package/firewall/files/lib/core_interface.sh

   1 # Copyright (C) 2009-2010 OpenWrt.org
   2
   3 fw__uci_state_add() {
   4         local var="$1"
   5         local item="$2"
   6
   7         local val="$(uci_get_state firewall core $var)"
   8         uci_set_state firewall core $var "${val:+$val }$item"
   9 }
  10
  11 fw__uci_state_del() {
  12         local var="$1"
  13         local item="$2"
  14
  15         local val=" $(uci_get_state firewall core $var) "
  16         val="${val// $item / }"
  17         val="${val# }"
  18         val="${val% }"
  19         uci_set_state firewall core $var "$val"
  20 }
  21
  22 fw_configure_interface() {
  23         local iface=$1
  24         local action=$2
  25         local ifname=$3
  26         local aliasnet=$4
  27
  28         [ "$action" == "add" ] && {
  29                 local status=$(uci_get_state network "$iface" up 0)
  30                 [ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
  31         }
  32
  33         [ -n "$ifname" ] || {
  34                 ifname=$(uci_get_state network "$iface" ifname)
  35                 ifname="${ifname%%:*}"
  36                 [ -z "$ifname" ] && return 0
  37         }
  38
  39         [ "$ifname" == "lo" ] && return 0
  40
  41         fw_callback pre interface
  42
  43         fw__do_rules() {
  44                 local action=$1
  45                 local zone=$2
  46                 local chain=zone_${zone}
  47                 local ifname=$3
  48                 local subnet=$4
  49
  50                 local inet onet mode
  51                 fw_get_family_mode mode x $zone i
  52
  53                 case "$mode/$subnet" in
  54                         # Zone supports v6 only or dual, need v6
  55                         G6/*:*|i/*:*)
  56                                 inet="-s $subnet -d ::/0"
  57                                 onet="-s ::/0 -d $subnet"
  58                                 mode=6
  59                         ;;
  60
  61                         # Zone supports v4 only or dual, need v4
  62                         G4/*.*.*.*|i/*.*.*.*)
  63                                 inet="-s $subnet -d 0.0.0.0/0"
  64                                 onet="-s 0.0.0.0/0 -d $subnet"
  65                                 mode=4
  66                         ;;
  67
  68                         # Need v6 while zone is v4
  69                         */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
  70
  71                         # Need v4 while zone is v6
  72                         */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
  73
  74                         # Strip prefix
  75                         *) mode="${mode#G}" ;;
  76                 esac
  77
  78                 lock /var/run/firewall-interface.lock
  79
  80                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet }
  81                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet }
  82                 fw $action $mode f ${chain}_DROP   DROP   $ { -o "$ifname" $onet }
  83                 fw $action $mode f ${chain}_DROP   DROP   $ { -i "$ifname" $inet }
  84                 fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
  85                 fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
  86
  87                 fw $action $mode f ${chain}_MSSFIX TCPMSS  $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
  88
  89                 fw $action $mode f input   ${chain}         $ { -i "$ifname" $inet }
  90                 fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet }
  91                 fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet }
  92                 fw $action $mode r PREROUTING ${chain}_notrack    $ { -i "$ifname" $inet }
  93                 fw $action $mode n POSTROUTING ${chain}_nat       $ { -o "$ifname" $onet }
  94
  95                 lock -u /var/run/firewall-interface.lock
  96         }
  97
  98         local old_zones old_ifname old_subnets
  99         config_get old_zones core "${iface}_zone"
 100         [ -n "$old_zones" ] && {
 101                 config_get old_ifname core "${iface}_ifname"
 102                 config_get old_subnets core "${iface}_subnets"
 103
 104                 local z
 105                 for z in $old_zones; do
 106                         local n
 107                         for n in ${old_subnets:-""}; do
 108                                 fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
 109                                 fw__do_rules del $z $old_ifname $n
 110                         done
 111
 112                         [ -n "$old_subnets" ] || {
 113                                 fw__uci_state_del "${z}_networks" "$iface"
 114                                 env -i ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 115                         }
 116                 done
 117
 118                 local old_aliases
 119                 config_get old_aliases core "${iface}_aliases"
 120
 121                 local a
 122                 for a in $old_aliases; do
 123                         fw_configure_interface "$a" del "$old_ifname"
 124                 done
 125
 126                 uci_revert_state firewall core "${iface}_zone"
 127                 uci_revert_state firewall core "${iface}_ifname"
 128                 uci_revert_state firewall core "${iface}_subnets"
 129                 uci_revert_state firewall core "${iface}_aliases"
 130         }
 131
 132         [ "$action" == del ] && return
 133
 134         [ -z "$aliasnet" ] && {
 135                 local aliases
 136                 config_get aliases "$iface" aliases
 137
 138                 local a
 139                 for a in $aliases; do
 140                         local ipaddr netmask ip6addr
 141                         config_get ipaddr "$a" ipaddr
 142                         config_get netmask "$a" netmask
 143                         config_get ip6addr "$a" ip6addr
 144
 145                         [ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}"
 146                         [ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr"
 147                 done
 148
 149                 fw_sysctl_interface $ifname
 150                 fw_callback post interface
 151
 152                 uci_set_state firewall core "${iface}_aliases" "$aliases"
 153         } || {
 154                 local subnets=
 155                 config_get subnets core "${iface}_subnets"
 156                 append subnets "$aliasnet"
 157
 158                 config_set core "${iface}_subnets" "$subnets"
 159                 uci_set_state firewall core "${iface}_subnets" "$subnets"
 160         }
 161
 162         local new_zones=
 163         load_zone() {
 164                 fw_config_get_zone "$1"
 165                 list_contains zone_network "$iface" || return
 166
 167                 fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
 168                 fw__do_rules add ${zone_name} "$ifname" "$aliasnet"
 169                 append new_zones $zone_name
 170
 171                 [ -n "$aliasnet" ] || {
 172                         fw__uci_state_add "${zone_name}_networks" "${zone_network}"
 173                         env -i ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 174                 }
 175         }
 176         config_foreach load_zone zone
 177
 178         uci_set_state firewall core "${iface}_zone" "$new_zones"
 179         uci_set_state firewall core "${iface}_ifname" "$ifname"
 180 }
 181
 182 fw_sysctl_interface() {
 183         local ifname=$1
 184         {
 185                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 186                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 187                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 188                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 189         } >/dev/null 2>/dev/null
 190 }
 191