functions.routing

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2010  Michael Tremer & Christian Schmidt                      #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 function routing_has_default() {
  23         ip route | grep -q "^default"
  24 }
  25
  26 function routing_default_update() {
  27         local zone
  28         local routes
  29
  30         local gateway
  31         local weight
  32
  33         log INFO "Updating default route."
  34
  35         for zone in $(zones_get_nonlocal); do
  36                 # Skip if zone is not up
  37                 red_db_exists ${zone} || continue
  38
  39                 if [ "$(red_db_get ${zone} active)" = "1" ]; then
  40                         gateway=$(red_db_get ${zone} remote-ip-address)
  41                         weight=$(red_db_get ${zone} weight)
  42
  43                         routes="${routes} nexthop via ${gateway}"
  44
  45                         if [ -n "${weight}" ]; then
  46                                 routes="${routes} weight ${weight}"
  47                         fi
  48                 else
  49                         log DEBUG "Ignoring zone '${zone}' which is not active."
  50                 fi
  51         done
  52
  53         if [ -z "${routes}" ]; then
  54                 if routing_has_default; then
  55                         ip route del default
  56                 fi
  57                 return ${EXIT_OK}
  58         fi
  59
  60         ip route replace default ${routes}
  61 }
  62
  63 function routing_table_exists() {
  64         local zone=${1}
  65
  66         grep -q "${zone}$" < /etc/iproute2/rt_tables
  67 }
  68
  69 function routing_table_create() {
  70         local zone=${1}
  71
  72         if ! zone_is_nonlocal ${zone}; then
  73                 error_log "Can only create routing tables for non-local zones."
  74                 return ${EXIT_ERROR}
  75         fi
  76
  77         if routing_table_exists ${zone}; then
  78                 return ${EXIT_OK}
  79         fi
  80
  81         log INFO "Creating routing table for zone '${zone}'"
  82
  83         local id=$(( ${zone#red} + 1 ))
  84
  85         echo "${id}     ${zone}" >> /etc/iproute2/rt_tables
  86 }
  87
  88 function routing_table_remove() {
  89         : # XXX do we need this?
  90 }