Synnefo » snf-ganeti

#!/bin/bash

#

# Copyright (C) 2011, 2012, 2013 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

@SHELL_ENV_INIT@

readonly GANETI_TAP="gnt.com"

function check {

  if [ -z "$INTERFACE" ]; then

    echo "No network interface specified"

    exit 1

  fi

  if [ -z "$MODE" ]; then

    echo "MODE not specified"

    exit 1

  fi

}

function is_instance_communication_tap {

  COMMUNICATION=$(echo "$INTERFACE" | cut -d "." -f 1-2)

  if [ "$MODE" = "routed" -a "$COMMUNICATION" = "$GANETI_TAP" ]

  then

    return 0

  else

    return 1

  fi

}

function fix_mac {

  # Fix the autogenerated MAC to have the first octet set to "fe"

  # to discourage the bridge from using the TAP dev's MAC

  FIXED_MAC=$(ip link show $INTERFACE | \

    awk '{if ($1 == "link/ether") printf("fe%s",substr($2,3,15))}')

  # in case of a vif (xen_netback device) this action is not allowed

  ip link set $INTERFACE address $FIXED_MAC || true

}

function setup_bridge {

  if [ "$MODE" = "bridged" ]; then

    fix_mac

    ip link set $INTERFACE up

    ip link set $INTERFACE mtu $(</sys/class/net/${LINK}/mtu)

    # Connect the interface to the bridge

    brctl addif $LINK $INTERFACE

  fi

}

function setup_ovs {

  if [ "$MODE" = "openvswitch" ]; then

    ovs-vsctl add-port ${LINK} $INTERFACE

  fi

}

function setup_route {

  if [ "$MODE" = "routed" ]; then

    ip link set $INTERFACE up

    if [ -z "$IP" ]; then

      echo "Routed NIC but no IP address specified"

      exit 1

    fi

    # Route traffic targeted at the IP to the interface

    if [ -n "$LINK" ]; then

      while ip rule del dev $INTERFACE; do :; done

      ip rule add dev $INTERFACE table $LINK

      ip route replace $IP table $LINK proto static dev $INTERFACE

    else

      ip route replace $IP proto static dev $INTERFACE

    fi

    # Allow routing and arp proxying, or ndp proxying (IPv6)

    if [ -d "/proc/sys/net/ipv4/conf/$INTERFACE" ]; then

      echo 1 > /proc/sys/net/ipv4/conf/$INTERFACE/proxy_arp

      echo 1 > /proc/sys/net/ipv4/conf/$INTERFACE/forwarding

    fi

    if [ -d "/proc/sys/net/ipv6/conf/$INTERFACE" ]; then

      echo 1 > /proc/sys/net/ipv6/conf/$INTERFACE/proxy_ndp

      echo 1 > /proc/sys/net/ipv6/conf/$INTERFACE/forwarding

    fi

  fi

}