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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-08-15 20:26:38 +00:00
5777d1871b
Added a test for variable PMTU in broadcast routes. This test uses iputils' ping and attempts to send a ping between two peers, which should result in a regular echo reply. This test will fail when the receiving peer does not receive the echo request due to a lack of packet fragmentation. Signed-off-by: Oscar Maes <oscmaes92@gmail.com> Link: https://patch.msgid.link/20250710142714.12986-2-oscmaes92@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
48 lines
1.3 KiB
Bash
Executable File
48 lines
1.3 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Ensures broadcast route MTU is respected
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CLIENT_NS=$(mktemp -u client-XXXXXXXX)
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CLIENT_IP4="192.168.0.1/24"
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CLIENT_BROADCAST_ADDRESS="192.168.0.255"
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SERVER_NS=$(mktemp -u server-XXXXXXXX)
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SERVER_IP4="192.168.0.2/24"
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setup() {
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ip netns add "${CLIENT_NS}"
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ip netns add "${SERVER_NS}"
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ip -net "${SERVER_NS}" link add link1 type veth peer name link0 netns "${CLIENT_NS}"
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ip -net "${CLIENT_NS}" link set link0 up
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ip -net "${CLIENT_NS}" link set link0 mtu 9000
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ip -net "${CLIENT_NS}" addr add "${CLIENT_IP4}" dev link0
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ip -net "${SERVER_NS}" link set link1 up
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ip -net "${SERVER_NS}" link set link1 mtu 1500
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ip -net "${SERVER_NS}" addr add "${SERVER_IP4}" dev link1
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read -r -a CLIENT_BROADCAST_ENTRY <<< "$(ip -net "${CLIENT_NS}" route show table local type broadcast)"
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ip -net "${CLIENT_NS}" route del "${CLIENT_BROADCAST_ENTRY[@]}"
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ip -net "${CLIENT_NS}" route add "${CLIENT_BROADCAST_ENTRY[@]}" mtu 1500
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ip net exec "${SERVER_NS}" sysctl -wq net.ipv4.icmp_echo_ignore_broadcasts=0
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}
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cleanup() {
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ip -net "${SERVER_NS}" link del link1
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ip netns del "${CLIENT_NS}"
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ip netns del "${SERVER_NS}"
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}
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trap cleanup EXIT
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setup &&
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echo "Testing for broadcast route MTU" &&
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ip net exec "${CLIENT_NS}" ping -f -M want -q -c 1 -s 8000 -w 1 -b "${CLIENT_BROADCAST_ADDRESS}" > /dev/null 2>&1
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exit $?
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