[package] firewall: add support for "local" port forwards which target an internal...

[openwrt.git] / package / firewall / files / lib / fw.sh

diff --git a/package/firewall/files/lib/fw.sh b/package/firewall/files/lib/fw.sh
index 16a39b6..0814ffc 100644 (file)
--- a/package/firewall/files/lib/fw.sh
+++ b/package/firewall/files/lib/fw.sh
@@ -74,21 +74,8 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
                        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 $mod
+               [ "$app" != ip6tables ] || [ "$tab" != nat ]
+               fw__rc $?
        }
 
        fw__err() {
@@ -137,10 +124,13 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
        case "$tgt" in
                -) tgt= ;;
        esac
+
+       local rule_offset
        case "$pos" in
                ^) pos=1 ;;
                $) pos= ;;
                -) pos= ;;
+               +) eval "rule_offset=\${FW__RULE_OFS_${app}_${tab}_${chn}:-1}" ;;
        esac
 
        if ! fw__has - family || ! fw__has $tab ; then
@@ -159,13 +149,29 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
                fi
        fi
 
-       local cmdline="$app --table ${tab} --${cmd} ${chn} ${pol} ${pos} ${tgt:+--jump "$tgt"}"
+       local cmdline="$app --table ${tab} --${cmd} ${chn} ${pol} ${rule_offset:-${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" ;;
+               # special parameter handling
+               case "$1:$2" in
+                       -p:icmp*|-p:1|-p:58|--protocol:icmp*|--protocol:1|--protocol:58)
+                               [ "$app" = ip6tables ] && \
+                                       cmdline="$cmdline -p icmpv6" || \
+                                       cmdline="$cmdline -p icmp"
+                               shift
+                       ;;
+                       --icmp-type:*|--icmpv6-type:*)
+                               local icmp_type
+                               if [ "$app" = ip6tables ] && fw_check_icmptype6 icmp_type "$2"; then
+                                       cmdline="$cmdline $icmp_type"
+                               elif [ "$app" = iptables ] && fw_check_icmptype4 icmp_type "$2"; then
+                                       cmdline="$cmdline $icmp_type"
+                               else
+                                       local fam=IPv4; [ "$app" = ip6tables ] && fam=IPv6
+                                       fw_log info "ICMP type '$2' is not valid for $fam address family, skipping rule"
+                                       return 1
+                               fi
+                               shift   
+                       ;;
                        *) cmdline="$cmdline $1" ;;
                esac
                shift
@@ -175,7 +181,10 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
 
        $cmdline
 
-       fw__rc $?
+       local rv=$?
+       [ $rv -eq 0 ] && [ -n "$rule_offset" ] && \
+               export -- "FW__RULE_OFS_${app}_${tab}_${chn}=$(($rule_offset + 1))"
+       fw__rc $rv
 }
 
 fw_get_port_range() {
@@ -189,8 +198,8 @@ fw_get_port_range() {
 
        local _first=${_ports%-*}
        local _last=${_ports#*-}
-       if [ "$_first" != "$_last" ]; then
-               export -- "$_var=$_first$_delim$_last"
+       if [ "${_first#!}" != "${_last#!}" ]; then
+               export -- "$_var=$_first$_delim${_last#!}"
        else
                export -- "$_var=$_first"
        fi
@@ -203,12 +212,17 @@ fw_get_family_mode() {
        local _mode="$4"
 
        local _ipv4 _ipv6
-       [ -n "$FW_ZONES4$FW_ZONES6" ] && {
-               list_contains FW_ZONES4 $_zone && _ipv4=1 || _ipv4=0
-               list_contains FW_ZONES6 $_zone && _ipv6=1 || _ipv6=0
+       [ "$_zone" != "*" ] && {
+               [ -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)
+               }
        } || {
-               _ipv4=$(uci_get_state firewall core ${_zone}_ipv4 0)
-               _ipv6=$(uci_get_state firewall core ${_zone}_ipv6 0)
+               _ipv4=1
+               _ipv6=1
        }
 
        case "$_hint:$_ipv4:$_ipv6" in
@@ -221,9 +235,93 @@ fw_get_family_mode() {
 fw_get_negation() {
        local _var="$1"
        local _flag="$2"
-       local _ipaddr="$3"
+       local _value="$3"
+
+       [ "${_value#!}" != "$_value" ] && \
+               export -n -- "$_var=! $_flag ${_value#!}" || \
+               export -n -- "$_var=${_value:+$_flag $_value}"
+}
+
+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}"
+                       return 0
+               ;;
+       esac
+
+       export -n -- "$_var="
+       return 1
+}
+
+fw_check_icmptype4() {
+       local _var="$1"
+       local _type="$2"
+       case "$_type" in
+               ![0-9]*) export -n -- "$_var=! --icmp-type ${_type#!}"; return 0 ;;
+               [0-9]*)  export -n -- "$_var=--icmp-type $_type";       return 0 ;;
+       esac
+
+       [ -z "$FW_ICMP4_TYPES" ] && \
+               export FW_ICMP4_TYPES=$(
+                       iptables -p icmp -h 2>/dev/null | \
+                       sed -n -e '/^Valid ICMP Types:/ {
+                               n; :r;
+                               /router-advertisement/d;
+                               /router-solicitation/d;
+                               s/[()]/ /g; s/[[:space:]]\+/\n/g; p; n; b r
+                       }' | sort -u
+               )
+
+       local _check
+       for _check in $FW_ICMP4_TYPES; do
+               if [ "$_check" = "${_type#!}" ]; then
+                       [ "${_type#!}" != "$_type" ] && \
+                               export -n -- "$_var=! --icmp-type ${_type#!}" || \
+                               export -n -- "$_var=--icmp-type $_type"
+                       return 0
+               fi
+       done
+
+       export -n -- "$_var="
+       return 1
+}
+
+fw_check_icmptype6() {
+       local _var="$1"
+       local _type="$2"
+       case "$_type" in
+               ![0-9]*) export -n -- "$_var=! --icmpv6-type ${_type#!}"; return 0 ;;
+               [0-9]*)  export -n -- "$_var=--icmpv6-type $_type";       return 0 ;;
+       esac
+
+       [ -z "$FW_ICMP6_TYPES" ] && \
+               export FW_ICMP6_TYPES=$(
+                       ip6tables -p icmpv6 -h 2>/dev/null | \
+                       sed -n -e '/^Valid ICMPv6 Types:/ {
+                               n; :r; s/[()]/ /g; s/[[:space:]]\+/\n/g; p; n; b r
+                       }' | sort -u
+               )
+
+       local _check
+       for _check in $FW_ICMP6_TYPES; do
+               if [ "$_check" = "${_type#!}" ]; then
+                       [ "${_type#!}" != "$_type" ] && \
+                               export -n -- "$_var=! --icmpv6-type ${_type#!}" || \
+                               export -n -- "$_var=--icmpv6-type $_type"
+                       return 0
+               fi
+       done
 
-       [ "${_ipaddr#!}" != "$_ipaddr" ] && \
-               export -n -- "$_var=! $_flag ${_ipaddr#!}" || \
-               export -n -- "$_var=${_ipaddr:+$_flag $_ipaddr}"
+       export -n -- "$_var="
+       return 1
 }