blob: 726eb5d258397a6a174cfd3f6bae9edaab7f6b64 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
#!/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 $?
|
