| 1 | #!/bin/sh |
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| 2 | |
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| 3 | set -x |
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| 4 | |
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| 5 | IF="${1:?"usage: $0 <ether_device> [gateway] "}" |
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| 6 | GATEWAY=$2 |
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| 7 | |
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| 8 | TID=`/sbin/ip addr show dev ${IF} | grep -w ${IF}: | cut -d : -f 1` |
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| 9 | |
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| 10 | if [ "${GATEWAY}" = "down" ]; then |
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| 11 | # delete routing table and policy and exit |
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| 12 | ## routing table is automatically flushed, so 'route flush' can be removed |
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| 13 | /sbin/ip route flush table ${TID} |
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| 14 | ## device has no longer any IP addr, so do not use IPADDR |
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| 15 | /sbin/ip rule del table ${TID} priority ${TID} |
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| 16 | /sbin/ip route flush cache |
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| 17 | echo "remove routing table and policy for ${IF}" |
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| 18 | exit |
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| 19 | fi |
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| 20 | |
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| 21 | |
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| 22 | # get IP address, network mask, default gateway info |
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| 23 | IPADDR=`/sbin/ip addr show dev ${IF} | grep -w inet | cut -d t -f 2 | cut -d ' ' -f 2 | cut -d / -f 1` |
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| 24 | NETWORK=`/sbin/ip route show dev ${IF} | grep -w ${IPADDR} | cut -d ' ' -f 1` |
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| 25 | |
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| 26 | if [ -z "${GATEWAY}" ]; then |
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| 27 | GATEWAY=`/sbin/ip route show dev ${IF} | grep -w default | cut -d ' ' -f 3` |
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| 28 | fi |
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| 29 | if [ -z "${GATEWAY}" ]; then |
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| 30 | GATEWAY=`/sbin/ip route | grep -w default | cut -d ' ' -f 3` |
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| 31 | # this may add wrong default route especially on RHEL |
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| 32 | fi |
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| 33 | |
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| 34 | |
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| 35 | # set routing table |
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| 36 | /sbin/ip route add ${NETWORK} dev ${IF} table ${TID} |
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| 37 | /sbin/ip route add default via ${GATEWAY} dev ${IF} table ${TID} |
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| 38 | |
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| 39 | # set routing policy |
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| 40 | /sbin/ip rule add from ${IPADDR} table ${TID} priority ${TID} |
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| 41 | |
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| 42 | /sbin/ip route flush cache |
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| 43 | echo "add routing table and policy for ${IF} on table ${TID}" |
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