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142 lines
3.2 KiB
142 lines
3.2 KiB
#
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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, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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} 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} 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 addr flush ${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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brctl addbr ${bridge}
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brctl stp ${bridge} off
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brctl setfd ${bridge} 0
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# Setting these to zero stops guest<->LAN traffic
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# traversing the bridge from hitting the *tables
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# rulesets. guest<->host traffic still gets processed
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# by the host's iptables rules so this isn't a hole
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sysctl -q -w "net.bridge.bridge-nf-call-arptables=0"
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sysctl -q -w "net.bridge.bridge-nf-call-ip6tables=0"
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sysctl -q -w "net.bridge.bridge-nf-call-iptables=0"
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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} up || true
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return
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fi
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brctl addif ${bridge} ${dev}
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ip link set ${dev} up
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}
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