121 lines
2.8 KiB
Bash
Executable File
121 lines
2.8 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-or-later
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# Copyright (c) 2017-2021 Petr Vorel <pvorel@suse.cz>
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# Copyright (c) 2015-2017 Oracle and/or its affiliates. All Rights Reserved.
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# Copyright (c) International Business Machines Corp., 2005
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# Author: Mitsuru Chinen <mitch@jp.ibm.com>
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IF_CMD='ifconfig'
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TST_SETUP="do_setup"
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TST_CLEANUP="do_cleanup"
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. if-lib.sh
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# CHANGE_INTERVAL: The interval of the mtu change
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TST_TIMEOUT=1
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if tst_net_use_netns; then
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CHANGE_INTERVAL=${CHANGE_INTERVAL:-100ms}
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else
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CHANGE_INTERVAL=${CHANGE_INTERVAL:-5}
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fi
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tst_is_int $CHANGE_INTERVAL && TST_TIMEOUT=$CHANGE_INTERVAL
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TST_TIMEOUT=$(((TST_TIMEOUT + 30) * MTU_CHANGE_TIMES))
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# The array of the value which MTU is changed into sequentially
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# 552 - net.ipv4.route.min_pmtu
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CHANGE_VALUES="784 1142 552 1500 552 1500 552 748 552 1142 1500"
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CHANGE6_VALUES="1280 1445 1335 1390 1500 1280 1500 1280 1335 1500"
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saved_mtu=
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MAX_PACKET_SIZE=65507
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set_mtu()
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{
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local mtu="$1"
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local cmd="$2"
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local ret=0
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local iface=$(tst_iface)
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local iface_rmt=$(tst_iface rhost)
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case $cmd in
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ifconfig) ifconfig $iface mtu $mtu || ret=1
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tst_rhost_run -c "ifconfig $iface_rmt mtu $mtu" || ret=1
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;;
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ip) ip link set $iface mtu $mtu || ret=1
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tst_rhost_run -c "ip link set $iface_rmt mtu $mtu" || ret=1
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;;
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*) tst_brk TBROK "unknown cmd '$cmd'"
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;;
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esac
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return $ret
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}
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find_ipv4_max_packet_size()
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{
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local min_mtu=552
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local size=$MAX_PACKET_SIZE
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set_mtu $min_mtu $CMD || tst_brk TBROK "failed to set MTU to $mtu"
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tst_res TINFO "checking max MTU"
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while [ $size -gt 0 ]; do
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if ping -I $(tst_iface) -c1 -w1 -s $size $(tst_ipaddr rhost) >/dev/null; then
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tst_res TINFO "use max MTU $size"
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MAX_PACKET_SIZE=$size
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return
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fi
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size=$((size - 500))
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done
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tst_brk TBROK "failed to find max MTU"
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}
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do_setup()
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{
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[ "$TST_IPV6" ] && CHANGE_VALUES=$CHANGE6_VALUES
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if_setup
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saved_mtu="$(cat /sys/class/net/$(tst_iface)/mtu)"
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[ "$TST_IPV6" ] || find_ipv4_max_packet_size
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}
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do_cleanup()
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{
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if_cleanup_restore
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if [ "$saved_mtu" ]; then
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ip li set $(tst_iface) mtu $saved_mtu
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tst_rhost_run -c "ip li set $(tst_iface rhost) mtu $saved_mtu"
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fi
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}
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test_body()
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{
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local cmd="$CMD"
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local msg="'$cmd' changes MTU $MTU_CHANGE_TIMES times every $CHANGE_INTERVAL"
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tst_is_int $CHANGE_INTERVAL && msg="$msg seconds"
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tst_res TINFO "$msg"
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mtu_array_len=$(echo $CHANGE_VALUES | wc -w)
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local cnt=0
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while [ $cnt -lt $MTU_CHANGE_TIMES ]; do
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local nth=$(($cnt % $mtu_array_len))
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field=$(($nth + 1))
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cnt=$(($cnt + 1))
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mtu=$(echo $CHANGE_VALUES | cut -d ' ' -f $field)
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[ $cnt -eq $MTU_CHANGE_TIMES ] && mtu="$saved_mtu"
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make_background_tcp_traffic
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tst_res TINFO "set MTU to $mtu $cnt/$MTU_CHANGE_TIMES"
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if ! set_mtu $mtu $cmd; then
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tst_res TFAIL "failed to change MTU to $mtu at $cnt time"
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return
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fi
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tst_sleep $CHANGE_INTERVAL
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tst_ping -s "1 $((mtu / 2)) $mtu $MAX_PACKET_SIZE"
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done
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}
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tst_run
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