functions.bridge

   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 bridge_attach_device() {
  23         local bridge=${1}
  24         local device=${2}
  25
  26         assert isset bridge
  27         assert isset device
  28
  29         assert device_exists ${bridge}
  30         assert device_exists ${device}
  31
  32         # If device is already attached, exit silently
  33         if listmatch ${device} $(bridge_get_members ${bridge}); then
  34                 return ${EXIT_OK}
  35         fi
  36
  37         log INFO "Attaching device '${device}' to bridge '${bridge}'."
  38
  39         brctl addif ${bridge} ${device}
  40 }
  41
  42 function bridge_detach_device() {
  43         local bridge=${1}
  44         local device=${2}
  45
  46         assert isset bridge
  47         assert isset device
  48
  49         if ! device_exists ${bridge}; then
  50                 error "Bridge '${bridge}' does not exist."
  51                 return ${EXIT_ERROR}
  52         fi
  53
  54         if ! device_exists ${device}; then
  55                 return ${EXIT_OK}
  56         fi
  57
  58         # If device is not attached, exit silently
  59         if ! listmatch ${device} $(bridge_get_members ${bridge}); then
  60                 return ${EXIT_OK}
  61         fi
  62
  63         log INFO "Detaching device '${device}' from bridge '${bridge}'."
  64
  65         brctl delif ${bridge} ${device}
  66 }
  67
  68 function bridge_get_members() {
  69         local bridge=${1}
  70
  71         assert isset bridge
  72
  73         local member
  74         for member in ${SYS_CLASS_NET}/${bridge}/brif/*; do
  75                 member=$(basename ${member})
  76                 if device_exists ${member}; then
  77                         echo "${member}"
  78                 fi
  79         done
  80 }
  81
  82 function bridge_is_forwarding() {
  83         local seconds=45
  84         local zone=${1}
  85
  86         bridge_has_carrier ${zone} || return ${EXIT_ERROR}
  87
  88         local device
  89         while [ ${seconds} -gt 0 ]; do
  90                 for device in ${SYS_CLASS_NET}/${zone}/brif/*; do
  91                         [ -e "${device}/state" ] || continue
  92                         if [ "$(<${device}/state)" = "3" ]; then
  93                                 return ${EXIT_OK}
  94                         fi
  95                 done
  96                 sleep 1
  97                 seconds=$((${seconds} - 1))
  98         done
  99
 100         return ${EXIT_ERROR}
 101 }
 102
 103 function bridge_has_carrier() {
 104         local zone=${1}
 105
 106         local has_carrier=${EXIT_ERROR}
 107
 108         local device
 109         for device in ${SYS_CLASS_NET}/${zone}/brif/*; do
 110                 device=$(basename ${device})
 111                 device_exists ${device} || continue
 112
 113                 device_has_carrier ${device} && has_carrier=${EXIT_OK}
 114         done
 115
 116         return ${has_carrier}
 117 }