Netgear R8500 路由器 OpenWRT 5G信号 看门狗

wifi5-watchdog.sh

#!/bin/sh
# Restart R8500 5 GHz APs after brcmfmac firmware crash.
# radio0 = NETGEAR_5G-2 (phy0), radio2 = NETGEAR_5G-1 (phy2)

LOCK=/var/run/wifi5-watchdog.lock
STATE_DIR=/tmp/wifi5-watchdog
RESTART_LOG=$STATE_DIR/restarts
MAX_RESTARTS_PER_HOUR=6
MISS_NEEDED=2
COOLDOWN_SEC=90
TAG=wifi5-watchdog

mkdir -p "$STATE_DIR"

if ! lock -n "$LOCK" 2>/dev/null; then
	exit 0
fi
trap 'lock -u "$LOCK" 2>/dev/null' EXIT

now=$(date +%s)

if [ -f "$STATE_DIR/cooldown" ]; then
	cool=$(cat "$STATE_DIR/cooldown" 2>/dev/null)
	if [ -n "$cool" ] && [ $((now - cool)) -lt "$COOLDOWN_SEC" ]; then
		exit 0
	fi
fi

iface_is_ap() {
	iw dev "$1" info 2>/dev/null | grep -q "type AP"
}

radio_enabled() {
	[ "$(uci -q get "wireless.${1}.disabled")" != "1" ]
}

prune_restarts() {
	[ -f "$RESTART_LOG" ] || return 0
	awk -v now="$now" '$1 >= now-3600 { print }' "$RESTART_LOG" > "$RESTART_LOG.tmp"
	mv "$RESTART_LOG.tmp" "$RESTART_LOG"
}

too_many_restarts() {
	prune_restarts
	count=$(wc -l < "$RESTART_LOG" 2>/dev/null || echo 0)
	[ "$count" -ge "$MAX_RESTARTS_PER_HOUR" ]
}

record_restart() {
	echo "$now" >> "$RESTART_LOG"
	echo "$now" > "$STATE_DIR/cooldown"
}

restart_radio() {
	radio=$1
	sta_guess=$2

	if too_many_restarts; then
		logger -t "$TAG" "skip $radio: more than $MAX_RESTARTS_PER_HOUR restarts in 1h"
		return 1
	fi

	logger -t "$TAG" "restarting $radio (5 GHz AP missing after firmware crash)"
	ip link del "$sta_guess" 2>/dev/null
	wifi down "$radio"
	sleep 2
	wifi up "$radio"
	record_restart
}

check_radio() {
	radio=$1
	expect_if=$2
	sta_guess=$3
	miss_file="$STATE_DIR/${radio}.miss"

	radio_enabled "$radio" || {
		rm -f "$miss_file"
		return 0
	}

	ifname=$(ubus call network.wireless status 2>/dev/null | jsonfilter -e "@.${radio}.interfaces[0].ifname")
	[ -n "$ifname" ] || ifname=$expect_if

	if iface_is_ap "$ifname" || iface_is_ap "$expect_if"; then
		rm -f "$miss_file"
		return 0
	fi

	miss=$(cat "$miss_file" 2>/dev/null || echo 0)
	miss=$((miss + 1))
	echo "$miss" > "$miss_file"
	logger -t "$TAG" "$radio AP down ($ifname missing), miss=$miss/$MISS_NEEDED"

	if [ "$miss" -ge "$MISS_NEEDED" ]; then
		restart_radio "$radio" "$sta_guess"
		rm -f "$miss_file"
	fi
}

check_radio radio0 phy0-ap0 wlan0
check_radio radio2 phy2-ap0 wlan1