src/initscripts/system/firewall

   1 #!/bin/sh
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2022  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 . /etc/sysconfig/rc
  23 . ${rc_functions}
  24
  25 eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
  26 eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
  27 eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
  28 if [ -r "/var/ipfire/tor/settings"  ]; then
  29         eval $(/usr/local/bin/readhash /var/ipfire/tor/settings)
  30 fi
  31 IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
  32 if [ -z $IFACE ]; then
  33         IFACE="red0"
  34 fi
  35
  36 if [ -f /var/ipfire/red/device ]; then
  37         DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
  38 fi
  39
  40 NAT_MASK="0x0f000000"
  41
  42 IPS_REPEAT_MARK="0x80000000"
  43 IPS_REPEAT_MASK="0x80000000"
  44 IPS_BYPASS_MARK="0x40000000"
  45 IPS_BYPASS_MASK="0x40000000"
  46
  47 IPSET_DB_DIR="/var/lib/location/ipset"
  48
  49 function iptables() {
  50         /sbin/iptables --wait "$@"
  51 }
  52
  53 iptables_init() {
  54         # Flush all rules and delete all custom chains
  55         iptables -F
  56         iptables -t nat -F
  57         iptables -t mangle -F
  58         iptables -t raw -F
  59         iptables -X
  60         iptables -t nat -X
  61         iptables -t mangle -X
  62         iptables -t raw -X
  63
  64         # Set up policies
  65         iptables -P INPUT DROP
  66         iptables -P FORWARD DROP
  67         iptables -P OUTPUT ACCEPT
  68
  69         # Enable TRACE logging to syslog
  70         modprobe nf_log_ipv4
  71         sysctl -q -w net.netfilter.nf_log.2=nf_log_ipv4
  72
  73         # IPS Bypass Chain which stores the BYPASS bit in connection tracking
  74         iptables -N IPSBYPASS
  75         iptables -A IPSBYPASS -j CONNMARK --save-mark --mask "$(( ~IPS_REPEAT_MASK & 0xffffffff ))"
  76
  77         # Jump into bypass chain when the BYPASS bit is set
  78         for chain in INPUT FORWARD OUTPUT; do
  79                 iptables -A "${chain}" -m mark \
  80                         --mark "$(( IPS_REPEAT_MARK | IPS_BYPASS_MARK ))/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j IPSBYPASS
  81         done
  82
  83         # Empty LOG_DROP and LOG_REJECT chains
  84         iptables -N LOG_DROP
  85         iptables -A LOG_DROP   -m limit --limit 10/second -j LOG
  86         iptables -A LOG_DROP   -j DROP
  87         iptables -N LOG_REJECT
  88         iptables -A LOG_REJECT -m limit --limit 10/second -j LOG
  89         iptables -A LOG_REJECT -j REJECT
  90
  91         # This chain will log, then DROPs packets with certain bad combinations
  92         # of flags might indicate a port-scan attempt (xmas, null, etc.)
  93         iptables -N PSCAN
  94         if [ "$DROPPORTSCAN" == "on" ]; then
  95                 iptables -A PSCAN -p tcp  -m limit --limit 10/second -j LOG --log-prefix "DROP_TCP Scan "  -m comment --comment "DROP_TCP PScan"
  96                 iptables -A PSCAN -p udp  -m limit --limit 10/second -j LOG --log-prefix "DROP_UDP Scan "  -m comment --comment "DROP_UDP PScan"
  97                 iptables -A PSCAN -p icmp -m limit --limit 10/second -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
  98                 iptables -A PSCAN -f      -m limit --limit 10/second -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
  99         fi
 100         iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
 101
 102         # New tcp packets without SYN set - could well be an obscure type of port scan
 103         # that's not covered above, may just be a broken Windows machine
 104         iptables -N NEWNOTSYN
 105         if [ "$DROPNEWNOTSYN" == "on" ]; then
 106                 iptables -A NEWNOTSYN  -m limit --limit 10/second -j LOG  --log-prefix "DROP_NEWNOTSYN "
 107         fi
 108         iptables -A NEWNOTSYN  -j DROP -m comment --comment "DROP_NEWNOTSYN"
 109
 110         # Log and subsequently drop spoofed packets or "martians", arriving from sources
 111         # on interfaces where we don't expect them
 112         iptables -N SPOOFED_MARTIAN
 113         if [ "$DROPSPOOFEDMARTIAN" == "on" ]; then
 114                 iptables -A SPOOFED_MARTIAN  -m limit --limit 10/second -j LOG  --log-prefix "DROP_SPOOFED_MARTIAN "
 115         fi
 116         iptables -A SPOOFED_MARTIAN -j DROP -m comment --comment "DROP_SPOOFED_MARTIAN"
 117
 118         # Chain to contain all the rules relating to bad TCP flags
 119         iptables -N BADTCP
 120
 121         # Don't check loopback
 122         iptables -A BADTCP -i lo -j RETURN
 123
 124         # Disallow packets frequently used by port-scanners
 125         # NMAP FIN/URG/PSH (XMAS scan)
 126         iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
 127         # SYN/RST/ACK/FIN/URG
 128         iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
 129         # ALL/ALL
 130         iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
 131         # FIN Stealth
 132         iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
 133         # SYN/RST (also catches xmas variants that set SYN+RST+...)
 134         iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
 135         # SYN/FIN (QueSO or nmap OS probe)
 136         iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
 137         # Null
 138         iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
 139         # NEW TCP without SYN
 140         iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
 141
 142         iptables -A INPUT   -p tcp -j BADTCP
 143         iptables -A FORWARD -p tcp -j BADTCP
 144
 145         # Connection tracking chains
 146         iptables -N CTINVALID
 147         if [ "$LOGDROPCTINVALID" == "on" ]; then
 148                 iptables -A CTINVALID  -m limit --limit 10/second -j LOG  --log-prefix "DROP_CTINVALID "
 149         fi
 150         iptables -A CTINVALID  -j DROP -m comment --comment "DROP_CTINVALID"
 151
 152         iptables -N CONNTRACK
 153         iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
 154         iptables -A CONNTRACK -m conntrack --ctstate INVALID -j CTINVALID
 155         iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
 156
 157         # Restore any connection marks
 158         iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
 159
 160         # Fix for braindead ISPs
 161         iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
 162
 163         # CUSTOM chains, can be used by the users themselves
 164         iptables -N CUSTOMINPUT
 165         iptables -A INPUT -j CUSTOMINPUT
 166         iptables -N CUSTOMFORWARD
 167         iptables -A FORWARD -j CUSTOMFORWARD
 168         iptables -N CUSTOMOUTPUT
 169         iptables -A OUTPUT -j CUSTOMOUTPUT
 170         iptables -t nat -N CUSTOMPREROUTING
 171         iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
 172         iptables -t nat -N CUSTOMPOSTROUTING
 173         iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
 174
 175         # Chains for networks known as being hostile, posing a technical threat to our users
 176         # (i. e. listed at Spamhaus DROP et al.)
 177         iptables -N HOSTILE
 178         iptables -A INPUT -j HOSTILE
 179         iptables -A FORWARD -j HOSTILE
 180         iptables -A OUTPUT -j HOSTILE
 181
 182         iptables -N HOSTILE_DROP
 183         iptables -A HOSTILE_DROP -m limit --limit 10/second -j LOG --log-prefix "DROP_HOSTILE "
 184         iptables -A HOSTILE_DROP -j DROP -m comment --comment "DROP_HOSTILE"
 185
 186         # IP Address Blocklist chains
 187         iptables -N BLOCKLISTIN
 188         iptables -N BLOCKLISTOUT
 189         iptables -A INPUT ! -p icmp -j BLOCKLISTIN
 190         iptables -A FORWARD ! -p icmp -j BLOCKLISTIN
 191         iptables -A FORWARD ! -p icmp -j BLOCKLISTOUT
 192         iptables -A OUTPUT ! -p icmp -j BLOCKLISTOUT
 193
 194         # IPS (Guardian) chains
 195         iptables -N GUARDIAN
 196         iptables -A INPUT -j GUARDIAN
 197         iptables -A FORWARD -j GUARDIAN
 198
 199         # Block non-established IPsec networks
 200         iptables -N IPSECBLOCK
 201         iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
 202         iptables -A OUTPUT  -m policy --dir out --pol none -j IPSECBLOCK
 203
 204         # Block OpenVPN transfer networks
 205         iptables -N OVPNBLOCK
 206         iptables -A INPUT   -i tun+ -j OVPNBLOCK
 207         iptables -A FORWARD -i tun+ -j OVPNBLOCK
 208         iptables -A FORWARD -o tun+ -j OVPNBLOCK
 209
 210         # IPS (Suricata) chains
 211         iptables -N IPS_INPUT
 212         iptables -N IPS_FORWARD
 213         iptables -N IPS_OUTPUT
 214
 215         for chain in INPUT FORWARD OUTPUT; do
 216                 iptables -A "${chain}" -m mark --mark "0x0/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j "IPS_${chain}"
 217         done
 218
 219         # OpenVPN transfer network translation
 220         iptables -t nat -N OVPNNAT
 221         iptables -t nat -A POSTROUTING -j OVPNNAT
 222
 223         # IPTV chains for IGMPPROXY
 224         iptables -N IPTVINPUT
 225         iptables -A INPUT -j IPTVINPUT
 226         iptables -N IPTVFORWARD
 227         iptables -A FORWARD -j IPTVFORWARD
 228
 229         # Allow to ping the firewall.
 230         iptables -N ICMPINPUT
 231         iptables -A INPUT -j ICMPINPUT
 232         iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
 233
 234         # Accept everything on loopback
 235         iptables -N LOOPBACK
 236         iptables -A LOOPBACK -i lo -j ACCEPT
 237         iptables -A LOOPBACK -o lo -j ACCEPT
 238
 239         # Filter all packets with loopback addresses on non-loopback interfaces (spoofed)
 240         iptables -A LOOPBACK -s 127.0.0.0/8 -j SPOOFED_MARTIAN
 241         iptables -A LOOPBACK -d 127.0.0.0/8 -j SPOOFED_MARTIAN
 242
 243         for i in INPUT FORWARD OUTPUT; do
 244                 iptables -A ${i} -j LOOPBACK
 245         done
 246
 247         # Captive portal
 248         iptables -N CAPTIVE_PORTAL
 249         iptables -N CAPTIVE_PORTAL_CLIENTS
 250         for i in INPUT FORWARD; do
 251                 iptables -A ${i} -j CAPTIVE_PORTAL
 252         done
 253
 254         # Accept everything connected
 255         for i in INPUT FORWARD OUTPUT; do
 256                 iptables -A ${i} -j CONNTRACK
 257         done
 258
 259         # Allow DHCP
 260         iptables -N DHCPINPUT
 261         iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
 262         iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
 263
 264         iptables -N DHCPOUTPUT
 265         iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
 266         iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
 267
 268         # Allow DHCP on GREEN
 269         iptables -N DHCPGREENINPUT
 270         iptables -N DHCPGREENOUTPUT
 271         if [ -n "${GREEN_DEV}" ]; then
 272                 iptables -A INPUT  -i "${GREEN_DEV}" -j DHCPGREENINPUT
 273                 iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
 274         fi
 275
 276         # Allow DHCP on BLUE to be turned on/off
 277         iptables -N DHCPBLUEINPUT
 278         iptables -N DHCPBLUEOUTPUT
 279         if [ -n "${BLUE_DEV}" ]; then
 280                 iptables -A INPUT  -i "${BLUE_DEV}" -j DHCPBLUEINPUT
 281                 iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
 282         fi
 283
 284         # Tor (inbound)
 285         iptables -N TOR_INPUT
 286         iptables -A INPUT -j TOR_INPUT
 287
 288         # Location Block
 289         iptables -N LOCATIONBLOCK
 290         iptables -A INPUT -j LOCATIONBLOCK
 291         iptables -A FORWARD -j LOCATIONBLOCK
 292
 293         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 294         iptables -N IPSECINPUT
 295         iptables -N IPSECFORWARD
 296         iptables -N IPSECOUTPUT
 297         iptables -A INPUT -j IPSECINPUT
 298         iptables -A FORWARD -j IPSECFORWARD
 299         iptables -A OUTPUT -j IPSECOUTPUT
 300         iptables -t nat -N IPSECNAT
 301         iptables -t nat -A POSTROUTING -j IPSECNAT
 302
 303         # localhost and ethernet.
 304         # Always allow accessing the web GUI from GREEN.
 305         iptables -N GUIINPUT
 306         iptables -A INPUT -j GUIINPUT
 307         if [ -n "${GREEN_DEV}" ]; then
 308                 iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
 309         fi
 310
 311         # WIRELESS chains
 312         iptables -N WIRELESSINPUT
 313         iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
 314         iptables -N WIRELESSFORWARD
 315         iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
 316
 317         # OpenVPN
 318         iptables -N OVPNINPUT
 319         iptables -A INPUT -j OVPNINPUT
 320
 321         # Tor (outbound)
 322         iptables -N TOR_OUTPUT
 323         iptables -A OUTPUT -j TOR_OUTPUT
 324
 325         # Jump into the actual firewall ruleset.
 326         iptables -N INPUTFW
 327         iptables -A INPUT -j INPUTFW
 328
 329         iptables -N OUTGOINGFW
 330         iptables -A OUTPUT -j OUTGOINGFW
 331
 332         iptables -N FORWARDFW
 333         iptables -A FORWARD -j FORWARDFW
 334
 335         # SNAT rules
 336         iptables -t nat -N NAT_SOURCE
 337         iptables -t nat -A POSTROUTING -j NAT_SOURCE
 338
 339         # Captive Portal
 340         iptables -t nat -N CAPTIVE_PORTAL
 341         iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL
 342
 343         # Custom prerouting chains (for transparent proxy)
 344         iptables -t nat -N SQUID
 345         iptables -t nat -A PREROUTING -j SQUID
 346
 347         # DNAT rules
 348         iptables -t nat -N NAT_DESTINATION
 349         iptables -t nat -A PREROUTING -j NAT_DESTINATION
 350         iptables -t nat -A OUTPUT -j NAT_DESTINATION
 351
 352         iptables -t mangle -N NAT_DESTINATION
 353         iptables -t mangle -A PREROUTING -j NAT_DESTINATION
 354
 355         iptables -t nat -N NAT_DESTINATION_FIX
 356         iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
 357
 358         if [ -n "${GREEN_ADDRESS}" ]; then
 359                 iptables -t nat -A NAT_DESTINATION_FIX \
 360                         -m mark --mark "0x01000000/${NAT_MASK}" -j SNAT --to-source "${GREEN_ADDRESS}"
 361         fi
 362
 363         if [ -n "${BLUE_ADDRESS}" ]; then
 364                 iptables -t nat -A NAT_DESTINATION_FIX \
 365                         -m mark --mark "0x02000000/${NAT_MASK}" -j SNAT --to-source "${BLUE_ADDRESS}"
 366         fi
 367
 368         if [ -n "${ORANGE_ADDRESS}" ]; then
 369                 iptables -t nat -A NAT_DESTINATION_FIX \
 370                         -m mark --mark "0x04000000/${NAT_MASK}" -j SNAT --to-source "${ORANGE_ADDRESS}"
 371         fi
 372
 373         # RED chain, used for the red interface
 374         iptables -N REDINPUT
 375         iptables -A INPUT -j REDINPUT
 376         iptables -N REDFORWARD
 377         iptables -A FORWARD -j REDFORWARD
 378         iptables -t nat -N REDNAT
 379         iptables -t nat -A POSTROUTING -j REDNAT
 380
 381         # Populate IPsec chains
 382         /usr/lib/firewall/ipsec-policy
 383
 384         # Apply OpenVPN firewall rules
 385         /usr/local/bin/openvpnctrl --firewall-rules
 386
 387         # run wirelessctrl
 388         /usr/local/bin/wirelessctrl
 389
 390         # run captivectrl
 391         /usr/local/bin/captivectrl
 392
 393         # If a Tor relay is enabled apply firewall rules
 394         if [ "${TOR_RELAY_ENABLED}" = "on" -a -n "${TOR_RELAY_PORT}" ]; then
 395                 /usr/local/bin/torctrl restart 1> /dev/null
 396         fi
 397
 398         # POLICY CHAIN
 399         iptables -N POLICYIN
 400         iptables -A INPUT -j POLICYIN
 401         iptables -N POLICYFWD
 402         iptables -A FORWARD -j POLICYFWD
 403         iptables -N POLICYOUT
 404         iptables -A OUTPUT -j POLICYOUT
 405
 406         # Initialize firewall policies.
 407         /usr/sbin/firewall-policy
 408
 409         # Install firewall rules for the red interface.
 410         iptables_red_up
 411
 412         # If red has not been brought up yet, we will
 413         # add the blocking rules for MASQUERADE
 414         if [ ! -e "/var/ipfire/red/active" ]; then
 415                 iptables_red_down
 416         fi
 417 }
 418
 419 iptables_red_up() {
 420         iptables -F REDINPUT
 421         iptables -F REDFORWARD
 422         iptables -t nat -F REDNAT
 423
 424         # Prohibit spoofing our own IP address on RED
 425         if [ -f /var/ipfire/red/active ]; then
 426                 REDIP="$( cat /var/ipfire/red/local-ipaddress )";
 427
 428                 if [ "$IFACE" != "" ]; then
 429                         iptables -A REDINPUT -s $REDIP -i $IFACE -j SPOOFED_MARTIAN
 430                 elif [ "$DEVICE" != "" ]; then
 431                         iptables -A REDINPUT -s $REDIP -i $DEVICE -j SPOOFED_MARTIAN
 432                 fi
 433         fi
 434
 435         # PPTP over DHCP
 436         if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
 437                 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 438                 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 439         fi
 440
 441         if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
 442                 # DHCP
 443                 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 444                         iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 445                         iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 446                 fi
 447                 if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
 448                         iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 449                         iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 450                 fi
 451
 452                 # Outgoing masquerading (don't masqerade IPsec)
 453                 iptables -t nat -A REDNAT -m policy --pol ipsec --dir=out -o "${IFACE}" -j RETURN
 454
 455                 if [ "${IFACE}" = "${GREEN_DEV}" ]; then
 456                         iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
 457                 fi
 458
 459                 local NO_MASQ_NETWORKS
 460
 461                 if [ "${MASQUERADE_GREEN}" = "off" ]; then
 462                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
 463                 fi
 464
 465                 if [ "${MASQUERADE_BLUE}" = "off" ]; then
 466                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
 467                 fi
 468
 469                 if [ "${MASQUERADE_ORANGE}" = "off" ]; then
 470                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
 471                 fi
 472
 473                 local network
 474                 for network in ${NO_MASQ_NETWORKS}; do
 475                         iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
 476                 done
 477
 478                 # Masquerade everything else
 479                 iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
 480         fi
 481
 482         # Reload all rules.
 483         /usr/local/bin/firewallctrl
 484 }
 485
 486 iptables_red_down() {
 487         # Prohibit packets to reach the masquerading rule
 488         # while the WAN interface is down - this is required to
 489         # circumvent udp related NAT issues
 490         # http://forum.ipfire.org/index.php?topic=11127.0
 491         if [ -n "${IFACE}" ]; then
 492                 iptables -F REDFORWARD
 493                 iptables -A REDFORWARD -o "${IFACE}" -j DROP
 494         fi
 495
 496         # Reload all rules.
 497         /usr/local/bin/firewallctrl
 498 }
 499
 500 # See how we were called.
 501 case "$1" in
 502   start)
 503         boot_mesg "Setting up firewall"
 504         iptables_init
 505         evaluate_retval
 506         ;;
 507   reload|up)
 508         boot_mesg "Reloading firewall"
 509         iptables_red_up
 510         evaluate_retval
 511         ;;
 512   down)
 513         boot_mesg "Disabling firewall access to RED"
 514         iptables_red_down
 515         evaluate_retval
 516         ;;
 517   restart)
 518         $0 start
 519         ;;
 520   *)
 521         echo "Usage: $0 {start|reload|restart}"
 522         exit 1
 523         ;;
 524 esac
 525
 526 exit 0