package/firewall/files/lib/core_interface.sh

   1 # Copyright (C) 2009-2010 OpenWrt.org
   2
   3 fw_configure_interface() {
   4         local iface=$1
   5         local action=$2
   6         local ifname=$3
   7
   8         [ "$action" == "add" ] && {
   9                 local status=$(uci_get_state network "$iface" up 0)
  10                 [ "$status" == 1 ] || return 0
  11         }
  12
  13         [ -n "$ifname" ] || ifname=$(uci_get_state network "$iface" ifname "$iface")
  14         [ "$ifname" == "lo" ] && return 0
  15
  16         fw_callback pre interface
  17
  18         fw__do_rules() {
  19                 local action=$1
  20                 local zone=$2
  21                 local chain=zone_${zone}
  22                 local ifname=$3
  23
  24                 local mode=$(fw_get_family_mode x $zone i)
  25
  26                 fw $action $mode f ${chain}_ACCEPT ACCEPT ^ { -o "$ifname" }
  27                 fw $action $mode f ${chain}_ACCEPT ACCEPT ^ { -i "$ifname" }
  28                 fw $action $mode f ${chain}_DROP   DROP   ^ { -o "$ifname" }
  29                 fw $action $mode f ${chain}_DROP   DROP   ^ { -i "$ifname" }
  30                 fw $action $mode f ${chain}_REJECT reject ^ { -o "$ifname" }
  31                 fw $action $mode f ${chain}_REJECT reject ^ { -i "$ifname" }
  32
  33                 fw $action $mode n ${chain}_nat MASQUERADE ^ { -o "$ifname" }
  34                 fw $action $mode f ${chain}_MSSFIX TCPMSS  ^ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu }
  35
  36                 fw $action $mode f input   ${chain}         $ { -i "$ifname" }
  37                 fw $action $mode f forward ${chain}_forward $ { -i "$ifname" }
  38                 fw $action $mode n PREROUTING ${chain}_prerouting ^ { -i "$ifname" }
  39                 fw $action $mode r PREROUTING ${chain}_notrack    ^ { -i "$ifname" }
  40         }
  41
  42         local old_zones old_ifname
  43         config_get old_zones core "${iface}_zone"
  44         [ -n "$old_zones" ] && {
  45                 config_get old_ifname core "${iface}_ifname"
  46                 for z in $old_zones; do
  47                         fw_log info "removing $iface ($old_ifname) from zone $z"
  48                         fw__do_rules del $z $old_ifname
  49
  50                         ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
  51                 done
  52                 uci_revert_state firewall core "${iface}_zone"
  53                 uci_revert_state firewall core "${iface}_ifname"
  54         }
  55         [ "$action" == del ] && return
  56
  57         local new_zones
  58         load_zone() {
  59                 fw_config_get_zone "$1"
  60                 list_contains zone_network "$iface" || return
  61
  62                 fw_log info "adding $iface ($ifname) to zone $zone_name"
  63                 fw__do_rules add ${zone_name} "$ifname"
  64                 append new_zones $zone_name
  65
  66                 ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
  67         }
  68         config_foreach load_zone zone
  69
  70         uci_set_state firewall core "${iface}_zone" "$new_zones"
  71         uci_set_state firewall core "${iface}_ifname" "$ifname"
  72
  73         fw_sysctl_interface $ifname
  74
  75         fw_callback post interface
  76 }
  77
  78 fw_sysctl_interface() {
  79         local ifname=$1
  80         {
  81                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
  82                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
  83                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
  84                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
  85         } >/dev/null 2>/dev/null
  86 }
  87