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emellor@leeni.uk.xensource.com
af374bc7d2
hotplug ones. Added evalVariables and findCommand functions to that, which we use to clarify the handling of variables being passed in as command line variables. Make vif-bridge able to find the bridge for itself if only one bridge is in use. This means that it is not necessary to specify a bridge in many configurations. Allow the bridge to be specified on the command line, meaning that a default may be provided in the xend-config.sxp if desired. Added xenstore_read_default to xen-hotplug-common.sh, which reads from the store but uses a given default if the path in the store is not present. This is used by vif-bridge to allow the store details (i.e. those given to xm create) to override the default value given in the xend-config.sxp. Remove vif-bridge setting -- the value can be specified on the vif-script command line if necessary. Added examples for network-nat/vif-nat. Added lots of big comments. Signed-off-by: Ewan Mellor <ewan@xensource.com>
71 lines
1.9 KiB
Bash
Executable File
71 lines
1.9 KiB
Bash
Executable File
#!/bin/sh
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#============================================================================
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# /etc/xen/vif-bridge
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#
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# Script for configuring a vif in bridged mode.
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# The hotplugging system will call this script if it is specified either in
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# the device configuration given to Xend, or the default Xend configuration
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# in /etc/xen/xend-config.sxp. If the script is specified in neither of those
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# places, then this script is the default.
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#
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# Usage:
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# vif-bridge (up|down)
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#
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# Environment vars:
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# vif vif interface name (required).
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# XENBUS_PATH path to this device's details in the XenStore (required).
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#
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# Read from the store:
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# bridge bridge to add the vif to (optional). Defaults to searching for the
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# bridge itself.
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# ip list of IP networks for the vif, space-separated (optional).
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#
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# up:
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# Enslaves the vif interface to the bridge and adds iptables rules
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# for its ip addresses (if any).
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#
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# down:
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# Removes the vif interface from the bridge and removes the iptables
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# rules for its ip addresses (if any).
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#============================================================================
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dir=$(dirname "$0")
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. "$dir/vif-common.sh"
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bridge=${bridge:-}
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bridge=$(xenstore_read_default "$XENBUS_PATH/bridge" "$bridge")
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if [ -z "$bridge" ]
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then
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bridge=$(brctl show | cut -d "
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" -f 2 | cut -f 1)
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if [ -z "$bridge" ]
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then
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fatal "Could not find bridge, and none was specified"
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fi
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fi
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case "$command" in
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up)
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if brctl show "$bridge" | grep "$vif" >&/dev/null
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then
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log debug "$vif already attached to $bridge"
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exit 0
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fi
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brctl addif "$bridge" "$vif" ||
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fatal "brctl addif $bridge $vif failed"
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ifconfig "$vif" up || fatal "ifconfig $vif up failed"
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;;
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down)
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# vifs are auto-removed from bridge.
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ifconfig "$vif" down || fatal "ifconfig $vif down failed"
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;;
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esac
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handle_iptable
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log debug "Successful vif-bridge operation for $vif, bridge $bridge."
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