openwrt/package/base-files/files/etc/init.d/sysctl

#!/bin/sh /etc/rc.common
# Copyright (C) 2006 OpenWrt.org

START=11

apply_defaults() {
	local mem="$(awk '/^MemTotal:/ {print $2}' /proc/meminfo)"
	local min_free frag_low_thresh frag_high_thresh

	if [ "$mem" -gt 65536 ]; then # 128M
		min_free=16384
	elif [ "$mem" -gt 32768 ]; then # 64M
		min_free=8192
	else
		min_free=1024
		frag_low_thresh=393216
		frag_high_thresh=524288
	fi

	sysctl -qw vm.min_free_kbytes="$min_free"

	[ "$frag_low_thresh" ] && sysctl -qw \
		net.ipv4.ipfrag_low_thresh="$frag_low_thresh" \
		net.ipv4.ipfrag_high_thresh="$frag_high_thresh" \
		net.ipv6.ip6frag_low_thresh="$frag_low_thresh" \
		net.ipv6.ip6frag_high_thresh="$frag_high_thresh" \
		net.netfilter.nf_conntrack_frag6_low_thresh="$frag_low_thresh" \
		net.netfilter.nf_conntrack_frag6_high_thresh="$frag_high_thresh"

	# first set default, then all interfaces to avoid races with appearing interfaces
	if [ -d /proc/sys/net/ipv6/conf ]; then
		echo 0 > /proc/sys/net/ipv6/conf/default/accept_ra
		for iface in /proc/sys/net/ipv6/conf/*/accept_ra; do
			echo 0 > "$iface"
		done
	fi
}

start() {
	apply_defaults
	for CONF in /etc/sysctl.d/*.conf /etc/sysctl.conf; do
		[ -f "$CONF" ] && sysctl -e -p "$CONF" >&-
	done
}