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#!/bin/bash
#
# Module: vyatta-update-arp-params
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2009 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Mohit Mehta
# Date: February 2009
# Description: Update [ARP (IPv4)|Neighbor (IPV6)] Parameters
#
# **** End License ****
#
#
# subroutines
#
print_usage()
{
echo "Usage:"
echo -e "\t$0 syntax-check <type of arp paramter> <value of arp paramter> <ipv4/ipv6>"
echo -e "\t$0 update <type of arp paramter> <value of arp paramter> <ipv4/ipv6>"
echo -e "\t$0 delete <type of arp paramter> <ipv4/ipv6>"
}
set_table_thresholds() {
local ip_type=$1
local arp_value=$2
local softmax=$((arp_value / 2));
local min=$((arp_value / 8));
sudo sysctl -q net.$ip_type.neigh.default.gc_thresh3=$arp_value
sudo sysctl -q net.$ip_type.neigh.default.gc_thresh2=$softmax
sudo sysctl -q net.$ip_type.neigh.default.gc_thresh1=$min
}
syntax_arp_param ()
{
local arp_type=$1
local arp_value=$2
local ip_type=$3
case "$arp_type" in
table-size)
local allowed_values=(1024 2048 4096 8192 16384 32768)
local i
for i in ${allowed_values[@]}; do
if [[ "$i" == "$arp_value" ]]; then
exit 0
fi
done
echo "Allowed values for ARP table-size - ${allowed_values[*]}"
exit 1
;;
*)
echo Invalid arp parameter $arp_type to set
exit 1
;;
esac
}
update_arp_param ()
{
local arp_type=$1
local arp_value=$2
local ip_type=$3
case "$arp_type" in
table-size)
set_table_thresholds $ip_type $arp_value
;;
*)
echo Invalid arp parameter $arp_type to update
;;
esac
}
#
# main
#
case "$1" in
syntax-check)
if [ $# -ne 4 ]; then
print_usage
exit 1
fi
syntax_arp_param $2 $3 $4
;;
update)
if [ $# -ne 4 ]; then
print_usage
exit 1
fi
update_arp_param $2 $3 $4
;;
*)
print_usage
exit 1
;;
esac
exit 0
# end of file
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