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Implement 'default' interface option
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@2129 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
This commit is contained in:
teastep
parent
955e8e683a
commit
1ca5bde7b5
@ -4,6 +4,8 @@ Changes in 2.3.2
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2) Add TEST column to /etc/shorewall/routes
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3) Add support for 'default' interface option.
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Changes in 2.3.1
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1) Change the behavior of SAVE_IPSETS and allow 'ipsets' files in
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@ -1019,11 +1019,20 @@ validate_interfaces_file() {
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routeback)
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[ -n "$z" ] || startup_error "The routeback option may not be specified on a multi-zone interface"
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;;
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mark=*)
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default)
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[ -n "$ROUTE_TARGET" ] || \
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startup_error "Interface marks require ROUTE Target support in your kernel and iptables: $option"
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eval ${iface}_mark=${option#*=}
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MARK_INTERFACES="$MARK_INTERFACES $interface"
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startup_error "Default route interfaces require ROUTE Target support in your kernel and iptables: $option"
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[ -n "$CONNMARK" ] || \
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startup_error "Default route interfaces require CONNMARK Target support in your kernel and iptables: $option"
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[ -n "$CONNMARK_MATCH" ] || \
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startup_error "Default route interfaces require Connmark Match support in your kernel and iptables: $option"
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[ -n "$XMARK" ] || \
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startup_error "Default route interfaces require Extended MARK support in your kernel and iptables: $option"
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[ $ROUTEMARK -lt 4096 ] || \
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startup_error "Too many default route interfaces defined"
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eval ${iface}_routemark=$ROUTEMARK
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ROUTEMARK=$(($ROUTEMARK + 256))
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ROUTEMARK_INTERFACES="$ROUTEMARK_INTERFACES $interface"
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;;
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*)
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error_message "Warning: Invalid option ($option) in record \"$r\""
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@ -2460,6 +2469,24 @@ setup_ecn() # $1 = file name
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fi
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}
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#
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# Check that a mark value or mask is less that 256
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#
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verify_mark() # $1 = value to test
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{
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verify_mark1()
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{
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[ $1 -lt 256 ]
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}
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verify_mark2()
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{
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verify_mark1 $1 2> /dev/null
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}
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verify_mark2 $1 || fatal_error "Invalid Mark or Mask value: $1"
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}
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#
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# Process a TC Rule - $MARKING_CHAIN is assumed to contain the name of the
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# default marking chain
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@ -2588,29 +2615,46 @@ process_tc_rule()
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chain=tcpost
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;;
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esac
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fi
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case $mark in
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SAVE)
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target="CONNMARK --save-mark"
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target="CONNMARK --save-mark --mask 255"
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mark=
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;;
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SAVE/*)
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target="CONNMARK --save-mark --mask"
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mark=${mark#*/}
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verify_mark $mark
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;;
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RESTORE)
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target="CONNMARK --restore-mark"
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target="CONNMARK --restore-mark --mask 255"
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mark=
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;;
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RESTORE/*)
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target="CONNMARK --restore-mark --mask"
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mark=${mark#*/}
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verify_mark $mark
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;;
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CONTINUE)
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target=RETURN
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mark=
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;;
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*)
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if [ "$chain" != tcpost ]; then
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case $mark in
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*/*)
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verify_mark ${mark%/*}
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verify_mark ${mark#*/}
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;;
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*)
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verify_mark $mark
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mark=$mark/255
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;;
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esac
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fi
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;;
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esac
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case $testval in
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@ -2634,6 +2678,19 @@ process_tc_rule()
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;;
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esac
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if [ -n "$marktest" ] ; then
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case $testval in
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*/*)
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verify_mark ${testval%/*}
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verify_mark ${testval#*/}
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;;
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*)
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verify_mark $testval
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testval=$testval/255
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;;
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esac
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fi
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for source in $(separate_list ${sources:=-}); do
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for dest in $(separate_list ${dests:=-}); do
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for port in $(separate_list ${ports:=-}); do
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@ -5026,11 +5083,12 @@ process_tos() # $1 = name of tos file
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{
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echo "Processing $1..."
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strip_file tos $1
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if [ -s $TMP_DIR/tos ] ; then
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run_iptables -t mangle -N pretos
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run_iptables -t mangle -N outtos
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strip_file tos $1
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while read src dst protocol sport dport tos; do
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expandv src dst protocol sport dport tos
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rule="$(echo $src $dst $protocol $sport $dport $tos)"
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@ -5039,6 +5097,7 @@ process_tos() # $1 = name of tos file
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run_iptables -t mangle -A PREROUTING -j pretos
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run_iptables -t mangle -A OUTPUT -j outtos
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fi
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}
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#
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@ -5323,6 +5382,7 @@ add_a_route()
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case $testval in
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-)
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testval=
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;;
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!*:C)
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marktest="connmark ! "
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@ -5342,6 +5402,19 @@ add_a_route()
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;;
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esac
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if [ -n "$testval" ] ; then
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case $testval in
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*/*)
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verify_mark ${testval%/*}
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verify_mark ${testval#*/}
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;;
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*)
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verify_mark $testval
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testval=$testval/255
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;;
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esac
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fi
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[ -n "$marktest" ] && r="${r}-m ${marktest}--mark $testval "
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r="${r}-j ROUTE "
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@ -5355,6 +5428,17 @@ add_a_route()
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progress_message " Routing Rule \"$rule\" Added."
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}
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#
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# Create routing chains
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#
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create_routing_chains()
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{
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run_iptables -t mangle -N routefwd
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run_iptables -t mangle -A FORWARD -j routefwd
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run_iptables -t mangle -N routeout
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run_iptables -t mangle -A OUTPUT -j routeout
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}
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#
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# Set up Routing
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#
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@ -5366,10 +5450,7 @@ setup_routes() # $1 = file name
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echo "Processing $1..."
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[ -n "$ROUTE_TARGET" ] || \
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fatal_error "Entries in /etc/shorewall/routes requires that your kernel and iptables have ROUTE target support"
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run_iptables -t mangle -N routefwd
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run_iptables -t mangle -A FORWARD -j routefwd
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run_iptables -t mangle -N routeout
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run_iptables -t mangle -A OUTPUT -j routeout
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create_routing_chains
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while read source dest proto port sport testval interface gateway; do
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@ -5377,6 +5458,8 @@ setup_routes() # $1 = file name
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rule="$source $dest $proto $port $sport testval $interface $gateway"
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add_a_route
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done < $TMP_DIR/routes
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elif [ -n "$ROUTEMARK_INTERFACES" ]; then
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create_routing_chains
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fi
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}
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@ -6057,6 +6140,8 @@ determine_capabilities() {
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IPSET_MATCH=
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ROUTE_TARGET=
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XMARK=
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CONNMARK=
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CONNMARK_MATCH=
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qt $IPTABLES -N fooX1234
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qt $IPTABLES -A fooX1234 -m conntrack --ctorigdst 192.168.1.1 -j ACCEPT && CONNTRACK_MATCH=Yes
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@ -6067,10 +6152,12 @@ determine_capabilities() {
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qt $IPTABLES -A fooX1234 -m iprange --src-range 192.168.1.5-192.168.1.124 -j ACCEPT && IPRANGE_MATCH=Yes
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qt $IPTABLES -A fooX1234 -m recent --update -j ACCEPT && RECENT_MATCH=Yes
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qt $IPTABLES -A fooX1234 -m owner --cmd-owner foo -j ACCEPT && OWNER_MATCH=Yes
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qt $IPTABLES -A fooX1234 -m connmark --mark 2 -j ACCEPT && CONNMARK_MATCH=Yes
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qt $IPTABLES -t mangle -N fooX1234
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qt $IPTABLES -t mangle -A fooX1234 -j ROUTE --oif eth0 && ROUTE_TARGET=Yes
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qt $IPTABLES -t mangle -A fooX1234 -j MARK --or-mark 2 && XMARK=Yes
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qt $IPTABLES -t mangle -A fooX1234 -j CONNMARK --save-mark && CONNMARK=Yes
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qt $IPTABLES -t mangle -F fooX1234
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qt $IPTABLES -t mangle -X fooX1234
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@ -6118,6 +6205,8 @@ report_capabilities() {
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report_capability "Ipset Match" $IPSET_MATCH
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report_capability "ROUTE Target" $ROUTE_TARGET
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report_capability "Extended MARK Target" $XMARK
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report_capability "CONNMARK Target" $CONNMARK
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report_capability "Connmark Match" $CONNMARK_MATCH
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}
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#
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@ -7068,16 +7157,43 @@ activate_rules()
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done
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done
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for interface in $MARK_INTERFACES ; do
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if [ -n "$CONNMARK" ]; then
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run_iptables -t mangle -I PREROUTING -m connmark ! --mark 0 -j CONNMARK --restore-mark
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fi
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if [ -n "$ROUTEMARK_INTERFACES" ]; then
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run_iptables -t mangle -N routemark
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for interface in $ROUTEMARK_INTERFACES ; do
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iface=$(chain_base $interface)
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chain=$(input_chain $interface)
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eval mark_value=\$${iface}_mark
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eval mark_value=\$${iface}_routemark
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run_iptables -t mangle -N $chain
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run_iptables -t mangle -A PREROUTING -i $interface -j $chain
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run_iptables -t mangle -A PREROUTING -i $interface -m mark --mark 0/3840 -j routemark
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run_iptables -t mangle -A routemark -i $interface -j MARK --or-mark $mark_value
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eval run_iptables -t mangle -A PREROUTING -i $interface -j MARK --set-mark
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ip route ls dev $interface 2> /dev/null | while read net rest; do
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case $net in
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default)
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gateway=$(find_gateway $rest)
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for chain in routefwd routeout; do
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for interface1 in $ROUTEMARK_INTERFACES; do
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run_iptables -t mangle -A $chain -o $interface1 -m mark --mark $mark_value/3840 -j ROUTE --oif $interface --gw $gateway --continue
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done
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done
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;;
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*)
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for chain in routefwd routeout; do
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run_iptables -t mangle -A $chain -d $net -o $interface -j RETURN
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done
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;;
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esac
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done
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done
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run_iptables -t mangle -A routemark -m mark ! --mark 0/3840 -j CONNMARK --save-mark --mask 3840
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run_iptables -t mangle -I POSTROUTING -j MARK --and-mark 255
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fi
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for interface in $ALL_INTERFACES ; do
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run_iptables -A FORWARD -i $interface -j $(forward_chain $interface)
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@ -7227,7 +7343,11 @@ define_firewall() # $1 = Command (Start or Restart)
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[ -n "$TC_ENABLED" ] && setup_tc
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routes=$(find_file routes)
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[ -f $routes ] && setup_routes $routes
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if [ -f $routes ]; then
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setup_routes $routes
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elif [ -n "$ROUTEMARK_INTERFACES" ]; then
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add_routing_chains
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fi
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echo "Activating Rules..."; activate_rules
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@ -7794,7 +7914,8 @@ do_initialize() {
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RESTOREBASE=
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TMP_DIR=
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ALL_INTERFACES=
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MARK_INTERFACES=
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ROUTEMARK_INTERFACES=
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ROUTEMARK=256
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stopping=
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have_mutex=
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@ -778,6 +778,17 @@ find_device() {
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done
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}
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#
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# Find the value 'via' in the passed arguments then echo the next value
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#
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find_gateway() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xvia ] && echo $2 && return
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shift
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done
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}
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#
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# Find the interfaces that have a route to the passed address - the default
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# route is not used.
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@ -167,9 +167,21 @@
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# detectnets - Automatically taylors the zone named
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# in the ZONE column to include only those
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# hosts routed through the interface.
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#
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# upnp - Incoming requests from this interface may
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# be remapped via UPNP (upnpd).
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#
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# default - This interface is one of two or more on the
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# the firewall that have a default route.
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# You should specify 'default' on all such
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# interfaces, the interfaces should be up when
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# Shorewall starts and each interface must have
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# a default route configured in the main routing
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# table. There are many restrictions on the use
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# of this feature; see
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# http://shorewall.net/Shorewall_and_Routing.html
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# for details.
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#
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# WARNING: DO NOT SET THE detectnets OPTION ON YOUR
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# INTERNET INTERFACE.
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#
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@ -90,6 +90,27 @@ New Features in version 2.3.2
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GATEWAY The gateway that the packet is to be forewarded
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through.
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2) Shorewall 2.3.2 includes support for multiple internet interfaces to
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different ISPs. This feature is enabled by setting the "default"
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option for each internet interface in /etc/shorewall/interfaces.
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This feature requires a number of extensions in your kernel and
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iptables:
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- Extended MARK support.
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- ROUTE Target support.
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- CONNMARK Target support and conntrack match support.
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Each interface with the 'default' option given must have a default
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gateway route in the main routing table and must be up when
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Shorewall is [re]started.
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When you specify 'default' on two or more entries in
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/etc/shorewall/interfaces, replies to connections from these
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interfaces are routed back out of the same interface and through the
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correct gateway.
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-----------------------------------------------------------------------
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Problems corrected in version 2.3.1
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