package/firewall/files/lib/fw.sh

   1 # Copyright (C) 2009-2010 OpenWrt.org
   2 # Copyright (C) 2009 Malte S. Stretz
   3
   4 export FW_4_ERROR=0
   5 export FW_6_ERROR=0
   6 export FW_i_ERROR=0
   7 export FW_e_ERROR=0
   8 export FW_a_ERROR=0
   9
  10 #TODO: remove this
  11 [ "${-#*x}" == "$-" ] && {
  12         fw() {
  13                 fw__exec "$@"
  14         }
  15 } || {
  16         fw() {
  17                 local os=$-
  18                 set +x
  19                 fw__exec "$@"
  20                 local rc=$?
  21                 set -$os
  22                 return $rc
  23         }
  24 }
  25
  26 fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
  27         local cmd fam tab chn tgt pos
  28         local i
  29         for i in cmd fam tab chn tgt pos; do
  30                 if [ "$1" -a "$1" != '{' ]; then
  31                         eval "$i='$1'"
  32                         shift
  33                 else
  34                         eval "$i=-"
  35                 fi
  36         done
  37
  38         fw__rc() {
  39                 export FW_${fam#G}_ERROR=$1
  40                 return $1
  41         }
  42
  43         fw__dualip() {
  44                 fw $cmd 4 $tab $chn $tgt $pos "$@"
  45                 fw $cmd 6 $tab $chn $tgt $pos "$@"
  46                 fw__rc $((FW_4_ERROR | FW_6_ERROR))
  47         }
  48
  49         fw__autoip() {
  50                 local ip4 ip6
  51                 shift
  52                 while [ "$1" != '}' ]; do
  53                         case "$1" in
  54                                 *:*) ip6=1 ;;
  55                                 *.*.*.*) ip4=1 ;;
  56                         esac
  57                         shift
  58                 done
  59                 shift
  60                 if [ "${ip4:-4}" == "${ip6:-6}" ]; then
  61                         echo "fw: can't mix ip4 and ip6" >&2
  62                         return 1
  63                 fi
  64                 local ver=${ip4:+4}${ip6:+6}
  65                 fam=i
  66                 fw $cmd ${ver:-i} $tab $chn $tgt $pos "$@"
  67                 fw__rc $?
  68         }
  69
  70         fw__has() {
  71                 local tab=${1:-$tab}
  72                 if [ $tab == '-' ]; then
  73                         type $app > /dev/null 2> /dev/null
  74                         fw__rc $(($? & 1))
  75                         return
  76                 fi
  77                 local mod
  78                 eval "mod=\$FW_${fam#G}_${tab}"
  79                 if [ "$mod" ]; then
  80                         fw__rc $mod
  81                         return
  82                 fi
  83                 case "$fam" in
  84                         *4) mod=iptable_${tab} ;;
  85                         *6) mod=ip6table_${tab} ;;
  86                         *) mod=. ;;
  87                 esac
  88                 grep -q "^${mod} " /proc/modules
  89                 mod=$?
  90                 export FW_${fam}_${tab}=$mod
  91                 fw__rc $mod
  92         }
  93
  94         fw__err() {
  95                 local err
  96                 eval "err=\$FW_${fam}_ERROR"
  97                 fw__rc $err
  98         }
  99
 100         local app=
 101         local pol=
 102         case "$fam" in
 103                 *4) [ $FW_DISABLE_IPV4 == 0 ] && app=iptables  || return ;;
 104                 *6) [ $FW_DISABLE_IPV6 == 0 ] && app=ip6tables || return ;;
 105                 i) fw__dualip "$@"; return ;;
 106                 I) fw__autoip "$@"; return ;;
 107                 e) app=ebtables ;;
 108                 a) app=arptables ;;
 109                 -) fw $cmd i $tab $chn $tgt $pos "$@"; return ;;
 110                 *) return 254 ;;
 111         esac
 112         case "$tab" in
 113                 f) tab=filter ;;
 114                 m) tab=mangle ;;
 115                 n) tab=nat ;;
 116                 r) tab=raw ;;
 117                 -) tab=filter ;;
 118         esac
 119         case "$cmd:$chn:$tgt:$pos" in
 120                 add:*:-:*) cmd=new-chain ;;
 121                 add:*:*:-) cmd=append ;;
 122                 add:*:*:$) cmd=append ;;
 123                 add:*:*:*) cmd=insert ;;
 124                 del:-:*:*) cmd=delete-chain; fw flush $fam $tab ;;
 125                 del:*:-:*) cmd=delete-chain; fw flush $fam $tab $chn ;;
 126                 del:*:*:*) cmd=delete ;;
 127                 flush:*) ;;
 128                 policy:*) pol=$tgt; tgt=- ;;
 129                 has:*) fw__has; return ;;
 130                 err:*) fw__err; return ;;
 131                 list:*) cmd="numeric --verbose --$cmd" ;;
 132                 *) return 254 ;;
 133         esac
 134         case "$chn" in
 135                 -) chn= ;;
 136         esac
 137         case "$tgt" in
 138                 -) tgt= ;;
 139         esac
 140
 141         local rule_offset
 142         case "$pos" in
 143                 ^) pos=1 ;;
 144                 $) pos= ;;
 145                 -) pos= ;;
 146                 +) eval "rule_offset=\${FW__RULE_OFS_${app}_${tab}_${chn}:-1}" ;;
 147         esac
 148
 149         if ! fw__has - family || ! fw__has $tab ; then
 150                 export FW_${fam}_ERROR=0
 151                 return 0
 152         fi
 153
 154         case "$fam" in
 155                 G*) shift; while [ $# -gt 0 ] && [ "$1" != "{" ]; do shift; done ;;
 156         esac
 157
 158         if [ $# -gt 0 ]; then
 159                 shift
 160                 if [ $cmd == delete ]; then
 161                         pos=
 162                 fi
 163         fi
 164
 165         local cmdline="$app --table ${tab} --${cmd} ${chn} ${pol} ${rule_offset:-${pos}} ${tgt:+--jump "$tgt"}"
 166         while [ $# -gt 1 ]; do
 167                 # special parameter handling
 168                 case "$1:$2" in
 169                         -p:icmp*|-p:1|-p:58|--protocol:icmp*|--protocol:1|--protocol:58)
 170                                 [ "$app" = ip6tables ] && \
 171                                         cmdline="$cmdline -p icmpv6" || \
 172                                         cmdline="$cmdline -p icmp"
 173                                 shift
 174                         ;;
 175                         --icmp-type:*|--icmpv6-type:*)
 176                                 local icmp_type
 177                                 if [ "$app" = ip6tables ] && fw_check_icmptype6 icmp_type "$2"; then
 178                                         cmdline="$cmdline $icmp_type"
 179                                 elif [ "$app" = iptables ] && fw_check_icmptype4 icmp_type "$2"; then
 180                                         cmdline="$cmdline $icmp_type"
 181                                 else
 182                                         local fam=IPv4; [ "$app" = ip6tables ] && fam=IPv6
 183                                         fw_log info "ICMP type '$2' is not valid for $fam address family, skipping rule"
 184                                         return 1
 185                                 fi
 186                                 shift
 187                         ;;
 188                         *) cmdline="$cmdline $1" ;;
 189                 esac
 190                 shift
 191         done
 192
 193         [ -n "$FW_TRACE" ] && echo $cmdline >&2
 194
 195         $cmdline
 196
 197         local rv=$?
 198         [ $rv -eq 0 ] && [ -n "$rule_offset" ] && \
 199                 export -- "FW__RULE_OFS_${app}_${tab}_${chn}=$(($rule_offset + 1))"
 200         fw__rc $rv
 201 }
 202
 203 fw_get_port_range() {
 204         local _var=$1
 205         local _ports=$2
 206         local _delim=${3:-:}
 207         if [ "$4" ]; then
 208                 fw_get_port_range $_var "${_ports}-${4}" $_delim
 209                 return
 210         fi
 211
 212         local _first=${_ports%-*}
 213         local _last=${_ports#*-}
 214         if [ "${_first#!}" != "${_last#!}" ]; then
 215                 export -- "$_var=$_first$_delim${_last#!}"
 216         else
 217                 export -- "$_var=$_first"
 218         fi
 219 }
 220
 221 fw_get_family_mode() {
 222         local _var="$1"
 223         local _hint="$2"
 224         local _zone="$3"
 225         local _mode="$4"
 226
 227         local _ipv4 _ipv6
 228         [ -n "$FW_ZONES4$FW_ZONES6" ] && {
 229                 list_contains FW_ZONES4 $_zone && _ipv4=1 || _ipv4=0
 230                 list_contains FW_ZONES6 $_zone && _ipv6=1 || _ipv6=0
 231         } || {
 232                 _ipv4=$(uci_get_state firewall core ${_zone}_ipv4 0)
 233                 _ipv6=$(uci_get_state firewall core ${_zone}_ipv6 0)
 234         }
 235
 236         case "$_hint:$_ipv4:$_ipv6" in
 237                 *4:1:*|*:1:0) export -n -- "$_var=G4" ;;
 238                 *6:*:1|*:0:1) export -n -- "$_var=G6" ;;
 239                 *) export -n -- "$_var=$_mode" ;;
 240         esac
 241 }
 242
 243 fw_get_negation() {
 244         local _var="$1"
 245         local _flag="$2"
 246         local _value="$3"
 247
 248         [ "${_value#!}" != "$_value" ] && \
 249                 export -n -- "$_var=! $_flag ${_value#!}" || \
 250                 export -n -- "$_var=${_value:+$_flag $_value}"
 251 }
 252
 253 fw_get_subnet4() {
 254         local _var="$1"
 255         local _flag="$2"
 256         local _name="$3"
 257
 258         local _ipaddr="$(uci_get_state network "${_name#!}" ipaddr)"
 259         local _netmask="$(uci_get_state network "${_name#!}" netmask)"
 260
 261         case "$_ipaddr" in
 262                 *.*.*.*)
 263                         [ "${_name#!}" != "$_name" ] && \
 264                                 export -n -- "$_var=! $_flag $_ipaddr/${_netmask:-255.255.255.255}" || \
 265                                 export -n -- "$_var=$_flag $_ipaddr/${_netmask:-255.255.255.255}"
 266                 ;;
 267                 *) export -n -- "$_var=" ;;
 268         esac
 269 }
 270
 271 fw_check_icmptype4() {
 272         local _var="$1"
 273         local _type="$2"
 274         case "$_type" in
 275                 ![0-9]*) export -n -- "$_var=! --icmp-type ${_type#!}"; return 0 ;;
 276                 [0-9]*)  export -n -- "$_var=--icmp-type $_type";       return 0 ;;
 277         esac
 278
 279         [ -z "$FW_ICMP4_TYPES" ] && \
 280                 export FW_ICMP4_TYPES=$(
 281                         iptables -p icmp -h 2>/dev/null | \
 282                         sed -n -e '/^Valid ICMP Types:/ {
 283                                 n; :r;
 284                                 /router-advertisement/d;
 285                                 /router-solicitation/d;
 286                                 s/[()]/ /g; s/[[:space:]]\+/\n/g; p; n; b r
 287                         }' | sort -u
 288                 )
 289
 290         local _check
 291         for _check in $FW_ICMP4_TYPES; do
 292                 if [ "$_check" = "${_type#!}" ]; then
 293                         [ "${_type#!}" != "$_type" ] && \
 294                                 export -n -- "$_var=! --icmp-type ${_type#!}" || \
 295                                 export -n -- "$_var=--icmp-type $_type"
 296                         return 0
 297                 fi
 298         done
 299
 300         export -n -- "$_var="
 301         return 1
 302 }
 303
 304 fw_check_icmptype6() {
 305         local _var="$1"
 306         local _type="$2"
 307         case "$_type" in
 308                 ![0-9]*) export -n -- "$_var=! --icmpv6-type ${_type#!}"; return 0 ;;
 309                 [0-9]*)  export -n -- "$_var=--icmpv6-type $_type";       return 0 ;;
 310         esac
 311
 312         [ -z "$FW_ICMP6_TYPES" ] && \
 313                 export FW_ICMP6_TYPES=$(
 314                         ip6tables -p icmpv6 -h 2>/dev/null | \
 315                         sed -n -e '/^Valid ICMPv6 Types:/ {
 316                                 n; :r; s/[()]/ /g; s/[[:space:]]\+/\n/g; p; n; b r
 317                         }' | sort -u
 318                 )
 319
 320         local _check
 321         for _check in $FW_ICMP6_TYPES; do
 322                 if [ "$_check" = "${_type#!}" ]; then
 323                         [ "${_type#!}" != "$_type" ] && \
 324                                 export -n -- "$_var=! --icmpv6-type ${_type#!}" || \
 325                                 export -n -- "$_var=--icmpv6-type $_type"
 326                         return 0
 327                 fi
 328         done
 329
 330         export -n -- "$_var="
 331         return 1
 332 }