/etc/xen/scripts/vif-bridge is in xen-utils-common 4.1.4-3+deb7u9.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | #!/bin/bash
#============================================================================
# ${XEN_SCRIPT_DIR}/vif-bridge
#
# Script for configuring a vif in bridged mode.
# The hotplugging system will call this script if it is specified either in
# the device configuration given to Xend, or the default Xend configuration
# in ${XEN_CONFIG_DIR}/xend-config.sxp. If the script is specified in
# neither of those places, then this script is the default.
#
# Usage:
# vif-bridge (add|remove|online|offline)
#
# Environment vars:
# vif vif interface name (required).
# XENBUS_PATH path to this device's details in the XenStore (required).
#
# Read from the store:
# bridge bridge to add the vif to (optional). Defaults to searching for the
# bridge itself.
# ip list of IP networks for the vif, space-separated (optional).
#
# up:
# Enslaves the vif interface to the bridge and adds iptables rules
# for its ip addresses (if any).
#
# down:
# Removes the vif interface from the bridge and removes the iptables
# rules for its ip addresses (if any).
#============================================================================
dir=$(dirname "$0")
. "$dir/vif-common.sh"
bridge=${bridge:-}
bridge=$(xenstore_read_default "$XENBUS_PATH/bridge" "$bridge")
if [ -z "$bridge" ]
then
bridge=$(brctl show | cut -d "
" -f 2 | cut -f 1)
if [ -z "$bridge" ]
then
fatal "Could not find bridge, and none was specified"
fi
else
#
# Old style bridge setup with netloop, used to have a bridge name
# of xenbrX, enslaving pethX and vif0.X, and then configuring
# eth0.
#
# New style bridge setup does not use netloop, so the bridge name
# is ethX and the physical device is enslaved pethX
#
# So if...
#
# - User asks for xenbrX
# - AND xenbrX doesn't exist
# - AND there is a ethX device which is a bridge
#
# ..then we translate xenbrX to ethX
#
# This lets old config files work without modification
#
if [ ! -e "/sys/class/net/$bridge" ] && [ -z "${bridge##xenbr*}" ]
then
if [ -e "/sys/class/net/eth${bridge#xenbr}/bridge" ]
then
bridge="eth${bridge#xenbr}"
fi
fi
fi
RET=0
ip link show $bridge 1>/dev/null 2>&1 || RET=1
if [ "$RET" -eq 1 ]
then
fatal "Could not find bridge device $bridge"
fi
case "$command" in
online)
setup_virtual_bridge_port "$dev"
mtu="`ip link show $bridge | awk '/mtu/ { print $5 }'`"
if [ -n "$mtu" ] && [ "$mtu" -gt 0 ]
then
ip link set $dev mtu $mtu || :
fi
add_to_bridge "$bridge" "$dev"
;;
offline)
do_without_error brctl delif "$bridge" "$dev"
do_without_error ifconfig "$dev" down
;;
add)
setup_virtual_bridge_port "$dev"
add_to_bridge "$bridge" "$dev"
;;
esac
if [ "$type_if" = vif ]; then
handle_iptable
fi
log debug "Successful vif-bridge $command for $dev, bridge $bridge."
if [ "$type_if" = vif -a "$command" = "online" ]
then
success
fi
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