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
  31         if ! device_exists ${device}; then
  32                 log WARN "Could not attach '${device}' to '${bridge}' becase device does not exist."
  33                 return ${EXIT_ERROR}
  34         fi
  35
  36         # If device is already attached, exit silently
  37         if listmatch ${device} $(bridge_get_members ${bridge}); then
  38                 return ${EXIT_OK}
  39         fi
  40
  41         log INFO "Attaching device '${device}' to bridge '${bridge}'."
  42
  43         brctl addif ${bridge} ${device}
  44 }
  45
  46 function bridge_detach_device() {
  47         local bridge=${1}
  48         local device=${2}
  49
  50         assert isset bridge
  51         assert isset device
  52
  53         if ! device_exists ${bridge}; then
  54                 error "Bridge '${bridge}' does not exist."
  55                 return ${EXIT_ERROR}
  56         fi
  57
  58         if ! device_exists ${device}; then
  59                 return ${EXIT_OK}
  60         fi
  61
  62         # If device is not attached, exit silently
  63         if ! listmatch ${device} $(bridge_get_members ${bridge}); then
  64                 return ${EXIT_OK}
  65         fi
  66
  67         log INFO "Detaching device '${device}' from bridge '${bridge}'."
  68
  69         brctl delif ${bridge} ${device}
  70 }
  71
  72 function bridge_get_members() {
  73         local bridge=${1}
  74
  75         assert isset bridge
  76
  77         local member
  78         for member in ${SYS_CLASS_NET}/${bridge}/brif/*; do
  79                 member=$(basename ${member})
  80                 if device_exists ${member}; then
  81                         echo "${member}"
  82                 fi
  83         done
  84 }
  85
  86 function bridge_is_forwarding() {
  87         local seconds=45
  88         local zone=${1}
  89
  90         bridge_has_carrier ${zone} || return ${EXIT_ERROR}
  91
  92         local device
  93         while [ ${seconds} -gt 0 ]; do
  94                 for device in ${SYS_CLASS_NET}/${zone}/brif/*; do
  95                         [ -e "${device}/state" ] || continue
  96                         if [ "$(<${device}/state)" = "3" ]; then
  97                                 return ${EXIT_OK}
  98                         fi
  99                 done
 100                 sleep 1
 101                 seconds=$((${seconds} - 1))
 102         done
 103
 104         return ${EXIT_ERROR}
 105 }
 106
 107 function bridge_has_carrier() {
 108         local zone=${1}
 109
 110         local has_carrier=${EXIT_ERROR}
 111
 112         local device
 113         for device in ${SYS_CLASS_NET}/${zone}/brif/*; do
 114                 device=$(basename ${device})
 115                 device_exists ${device} || continue
 116
 117                 device_has_carrier ${device} && has_carrier=${EXIT_OK}
 118         done
 119
 120         return ${has_carrier}
 121 }