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#!/bin/sh
# shellcheck disable=SC2039,SC1091
# https://www.shellcheck.net/wiki/SC2039 -- In POSIX sh, SC2039: In POSIX sh, string replacement is undefined.
# https://www.shellcheck.net/wiki/SC2039 -- In POSIX sh, string indexing is undefined.
# https://www.shellcheck.net/wiki/SC1091 -- Not following: /lib/functions.sh:...
# Copyright (C) 2018 Luiz Angelo Daros de Luca <luizluca@gmail.com>
#
# Pools switchdev for port changes
#
[ -n "$NICED" ] && NICED=1 exec nice -n 19 "$0" "$@"
. /usr/share/libubox/jshn.sh
. /lib/functions.sh
cpu_ports=""
json_init
json_load "$(cat /etc/board.json)"
switches=
json_get_keys switches switch
json_select switch
for switch in $switches; do
echo Loading $switch >&2
json_select "$switch"
if json_is_a ports array; then
ports=
json_get_keys ports ports
json_select ports
for port in $ports; do
echo Checking port "$port" in "$switch" >&2
json_select "$port"
num=
json_get_vars num device
if [ -n "$device" ]; then
echo "Port ${switch}_$num is CPU port as $device" >&2
cpu_ports="$cpu_ports ${switch}_$num=$device"
fi
json_select ..
done
json_select ..
fi
json_select ..
done
each_switch_vlan() {
switch=
vlan=
ports=
config_get switch "$1" device
config_get vlan "$1" vlan
config_get ports "$1" ports
[ -n "$vlan" ] || { echo "No vlan for '$1'" >&2; return 1; }
[ -n "$switch" ] || { echo "No device for '$1'" >&2; return 1; }
vlan_ifnames=""
vlan_non_cpu_ports=""
echo Checking vlan "$vlan" in $switch >&2
for port in $ports; do
case $port in
*t) tagged=1; port=${port:0:-1} ;;
*) tagged= ;;
esac
echo "Checking port $port in $switch used by vlan $vlan" >&2
cpu_port_ifname=""
for cpu_port in $cpu_ports; do
device=${cpu_port#*=}
cpu_switchport=${cpu_port%=*}
[ "${cpu_switchport}" = "${switch}_${port}" ] || continue
echo "Port $port in $switch used by $vlan is a CPU port at $device" >&2
for device_tagged in $device_tagged; do
[ "${tagged}" = 1 ] && not_tagged=0 || not_tagged=1
if [ "$device_tagged" = "$device=${not_tagged}" ]; then
echo "Cannot control CPU port ${cpu_switchport} when it is used both as tagged and not tagged"
exit 1
fi
done
device_tagged="${device_tagged} ${device}=${tagged:-0}"
cpu_port_ifname=${device}${tagged+.$vlan}
done
if [ -n "$cpu_port_ifname" ]; then
vlan_ifnames="$vlan_ifnames $cpu_port_ifname"
continue
fi
vlan_non_cpu_ports="$vlan_non_cpu_ports ${port}"
done
vlan_non_cpu_switch_ports="${vlan_non_cpu_ports// /:${switch}_}"
vlan_non_cpu_switch_ports="${vlan_non_cpu_switch_ports:1}"
vlan_non_cpu_ports="${vlan_non_cpu_ports:1}"
for vlan_ifname in $vlan_ifnames; do
devices2ports="$devices2ports $vlan_ifname=${vlan_non_cpu_switch_ports}"
echo "Monitoring $switch (ports ${vlan_non_cpu_ports// /,}) for $vlan_ifname"
done
}
device_tagged=""
devices2ports=""
config_load network
config_foreach each_switch_vlan switch_vlan
cleanup() {
for device2ports in $devices2ports; do
device=${device2ports%=*}
ip link show dev ${device}_down >/dev/null 2>&1 && {
echo "Bringing up $device on exit..."
ip link set dev ${device}_down name ${device}
ip link set dev ${device} up >/dev/null 2>&1;
}
done
echo "Stopped poller"
exit
}
trap cleanup INT TERM
echo "Starting poller"
while true; do (
for device2ports in $devices2ports; do
device=${device2ports%=*}
switch_ports=${device2ports#*=}
switch_ports=${switch_ports//:/ }
should_be_up=false
for switch_port in $switch_ports; do
state=$(eval echo \$${switch_port})
if [ -z "${state}" ]; then
switch=${switch_port%_*}
port=${switch_port#*_}
echo "Polling $switch_port..." >&2
swconfig dev $switch port $port get link | grep -q 'link:up' &&
state=up || state=down
eval "$switch_port=$state"
echo "State of $switch_port, used by $device, is $state" >&2
else
echo "State of $switch_port, used by $device, is $state (cached)" >&2
fi
[ $state = up ] && should_be_up=true
done
if $should_be_up; then
ip link show dev ${device}_down >/dev/null 2>&1 && {
echo "Bringing up $device..."
ip link set dev ${device}_down name ${device}
ip link set dev ${device} up >/dev/null 2>&1;
}
else
ip link show dev ${device} >/dev/null 2>&1 && {
echo "Bringing down $device..."
ip link set dev ${device} down >/dev/null 2>&1;
ip link set dev ${device} name ${device}_down
}
fi
done )
sleep 3
done