osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 1 | #! /bin/bash |
| 2 | |
| 3 | CheckForwarding () { |
| 4 | local sbase fwd |
| 5 | sbase=/proc/sys/net/ipv4/conf |
| 6 | fwd=0 |
| 7 | if [ -d $sbase ]; then |
| 8 | for dir in $sbase/*/forwarding; do |
| 9 | fwd=$[$fwd + `cat $dir`] |
| 10 | done |
| 11 | else |
| 12 | fwd=2 |
| 13 | fi |
| 14 | return $fwd |
| 15 | } |
| 16 | |
| 17 | RestartRDISC () { |
| 18 | killall -HUP rdisc || rdisc -fs |
| 19 | } |
| 20 | |
| 21 | ABCMaskLen () { |
| 22 | local class; |
| 23 | |
| 24 | class=${1%%.*} |
| 25 | if [ "$1" = "" -o $class -eq 0 -o $class -ge 224 ]; then return 0 |
| 26 | elif [ $class -ge 224 ]; then return 0 |
| 27 | elif [ $class -ge 192 ]; then return 24 |
| 28 | elif [ $class -ge 128 ]; then return 16 |
| 29 | else return 8; fi |
| 30 | } |
| 31 | |
| 32 | label="label $1" |
| 33 | ldev="$1" |
| 34 | dev=${1%:*} |
| 35 | if [ "$dev" = "" -o "$1" = "help" ]; then |
| 36 | echo "Usage: ifcfg DEV [[add|del [ADDR[/LEN]] [PEER] | stop]" 1>&2 |
| 37 | echo " add - add new address" 1>&2 |
| 38 | echo " del - delete address" 1>&2 |
| 39 | echo " stop - completely disable IP" 1>&2 |
| 40 | exit 1 |
| 41 | fi |
| 42 | shift |
| 43 | |
| 44 | CheckForwarding |
| 45 | fwd=$? |
| 46 | if [ $fwd -ne 0 ]; then |
| 47 | echo "Forwarding is ON or its state is unknown ($fwd). OK, No RDISC." 1>&2 |
| 48 | fi |
| 49 | |
| 50 | |
| 51 | deleting=0 |
| 52 | case "$1" in |
| 53 | add) shift ;; |
| 54 | stop) |
| 55 | if [ "$ldev" != "$dev" ]; then |
| 56 | echo "Cannot stop alias $ldev" 1>&2 |
| 57 | exit 1; |
| 58 | fi |
| 59 | ip -4 addr flush dev $dev $label || exit 1 |
| 60 | if [ $fwd -eq 0 ]; then RestartRDISC; fi |
| 61 | exit 0 ;; |
| 62 | del*) |
| 63 | deleting=1; shift ;; |
| 64 | *) |
| 65 | esac |
| 66 | |
| 67 | ipaddr= |
| 68 | pfxlen= |
| 69 | if [ "$1" != "" ]; then |
| 70 | ipaddr=${1%/*} |
| 71 | if [ "$1" != "$ipaddr" ]; then |
| 72 | pfxlen=${1#*/} |
| 73 | fi |
| 74 | if [ "$ipaddr" = "" ]; then |
| 75 | echo "$1 is bad IP address." 1>&2 |
| 76 | exit 1 |
| 77 | fi |
| 78 | fi |
| 79 | shift |
| 80 | |
| 81 | peer=$1 |
| 82 | if [ "$peer" != "" ]; then |
| 83 | if [ "$pfxlen" != "" -a "$pfxlen" != "32" ]; then |
| 84 | echo "Peer address with non-trivial netmask." 1>&2 |
| 85 | exit 1 |
| 86 | fi |
| 87 | pfx="$ipaddr peer $peer" |
| 88 | else |
Stephen Hemminger | 58bb642 | 2006-05-09 10:56:53 -0700 | [diff] [blame] | 89 | if [ "$ipaddr" = "" ]; then |
| 90 | echo "Missing IP address argument." 1>&2 |
| 91 | exit 1 |
| 92 | fi |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 93 | if [ "$pfxlen" = "" ]; then |
| 94 | ABCMaskLen $ipaddr |
| 95 | pfxlen=$? |
| 96 | fi |
| 97 | pfx="$ipaddr/$pfxlen" |
| 98 | fi |
| 99 | |
| 100 | if [ "$ldev" = "$dev" -a "$ipaddr" != "" ]; then |
| 101 | label= |
| 102 | fi |
| 103 | |
| 104 | if [ $deleting -ne 0 ]; then |
| 105 | ip addr del $pfx dev $dev $label || exit 1 |
| 106 | if [ $fwd -eq 0 ]; then RestartRDISC; fi |
| 107 | exit 0 |
| 108 | fi |
| 109 | |
| 110 | |
| 111 | if ! ip link set up dev $dev ; then |
| 112 | echo "Error: cannot enable interface $dev." 1>&2 |
| 113 | exit 1 |
| 114 | fi |
| 115 | if [ "$ipaddr" = "" ]; then exit 0; fi |
| 116 | |
| 117 | if ! arping -q -c 2 -w 3 -D -I $dev $ipaddr ; then |
| 118 | echo "Error: some host already uses address $ipaddr on $dev." 1>&2 |
| 119 | exit 1 |
| 120 | fi |
| 121 | |
| 122 | if ! ip address add $pfx brd + dev $dev $label; then |
| 123 | echo "Error: failed to add $pfx on $dev." 1>&2 |
| 124 | exit 1 |
| 125 | fi |
| 126 | |
| 127 | arping -q -A -c 1 -I $dev $ipaddr |
| 128 | noarp=$? |
| 129 | ( sleep 2 ; |
| 130 | arping -q -U -c 1 -I $dev $ipaddr ) >& /dev/null </dev/null & |
| 131 | |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 132 | ip route add unreachable 224.0.0.0/24 >& /dev/null |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 133 | ip route add unreachable 255.255.255.255 >& /dev/null |
| 134 | if [ `ip link ls $dev | grep -c MULTICAST` -ge 1 ]; then |
| 135 | ip route add 224.0.0.0/4 dev $dev scope global >& /dev/null |
| 136 | fi |
| 137 | |
| 138 | if [ $fwd -eq 0 ]; then |
| 139 | if [ $noarp -eq 0 ]; then |
| 140 | ip ro append default dev $dev metric 30000 scope global |
| 141 | elif [ "$peer" != "" ]; then |
| 142 | if ping -q -c 2 -w 4 $peer ; then |
| 143 | ip ro append default via $peer dev $dev metric 30001 |
| 144 | fi |
| 145 | fi |
| 146 | RestartRDISC |
| 147 | fi |
| 148 | |
| 149 | exit 0 |