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Commit | Line | Data |
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aba5acdf SH |
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 $peer" | |
88 | else | |
58bb642f SH |
89 | if [ "$ipaddr" = "" ]; then |
90 | echo "Missing IP address argument." 1>&2 | |
91 | exit 1 | |
92 | fi | |
aba5acdf SH |
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 | ||
ae665a52 | 132 | ip route add unreachable 224.0.0.0/24 >& /dev/null |
aba5acdf SH |
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 |