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https://github.com/xen-project/xen.git
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Steven Haigh
0e7c69bd3c
Newer distros like CentOS 8 do not have brctl available. As such, we can't use it to configure networking anymore. This patch will fall back to 'ip' or 'bridge' commands if brctl is not available in the working PATH. This would be a likely backport candidate to any version expected to be built on CentOS 8 etc. Signed-off-by: Steven Haigh <netwiz@crc.id.au> Acked-by: Wei Liu <wl@xen.org>
152 lines
3.3 KiB
Bash
152 lines
3.3 KiB
Bash
#
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# Copyright (c) 2005 XenSource Ltd.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of version 2.1 of the GNU Lesser General Public
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# License as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; If not, see <http://www.gnu.org/licenses/>.
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#
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# Gentoo doesn't have ifup/ifdown, so we define appropriate alternatives.
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# Other platforms just use ifup / ifdown directly.
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##
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# preiftransfer
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#
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# @param $1 The current name for the physical device, which is also the name
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# that the virtual device will take once the physical device has
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# been renamed.
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if ! which ifup >/dev/null 2>/dev/null
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then
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preiftransfer()
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{
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true
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}
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ifup()
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{
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false
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}
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ifdown()
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{
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false
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}
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else
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preiftransfer()
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{
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true
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}
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fi
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first_file()
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{
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t="$1"
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shift
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for file in $@
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do
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if [ "$t" "$file" ]
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then
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echo "$file"
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return
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fi
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done
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}
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find_dhcpd_conf_file()
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{
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first_file -f /etc/dhcp3/dhcpd.conf /etc/dhcpd.conf
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}
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find_dhcpd_init_file()
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{
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first_file -x /etc/init.d/{dhcp3-server,dhcp,dhcpd}
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}
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find_dhcpd_arg_file()
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{
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first_file -f /etc/sysconfig/dhcpd /etc/defaults/dhcp /etc/default/dhcp3-server
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}
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# configure interfaces which act as pure bridge ports:
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_setup_bridge_port() {
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local dev="$1"
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local virtual="$2"
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# take interface down ...
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ip link set dev ${dev} down
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if [ $virtual -ne 0 ] ; then
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# Initialise a dummy MAC address. We choose the numerically
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# largest non-broadcast address to prevent the address getting
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# stolen by an Ethernet bridge for STP purposes.
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# (FE:FF:FF:FF:FF:FF)
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ip link set dev ${dev} address fe:ff:ff:ff:ff:ff || true
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fi
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# ... and configure it
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ip address flush dev ${dev}
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}
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setup_physical_bridge_port() {
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_setup_bridge_port $1 0
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}
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setup_virtual_bridge_port() {
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_setup_bridge_port $1 1
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}
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# Usage: create_bridge bridge
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create_bridge () {
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local bridge=$1
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# Don't create the bridge if it already exists.
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if [ ! -e "/sys/class/net/${bridge}/bridge" ]; then
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if which brctl >&/dev/null; then
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brctl addbr ${bridge}
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brctl stp ${bridge} off
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brctl setfd ${bridge} 0
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else
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ip link add name ${bridge} type bridge stp_state 0 forward_delay 0
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fi
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fi
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}
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# Usage: add_to_bridge bridge dev
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add_to_bridge () {
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local bridge=$1
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local dev=$2
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# Don't add $dev to $bridge if it's already on a bridge.
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if [ -e "/sys/class/net/${bridge}/brif/${dev}" ]; then
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ip link set dev ${dev} up || true
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return
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fi
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if which brctl >&/dev/null; then
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brctl addif ${bridge} ${dev}
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else
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ip link set ${dev} master ${bridge}
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fi
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ip link set dev ${dev} up
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}
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# Usage: set_mtu bridge dev
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set_mtu () {
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local bridge=$1
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local dev=$2
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mtu="`ip link show dev ${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 ${dev} mtu $mtu || :
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fi
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}
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