 1`
-    done
-
-    # Kill the udp datagram sender
-    killall -SIGHUP ns-udpsender
-
-    tst_resm TPASS "Test is finished correctly."
-    return 0
-}
-
-
-#-----------------------------------------------------------------------
-#
-# Main
-#
-# Exit Value:
-#   The number of the failure
-#
-#-----------------------------------------------------------------------
-
-RC=0
-do_setup
-test_body 1 || RC=`expr $RC + 1`      # Case of route command
-test_body 2 || RC=`expr $RC + 1`      # Case of ip command
-do_cleanup
-
-exit $RC
diff --git a/testcases/network/stress/route/route6-change-if b/testcases/network/stress/route/route6-change-if
deleted file mode 100644
index 051ba8bcc..000000000
--- a/testcases/network/stress/route/route6-change-if
+++ /dev/null
@@ -1,323 +0,0 @@ 
-#!/bin/sh
-
-################################################################################
-##                                                                            ##
-## Copyright (c) International Business Machines  Corp., 2006                 ##
-##                                                                            ##
-## This program is free software;  you can redistribute it and#or modify      ##
-## it under the terms of the GNU General Public License as published by       ##
-## the Free Software Foundation; either version 2 of the License, or          ##
-## (at your option) any later version.                                        ##
-##                                                                            ##
-## This program is distributed in the hope that it will be useful, but        ##
-## WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY ##
-## or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License   ##
-## for more details.                                                          ##
-##                                                                            ##
-## You should have received a copy of the GNU General Public License          ##
-## along with this program;  if not, write to the Free Software               ##
-## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA    ##
-##                                                                            ##
-##                                                                            ##
-################################################################################
-#
-# File:
-#   route6-change-if
-#
-# Description:
-#   Verify the kernel is not crashed when the interface of an IPv6 route is
-#   changed frequently
-#    test01 - by route command
-#    test02 - by ip command
-#
-# Setup:
-#   See testcases/network/stress/README
-#
-# Author:
-#   Mitsuru Chinen <mitch@jp.ibm.com>
-#
-# History:
-#	Mar 17 2006 - Created (Mitsuru Chinen)
-#
-#-----------------------------------------------------------------------
-# Uncomment line below for debug output.
-#trace_logic=${trace_logic:-"set -x"}
-$trace_logic
-
-# Make sure the value of LTPROOT
-LTPROOT=${LTPROOT:-`(cd ../../../../ ; pwd)`}
-export LTPROOT
-
-# Total number of the test case
-TST_TOTAL=2
-export TST_TOTAL
-
-# Default of the test case ID and the test case count
-TCID=route6-change-if
-TST_COUNT=0
-export TCID
-export TST_COUNT
-
-# Check the environmanet variable
-. check_envval || exit $TST_TOTAL
-
-# The number of times where route is changed
-NS_TIMES=${NS_TIMES:-10000}
-
-# The first 2 ocnted of the Network portion of the gateway address
-IPV6_NETWORK_PRE="fec0:1:1"
-
-# Netmask of for the gateway
-IPV6_NETMASK_NUM=64
-
-# Host portion of the IPv6 address
-LHOST_IPV6_HOST=":2"	# src
-RHOST_IPV6_HOST=":1"	# gateway
-
-# The destination network
-DST_NETWORK="fd00:100:1:1"      # dest network would be fd00:100:1:1:::/64
-DST_HOST=":5"
-DST_PORT="7"
-
-
-#-----------------------------------------------------------------------
-#
-# NAME:
-#   do_setup
-#
-# DESCRIPTION:
-#   Make a IPv6 connectivity
-#
-# SET VALUES:
-#   rhost_ipv6addr	- IPv6 Address of the remote host
-#   lhost_ifname	- Interface name of the local host
-#   rhost_ifname	- Interface name of the remote host
-#
-#-----------------------------------------------------------------------
-do_setup()
-{
-    TCID=route6-change-if
-    TST_COUNT=0
-
-    # Get the number of the test links
-    link_total=`echo $LHOST_HWADDRS | wc -w`
-    rhost_link_total=`echo $RHOST_HWADDRS | wc -w`
-    if [ $link_total -ne $rhost_link_total ]; then
-	tst_resm TBROK "The number of element in LHOST_HWADDRS differs from RHOST_HWADDRS"
-	exit $TST_TOTAL
-    fi
-    if [ $link_total -lt 2 ]; then
-	tst_resm TBROK "This test case requires plural Test Links"
-	exit $TST_TOTAL
-    fi
-
-    lhost_ifname_array=""
-    rhost_ifname_array=""
-    link_num=0
-    while [ $link_num -lt $link_total ]; do
-	# Get the Interface names of the local host
-	lhost_ifname=`get_ifname lhost ${link_num}`
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Failed to get the interface name at the local host"
-	    exit $TST_TOTAL
-	fi
-	lhost_ifname_array="$lhost_ifname_array $lhost_ifname"
-
-	# Get the Interface names of the remote host
-	rhost_ifname=`get_ifname rhost ${link_num}`
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Failed to get the interface name at the remote host"
-	    exit $TST_TOTAL
-	fi
-	rhost_ifname_array="$rhost_ifname_array $rhost_ifname"
-
-	# Initialize the interfaces of the remote host
-	initialize_if rhost ${link_num}
-
-	# Set IPv6 address to the interface of the remote host
-	add_ipv6addr rhost ${link_num} "${IPV6_NETWORK_PRE}:${link_num}" ${RHOST_IPV6_HOST}
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Failed to assign IP address to the interface $rhost_ifname at the remote host"
-	    exit $TST_TOTAL
-	fi
-
-	link_num=`expr $link_num + 1`
-    done
-}
-
-
-#-----------------------------------------------------------------------
-#
-# NAME:
-#   do_cleanup
-#
-# DESCRIPTION:
-#   Recover the tested interfaces
-#
-#-----------------------------------------------------------------------
-do_cleanup()
-{
-    # Make sure to kill the udp datagram sender
-    killall -SIGHUP ns-udpsender >/dev/null 2>&1
-
-    # Initialize the interfaces
-    link_num=0
-    while [ $link_num -lt $link_total ]; do
-	initialize_if lhost ${link_num}
-	initialize_if rhost ${link_num}
-	link_num=`expr $link_num + 1`
-    done
-}
-
-
-#-----------------------------------------------------------------------
-#
-# FUNCTION:
-#   test_body
-#
-# DESCRIPTION:
-#   main code of the test
-#
-# Arguments:
-#   $1: define the test type
-#       1 - route command case
-#       2 - ip command case
-#
-#-----------------------------------------------------------------------
-test_body()
-{
-    test_type=$1
-
-    TCID=route6-change-if0${test_type}
-    TST_COUNT=$test_type
-
-    case $test_type in
-	1)
-	test_command="route"
-	;;
-	2)
-	test_command="ip"
-	;;
-	*)
-	tst_resm TBROK "unspecified case"
-	return 1
-	;;
-    esac
-
-    tst_resm TINFO "Verify the kernel is not crashed when the interface of an IPv6 route is changed frequently by $test_command command in $NS_TIMES times"
-
-    link_num=0
-    while [ $link_num -lt $link_total ]; do
-	# Initialize the interface of the local host
-	initialize_if lhost ${link_num}
-
-	# Assign IPv6 address to the interface of the local host
-	add_ipv6addr lhost ${link_num} "${IPV6_NETWORK_PRE}:${link_num}" ${LHOST_IPV6_HOST}
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Failed to assign an IPv6 address at the local host"
-	    return 1
-	fi
-
-	# Check the connectivity to the gateway
-	field=`expr $link_num + 1`
-	lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
-	check_icmpv6_connectivity $lhost_ifname "${IPV6_NETWORK_PRE}:${link_num}:${LHOST_IPV6_HOST}"
-	if [ $? -ne 0 ]; then
-	    tst_resm TBROK "Test Link $link_num is somthing wrong."
-	    return 1
-	fi
-	link_num=`expr $link_num + 1`
-    done
-
-    # Set the variables regarding the destination host
-    dst_addr=${DST_NETWORK}:${DST_HOST}
-    dst_network=${DST_NETWORK}::
-
-    # Set the first route
-    link_num=0
-    field=`expr $link_num + 1`
-    lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
-    gateway="${IPV6_NETWORK_PRE}:${link_num}:${RHOST_IPV6_HOST}"
-    case $test_type in
-	1)
-	route -A inet6 add ${dst_network}/64 gw $gateway dev $lhost_ifname
-	;;
-	2)
-	ip -f inet6 route add ${dst_network}/64 via $gateway dev $lhost_ifname
-	;;
-    esac
-
-    # Load the route with UDP traffic
-    ns-udpsender -f 6 -D $dst_addr -p $DST_PORT -b -s 1452
-    if [ $? -ne 0 ]; then
-	tst_resm TFAIL "Failed to run a UDP datagram sender"
-	return 1
-    fi
-
-    # Loop for changing the route
-    cnt=0
-    while [ $cnt -lt $NS_TIMES ]; do
-	link_num=`expr $link_num + 1`
-	if [ $link_num -ge $link_total ]; then
-	    link_num=0
-	fi
-
-	pre_lhost_ifname=$lhost_ifname
-	pre_gateway=$gateway
-
-	field=`expr $link_num + 1`
-	lhost_ifname=`echo $lhost_ifname_array | cut -d ' ' -f $field`
-	gateway="${IPV6_NETWORK_PRE}:${link_num}:${RHOST_IPV6_HOST}"
-
-	case $test_type in
-	    1)
-	    route -A inet6 add ${dst_network}/64 gw $gateway dev $lhost_ifname
-	    route -A inet6 del ${dst_network}/64 gw $pre_gateway dev $pre_lhost_ifname
-	    ;;
-	    2)
-	    ip -f inet6 route add ${dst_network}/64 via $gateway dev $lhost_ifname
-	    ip -f inet6 route del ${dst_network}/64 via $pre_gateway dev $pre_lhost_ifname
-	    ;;
-	esac
-	if [ $? -ne 0 ]; then
-	    tst_resm TFAIL "Failed to change the gateway to $gateway"
-	    return 1
-	fi
-
-	# Rerun if udp datagram sender is dead
-	ps auxw | fgrep -v grep | grep ns-udpsender > /dev/null
-	if [ $? -ne 0 ]; then
-	    ns-udpsender -f 6 -D $dst_addr -p $DST_PORT -b -s 1452
-	    if [ $? -ne 0 ]; then
-		tst_resm TFAIL "Failed to run a UDP datagram sender"
-		return 1
-	    fi
-	fi
-
-	cnt=`expr $cnt + 1`
-    done
-
-    # Kill the udp datagram sender
-    killall -SIGHUP ns-udpsender
-
-    tst_resm TPASS "Test is finished correctly."
-    return 0
-}
-
-
-#-----------------------------------------------------------------------
-#
-# Main
-#
-# Exit Value:
-#   The number of the failure
-#
-#-----------------------------------------------------------------------
-
-RC=0
-do_setup
-test_body 1 || RC=`expr $RC + 1`      # Case of route command
-test_body 2 || RC=`expr $RC + 1`      # Case of ip command
-do_cleanup
-
-exit $RC