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 "$ifname" ] || {
  15                 ifname=$(uci_get_state network "$iface" ifname)
  16                 ifname="${ifname%%:*}"
  17                 [ -z "$ifname" ] && return 0
  18         }
  19
  20         [ "$ifname" == "lo" ] && return 0
  21
  22         fw_callback pre interface
  23
  24         fw__do_rules() {
  25                 local action=$1
  26                 local zone=$2
  27                 local chain=zone_${zone}
  28                 local ifname=$3
  29                 local subnet=$4
  30                 local masq_src=$5
  31                 local masq_dest=$6
  32
  33                 local inet onet
  34                 local mode=$(fw_get_family_mode x $zone i)
  35
  36                 case "$mode/$subnet" in
  37                         # Zone supports v6 only or dual, need v6
  38                         G6/*:*|i/*:*)
  39                                 inet="-s $subnet -d ::/0"
  40                                 onet="-s ::/0 -d $subnet"
  41                                 mode=6
  42                         ;;
  43
  44                         # Zone supports v4 only or dual, need v4
  45                         G4/*.*.*.*|i/*.*.*.*)
  46                                 inet="-s $subnet -d 0.0.0.0/0"
  47                                 onet="-s 0.0.0.0/0 -d $subnet"
  48                                 mode=4
  49                         ;;
  50
  51                         # Need v6 while zone is v4
  52                         */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
  53
  54                         # Need v4 while zone is v6
  55                         */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
  56                 esac
  57
  58                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet }
  59                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet }
  60                 fw $action $mode f ${chain}_DROP   DROP   $ { -o "$ifname" $onet }
  61                 fw $action $mode f ${chain}_DROP   DROP   $ { -i "$ifname" $inet }
  62                 fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
  63                 fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
  64
  65                 # NB: if MASQUERADING for IPv6 becomes available we'll need a family check here
  66                 local msrc mdst
  67                 for msrc in ${masq_src:-0.0.0.0/0}; do
  68                         [ "${msrc#!}" != "$msrc" ] && msrc="! -s ${msrc#!}" || msrc="-s $msrc"
  69                         for mdst in ${subnet:-${masq_dest:-0.0.0.0/0}}; do
  70                                 [ "${mdst#!}" != "$mdst" ] && mdst="! -d ${mdst#!}" || mdst="-d $mdst"
  71                                 fw $action $mode n ${chain}_nat MASQUERADE $ { -o "$ifname" $msrc $mdst }
  72                         done
  73                 done
  74
  75                 fw $action $mode f ${chain}_MSSFIX TCPMSS  $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
  76
  77                 fw $action $mode f input   ${chain}         $ { -i "$ifname" $inet }
  78                 fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet }
  79                 fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet }
  80                 fw $action $mode r PREROUTING ${chain}_notrack    $ { -i "$ifname" $inet }
  81         }
  82
  83         local old_zones old_ifname old_subnets old_masq_src old_masq_dest
  84         config_get old_zones core "${iface}_zone"
  85         [ -n "$old_zones" ] && {
  86                 config_get old_ifname core "${iface}_ifname"
  87                 config_get old_subnets core "${iface}_subnets"
  88                 config_get old_masq_src core "${iface}_masq_src"
  89                 config_get old_masq_dest core "${iface}_masq_dest"
  90
  91                 local z
  92                 for z in $old_zones; do
  93                         local n
  94                         for n in ${old_subnets:-""}; do
  95                                 fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
  96                                 fw__do_rules del $z $old_ifname $n "$old_masq_src" "$old_masq_dest"
  97                         done
  98
  99                         [ -n "$old_subnets" ] || ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 100                 done
 101
 102                 local old_aliases
 103                 config_get old_aliases core "${iface}_aliases"
 104
 105                 local a
 106                 for a in $old_aliases; do
 107                         fw_configure_interface "$a" del "$old_ifname"
 108                 done
 109
 110                 uci_revert_state firewall core "${iface}_zone"
 111                 uci_revert_state firewall core "${iface}_ifname"
 112                 uci_revert_state firewall core "${iface}_subnets"
 113                 uci_revert_state firewall core "${iface}_aliases"
 114                 uci_revert_state firewall core "${iface}_masq_src"
 115                 uci_revert_state firewall core "${iface}_masq_dest"
 116         }
 117
 118         [ "$action" == del ] && return
 119
 120         [ -z "$aliasnet" ] && {
 121                 local aliases
 122                 config_get aliases "$iface" aliases
 123
 124                 local a
 125                 for a in $aliases; do
 126                         local ipaddr netmask ip6addr
 127                         config_get ipaddr "$a" ipaddr
 128                         config_get netmask "$a" netmask
 129                         config_get ip6addr "$a" ip6addr
 130
 131                         [ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}"
 132                         [ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr"
 133                 done
 134
 135                 fw_sysctl_interface $ifname
 136                 fw_callback post interface
 137
 138                 uci_set_state firewall core "${iface}_aliases" "$aliases"
 139         } || {
 140                 local subnets=
 141                 config_get subnets core "${iface}_subnets"
 142                 append subnets "$aliasnet"
 143
 144                 config_set core "${iface}_subnets" "$subnets"
 145                 uci_set_state firewall core "${iface}_subnets" "$subnets"
 146         }
 147
 148         local new_zones=
 149         local new_masq_src=
 150         local new_masq_dest=
 151         load_zone() {
 152                 fw_config_get_zone "$1"
 153                 list_contains zone_network "$iface" || return
 154
 155                 fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
 156                 fw__do_rules add ${zone_name} "$ifname" "$aliasnet" "$zone_masq_src" "$zone_masq_dest"
 157                 append new_zones $zone_name
 158                 append new_masq_src "$zone_masq_src"
 159                 append new_masq_dest "$zone_masq_dest"
 160
 161                 [ -n "$aliasnet" ] || ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 162         }
 163         config_foreach load_zone zone
 164
 165         uci_set_state firewall core "${iface}_zone" "$new_zones"
 166         uci_set_state firewall core "${iface}_ifname" "$ifname"
 167         uci_set_state firewall core "${iface}_masq_src" "$new_masq_src"
 168         uci_set_state firewall core "${iface}_masq_dest" "$new_masq_dest"
 169 }
 170
 171 fw_sysctl_interface() {
 172         local ifname=$1
 173         {
 174                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 175                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 176                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 177                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 178         } >/dev/null 2>/dev/null
 179 }
 180