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# Copyright (C) 2009-2010 OpenWrt.org
# Copyright (C) 2009 Malte S. Stretz
export FW_4_ERROR=0
export FW_6_ERROR=0
export FW_i_ERROR=0
export FW_e_ERROR=0
export FW_a_ERROR=0
#TODO: remove this
[ "${-#*x}" == "$-" ] && {
fw() {
fw__exec "$@"
}
} || {
fw() {
local os=$-
set +x
fw__exec "$@"
local rc=$?
set -$os
return $rc
}
}
fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
local cmd fam tab chn tgt pos
local i
for i in cmd fam tab chn tgt pos; do
if [ "$1" -a "$1" != '{' ]; then
eval "$i='$1'"
shift
else
eval "$i=-"
fi
done
fw__rc() {
export FW_${fam#G}_ERROR=$1
return $1
}
fw__dualip() {
fw $cmd 4 $tab $chn $tgt $pos "$@"
fw $cmd 6 $tab $chn $tgt $pos "$@"
fw__rc $((FW_4_ERROR | FW_6_ERROR))
}
fw__autoip() {
local ip4 ip6
shift
while [ "$1" != '}' ]; do
case "$1" in
*:*) ip6=1 ;;
*.*.*.*) ip4=1 ;;
esac
shift
done
shift
if [ "${ip4:-4}" == "${ip6:-6}" ]; then
echo "fw: can't mix ip4 and ip6" >&2
return 1
fi
local ver=${ip4:+4}${ip6:+6}
fam=i
fw $cmd ${ver:-i} $tab $chn $tgt $pos "$@"
fw__rc $?
}
fw__has() {
local tab=${1:-$tab}
if [ $tab == '-' ]; then
type $app > /dev/null 2> /dev/null
fw__rc $(($? & 1))
return
fi
local mod
eval "mod=\$FW_${fam#G}_${tab}"
if [ "$mod" ]; then
fw__rc $mod
return
fi
case "$fam" in
*4) mod=iptable_${tab} ;;
*6) mod=ip6table_${tab} ;;
*) mod=. ;;
esac
grep -q "^${mod} " /proc/modules
mod=$?
export FW_${fam}_${tab}=$mod
fw__rc $mod
}
fw__err() {
local err
eval "err=\$FW_${fam}_ERROR"
fw__rc $err
}
local app=
local pol=
case "$fam" in
*4) [ $FW_DISABLE_IPV4 == 0 ] && app=iptables || return ;;
*6) [ $FW_DISABLE_IPV6 == 0 ] && app=ip6tables || return ;;
i) fw__dualip "$@"; return ;;
I) fw__autoip "$@"; return ;;
e) app=ebtables ;;
a) app=arptables ;;
-) fw $cmd i $tab $chn $tgt $pos "$@"; return ;;
*) return 254 ;;
esac
case "$tab" in
f) tab=filter ;;
m) tab=mangle ;;
n) tab=nat ;;
r) tab=raw ;;
-) tab=filter ;;
esac
case "$cmd:$chn:$tgt:$pos" in
add:*:-:*) cmd=new-chain ;;
add:*:*:-) cmd=append ;;
add:*:*:$) cmd=append ;;
add:*:*:*) cmd=insert ;;
del:-:*:*) cmd=delete-chain; fw flush $fam $tab ;;
del:*:-:*) cmd=delete-chain; fw flush $fam $tab $chn ;;
del:*:*:*) cmd=delete ;;
flush:*) ;;
policy:*) pol=$tgt; tgt=- ;;
has:*) fw__has; return ;;
err:*) fw__err; return ;;
list:*) cmd="numeric --verbose --$cmd" ;;
*) return 254 ;;
esac
case "$chn" in
-) chn= ;;
esac
case "$tgt" in
-) tgt= ;;
esac
case "$pos" in
^) pos=1 ;;
$) pos= ;;
-) pos= ;;
esac
if ! fw__has - family || ! fw__has $tab ; then
export FW_${fam}_ERROR=0
return 0
fi
case "$fam" in
G*) shift; while [ $# -gt 0 ] && [ "$1" != "{" ]; do shift; done ;;
esac
if [ $# -gt 0 ]; then
shift
if [ $cmd == delete ]; then
pos=
fi
fi
local cmdline="$app --table ${tab} --${cmd} ${chn} ${pol} ${pos} ${tgt:+--jump "$tgt"}"
while [ $# -gt 1 ]; do
case "$app:$1" in
ip6tables:--icmp-type) cmdline="$cmdline --icmpv6-type" ;;
ip6tables:icmp|ip6tables:ICMP) cmdline="$cmdline icmpv6" ;;
iptables:--icmpv6-type) cmdline="$cmdline --icmp-type" ;;
iptables:icmpv6) cmdline="$cmdline icmp" ;;
*) cmdline="$cmdline $1" ;;
esac
shift
done
[ -n "$FW_TRACE" ] && echo $cmdline >&2
$cmdline
fw__rc $?
}
fw_get_port_range() {
local _var=$1
local _ports=$2
local _delim=${3:-:}
if [ "$4" ]; then
fw_get_port_range $_var "${_ports}-${4}" $_delim
return
fi
local _first=${_ports%-*}
local _last=${_ports#*-}
if [ "$_first" != "$_last" ]; then
export -- "$_var=$_first$_delim$_last"
else
export -- "$_var=$_first"
fi
}
fw_get_family_mode() {
local _var="$1"
local _hint="$2"
local _zone="$3"
local _mode="$4"
local _ipv4 _ipv6
[ -n "$FW_ZONES4$FW_ZONES6" ] && {
list_contains FW_ZONES4 $_zone && _ipv4=1 || _ipv4=0
list_contains FW_ZONES6 $_zone && _ipv6=1 || _ipv6=0
} || {
_ipv4=$(uci_get_state firewall core ${_zone}_ipv4 0)
_ipv6=$(uci_get_state firewall core ${_zone}_ipv6 0)
}
case "$_hint:$_ipv4:$_ipv6" in
*4:1:*|*:1:0) export -n -- "$_var=G4" ;;
*6:*:1|*:0:1) export -n -- "$_var=G6" ;;
*) export -n -- "$_var=$_mode" ;;
esac
}
fw_get_negation() {
local _var="$1"
local _flag="$2"
local _ipaddr="$3"
[ "${_ipaddr#!}" != "$_ipaddr" ] && \
export -n -- "$_var=! $_flag ${_ipaddr#!}" || \
export -n -- "$_var=${_ipaddr:+$_flag $_ipaddr}"
}
fw_get_subnet4() {
local _var="$1"
local _flag="$2"
local _name="$3"
local _ipaddr="$(uci_get_state network "${_name#!}" ipaddr)"
local _netmask="$(uci_get_state network "${_name#!}" netmask)"
case "$_ipaddr" in
*.*.*.*)
[ "${_name#!}" != "$_name" ] && \
export -n -- "$_var=! $_flag $_ipaddr/${_netmask:-255.255.255.255}" || \
export -n -- "$_var=$_flag $_ipaddr/${_netmask:-255.255.255.255}"
;;
*) export -n -- "$_var=" ;;
esac
}
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