ia64/xen-unstable

view tools/examples/vif-common.sh @ 8325:e6d71c99c84d

Squelch error message from iptables (we log this later if necessary).

Signed-off-by: Ewan Mellor <ewan@xensource.com>
author emellor@leeni.uk.xensource.com
date Mon Dec 12 16:44:27 2005 +0000 (2005-12-12)
parents e64e28e36e02
children 95f84e37c90d
line source
1 #
2 # Copyright (c) 2005 XenSource Ltd.
3 #
4 # This library is free software; you can redistribute it and/or
5 # modify it under the terms of version 2.1 of the GNU Lesser General Public
6 # License as published by the Free Software Foundation.
7 #
8 # This library is distributed in the hope that it will be useful,
9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 # Lesser General Public License for more details.
12 #
13 # You should have received a copy of the GNU Lesser General Public
14 # License along with this library; if not, write to the Free Software
15 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 #
19 dir=$(dirname "$0")
20 . "$dir/xen-hotplug-common.sh"
21 . "$dir/xen-network-common.sh"
23 findCommand "$@"
25 if [ "$command" != "online" ] &&
26 [ "$command" != "offline" ] &&
27 [ "$command" != "add" ] &&
28 [ "$command" != "remove" ]
29 then
30 log err "Invalid command: $command"
31 exit 1
32 fi
34 case "$command" in
35 add | remove)
36 exit 0
37 ;;
38 esac
41 # Parameters may be read from the environment, the command line arguments, and
42 # the store, with overriding in that order. The environment is given by the
43 # driver, the command line is given by the Xend global configuration, and
44 # store details are given by the per-domain or per-device configuration.
46 evalVariables "$@"
48 ip=${ip:-}
49 ip=$(xenstore_read_default "$XENBUS_PATH/ip" "$ip")
51 # Check presence of compulsory args.
52 XENBUS_PATH="${XENBUS_PATH:?}"
53 vif="${vif:?}"
56 function frob_iptable()
57 {
58 if [ "$command" == "online" ]
59 then
60 local c="-A"
61 else
62 local c="-D"
63 fi
65 iptables "$c" FORWARD -m physdev --physdev-in "$vif" "$@" -j ACCEPT \
66 2>/dev/null ||
67 [ "$c" == "-D" ] ||
68 log err \
69 "iptables $c FORWARD -m physdev --physdev-in $vif $@ -j ACCEPT failed.
70 If you are using iptables, this may affect networking for guest domains."
71 }
74 ##
75 # Add or remove the appropriate entries in the iptables. With antispoofing
76 # turned on, we have to explicitly allow packets to the interface, regardless
77 # of the ip setting. If ip is set, then we additionally restrict the packets
78 # to those coming from the specified networks, though we allow DHCP requests
79 # as well.
80 #
81 function handle_iptable()
82 {
83 # Check for a working iptables installation. Checking for the iptables
84 # binary is not sufficient, because the user may not have the appropriate
85 # modules installed. If iptables is not working, then there's no need to do
86 # anything with it, so we can just return.
87 if ! iptables -L -n >&/dev/null
88 then
89 return
90 fi
92 if [ "$ip" != "" ]
93 then
94 local addr
95 for addr in "$ip"
96 do
97 frob_iptable -s "$addr"
98 done
100 # Always allow the domain to talk to a DHCP server.
101 frob_iptable -p udp --sport 68 --dport 67
102 else
103 # No IP addresses have been specified, so allow anything.
104 frob_iptable
105 fi
106 }
109 ##
110 # ip_of interface
111 #
112 # Print the IP address currently in use at the given interface, or nothing if
113 # the interface is not up.
114 #
115 function ip_of()
116 {
117 ip addr show "$1" | awk "/^.*inet.*$1\$/{print \$2}" | sed 's,/.*,,'
118 }
121 ##
122 # dom0_ip
123 #
124 # Print the IP address of the interface in dom0 through which we are routing.
125 # This is the IP address on the interface specified as "netdev" as a parameter
126 # to these scripts, or eth0 by default. This function will call fatal if no
127 # such interface could be found.
128 #
129 function dom0_ip()
130 {
131 local nd=${netdev:-eth0}
132 local result=$(ip_of "$nd")
133 if [ -z "$result" ]
134 then
135 fatal
136 "$netdev is not up. Bring it up or specify another interface with " \
137 "netdev=<if> as a parameter to $0."
138 fi
139 echo "$result"
140 }