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- #!/bin/bash
- # SPDX-License-Identifier: GPL-2.0
- #
- # Ensures broadcast route MTU is respected
- CLIENT_NS=$(mktemp -u client-XXXXXXXX)
- CLIENT_IP4="192.168.0.1/24"
- CLIENT_BROADCAST_ADDRESS="192.168.0.255"
- SERVER_NS=$(mktemp -u server-XXXXXXXX)
- SERVER_IP4="192.168.0.2/24"
- setup() {
- ip netns add "${CLIENT_NS}"
- ip netns add "${SERVER_NS}"
- ip -net "${SERVER_NS}" link add link1 type veth peer name link0 netns "${CLIENT_NS}"
- ip -net "${CLIENT_NS}" link set link0 up
- ip -net "${CLIENT_NS}" link set link0 mtu 9000
- ip -net "${CLIENT_NS}" addr add "${CLIENT_IP4}" dev link0
- ip -net "${SERVER_NS}" link set link1 up
- ip -net "${SERVER_NS}" link set link1 mtu 1500
- ip -net "${SERVER_NS}" addr add "${SERVER_IP4}" dev link1
- read -r -a CLIENT_BROADCAST_ENTRY <<< "$(ip -net "${CLIENT_NS}" route show table local type broadcast)"
- ip -net "${CLIENT_NS}" route del "${CLIENT_BROADCAST_ENTRY[@]}"
- ip -net "${CLIENT_NS}" route add "${CLIENT_BROADCAST_ENTRY[@]}" mtu 1500
- ip net exec "${SERVER_NS}" sysctl -wq net.ipv4.icmp_echo_ignore_broadcasts=0
- }
- cleanup() {
- ip -net "${SERVER_NS}" link del link1
- ip netns del "${CLIENT_NS}"
- ip netns del "${SERVER_NS}"
- }
- trap cleanup EXIT
- setup &&
- echo "Testing for broadcast route MTU" &&
- ip net exec "${CLIENT_NS}" ping -f -M want -q -c 1 -s 8000 -w 1 -b "${CLIENT_BROADCAST_ADDRESS}" > /dev/null 2>&1
- exit $?
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