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109 lines
2.9 KiB
109 lines
2.9 KiB
#!/bin/bash
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#============================================================================
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# ${XEN_SCRIPT_DIR}/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 ${XEN_CONFIG_DIR}/xend-config.sxp. If the script is specified in
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# neither of those places, then this script is the default.
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#
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# Usage:
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# vif-bridge (add|remove|online|offline)
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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 "$bridge" ]
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then
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fatal "Could not find bridge, and none was specified"
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fi
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else
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#
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# Old style bridge setup with netloop, used to have a bridge name
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# of xenbrX, enslaving pethX and vif0.X, and then configuring
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# eth0.
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#
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# New style bridge setup does not use netloop, so the bridge name
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# is ethX and the physical device is enslaved pethX
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#
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# So if...
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#
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# - User asks for xenbrX
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# - AND xenbrX doesn't exist
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# - AND there is a ethX device which is a bridge
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#
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# ..then we translate xenbrX to ethX
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#
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# This lets old config files work without modification
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#
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if [ ! -e "/sys/class/net/$bridge" ] && [ -z "${bridge##xenbr*}" ]
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then
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if [ -e "/sys/class/net/eth${bridge#xenbr}/bridge" ]
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then
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bridge="eth${bridge#xenbr}"
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fi
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fi
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fi
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RET=0
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ip link show $bridge 1>/dev/null 2>&1 || RET=1
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if [ "$RET" -eq 1 ]
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then
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fatal "Could not find bridge device $bridge"
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fi
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case "$command" in
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online)
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setup_virtual_bridge_port "$dev"
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mtu="`ip link show $bridge | awk '/mtu/ { print $5 }'`"
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if [ -n "$mtu" ] && [ "$mtu" -gt 0 ]
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then
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ip link set $dev mtu $mtu || :
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fi
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add_to_bridge "$bridge" "$dev"
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;;
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offline)
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do_without_error brctl delif "$bridge" "$dev"
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do_without_error ifconfig "$dev" down
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;;
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add)
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setup_virtual_bridge_port "$dev"
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add_to_bridge "$bridge" "$dev"
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;;
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esac
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log debug "Successful vif-bridge $command for $dev, bridge $bridge."
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if [ "$type_if" = vif -a "$command" = "online" ]
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then
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success
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fi
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