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 $var) "
   8         val="${val// $item / }"
   9         val="${val# }"
  10         val="${val% }"
  11         uci_revert_state firewall core $var
  12         uci_set_state firewall core $var "${val:+$val }$item"
  13 }
  14
  15 fw__uci_state_del() {
  16         local var="$1"
  17         local item="$2"
  18
  19         local val=" $(uci_get_state firewall core $var) "
  20         val="${val// $item / }"
  21         val="${val# }"
  22         val="${val% }"
  23         uci_revert_state firewall core $var
  24         uci_set_state firewall core $var "$val"
  25 }
  26
  27 fw_configure_interface() {
  28         local iface=$1
  29         local action=$2
  30         local ifname=$3
  31         local aliasnet=$4
  32
  33         [ "$action" == "add" ] && {
  34                 local status=$(uci_get_state network "$iface" up 0)
  35                 [ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
  36         }
  37
  38         [ -n "$ifname" ] || {
  39                 ifname=$(uci_get_state network "$iface" ifname)
  40                 ifname="${ifname%%:*}"
  41                 [ -z "$ifname" ] && return 0
  42         }
  43
  44         [ "$ifname" == "lo" ] && return 0
  45
  46         fw_callback pre interface
  47
  48         fw__do_rules() {
  49                 local action=$1
  50                 local zone=$2
  51                 local chain=zone_${zone}
  52                 local ifname=$3
  53                 local subnet=$4
  54
  55                 local inet onet mode
  56                 fw_get_family_mode mode x $zone i
  57
  58                 case "$mode/$subnet" in
  59                         # Zone supports v6 only or dual, need v6
  60                         G6/*:*|i/*:*)
  61                                 inet="-s $subnet -d ::/0"
  62                                 onet="-s ::/0 -d $subnet"
  63                                 mode=6
  64                         ;;
  65
  66                         # Zone supports v4 only or dual, need v4
  67                         G4/*.*.*.*|i/*.*.*.*)
  68                                 inet="-s $subnet -d 0.0.0.0/0"
  69                                 onet="-s 0.0.0.0/0 -d $subnet"
  70                                 mode=4
  71                         ;;
  72
  73                         # Need v6 while zone is v4
  74                         */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
  75
  76                         # Need v4 while zone is v6
  77                         */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
  78
  79                         # Strip prefix
  80                         *) mode="${mode#G}" ;;
  81                 esac
  82
  83                 lock /var/run/firewall-interface.lock
  84
  85                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet }
  86                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet }
  87                 fw $action $mode f ${chain}_DROP   DROP   $ { -o "$ifname" $onet }
  88                 fw $action $mode f ${chain}_DROP   DROP   $ { -i "$ifname" $inet }
  89                 fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
  90                 fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
  91
  92                 fw $action $mode f ${chain}_MSSFIX TCPMSS  $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
  93
  94                 fw $action $mode f input   ${chain}         $ { -i "$ifname" $inet }
  95                 fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet }
  96                 fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet }
  97                 fw $action $mode r PREROUTING ${chain}_notrack    $ { -i "$ifname" $inet }
  98                 fw $action $mode n POSTROUTING ${chain}_nat       $ { -o "$ifname" $onet }
  99
 100                 lock -u /var/run/firewall-interface.lock
 101         }
 102
 103         local old_zones old_ifname old_subnets
 104         config_get old_zones core "${iface}_zone"
 105         [ -n "$old_zones" ] && {
 106                 config_get old_ifname core "${iface}_ifname"
 107                 config_get old_subnets core "${iface}_subnets"
 108
 109                 local z
 110                 for z in $old_zones; do
 111                         local n
 112                         for n in ${old_subnets:-""}; do
 113                                 fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
 114                                 fw__do_rules del $z $old_ifname $n
 115                         done
 116
 117                         [ -n "$old_subnets" ] || {
 118                                 fw__uci_state_del "${z}_networks" "$iface"
 119                                 env -i ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 120                         }
 121                 done
 122
 123                 local old_aliases
 124                 config_get old_aliases core "${iface}_aliases"
 125
 126                 local a
 127                 for a in $old_aliases; do
 128                         fw_configure_interface "$a" del "$old_ifname"
 129                 done
 130
 131                 uci_revert_state firewall core "${iface}_zone"
 132                 uci_revert_state firewall core "${iface}_ifname"
 133                 uci_revert_state firewall core "${iface}_subnets"
 134                 uci_revert_state firewall core "${iface}_aliases"
 135         }
 136
 137         [ "$action" == del ] && return
 138
 139         [ -z "$aliasnet" ] && {
 140                 local aliases
 141                 config_get aliases "$iface" aliases
 142
 143                 local a
 144                 for a in $aliases; do
 145                         local ipaddr netmask ip6addr
 146                         config_get ipaddr "$a" ipaddr
 147                         config_get netmask "$a" netmask
 148                         config_get ip6addr "$a" ip6addr
 149
 150                         [ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}"
 151                         [ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr"
 152                 done
 153
 154                 fw_sysctl_interface $ifname
 155                 fw_callback post interface
 156
 157                 uci_set_state firewall core "${iface}_aliases" "$aliases"
 158         } || {
 159                 local subnets=
 160                 config_get subnets core "${iface}_subnets"
 161                 append subnets "$aliasnet"
 162
 163                 config_set core "${iface}_subnets" "$subnets"
 164                 uci_set_state firewall core "${iface}_subnets" "$subnets"
 165         }
 166
 167         local new_zones=
 168         load_zone() {
 169                 fw_config_get_zone "$1"
 170                 list_contains zone_network "$iface" || return
 171
 172                 fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
 173                 fw__do_rules add ${zone_name} "$ifname" "$aliasnet"
 174                 append new_zones $zone_name
 175
 176                 [ -n "$aliasnet" ] || {
 177                         fw__uci_state_add "${zone_name}_networks" "${zone_network}"
 178                         env -i ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 179                 }
 180         }
 181         config_foreach load_zone zone
 182
 183         uci_set_state firewall core "${iface}_zone" "$new_zones"
 184         uci_set_state firewall core "${iface}_ifname" "$ifname"
 185 }
 186
 187 fw_sysctl_interface() {
 188         local ifname=$1
 189         {
 190                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 191                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 192                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 193                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 194         } >/dev/null 2>/dev/null
 195 }
 196