functions.radvd

   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 RADVD_CONFIGFILE="/etc/radvd.conf"
  23
  24 function radvd_update() {
  25         # (Re-)write the configuration file
  26         radvd_write_config
  27
  28         # Reload the radvd service.
  29         service_reload radvd
  30 }
  31
  32 function radvd_write_config() {
  33         config_header "radv daemon configuration file" > ${RADVD_CONFIGFILE}
  34
  35         # Write the configuration for all zones.
  36         local zone
  37         for zone in $(zones_get_local); do
  38                 __radvd_config_interface ${zone}
  39
  40         done >> ${RADVD_CONFIGFILE}
  41
  42         return ${EXIT_OK}
  43 }
  44
  45 function __radvd_config_interface() {
  46         local zone=${1}
  47         assert isset zone
  48
  49         log DEBUG "Writing radvd configuration for ${zone}."
  50
  51         # If the interface does not provide any routing information,
  52         # we can skip this whole stuff.
  53         if ! routing_db_exists ${zone} ipv6; then
  54                 return ${EXIT_OK}
  55         fi
  56
  57         # Skip if zone is not active.
  58         local active=$(routing_db_get ${zone} ipv6 active)
  59         [ "${active}" = "0" ] && return ${EXIT_OK}
  60
  61         # Skip if there is no prefix or prefix is link-local.
  62         local addr=$(routing_db_get ${zone} ipv6 local-ip-address)
  63         if [ -z "${addr}" ] || [ "${addr:0:5}" = "fe80:" ]; then
  64                 return ${EXIT_OK}
  65         fi
  66         local prefix=$(ipv6_get_network ${addr})
  67
  68         # Check if the subnet is configured by the DHCP server.
  69         local dhcpd="false"
  70         if dhcpd_subnet_match ipv6 "${prefix}"; then
  71                 dhcpd="true"
  72         fi
  73
  74         print "interface ${zone} {"
  75         print " AdvSendAdvert on;"
  76         print " MinRtrAdvInterval 3;"
  77         print " MaxRtrAdvInterval 10;"
  78         print " IgnoreIfMissing on;"
  79
  80         if enabled dhcpd; then
  81                 print " AdvManagedFlag on;"
  82                 print " AdvOtherConfigFlag on;"
  83         fi
  84
  85         print
  86         print " prefix ${prefix} {"
  87         print "         AdvOnLink on;"
  88
  89         if enabled dhcpd; then
  90                 print "         AdvRouterAddr off;"
  91                 print "         AdvAutonomous off;"
  92         else
  93                 print "         AdvRouterAddr on;"
  94                 print "         AdvAutonomous on;"
  95         fi
  96
  97         print " };"
  98         print
  99
 100         # Add the DNS configuration.
 101         __radvd_config_dns ${zone}
 102
 103         print "};"
 104         print
 105 }
 106
 107 function __radvd_config_dns() {
 108         local zone=${1}
 109
 110         # Do nothing, when this option is not enabled.
 111         enabled DNS_ADVERTISE_SERVERS || return ${EXIT_OK}
 112
 113         # XXX it is kind of difficult to announce our local
 114         # resolver.
 115
 116         local server servers
 117         for server in $(dns_server_list_sorted); do
 118                 # Filter out non IPv6 addresses.
 119                 ipv6_is_valid ${server} || continue
 120
 121                 servers="${servers} ${server}"
 122         done
 123
 124         # Remove whitespaces.
 125         servers=$(echo ${servers})
 126
 127         # If there are no servers to announce, we stop right here.
 128         if ! isset servers; then
 129                 log DEBUG "No servers to announce."
 130                 return ${EXIT_OK}
 131         fi
 132
 133         print " RDNSS ${servers} {"
 134         print "         # Use the defaults here."
 135         print " };"
 136         print
 137 }