forked from extern/shorewall_code
Rate Limiting in Rules - Part 1
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@705 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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teastep
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@ -2042,6 +2042,7 @@ refresh_tc() {
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# by this function
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# cport = Source Port Specification
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# multiport = String to invoke multiport match if appropriate
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# ratelimit = Optional rate limiting clause
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#
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add_nat_rule() {
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local chain
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@ -2125,7 +2126,7 @@ add_nat_rule() {
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log_rule $loglevel $chain $logtarget -t nat
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fi
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addnatrule $chain $proto -j $target1 # Protocol is necessary for port redirection
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addnatrule $chain $ratelimit $proto -j $target1 # Protocol is necessary for port redirection
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else
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for adr in `separate_list $addr`; do
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if [ -n "$loglevel" ]; then
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@ -2133,7 +2134,7 @@ add_nat_rule() {
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`fix_bang $proto $cli $sports -d $adr $multiport $dports`
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fi
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run_iptables2 -t nat -A OUTPUT $proto $sports -d $adr $multiport $dports -j $target1
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run_iptables2 -t nat -A OUTPUT $ratelimit $proto $sports -d $adr $multiport $dports -j $target1
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done
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fi
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else
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@ -2160,19 +2161,19 @@ add_nat_rule() {
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done
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if [ -n "$loglevel" ]; then
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log_rule $loglevel $chain $logtarget -t nat
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log_rule $loglevel $chain $logtarget $ratelimit -t nat
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fi
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addnatrule $chain $proto -j $target1 # Protocol is necessary for port redirection
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addnatrule $chain $ratelimit $proto -j $target1 # Protocol is necessary for port redirection
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else
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for adr in `separate_list $addr`; do
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if [ -n "$loglevel" ]; then
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ensurenatchain $chain
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log_rule $loglevel $chain $logtarget -t nat \
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log_rule $loglevel $chain $logtarget $ratelimit -t nat \
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`fix_bang $proto $cli $sports -d $adr $multiport $dports`
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fi
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addnatrule $chain $proto $cli $sports \
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addnatrule $chain $proto $ratelimit $cli $sports \
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-d $adr $multiport $dports -j $target1
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done
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fi
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@ -2207,7 +2208,8 @@ add_nat_rule() {
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fi
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fi
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[ "x$addr" = "x0.0.0.0/0" ] && addr=
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[ "x$addr" = "x0.0.0.0/0" ] && addr=
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ratelimit=
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}
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#
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@ -2225,6 +2227,7 @@ add_nat_rule() {
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# multioption = String to invoke multiport match if appropriate
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# servport = Port the server listens on
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# chain = The canonical chain for this rule
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# ratelimit = Optional rate limiting clause
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#
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add_a_rule()
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{
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@ -2371,32 +2374,32 @@ add_a_rule()
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if [ -n "$addr" -a -n "$CONNTRACK_MATCH" ]; then
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for adr in `separate_list $addr`; do
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if [ -n "$loglevel" -a -z "$natrule" ]; then
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log_rule $loglevel $chain $logtarget -m conntrack --ctorigdst $adr \
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log_rule $loglevel $chain $logtarget $ratelimit -m conntrack --ctorigdst $adr \
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`fix_bang $proto $sports $multiport $state $cli -d $srv $dports`
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fi
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run_iptables2 -A $chain $proto $multiport $state $cli $sports \
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run_iptables2 -A $chain $proto $ratelimit $multiport $state $cli $sports \
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-d $srv $dports -m conntrack --ctorigdst $adr -j $target
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done
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else
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if [ -n "$loglevel" -a -z "$natrule" ]; then
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log_rule $loglevel $chain $logtarget \
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log_rule $loglevel $chain $logtarget $ratelimit \
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`fix_bang $proto $sports $multiport $state $cli -d $srv $dports`
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fi
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run_iptables2 -A $chain $proto $multiport $state $cli $sports \
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-d $srv $dports -j $target
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-d $srv $dports $ratelimit -j $target
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fi
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done
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done
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else
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if [ -n "$loglevel" -a -z "$natrule" ]; then
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log_rule $loglevel $chain $logtarget \
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log_rule $loglevel $chain $logtarget $ratelimit \
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`fix_bang $proto $sports $multiport $state $cli $dports`
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fi
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run_iptables2 -A $chain $proto $multiport $state $cli $sports \
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$dports -j $target
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$dports $ratelimit -j $target
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fi
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fi
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fi
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@ -2410,13 +2413,13 @@ add_a_rule()
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if [ $command != check ]; then
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if [ -n "$loglevel" ]; then
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log_rule $loglevel $chain $logtarget \
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log_rule $loglevel $chain $logtarget $ratelimit \
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`fix_bang $proto $multiport $dest_interface $state $cli $sports $dports`
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fi
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if [ $logtarget != LOG ]; then
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run_iptables2 -A $chain $proto $multiport $dest_interface $state \
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$cli $sports $dports -j $target
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$cli $sports $dports $ratelimit -j $target
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fi
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fi
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fi
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@ -2442,7 +2445,19 @@ process_rule() # $1 = target
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local address="$7"
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local rule="`echo $target $clients $servers $protocol $ports $cports $address`"
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# Function Body -- isolate log level
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# Function Body - isolate rate limit
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if [ "$target" = "${target%<*}" ]; then
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ratelimit=
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else
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ratelimit="${target#*<}"
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ratelimit="${ratelimit%>*}"
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target="${target%<*}${target#*>}"
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expandv ratelimit
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ratelimit="-m limit --limit ${ratelimit%:*} --limit-burst ${ratelimit#*:}"
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fi
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# Isolate log level
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if [ "$target" = "${target%:*}" ]; then
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loglevel=
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@ -2451,7 +2466,7 @@ process_rule() # $1 = target
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target="${target%:*}"
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expandv loglevel
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fi
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logtarget="$target"
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dnat_only=
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@ -2465,36 +2480,42 @@ process_rule() # $1 = target
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[ "x$address" = "x-" ] && address=
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case $target in
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DNAT)
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target=ACCEPT
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address=${address:=detect}
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;;
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DNAT-)
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target=ACCEPT
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address=${address:=detect}
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dnat_only=Yes
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logtarget=DNAT
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;;
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REDIRECT)
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target=ACCEPT
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address=${address:=all}
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if [ "x-" = "x$servers" ]; then
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servers=$FW
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else
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servers="$FW::$servers"
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fi
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;;
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REDIRECT-)
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target=ACCEPT
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logtarget=REDIRECT
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dnat_only=Yes
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address=${address:=all}
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if [ "x-" = "x$servers" ]; then
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servers=$FW
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else
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servers="$FW::$servers"
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fi
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;;
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DNAT)
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target=ACCEPT
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address=${address:=detect}
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;;
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DNAT-)
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target=ACCEPT
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address=${address:=detect}
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dnat_only=Yes
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logtarget=DNAT
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;;
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REDIRECT)
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target=ACCEPT
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address=${address:=all}
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if [ "x-" = "x$servers" ]; then
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servers=$FW
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else
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servers="$FW::$servers"
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fi
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;;
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REDIRECT-)
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target=ACCEPT
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logtarget=REDIRECT
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dnat_only=Yes
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address=${address:=all}
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if [ "x-" = "x$servers" ]; then
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servers=$FW
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else
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servers="$FW::$servers"
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fi
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;;
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ACCEPT)
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;;
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*)
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[ -n "$ratelimit" ] && fatal_error \
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"Rate Limiting only available with ACCEPT, DNAT[-] and REDIRECT[-]"
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;;
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esac
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# Parse and validate source
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@ -2690,8 +2711,8 @@ process_rules() # $1 = name of rules file
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}
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while read xtarget xclients xservers xprotocol xports xcports xaddress; do
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case "${xtarget%:*}" in
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temp="${xtarget%:*}"
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case "${temp%<*}" in
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ACCEPT|DROP|REJECT|DNAT|DNAT-|REDIRECT|REDIRECT-|LOG|CONTINUE)
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expandv xclients xservers xprotocol xports xcports xaddress
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@ -56,6 +56,19 @@
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# to a separate log through use of ulogd
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# (http://www.gnumonks.org/projects/ulogd).
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#
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# Finally, you may rate-limit the rule by optionally
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# ending the ACTION with
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#
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# < <rate>/<interval>:<burst> >
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#
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# where <rate> is the number of connections per
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# <interval> ("sec" or "min") and <burst> is the
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# largest burst permitted. Rate limiting may only be
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# used with ACCEPT, DNAT and REDIRECT and there may be
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# no whitespace embedded in the specification.
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#
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# Example: <10/sec:20>
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#
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# SOURCE Source hosts to which the rule applies. May be a zone
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# defined in /etc/shorewall/zones, $FW to indicate the
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# firewall itself, or "all" If the ACTION is DNAT or
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