1 #!/bin/sh 2 # Copyright (c) 2017-2018 Petr Vorel <pvorel (at] suse.cz> 3 # Copyright (c) 2015-2017 Oracle and/or its affiliates. All Rights Reserved. 4 # Copyright (c) International Business Machines Corp., 2005 5 # 6 # This program is free software; you can redistribute it and/or 7 # modify it under the terms of the GNU General Public License as 8 # published by the Free Software Foundation; either version 2 of 9 # the License, or (at your option) any later version. 10 # 11 # This program is distributed in the hope that it would be useful, 12 # but WITHOUT ANY WARRANTY; without even the implied warranty of 13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 # GNU General Public License for more details. 15 # 16 # You should have received a copy of the GNU General Public License 17 # along with this program. If not, see <http://www.gnu.org/licenses/>. 18 # 19 # Author: Mitsuru Chinen <mitch (at] jp.ibm.com> 20 21 IF_CMD='ifconfig' 22 TST_SETUP="do_setup" 23 TST_CLEANUP="do_cleanup" 24 . if-lib.sh 25 26 # The interval of the mtu change [second] 27 CHANGE_INTERVAL=${CHANGE_INTERVAL:-5} 28 29 # The array of the value which MTU is changed into sequentially 30 # 552 - net.ipv4.route.min_pmtu 31 CHANGE_VALUES="784 1142 552 1500 552 1500 552 748 552 1142 1500" 32 CHANGE6_VALUES="1280 1445 1335 1390 1500 1280 1500 1280 1335 1500" 33 saved_mtu= 34 35 do_setup() 36 { 37 [ "$TST_IPV6" ] && CHANGE_VALUES=$CHANGE6_VALUES 38 if_setup 39 saved_mtu="$(cat /sys/class/net/$(tst_iface)/mtu)" 40 } 41 42 do_cleanup() 43 { 44 if_cleanup_restore 45 if [ "$saved_mtu" ]; then 46 ip li set $(tst_iface) mtu $saved_mtu 47 tst_rhost_run -c "ip li set $(tst_iface rhost) mtu $saved_mtu" 48 fi 49 } 50 51 test_body() 52 { 53 local cmd="$CMD" 54 55 local iface=$(tst_iface) 56 local iface_rmt=$(tst_iface rhost) 57 [ "$TST_IPV6" ] && local netmask=64 || local netmask=16 58 59 tst_res TINFO "'$cmd' changes MTU $MTU_CHANGE_TIMES times" \ 60 "every $CHANGE_INTERVAL seconds" 61 62 mtu_array_len=$(echo $CHANGE_VALUES | wc -w) 63 local cnt=0 64 while [ $cnt -lt $MTU_CHANGE_TIMES ]; do 65 local nth=$(($cnt % $mtu_array_len)) 66 field=$(($nth + 1)) 67 cnt=$(($cnt + 1)) 68 mtu=$(echo $CHANGE_VALUES | cut -d ' ' -f $field) 69 [ $cnt -eq $MTU_CHANGE_TIMES ] && mtu="$saved_mtu" 70 71 make_background_tcp_traffic 72 73 tst_res TINFO "set MTU to $mtu $cnt/$MTU_CHANGE_TIMES" 74 local ret=0 75 case $cmd in 76 ifconfig) ifconfig $iface mtu $mtu || ret=1 77 tst_rhost_run -c "ifconfig $iface_rmt mtu $mtu" 78 ;; 79 ip) ip link set $iface mtu $mtu || ret=1 80 tst_rhost_run -c "ip link set $iface_rmt mtu $mtu" 81 ;; 82 esac 83 84 if [ $? -ne 0 -o $ret -ne 0 ]; then 85 tst_res TFAIL "Failed to change the mtu at $cnt time" 86 return 87 fi 88 89 tst_sleep $CHANGE_INTERVAL 90 91 tst_ping $(tst_ipaddr) $(tst_ipaddr rhost) "1 1000 65507" 92 done 93 } 94 95 tst_run 96
