Created
February 26, 2023 20:15
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A small shellscript to work around a FreeBSD bug (208910) that requires you to move the vlan onto an epair member of the bridge, not on the physical interface in the bridge.
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#!/bin/sh | |
set -o errexit -o pipefail -o nounset -o noclobber -o noglob | |
# Copyright (c) 2023 Andrew Hewus Fresh <andrew@afresh1.com> | |
# | |
# Permission to use, copy, modify, and distribute this software for any | |
# purpose with or without fee is hereby granted, provided that the above | |
# copyright notice and this permission notice appear in all copies. | |
# | |
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
usage() { | |
echo "$( basename $0 ) vlan [ bridge ]" | |
exit ${1-0} | |
} | |
err() { | |
echo "$1" >&2 | |
exit 1 | |
} | |
if [ $# -lt 1 ] || [ $# -gt 2 ]; then | |
usage 1 | |
fi | |
if [ "$1" = "-h" ]; then | |
cat <<EOL | |
The '$(basename "$0")' tool works around a FreeBSD bug | |
when an interface both needs to be a bridge member and have a vlan | |
on top of it. | |
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208910 | |
EOL | |
exit | |
fi | |
description="workaround for vlan bridge bug" | |
vlan=$1; shift | |
vid="$( ifconfig $vlan | sed -n 's/.*vlan: \([0-9][0-9]*\) .*/\1/p' )" | |
bridge=bridge0 | |
if [ $# -gt 0 ]; then | |
bridge=$1; shift | |
fi | |
parent="$( ifconfig "$vlan" | sed -n 's/.*parent interface: //p' )" | |
[ "$parent" ] || err "Unable to find parent interface for $vlan" | |
if [ "$parent" != "${parent#epair}" ]; then | |
echo "Already worked around" | |
exit 0 | |
fi | |
epair=epair0 | |
while ifconfig "$epair"a > /dev/null 2>&1; do | |
ifconfig "$epair"a | grep -q "description: $description" && break | |
epair=epair$(( ${epair#epair} + 1 )) | |
done | |
ifconfig "$epair"a > /dev/null 2>&1 || ifconfig "$epair" create | |
ifconfig "$epair"a description "$description" | |
ifconfig "$epair"b description "$description" | |
ifconfig "$bridge" > /dev/null 2>&1 || ifconfig "$bridge" create | |
for i in "$epair"a "$epair"b "$bridge"; do | |
ifconfig "$i" up | |
done | |
ifconfig "$bridge" | grep -q "member: $parent " || | |
ifconfig "$bridge" addm "$parent" | |
ifconfig "$bridge" addm "$epair"a | |
ifconfig "$vlan" -vlandev -wlanaddr | |
ifconfig "$vlan" vlan "$vid" vlandev "$epair"b |
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