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338 lines
8.3 KiB
338 lines
8.3 KiB
#!/bin/bash
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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 ${XEN_CONFIG_DIR}/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 ${netdev}), adds a device
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# (defaults to the device on the default gateway route) to it, copies
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# the IP addresses from the device to the bridge and adjusts the routes
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# 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-bridge (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 ${netdev}).
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# netdev The interface to add to the bridge (default gateway device).
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# antispoof Whether to use iptables to prevent spoofing (default no).
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#
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# Internal Vars:
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# pdev="p${netdev}"
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# tdev=tmpbridge
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#
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# start:
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# Creates the bridge as tdev
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# Copies the IP and MAC addresses from pdev to bridge
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# Renames netdev to be pdev
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# Renames tdev to bridge
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# Enslaves pdev to bridge
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#
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# stop:
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# Removes pdev from the bridge
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# Transfers addresses, routes from bridge to pdev
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# Renames bridge to tdev
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# Renames pdev to netdev
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# Deletes tdev
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#
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# status:
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# Print addresses, interfaces, routes
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#
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#============================================================================
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dir=$(dirname "$0")
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. "$dir/logging.sh"
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. "$dir/xen-script-common.sh"
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. "$dir/xen-network-common.sh"
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. "$dir/locking.sh"
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findCommand "$@"
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evalVariables "$@"
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is_network_root () {
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local rootfs=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $3; }}' /etc/mtab)
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local rootopts=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $4; }}' /etc/mtab)
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[[ "$rootfs" =~ "^nfs" ]] || [[ "$rootopts" =~ "_netdev" ]] && has_nfsroot=1 || has_nfsroot=0
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if [ $has_nfsroot -eq 1 ]; then
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local bparms=$(cat /proc/cmdline)
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for p in $bparms; do
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local ipaddr=$(echo $p | awk /nfsroot=/'{ print substr($1,9,index($1,":")-9) }')
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if [ "$ipaddr" != "" ]; then
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local nfsdev=$(ip route get $ipaddr | awk /$ipaddr/'{ print $3 }')
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[[ "$nfsdev" == "$netdev" ]] && return 0 || return 1
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fi
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done
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fi
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return 1
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}
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find_alt_device () {
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local interf=$1
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local prefix=${interf%[[:digit:]]}
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local ifs=$(ip link show | grep " $prefix" |\
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awk '{ printf ("%s",substr($2,1,length($2)-1)) }' |\
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sed s/$interf//)
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echo "$ifs"
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}
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netdev=${netdev:-$(ip route list 0.0.0.0/0 | \
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sed 's/.*dev \([a-z]\+[0-9]\+\).*$/\1/')}
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if is_network_root ; then
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altdevs=$(find_alt_device $netdev)
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for netdev in $altdevs; do break; done
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if [ -z "$netdev" ]; then
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[ -x /usr/bin/logger ] && /usr/bin/logger "network-bridge: bridging not supported on network root; not starting"
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exit
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fi
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fi
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netdev=${netdev:-eth0}
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bridge=${bridge:-${netdev}}
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antispoof=${antispoof:-no}
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pdev="p${netdev}"
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tdev=tmpbridge
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get_ip_info() {
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addr_pfx=`ip addr show dev $1 | egrep '^ *inet' | sed -e 's/ *inet //' -e 's/ .*//'`
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gateway=`ip route show dev $1 | fgrep default | sed 's/default via //'`
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}
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do_ifup() {
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if [ $1 != "${netdev}" ] || ! ifup $1 ; then
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if [ -n "$addr_pfx" ] ; then
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# use the info from get_ip_info()
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ip addr flush $1
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ip addr add ${addr_pfx} dev $1
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fi
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ip link set dev $1 up
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[ -n "$gateway" ] && ip route add default via ${gateway}
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fi
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}
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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} label ${dst}/
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s/secondary//
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" | sh -e
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# Remove automatic routes on destination 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: 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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##
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# link_exists interface
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#
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# Returns 0 if the interface named exists (whether up or down), 1 otherwise.
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#
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link_exists()
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{
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if ip link show "$1" >/dev/null 2>/dev/null
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then
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return 0
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else
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return 1
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fi
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}
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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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iptables -P FORWARD DROP
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iptables -F FORWARD
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iptables -A FORWARD -m physdev --physdev-in ${pdev} -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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ip addr show ${dev}
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ip addr show ${bridge}
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echo ' '
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brctl show ${bridge}
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echo ' '
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ip route list
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echo ' '
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route -n
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echo '============================================================'
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}
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op_start () {
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if [ "${bridge}" = "null" ] ; then
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return
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fi
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if [ `brctl show | wc -l` != 1 ]; then
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return
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fi
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if link_exists "$pdev"; then
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# The device is already up.
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return
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fi
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claim_lock "network-bridge"
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create_bridge ${tdev}
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preiftransfer ${netdev}
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transfer_addrs ${netdev} ${tdev}
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# Remember slaves for bonding interface.
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if [ -e /sys/class/net/${netdev}/bonding/slaves ]; then
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slaves=`cat /sys/class/net/${netdev}/bonding/slaves`
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fi
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# Remember the IP details for do_ifup.
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get_ip_info ${netdev}
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if ! ifdown ${netdev}; then
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ip link set ${netdev} down
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ip addr flush ${netdev}
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fi
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ip link set ${netdev} name ${pdev}
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ip link set ${tdev} name ${bridge}
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setup_physical_bridge_port ${pdev}
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# Restore slaves
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if [ -n "${slaves}" ]; then
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ip link set ${pdev} up
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ifenslave ${pdev} ${slaves}
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fi
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add_to_bridge2 ${bridge} ${pdev}
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do_ifup ${bridge}
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if [ ${antispoof} = 'yes' ] ; then
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antispoofing
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fi
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release_lock "network-bridge"
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}
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op_stop () {
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if [ "${bridge}" = "null" ]; then
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return
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fi
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if ! link_exists "$bridge"; then
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return
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fi
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if ! [ -e "/sys/class/net/${bridge}/brif/${pdev}" ]; then
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# $bridge is not a bridge to which pdev is enslaved
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return
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fi
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claim_lock "network-bridge"
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transfer_addrs ${bridge} ${pdev}
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if ! ifdown ${bridge}; then
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get_ip_info ${bridge}
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fi
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ip link set ${pdev} down
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ip addr flush ${bridge}
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brctl delif ${bridge} ${pdev}
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ip link set ${bridge} down
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ip link set ${bridge} name ${tdev}
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ip link set ${pdev} name ${netdev}
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do_ifup ${netdev}
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brctl delbr ${tdev}
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release_lock "network-bridge"
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}
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# adds $dev to $bridge but waits for $dev to be in running state first
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add_to_bridge2() {
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local bridge=$1
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local dev=$2
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local maxtries=10
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echo -n "Waiting for ${dev} to negotiate link."
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ip link set ${dev} up
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for i in `seq ${maxtries}` ; do
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if ifconfig ${dev} | grep -q RUNNING ; then
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break
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else
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echo -n '.'
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sleep 1
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fi
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done
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if [ ${i} -eq ${maxtries} ] ; then echo -n '(link isnt in running state)' ; fi
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echo
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add_to_bridge ${bridge} ${dev}
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}
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case "$command" 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: $command" >&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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