mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-29 10:08:59 +00:00
325 lines
6.8 KiB
Bash
325 lines
6.8 KiB
Bash
# Copyright (C) 2009-2010 OpenWrt.org
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# Copyright (C) 2009 Malte S. Stretz
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export FW_4_ERROR=0
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export FW_6_ERROR=0
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export FW_i_ERROR=0
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export FW_e_ERROR=0
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export FW_a_ERROR=0
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#TODO: remove this
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[ "${-#*x}" == "$-" ] && {
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fw() {
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fw__exec "$@"
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}
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} || {
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fw() {
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local os=$-
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set +x
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fw__exec "$@"
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local rc=$?
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set -$os
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return $rc
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}
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}
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fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
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local cmd fam tab chn tgt pos
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local i
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for i in cmd fam tab chn tgt pos; do
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if [ "$1" -a "$1" != '{' ]; then
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eval "$i='$1'"
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shift
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else
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eval "$i=-"
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fi
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done
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fw__rc() {
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export FW_${fam#G}_ERROR=$1
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return $1
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}
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fw__dualip() {
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fw $cmd 4 $tab $chn $tgt $pos "$@"
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fw $cmd 6 $tab $chn $tgt $pos "$@"
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fw__rc $((FW_4_ERROR | FW_6_ERROR))
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}
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fw__autoip() {
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local ip4 ip6
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shift
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while [ "$1" != '}' ]; do
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case "$1" in
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*:*) ip6=1 ;;
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*.*.*.*) ip4=1 ;;
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esac
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shift
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done
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shift
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if [ "${ip4:-4}" == "${ip6:-6}" ]; then
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echo "fw: can't mix ip4 and ip6" >&2
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return 1
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fi
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local ver=${ip4:+4}${ip6:+6}
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fam=i
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fw $cmd ${ver:-i} $tab $chn $tgt $pos "$@"
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fw__rc $?
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}
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fw__has() {
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local tab=${1:-$tab}
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if [ $tab == '-' ]; then
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type $app > /dev/null 2> /dev/null
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fw__rc $(($? & 1))
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return
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fi
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[ "$app" != ip6tables ] || [ "$tab" != nat ]
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fw__rc $?
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}
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fw__err() {
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local err
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eval "err=\$FW_${fam}_ERROR"
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fw__rc $err
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}
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local app=
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local pol=
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case "$fam" in
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*4) [ $FW_DISABLE_IPV4 == 0 ] && app=iptables || return ;;
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*6) [ $FW_DISABLE_IPV6 == 0 ] && app=ip6tables || return ;;
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i) fw__dualip "$@"; return ;;
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I) fw__autoip "$@"; return ;;
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e) app=ebtables ;;
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a) app=arptables ;;
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-) fw $cmd i $tab $chn $tgt $pos "$@"; return ;;
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*) return 254 ;;
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esac
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case "$tab" in
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f) tab=filter ;;
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m) tab=mangle ;;
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n) tab=nat ;;
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r) tab=raw ;;
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-) tab=filter ;;
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esac
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case "$cmd:$chn:$tgt:$pos" in
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add:*:-:*) cmd=new-chain ;;
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add:*:*:-) cmd=append ;;
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add:*:*:$) cmd=append ;;
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add:*:*:*) cmd=insert ;;
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del:-:*:*) cmd=delete-chain; fw flush $fam $tab ;;
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del:*:-:*) cmd=delete-chain; fw flush $fam $tab $chn ;;
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del:*:*:*) cmd=delete ;;
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flush:*) ;;
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policy:*) pol=$tgt; tgt=- ;;
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has:*) fw__has; return ;;
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err:*) fw__err; return ;;
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list:*) cmd="numeric --verbose --$cmd" ;;
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*) return 254 ;;
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esac
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case "$chn" in
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-) chn= ;;
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esac
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case "$tgt" in
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-) tgt= ;;
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esac
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local rule_offset
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case "$pos" in
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^) pos=1 ;;
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$) pos= ;;
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-) pos= ;;
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+) eval "rule_offset=\${FW__RULE_OFS_${app}_${tab}_${chn}:-1}" ;;
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esac
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if ! fw__has - family || ! fw__has $tab ; then
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export FW_${fam}_ERROR=0
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return 0
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fi
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case "$fam" in
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G*) shift; while [ $# -gt 0 ] && [ "$1" != "{" ]; do shift; done ;;
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esac
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if [ $# -gt 0 ]; then
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shift
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if [ $cmd == delete ]; then
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pos=
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fi
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fi
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local cmdline="$app --table ${tab} --${cmd} ${chn} ${pol} ${rule_offset:-${pos}} ${tgt:+--jump "$tgt"}"
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while [ $# -gt 1 ]; do
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# special parameter handling
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case "$1:$2" in
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-p:icmp*|-p:1|-p:58|--protocol:icmp*|--protocol:1|--protocol:58)
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[ "$app" = ip6tables ] && \
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cmdline="$cmdline -p icmpv6" || \
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cmdline="$cmdline -p icmp"
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shift
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;;
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--icmp-type:*|--icmpv6-type:*)
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local icmp_type
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if [ "$app" = ip6tables ] && fw_check_icmptype6 icmp_type "$2"; then
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cmdline="$cmdline $icmp_type"
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elif [ "$app" = iptables ] && fw_check_icmptype4 icmp_type "$2"; then
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cmdline="$cmdline $icmp_type"
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else
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local fam=IPv4; [ "$app" = ip6tables ] && fam=IPv6
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fw_log info "ICMP type '$2' is not valid for $fam address family, skipping rule"
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return 1
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fi
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shift
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;;
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*) cmdline="$cmdline $1" ;;
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esac
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shift
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done
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[ -n "$FW_TRACE" ] && echo $cmdline >&2
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$cmdline
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local rv=$?
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[ $rv -eq 0 ] && [ -n "$rule_offset" ] && \
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export -- "FW__RULE_OFS_${app}_${tab}_${chn}=$(($rule_offset + 1))"
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fw__rc $rv
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}
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fw_get_port_range() {
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local _var=$1
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local _ports=$2
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local _delim=${3:-:}
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if [ "$4" ]; then
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fw_get_port_range $_var "${_ports}-${4}" $_delim
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return
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fi
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local _first=${_ports%-*}
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local _last=${_ports#*-}
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if [ "${_first#!}" != "${_last#!}" ]; then
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export -- "$_var=$_first$_delim${_last#!}"
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else
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export -- "$_var=$_first"
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fi
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}
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fw_get_family_mode() {
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local _var="$1"
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local _hint="$2"
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local _zone="$3"
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local _mode="$4"
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local _ipv4 _ipv6
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[ "$_zone" != "*" ] && {
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[ -n "$FW_ZONES4$FW_ZONES6" ] && {
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list_contains FW_ZONES4 "$_zone" && _ipv4=1 || _ipv4=0
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list_contains FW_ZONES6 "$_zone" && _ipv6=1 || _ipv6=0
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} || {
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_ipv4=$(uci_get_state firewall core "${_zone}_ipv4" 0)
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_ipv6=$(uci_get_state firewall core "${_zone}_ipv6" 0)
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}
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} || {
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_ipv4=1
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_ipv6=1
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}
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case "$_hint:$_ipv4:$_ipv6" in
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*4:1:*|*:1:0) export -n -- "$_var=G4" ;;
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*6:*:1|*:0:1) export -n -- "$_var=G6" ;;
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*) export -n -- "$_var=$_mode" ;;
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esac
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}
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fw_get_negation() {
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local _var="$1"
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local _flag="$2"
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local _value="$3"
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[ "${_value#!}" != "$_value" ] && \
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export -n -- "$_var=! $_flag ${_value#!}" || \
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export -n -- "$_var=${_value:+$_flag $_value}"
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}
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fw_get_subnet4() {
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local _var="$1"
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local _flag="$2"
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local _name="$3"
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local _ipaddr="$(uci_get_state network "${_name#!}" ipaddr)"
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local _netmask="$(uci_get_state network "${_name#!}" netmask)"
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case "$_ipaddr" in
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*.*.*.*)
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[ "${_name#!}" != "$_name" ] && \
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export -n -- "$_var=! $_flag $_ipaddr/${_netmask:-255.255.255.255}" || \
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export -n -- "$_var=$_flag $_ipaddr/${_netmask:-255.255.255.255}"
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return 0
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;;
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esac
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export -n -- "$_var="
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return 1
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}
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fw_check_icmptype4() {
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local _var="$1"
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local _type="$2"
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case "$_type" in
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![0-9]*) export -n -- "$_var=! --icmp-type ${_type#!}"; return 0 ;;
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[0-9]*) export -n -- "$_var=--icmp-type $_type"; return 0 ;;
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esac
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[ -z "$FW_ICMP4_TYPES" ] && \
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export FW_ICMP4_TYPES=$(
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iptables -p icmp -h 2>/dev/null | \
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sed -n -e '/^Valid ICMP Types:/ {
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n; :r; s/[()]/ /g; s/[[:space:]]\+/\n/g; p; n; b r
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}' | sort -u
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)
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local _check
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for _check in $FW_ICMP4_TYPES; do
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if [ "$_check" = "${_type#!}" ]; then
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[ "${_type#!}" != "$_type" ] && \
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export -n -- "$_var=! --icmp-type ${_type#!}" || \
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export -n -- "$_var=--icmp-type $_type"
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return 0
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fi
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done
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export -n -- "$_var="
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return 1
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}
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fw_check_icmptype6() {
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local _var="$1"
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local _type="$2"
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case "$_type" in
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![0-9]*) export -n -- "$_var=! --icmpv6-type ${_type#!}"; return 0 ;;
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[0-9]*) export -n -- "$_var=--icmpv6-type $_type"; return 0 ;;
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esac
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[ -z "$FW_ICMP6_TYPES" ] && \
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export FW_ICMP6_TYPES=$(
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ip6tables -p icmpv6 -h 2>/dev/null | \
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sed -n -e '/^Valid ICMPv6 Types:/ {
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n; :r; s/[()]/ /g; s/[[:space:]]\+/\n/g; p; n; b r
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}' | sort -u
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)
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local _check
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for _check in $FW_ICMP6_TYPES; do
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if [ "$_check" = "${_type#!}" ]; then
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[ "${_type#!}" != "$_type" ] && \
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export -n -- "$_var=! --icmpv6-type ${_type#!}" || \
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export -n -- "$_var=--icmpv6-type $_type"
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return 0
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fi
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done
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export -n -- "$_var="
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return 1
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}
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