* automatically set route tables for each ether device with iproute2

 * this script should be used with /etc/network/interfaces on Ubuntu(Debian)
   * it maybe work on RHEL(CentOS) with some restrictions

git-svn-id: https://lab.mitty.jp/svn/lab/trunk@5 7d2118f6-f56c-43e7-95a2-4bb3031d96e7

diff --git a/iproute/setroute.sh b/iproute/setroute.sh
new file mode 100644 (file)
index 0000000..e88bdc6
--- /dev/null
+++ b/iproute/setroute.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+set -x
+
+IF="${1:?"usage: $0 <ether_device> [gateway] "}"
+GATEWAY=$2
+
+TID=`/sbin/ip addr show dev ${IF} | grep -w ${IF}: | cut -d : -f 1`
+
+if [ "${GATEWAY}" = "down" ]; then
+    # delete routing table and policy and exit
+    ## routing table is automatically flushed, so 'route flush' can be removed
+    /sbin/ip route flush table ${TID}
+    ## device has no longer any IP addr, so do not use IPADDR
+    /sbin/ip rule del table ${TID} priority ${TID}
+    /sbin/ip route flush cache
+    echo "remove routing table and policy for ${IF}"
+    exit
+fi
+
+
+# get IP address, network mask, default gateway info
+IPADDR=`/sbin/ip addr show dev ${IF} | grep -w inet | cut -d t -f 2 | cut -d ' ' -f 2 | cut -d / -f 1`
+NETWORK=`/sbin/ip route show dev ${IF} | grep -w ${IPADDR} | cut -d ' ' -f 1`
+
+if [ -z "${GATEWAY}" ]; then
+    GATEWAY=`/sbin/ip route show dev ${IF} | grep -w default | cut -d ' ' -f 3`
+fi
+if [ -z "${GATEWAY}" ]; then
+    GATEWAY=`/sbin/ip route | grep -w default | cut -d ' ' -f 3`
+    # this may add wrong default route especially on RHEL
+fi
+
+
+# set routing table
+/sbin/ip route add ${NETWORK} dev ${IF} table ${TID}
+/sbin/ip route add default via ${GATEWAY} dev ${IF} table ${TID}
+
+# set routing policy
+/sbin/ip rule add from ${IPADDR} table ${TID} priority ${TID}
+
+/sbin/ip route flush cache
+echo "add routing table and policy for ${IF} on table ${TID}"