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#
# Copyright (c) 2005 XenSource Ltd.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; If not, see <http://www.gnu.org/licenses/>.
#
# Gentoo doesn't have ifup/ifdown, so we define appropriate alternatives.
# Other platforms just use ifup / ifdown directly.
##
# preiftransfer
#
# @param $1 The current name for the physical device, which is also the name
# that the virtual device will take once the physical device has
# been renamed.
if ! which ifup >/dev/null 2>/dev/null
then
preiftransfer()
{
true
}
ifup()
{
false
}
ifdown()
{
false
}
else
preiftransfer()
{
true
}
fi
first_file()
{
t="$1"
shift
for file in $@
do
if [ "$t" "$file" ]
then
echo "$file"
return
fi
done
}
find_dhcpd_conf_file()
{
first_file -f /etc/dhcp/dhcpd.conf /etc/dhcp3/dhcpd.conf /etc/dhcpd.conf
}
find_dhcpd_init_file()
{
first_file -x /etc/init.d/{isc-dhcp-server,dhcp-server,dhcp3-server,dhcp,dhcpd}
}
find_dhcpd_arg_file()
{
first_file -f /etc/sysconfig/dhcpd /etc/defaults/dhcp /etc/default/dhcp-server /etc/default/dhcp3-server
}
# configure interfaces which act as pure bridge ports:
_setup_bridge_port() {
local dev="$1"
local virtual="$2"
# take interface down ...
ip link set dev ${dev} down
if [ $virtual -ne 0 ] ; then
# Initialise a dummy MAC address. We choose the numerically
# largest non-broadcast address to prevent the address getting
# stolen by an Ethernet bridge for STP purposes.
# (FE:FF:FF:FF:FF:FF)
ip link set dev ${dev} address fe:ff:ff:ff:ff:ff || true
fi
# ... and configure it
ip address flush dev ${dev}
}
setup_physical_bridge_port() {
_setup_bridge_port $1 0
}
setup_virtual_bridge_port() {
_setup_bridge_port $1 1
}
# Usage: create_bridge bridge
create_bridge () {
local bridge=$1
# Don't create the bridge if it already exists.
if [ ! -e "/sys/class/net/${bridge}/bridge" ]; then
if which brctl >&/dev/null; then
brctl addbr ${bridge}
brctl stp ${bridge} off
brctl setfd ${bridge} 0
else
ip link add name ${bridge} type bridge stp_state 0 forward_delay 0
fi
fi
}
# Usage: add_to_bridge bridge dev
add_to_bridge () {
local bridge=$1
local dev=$2
# Don't add $dev to $bridge if it's already on the bridge.
if [ ! -e "/sys/class/net/${bridge}/brif/${dev}" ]; then
log debug "adding $dev to bridge $bridge"
if which brctl >&/dev/null; then
brctl addif ${bridge} ${dev}
else
ip link set ${dev} master ${bridge}
fi
else
log debug "$dev already on bridge $bridge"
fi
ip link set dev ${dev} up
}
remove_from_bridge () {
local bridge=$1
local dev=$2
do_without_error ip link set dev ${dev} down
# Don't remove $dev from $bridge if it's not on the bridge.
if [ -e "/sys/class/net/${bridge}/brif/${dev}" ]; then
log debug "removing $dev from bridge $bridge"
if which brctl >&/dev/null; then
do_without_error brctl delif ${bridge} ${dev}
else
do_without_error ip link set ${dev} nomaster
fi
else
log debug "$dev not on bridge $bridge"
fi
}
# Usage: set_mtu bridge dev
set_mtu () {
local bridge=$1
local dev=$2
local type_if=$3
XENBUS_PATH="${XENBUS_PATH:?}"
local mtu=$(xenstore_read_default "$XENBUS_PATH/mtu" "")
if [ -z "$mtu" ]
then
mtu="`ip link show dev ${bridge}| awk '/mtu/ { print $5 }'`"
if [ -n "$mtu" ]
then
log debug "$bridge MTU is $mtu"
fi
fi
if [ -n "$mtu" ] && [ "$mtu" -gt 0 ]
then
log debug "setting $dev MTU to $mtu"
ip link set dev ${dev} mtu ${mtu} || :
if [ ${type_if} = vif ]
then
local dev_=${dev#vif}
local domid=${dev_%.*}
local devid=${dev_#*.}
local FRONTEND_PATH="/local/domain/$domid/device/vif/$devid"
xenstore_write "$FRONTEND_PATH/mtu" ${mtu}
fi
fi
}
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