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                                 # If we have got a Point-to-Point device, we will directly send all
  57                                 # packets into the pipe.
  58                                 if device_is_ptp ${zone}; then
  59                                         routes="${routes} nexthop dev ${zone}"
  60
  61                                 # On other devices, we will use the gateway if we got one.
  62                                 elif isset gateway; then
  63                                         routes="${routes} nexthop via ${gateway}"
  64
  65                                 # If none of the cases above apply, we cannot go on.
  66                                 else
  67                                         continue
  68                                 fi
  69
  70                                 # Apply weight.
  71                                 weight=$(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 function routing_table_exists() {
 108         local zone=${1}
 109
 110         grep -q "${zone}$" < /etc/iproute2/rt_tables
 111 }
 112
 113 function routing_table_create() {
 114         local zone=${1}
 115
 116         if routing_table_exists ${zone}; then
 117                 return ${EXIT_OK}
 118         fi
 119
 120         log INFO "Creating routing table for zone '${zone}'"
 121
 122         local id=$(( ${zone#${ZONE_NONLOCAL}} + 1 ))
 123
 124         echo "${id}     ${zone}" >> /etc/iproute2/rt_tables
 125 }
 126
 127 function routing_table_remove() {
 128         : # XXX do we need this?
 129 }
 130
 131 function routing_db_path() {
 132         local zone=${1}
 133         local proto=${2}
 134
 135         assert isset zone
 136         assert isset proto
 137         assert isoneof proto ${IP_SUPPORTED_PROTOCOLS}
 138
 139         echo "${ROUTING_DB_DIR}/${zone}/${proto}"
 140 }
 141
 142 function routing_db_exists() {
 143         [ -d "$(routing_db_path $@)" ]
 144 }
 145
 146 function routing_db_create() {
 147         routing_db_exists $@ && return ${EXIT_OK}
 148
 149         mkdir -p $(routing_db_path $@)
 150 }
 151
 152 function routing_db_remove() {
 153         rm -rf $(routing_db_path $@)
 154 }
 155
 156 function routing_db_set() {
 157         local zone=${1}
 158         local proto=${2}
 159         local parameter=${3}
 160         shift 3
 161
 162         local value="$@"
 163
 164         log INFO "Updating database (${zone} - ${proto}): ${parameter} = ${value}"
 165
 166         routing_db_create ${zone} ${proto}
 167
 168         echo "${value}" > $(routing_db_path ${zone} ${proto})/${parameter}
 169 }
 170
 171 function routing_db_get() {
 172         local zone=${1}
 173         local proto=${2}
 174         local parameter=${3}
 175         shift 3
 176
 177         cat $(routing_db_path ${zone} ${proto})/${parameter} 2>/dev/null
 178 }
 179
 180 function routing_db_from_ppp() {
 181         local zone=${1}
 182         local proto=${2}
 183
 184         assert isset zone
 185         assert isset proto
 186
 187         # Save ppp configuration
 188         routing_db_set ${zone} ${proto} type "ppp"
 189
 190         if [ "${proto}" = "ipv6" ]; then
 191                 routing_db_set ${zone} ${proto} local-ip-address ${PPP_LLLOCAL}
 192                 routing_db_set ${zone} ${proto} remote-ip-address ${PPP_LLREMOTE}
 193         elif [ "${proto}" = "ipv4" ]; then
 194                 routing_db_set ${zone} ${proto} local-ip-address ${PPP_IPLOCAL}
 195                 routing_db_set ${zone} ${proto} remote-ip-address ${PPP_IPREMOTE}
 196         fi
 197
 198         routing_db_set ${zone} ${proto} dns ${PPP_DNS1} ${PPP_DNS2}
 199
 200         routing_db_set ${zone} ${proto} remote-address ${PPP_MACREMOTE,,}
 201 }
 202
 203 function routing_update() {
 204         local zone=${1}
 205         assert isset zone
 206
 207         # Nothing to do for local zones.
 208         if zone_is_local ${zone}; then
 209                 return ${EXIT_OK}
 210         fi
 211
 212         local proto=${2}
 213         local table=${zone}
 214         assert isset proto
 215
 216         local ip_cmd="ip"
 217         if [ "${proto}" = "ipv6" ]; then
 218                 ip_cmd="${ip_cmd} -6"
 219         fi
 220
 221         # Create routing table if not exists
 222         routing_table_create ${table}
 223
 224         log DEBUG "Flushing routing table ${table}"
 225         cmd ${ip_cmd} route flush table ${table}
 226
 227         # Exit here if there is no routing information.
 228         if ! routing_db_exists ${zone} ${proto}; then
 229                 return ${EXIT_OK}
 230         fi
 231
 232         local local_ip_address=$(routing_db_get ${zone} ${proto} local-ip-address)
 233         local remote_ip_address=$(routing_db_get ${zone} ${proto} remote-ip-address)
 234
 235         case "${proto}" in
 236                 ipv4)
 237                         local net_address=$(ipv4_get_netaddress ${local_ip_address})
 238
 239                         log DEBUG "Adding route for subnet ${local_ip_address} to table ${table}"
 240                         cmd ${ip_cmd} route add table ${table} ${net_address} dev ${zone}
 241                         ;;
 242         esac
 243
 244         log DEBUG "Adding default route for table ${table}"
 245         local routing_cmd="${ip_cmd} route add table ${table} default"
 246         if isset remote_ip_address; then
 247                 routing_cmd="${routing_cmd} via ${remote_ip_address}"
 248         else
 249                 routing_cmd="${routing_cmd} dev ${zone}"
 250         fi
 251         cmd ${routing_cmd}
 252
 253         cmd ${ip_cmd} rule add from ${local_ip_address} lookup ${table}
 254 }