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#============================================================================
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# Script for configuring a vif in routed-nat mode.
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# The hotplugging system will call this script if it is specified either in
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# the device configuration given to Xend, or the default Xend configuration
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# in /etc/xen/xend-config.sxp. If the script is specified in neither of those
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# places, then vif-bridge is the default.
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# vif-nat (add|remove|online|offline)
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# vif vif interface name (required).
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# XENBUS_PATH path to this device's details in the XenStore (required).
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# dhcp Whether to alter the local DHCP configuration to include this
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# new host (default no).
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# Read from the store:
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# ip list of IP networks for the vif, space-separated (default given in
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#============================================================================
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. "$dir/vif-common.sh"
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# turn on dhcp feature by default if dhcpd is installed
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if [ -f /etc/dhcpd.conf ]
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if [ "$dhcp" != 'no' ]
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dhcpd_conf_file=$(find_dhcpd_conf_file)
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dhcpd_init_file=$(find_dhcpd_init_file)
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dhcpd_arg_file=$(find_dhcpd_arg_file)
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if [ -z "$dhcpd_conf_file" ] || [ -z "$dhcpd_init_file" ] || [ -z "$dhcpd_arg_file" ]
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echo 'Failed to find dhcpd configuration or init or args file.' >&2
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domid=$(xenstore_read "$XENBUS_PATH/frontend-id")
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vifid=$(xenstore_read "$XENBUS_PATH/handle")
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vifid=$(( $vifid + 1 ))
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local domid1=$(( $domid / 256 ))
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local domid2=$(( $domid % 256 ))
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echo "10.$domid1.$domid2.$vifid/16"
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echo $(echo $1 | awk -F. '{print $1"."$2"."$3"."$4 + 127}')
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$(( ($1 & 0xFF000000) >> 24))\
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.$(( ($1 & 0x00FF0000) >> 16))\
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.$(( ($1 & 0x0000FF00) >> 8 ))\
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.$(( $1 & 0x000000FF ))
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router_ip=$(routing_ip "$ip")
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# Split the given IP/bits pair.
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vif_ip=`echo ${ip} | awk -F/ '{print $1}'`
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hostname=$(xenstore_read "$XENBUS_PATH/domain" | tr -- '_.:/+' '-----')
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if [ "$vifid" != "1" ]
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hostname="$hostname-$vifid"
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dhcparg_remove_entry()
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local tmpfile=$(mktemp)
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sed -e "s/$vif //" "$dhcpd_arg_file" >"$tmpfile"
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if diff "$tmpfile" "$dhcpd_arg_file" >/dev/null
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mv "$tmpfile" "$dhcpd_arg_file"
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local tmpfile=$(mktemp)
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# handle Red Hat, SUSE, and Debian styles, with or without quotes
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sed -e 's/^DHCPDARGS="*\([^"]*\)"*/DHCPDARGS="\1'"$vif "'"/' \
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"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
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sed -e 's/^DHCPD_INTERFACE="*\([^"]*\)"*/DHCPD_INTERFACE="\1'"$vif "'"/' \
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"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
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sed -e 's/^INTERFACES="*\([^"]*\)"*/INTERFACES="\1'"$vif "'"/' \
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"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
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local tmpfile=$(mktemp)
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grep -v "host $hostname" "$dhcpd_conf_file" >"$tmpfile"
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if diff "$tmpfile" "$dhcpd_conf_file" >/dev/null
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mv "$tmpfile" "$dhcpd_conf_file"
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claim_lock "vif-nat-dhcp"
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mac=$(xenstore_read "$XENBUS_PATH/mac")
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echo >>"$dhcpd_conf_file" \
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"host $hostname { hardware ethernet $mac; fixed-address $vif_ip; option routers $router_ip; option host-name \"$hostname\"; }"
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release_lock "vif-nat-dhcp"
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"$dhcpd_init_file" restart || true
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claim_lock "vif-nat-dhcp"
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release_lock "vif-nat-dhcp"
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"$dhcpd_init_file" restart || true # We need to ignore failure because
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# ISC dhcpd 3 borks if there is nothing
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# for it to do, which is the case if
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# the outgoing interface is not
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# configured to offer leases and there
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if ip route | grep -q "dev $vif"
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log debug "$vif already up"
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do_or_die ip link set "$vif" up arp on
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do_or_die ip addr add "$router_ip" dev "$vif"
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do_or_die ip route add "$vif_ip" dev "$vif" src "$router_ip"
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echo 1 >/proc/sys/net/ipv4/conf/${vif}/proxy_arp
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[ "$dhcp" != 'no' ] && dhcp_up
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[ "$dhcp" != 'no' ] && dhcp_down
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do_without_error ifconfig "$vif" down
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log debug "Successful vif-nat $command for $vif."
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if [ "$command" = "online" ]
added
removed
tools/examples/vif-nat
