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         local aliasnet=$4
   8
   9         [ "$action" == "add" ] && {
  10                 local status=$(uci_get_state network "$iface" up 0)
  11                 [ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
  12         }
  13
  14         [ -n "$ifname" ] || ifname=$(uci_get_state network "$iface" ifname "$iface")
  15         [ "$ifname" == "lo" ] && return 0
  16
  17         fw_callback pre interface
  18
  19         fw__do_rules() {
  20                 local action=$1
  21                 local zone=$2
  22                 local chain=zone_${zone}
  23                 local ifname=$3
  24                 local subnet=$4
  25
  26                 local inet onet
  27                 local mode=$(fw_get_family_mode x $zone i)
  28
  29                 case "$mode/$subnet" in
  30                         # Zone supports v6 only or dual, need v6
  31                         6/*:*|i/*:*)
  32                                 inet="{ -s $subnet -d ::/0 }"
  33                                 onet="{ -s ::/0 -d $subnet }"
  34                                 mode=6
  35                         ;;
  36
  37                         # Zone supports v4 only or dual, need v4
  38                         4/*.*.*.*|i/*.*.*.*)
  39                                 inet="{ -s $subnet -d 0.0.0.0/0 }"
  40                                 onet="{ -s 0.0.0.0/0 -d $subnet }"
  41                                 mode=4
  42                         ;;
  43
  44                         # Need v6 while zone is v4
  45                         */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
  46
  47                         # Need v4 while zone is v6
  48                         */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
  49                 esac
  50
  51                 fw $action $mode f ${chain}_ACCEPT ACCEPT ^ $onet { -o "$ifname" }
  52                 fw $action $mode f ${chain}_ACCEPT ACCEPT ^ $inet { -i "$ifname" }
  53                 fw $action $mode f ${chain}_DROP   DROP   ^ $onet { -o "$ifname" }
  54                 fw $action $mode f ${chain}_DROP   DROP   ^ $inet { -i "$ifname" }
  55                 fw $action $mode f ${chain}_REJECT reject ^ $onet { -o "$ifname" }
  56                 fw $action $mode f ${chain}_REJECT reject ^ $inet { -i "$ifname" }
  57
  58                 fw $action $mode n ${chain}_nat MASQUERADE ^ $onet { -o "$ifname" }
  59                 fw $action $mode f ${chain}_MSSFIX TCPMSS  ^ $onet { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu }
  60
  61                 fw $action $mode f input   ${chain}         $ $inet { -i "$ifname" }
  62                 fw $action $mode f forward ${chain}_forward $ $inet { -i "$ifname" }
  63                 fw $action $mode n PREROUTING ${chain}_prerouting ^ $inet { -i "$ifname" }
  64                 fw $action $mode r PREROUTING ${chain}_notrack    ^ $inet { -i "$ifname" }
  65         }
  66
  67         local old_zones old_ifname old_subnet
  68         config_get old_zones core "${iface}_zone"
  69         [ -n "$old_zones" ] && {
  70                 config_get old_ifname core "${iface}_ifname"
  71                 config_get old_subnet core "${iface}_subnet"
  72
  73                 local z
  74                 for z in $old_zones; do
  75                         fw_log info "removing $iface ($old_ifname${old_subnet:+ alias $old_subnet}) from zone $z"
  76                         fw__do_rules del $z $old_ifname $old_subnet
  77
  78                         [ -n "$old_subnet" ] || ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
  79                 done
  80
  81                 local old_aliases
  82                 config_get old_aliases core "${iface}_aliases"
  83
  84                 local a
  85                 for a in $old_aliases; do
  86                         fw_configure_interface "$a" del "$old_ifname"
  87                 done
  88
  89                 uci_revert_state firewall core "${iface}_zone"
  90                 uci_revert_state firewall core "${iface}_ifname"
  91                 uci_revert_state firewall core "${iface}_subnet"
  92                 uci_revert_state firewall core "${iface}_aliases"
  93         }
  94
  95         [ "$action" == del ] && return
  96
  97         local new_zones=
  98         load_zone() {
  99                 fw_config_get_zone "$1"
 100                 list_contains zone_network "$iface" || return
 101
 102                 fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
 103                 fw__do_rules add ${zone_name} "$ifname" $aliasnet
 104                 append new_zones $zone_name
 105
 106                 [ -n "$aliasnet" ] || ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 107         }
 108         config_foreach load_zone zone
 109
 110         [ -z "$aliasnet" ] && {
 111                 local aliases
 112                 config_get aliases "$iface" aliases
 113
 114                 local a
 115                 for a in $aliases; do
 116                         local ipaddr netmask ip6addr
 117                         config_get ipaddr "$a" ipaddr
 118                         config_get netmask "$a" netmask
 119                         config_get ip6addr "$a" ip6addr
 120
 121                         [ -n "$ipaddr" ] && fw_configure_interface "$a" add "$ifname" "$ipaddr${netmask:+/$netmask}"
 122                         [ -n "$ip6addr" ] && fw_configure_interface "$a" add "$ifname" "$ip6addr"
 123                 done
 124
 125                 fw_sysctl_interface $ifname
 126                 fw_callback post interface
 127
 128                 uci_set_state firewall core "${iface}_aliases" "$aliases"
 129         }
 130
 131         uci_set_state firewall core "${iface}_zone" "$new_zones"
 132         uci_set_state firewall core "${iface}_ifname" "$ifname"
 133         uci_set_state firewall core "${iface}_subnet" "$aliasnet"
 134 }
 135
 136 fw_sysctl_interface() {
 137         local ifname=$1
 138         {
 139                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 140                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 141                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 142                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 143         } >/dev/null 2>/dev/null
 144 }
 145