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