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