src/functions/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 routes
  28
  29         local zones=$(zones_get_nonlocal)
  30         if [ -z "${zones}" ]; then
  31                 zones=$(zones_get_local)
  32         fi
  33
  34         local gateway
  35         local proto
  36         local weight
  37         local zone
  38         local cmd
  39
  40         for proto in ${IP_SUPPORTED_PROTOCOLS}; do
  41                 # Clear routes
  42                 routes=""
  43
  44                 cmd="ip $([ "${proto}" = "ipv6" ] && echo "-6") route"
  45
  46                 for zone in ${zones}; do
  47                         # Skip if zone is not up
  48                         routing_db_exists ${zone} ${proto} || continue
  49
  50                         if [ "$(routing_db_get ${zone} ${proto} active)" = "1" ]; then
  51                                 gateway=$(routing_db_get ${zone} ${proto} remote-ip-address)
  52
  53                                 # Go on if the device is not there anymore.
  54                                 device_exists ${zone} || continue
  55
  56                                 # On other devices, we will use the gateway if we got one.
  57                                 if isset gateway; then
  58                                         routes="${routes} nexthop via ${gateway}"
  59
  60                                 # If we have got a Point-to-Point device, we will directly send all
  61                                 # packets into the pipe.
  62                                 elif device_is_ptp ${zone}; then
  63                                         routes="${routes} dev ${zone}"
  64
  65                                 # If none of the cases above apply, we cannot go on.
  66                                 else
  67                                         continue
  68                                 fi
  69
  70                                 # Apply weight.
  71                                 weight=$(routing_db_get ${zone} ${proto} weight)
  72                                 if isinteger ${weight}; then
  73                                         routes="${routes} weight ${weight}"
  74                                 fi
  75                         else
  76                                 log DEBUG "Ignoring zone '${zone}' which is not active."
  77                         fi
  78                 done
  79
  80                 # Remove too much spaces.
  81                 routes=$(echo ${routes})
  82
  83                 # Remove all default routes.
  84                 while ${cmd} | grep -q "^default"; do
  85                         ${cmd} del default
  86                 done
  87
  88                 if [ -z "${routes}" ]; then
  89                         log INFO "Removed default route for ${proto}."
  90                         return ${EXIT_OK}
  91                 fi
  92
  93                 log INFO "Setting default route for ${proto}: ${routes}"
  94
  95                 cmd ${cmd} add default ${routes}
  96                 assert [ $? -eq 0 ]
  97
  98                 case "${proto}" in
  99                         ipv6)
 100                                 # Apply radvd configuration.
 101                                 radvd_update
 102                                 ;;
 103                 esac
 104         done
 105 }
 106
 107 # XXX deprecated function
 108 function routing_table_exists() {
 109         route_table_exists $@
 110 }
 111
 112 # XXX deprecated function
 113 function routing_table_create() {
 114         route_table_create $@
 115 }
 116
 117 function routing_db_path() {
 118         local zone=${1}
 119         local proto=${2}
 120
 121         assert isset zone
 122         assert isset proto
 123         assert isoneof proto ${IP_SUPPORTED_PROTOCOLS}
 124
 125         echo "${ROUTING_DB_DIR}/${zone}/${proto}"
 126 }
 127
 128 function routing_db_exists() {
 129         [ -d "$(routing_db_path $@)" ]
 130 }
 131
 132 function routing_db_create() {
 133         routing_db_exists $@ && return ${EXIT_OK}
 134
 135         mkdir -p $(routing_db_path $@)
 136 }
 137
 138 function routing_db_remove() {
 139         rm -rf $(routing_db_path $@)
 140 }
 141
 142 function routing_db_set() {
 143         local zone=${1}
 144         local proto=${2}
 145         local parameter=${3}
 146         shift 3
 147
 148         local value="$@"
 149
 150         log INFO "Updating database (${zone} - ${proto}): ${parameter} = ${value}"
 151
 152         routing_db_create ${zone} ${proto}
 153
 154         echo "${value}" > $(routing_db_path ${zone} ${proto})/${parameter}
 155 }
 156
 157 function routing_db_get() {
 158         local zone=${1}
 159         local proto=${2}
 160         local parameter=${3}
 161         shift 3
 162
 163         cat $(routing_db_path ${zone} ${proto})/${parameter} 2>/dev/null
 164 }
 165
 166 function routing_db_from_ppp() {
 167         local zone=${1}
 168         local proto=${2}
 169
 170         assert isset zone
 171         assert isset proto
 172
 173         # Save ppp configuration
 174         routing_db_set ${zone} ${proto} type "ppp"
 175
 176         if [ "${proto}" = "ipv6" ]; then
 177                 routing_db_set ${zone} ${proto} local-ip-address ${PPP_LLLOCAL}
 178                 routing_db_set ${zone} ${proto} remote-ip-address ${PPP_LLREMOTE}
 179         elif [ "${proto}" = "ipv4" ]; then
 180                 routing_db_set ${zone} ${proto} local-ip-address ${PPP_IPLOCAL}
 181                 routing_db_set ${zone} ${proto} remote-ip-address ${PPP_IPREMOTE}
 182         fi
 183
 184         routing_db_set ${zone} ${proto} dns ${PPP_DNS1} ${PPP_DNS2}
 185
 186         routing_db_set ${zone} ${proto} remote-address ${PPP_MACREMOTE,,}
 187 }
 188
 189 function routing_update() {
 190         local zone=${1}
 191         assert isset zone
 192
 193         # Nothing to do for local zones.
 194         if zone_is_local ${zone}; then
 195                 return ${EXIT_OK}
 196         fi
 197
 198         local proto=${2}
 199         local table=${zone}
 200         assert isset proto
 201
 202         local ip_cmd="ip"
 203         if [ "${proto}" = "ipv6" ]; then
 204                 ip_cmd="${ip_cmd} -6"
 205         fi
 206
 207         # Create routing table if not exists
 208         routing_table_create ${table}
 209
 210         log DEBUG "Flushing routing table ${table}"
 211         cmd ${ip_cmd} route flush table ${table}
 212
 213         # Exit here if there is no routing information.
 214         if ! routing_db_exists ${zone} ${proto}; then
 215                 return ${EXIT_OK}
 216         fi
 217
 218         local local_ip_address=$(routing_db_get ${zone} ${proto} local-ip-address)
 219         local remote_ip_address=$(routing_db_get ${zone} ${proto} remote-ip-address)
 220
 221         case "${proto}" in
 222                 ipv4)
 223                         local net_address=$(ipv4_get_netaddress ${local_ip_address})
 224
 225                         log DEBUG "Adding route for subnet ${local_ip_address} to table ${table}"
 226                         cmd ${ip_cmd} route add table ${table} ${net_address} dev ${zone}
 227                         ;;
 228         esac
 229
 230         log DEBUG "Adding default route for table ${table}"
 231         local routing_cmd="${ip_cmd} route add table ${table} default"
 232         if isset remote_ip_address; then
 233                 routing_cmd="${routing_cmd} via ${remote_ip_address}"
 234         else
 235                 routing_cmd="${routing_cmd} dev ${zone}"
 236         fi
 237         cmd ${routing_cmd}
 238
 239         cmd ${ip_cmd} rule add from ${local_ip_address} lookup ${table}
 240 }