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iap10@freefall.cl.cam.ac.uk
141ec0c639
Although Li Ge has had problems with this script he had trouble with the previous too. I think this new one should work for more people, particularly those using DHCP on their primary dom0 interface.
Debugging is currently enabled ("sh -x") so a log of the script's execution is output to /var/log/xend.log
Signed-off-by: ian@xensource.com
--HG--
rename : tools/examples/network => tools/examples/network-bridge
261 lines
6.9 KiB
Bash
Executable File
261 lines
6.9 KiB
Bash
Executable File
#!/bin/sh -x
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#============================================================================
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# Default Xen network start/stop script.
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# Xend calls a network script when it starts.
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# The script name to use is defined in /etc/xen/xend-config.sxp
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# in the network-script field.
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#
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# This script creates a bridge (default xen-br0), adds a device
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# (default eth0) to it, copies the IP addresses from the device
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# to the bridge and adjusts the routes accordingly.
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#
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# If all goes well, this should ensure that networking stays up.
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# However, some configurations are upset by this, especially
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# NFS roots. If the bridged setup does not meet your needs,
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# configure a different script, for example using routing instead.
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#
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# Usage:
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#
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# network (start|stop|status) {VAR=VAL}*
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#
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# Vars:
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#
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# bridge The bridge to use (default xen-br0).
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# netdev The interface to add to the bridge (default eth0).
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# antispoof Whether to use iptables to prevent spoofing (default yes).
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#
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# start:
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# Creates the bridge and enslaves netdev to it.
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# Copies the IP addresses from netdev to the bridge.
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# Deletes the routes to netdev and adds them on bridge.
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#
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# stop:
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# Removes netdev from the bridge.
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# Deletes the routes to bridge and adds them to netdev.
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#
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# status:
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# Print ifconfig for netdev and bridge.
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# Print routes.
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#
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#============================================================================
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# Exit if anything goes wrong.
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set -e
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# First arg is the operation.
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OP=$1
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shift
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# Pull variables in args in to environment.
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for arg ; do export "${arg}" ; done
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bridge=${bridge:-xen-br0}
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netdev=${netdev:-eth0}
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antispoof=${antispoof:-yes}
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echo "*network $OP bridge=$bridge netdev=$netdev antispoof=$antispoof" >&2
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# Usage: transfer_addrs src dst
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# Copy all IP addresses (including aliases) from device $src to device $dst.
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transfer_addrs () {
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local src=$1
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local dst=$2
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# Don't bother if $dst already has IP addresses.
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if ip addr show dev ${dst} | egrep -q '^ *inet ' ; then
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return
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fi
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# Address lines start with 'inet' and have the device in them.
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# Replace 'inet' with 'ip addr add' and change the device name $src
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# to 'dev $src'.
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ip addr show dev ${src} | egrep '^ *inet ' | sed -e "
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s/inet/ip addr add/
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s@\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+/[0-9]\+\)@\1@
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s/${src}/dev ${dst}/
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" | sh -e
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# Remove automatic routes on destionation device
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ip route list | sed -ne "
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/dev ${dst}\( \|$\)/ {
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s/^/ip route del /
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p
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}" | sh -e
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}
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# Usage: del_addrs src
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del_addrs () {
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local src=$1
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ip addr show dev ${src} | egrep '^ *inet ' | sed -e "
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s/inet/ip addr del/
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s@\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\)/[0-9]\+@\1@
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s/${src}/dev ${src}/
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" | sh -e
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}
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# Usage: transfer_routes src dst
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# Get all IP routes to device $src, delete them, and
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# add the same routes to device $dst.
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# The original routes have to be deleted, otherwise adding them
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# for $dst fails (duplicate routes).
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transfer_routes () {
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local src=$1
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local dst=$2
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# List all routes and grep the ones with $src in.
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# Stick 'ip route del' on the front to delete.
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# Change $src to $dst and use 'ip route add' to add.
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ip route list | sed -ne "
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/dev ${src}\( \|$\)/ {
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h
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s/^/ip route del /
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P
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g
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s/${src}/${dst}/
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s/^/ip route add /
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P
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d
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}" | sh -e
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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 ! brctl show | grep -q ${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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fi
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ifconfig ${bridge} up
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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 ! brctl show | grep -q ${dev} ; then
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brctl addif ${bridge} ${dev}
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fi
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}
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# Usage: antispoofing dev bridge
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# Set the default forwarding policy for $dev to drop.
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# Allow forwarding to the bridge.
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antispoofing () {
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local dev=$1
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local bridge=$2
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iptables -P FORWARD DROP
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iptables -A FORWARD -m physdev --physdev-in ${dev} -j ACCEPT
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}
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# Usage: show_status dev bridge
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# Print ifconfig and routes.
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show_status () {
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local dev=$1
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local bridge=$2
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echo '============================================================'
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ifconfig ${dev}
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ifconfig ${bridge}
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echo ' '
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ip route list
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echo ' '
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route -n
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echo '============================================================'
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}
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op_start () {
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if [ "${bridge}" == "null" ] ; then
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return
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fi
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create_bridge ${bridge}
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if ifconfig 2>/dev/null | grep -q veth0 ; then
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return
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fi
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if ifconfig veth0 2>/dev/null | grep -q veth0 ; then
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mac=`ifconfig ${netdev} | grep HWadd | sed -e 's/.*\(..:..:..:..:..:..\).*/\1/'`
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if ! ifdown ${netdev} ; then
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# if ifup didn't work, see if we have an ip= on cmd line
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if egrep 'ip=[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:' /proc/cmdline ;
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then
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kip=`sed -e 's!.*ip=\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\):.*!\1!' /proc/cmdline`
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kmask=`sed -e 's!.*ip=[^:]*:[^:]*:[^:]*:\([^:]*\):.*!\1!' /proc/cmdline`
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kgate=`sed -e 's!.*ip=[^:]*:[^:]*:\([^:]*\):.*!\1!' /proc/cmdline`
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ifconfig ${netdev} 0.0.0.0 down
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fi
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fi
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ip link set ${netdev} name p${netdev}
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ip link set veth0 name eth0
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ifconfig p${netdev} -arp down
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ifconfig p${netdev} hw ether fe:ff:ff:ff:ff:ff
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ifconfig ${netdev} hw ether ${mac}
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add_to_bridge ${bridge} vif0.0
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add_to_bridge ${bridge} p${netdev}
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ip link set vif0.0 up
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ip link set p${netdev} up
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if ! ifup ${netdev} ; then
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if [ ${kip} ] ; then
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# use the addresses we grocked from /proc/cmdline
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ifconfig ${netdev} ${kip}
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[ ${kmask} ] && ifconfig ${netdev} netmask ${kmask}
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ifconfig ${netdev} up
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[ ${kgate} ] && ip route add default via ${kgate}
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fi
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fi
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else
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# old style without veth0
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transfer_addrs ${netdev} ${bridge}
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transfer_routes ${netdev} ${bridge}
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fi
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if [ ${antispoof} == 'yes' ] ; then
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antispoofing ${netdev} ${bridge}
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fi
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}
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op_stop () {
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if [ "${bridge}" == "null" ] ; then
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return
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fi
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brctl delif ${bridge} ${netdev}
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if ifconfig veth0 2>/dev/null | grep -q veth0 ; then
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brctl delif ${bridge} vif0.0
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ifconfig vif0.0 down
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mac=`ifconfig veth0 | grep HWadd | sed -e 's/.*\(..:..:..:..:..:..\).*/\1/'`
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ifconfig ${netdev} down
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ifconfig ${netdev} hw ether ${mac}
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ifconfig ${netdev} arp up
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transfer_addrs veth0 ${netdev}
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transfer_routes veth0 ${netdev}
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del_addrs veth0
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ifconfig veth0 -arp down
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ifconfig veth0 hw ether 00:00:00:00:00:00
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else
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transfer_routes ${bridge} ${netdev}
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fi
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}
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case ${OP} in
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start)
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op_start
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;;
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stop)
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op_stop
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;;
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status)
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show_status ${netdev} ${bridge}
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;;
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*)
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echo 'Unknown command: ' ${OP} >&2
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echo 'Valid commands are: start, stop, status' >&2
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exit 1
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esac
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