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