hooks/mtu

   1 #!/bin/sh
   2 ########################################################################
   3 # Begin $NETWORK_DEVICES/services/mtu
   4 #
   5 # Description : Sets MTU per interface
   6 #
   7 # Authors     : Nathan Coulson - nathan@linuxfromscratch.org
   8 #               Jim Gifford - jim@linuxfromscratch.org
   9 #
  10 # Version     : 00.00
  11 #
  12 # Notes       : This sets the maximum amount of bytes that can be
  13 #               transmitted within a packet. By default, this
  14 #               value is set to 1500.
  15 #
  16 ########################################################################
  17
  18 . /lib/network/hook-header
  19
  20 HOOK_NAME=mtu
  21 HOOK_TYPE=zone
  22
  23 DEFAULT_MTU=1500
  24
  25 function usage() {
  26         echo "Usage: ${0} {pre-up|post-up|pre-down|post-down|config} [interface]"
  27 }
  28
  29 case "${action}" in
  30         help)
  31                 ;;
  32
  33         info)
  34                 echo "HOOK_NAME=$HOOK_NAME"
  35                 echo "HOOK_TYPE=$HOOK_TYPE"
  36                 ;;
  37
  38         status)
  39                 check_config zone MTU
  40                 mtu=$(cat /sys/class/net/${zone}/mtu 2>/dev/null)
  41                 [ "$MTU" = "$mtu" ]
  42                 exit $?
  43                 ;;
  44
  45         pre-up)
  46                 ;;
  47
  48         post-up)
  49                 check_config zone MTU
  50                 message="Setting the MTU for ${zone} to ${MTU}..."
  51                 echo "${MTU}" > "/sys/class/net/${zone}/mtu"
  52                 evaluate_retval standard
  53                 ;;
  54
  55         pre-down)
  56                 check_config zone MTU
  57                 message="Resetting MTU for ${zone} to 1500..."
  58                 echo ${DEFAULT_MTU} > "/sys/class/net/${zone}/mtu"
  59                 evaluate_retval standard
  60                 ;;
  61
  62         post-down)
  63                 ;;
  64
  65         config)
  66                 MTU=$1
  67                 check_config zone MTU
  68                 cat << EOF >> ${CONFIG_ZONES}/${zone}/${HOOK_NAME}
  69 HOOK="${HOOK_NAME}"
  70 MTU="${MTU}"
  71 EOF
  72                 exit $?
  73                 ;;
  74
  75         discover)
  76                 exit ${EXIT_ERROR}
  77                 ;;
  78
  79         *)
  80                 usage
  81                 exit 1
  82         ;;
  83 esac
  84
  85 # End $NETWORK_DEVICES/services/mtu