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#!/bin/bash
#
# Maxim Krasnyansky <max_mk@yahoo.com>
# $Id: reroute,v 1.3.2.1 2007/06/29 05:27:18 mtbishop Exp $
#
IP=/sbin/ip
if [ $# -ne 3 ]; then
echo "Usage: reroute option Source_IP Destination_IP"
echo "Options:"
echo " -m - Move route Source_IP -> Destination_IP to table 100."
echo " Configure source based routing."
echo " -r - Restore route Source_IP -> Destination_IP to default table."
echo " Delete source based routing."
exit 1;
fi
MODE=$1
IP_S=$2
IP_D=$3
# Get original route
ROUTE=`$IP route get $IP_D from $IP_S | grep dev`
# Parse route
set - $ROUTE
while [ "$1" != "" ]; do
if [ "$1" = "src" ]; then
shift
O_SRC=$1
fi
if [ "$1" = "dev" ]; then
shift
O_DEV=$1
fi
if [ "$1" = "via" ]; then
shift
O_GW=$1
fi
shift
done
# Flush all routes, rules and cache for that IP
$IP route flush $IP_D table all >/dev/null 2>&1
$IP rule del from $IP_S to $IP_D >/dev/null 2>&1
case $MODE in
-m)
# Add route via orig device to table 100
$IP route add $ROUTE table 100 >/dev/null 2>&1
# Add source based routing
$IP rule add from $IP_S to $IP_D table 100 >/dev/null 2>&1
;;
-r)
# Add route via orig device to defaul table
$IP route add $ROUTE >/dev/null 2>&1
;;
esac
exit 0
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