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_IN
 183         if [ "$LOGDROPHOSTILEIN" == "on" ]; then
 184                 iptables -A HOSTILE_DROP_IN -m limit --limit 10/second -j LOG --log-prefix "DROP_HOSTILE "
 185         fi
 186         iptables -A HOSTILE_DROP_IN -j DROP -m comment --comment "DROP_HOSTILE"
 187
 188         iptables -N HOSTILE_DROP_OUT
 189         if [ "$LOGDROPHOSTILEOUT" == "on" ]; then
 190                 iptables -A HOSTILE_DROP_OUT -m limit --limit 10/second -j LOG --log-prefix "DROP_HOSTILE "
 191         fi
 192         iptables -A HOSTILE_DROP_OUT -j DROP -m comment --comment "DROP_HOSTILE"
 193
 194
 195         # IP Address Blocklist chains
 196         iptables -N BLOCKLISTIN
 197         iptables -N BLOCKLISTOUT
 198         iptables -A INPUT ! -p icmp -j BLOCKLISTIN
 199         iptables -A FORWARD ! -p icmp -j BLOCKLISTIN
 200         iptables -A FORWARD ! -p icmp -j BLOCKLISTOUT
 201         iptables -A OUTPUT ! -p icmp -j BLOCKLISTOUT
 202
 203         # IPS (Guardian) chains
 204         iptables -N GUARDIAN
 205         iptables -A INPUT -j GUARDIAN
 206         iptables -A FORWARD -j GUARDIAN
 207
 208         # Block non-established IPsec networks
 209         iptables -N IPSECBLOCK
 210         iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
 211         iptables -A OUTPUT  -m policy --dir out --pol none -j IPSECBLOCK
 212
 213         # Block OpenVPN transfer networks
 214         iptables -N OVPNBLOCK
 215         iptables -A INPUT   -i tun+ -j OVPNBLOCK
 216         iptables -A FORWARD -i tun+ -j OVPNBLOCK
 217         iptables -A FORWARD -o tun+ -j OVPNBLOCK
 218
 219         # IPS (Suricata) chains
 220         iptables -N IPS_INPUT
 221         iptables -N IPS_FORWARD
 222         iptables -N IPS_OUTPUT
 223
 224         for chain in INPUT FORWARD OUTPUT; do
 225                 iptables -A "${chain}" -m mark --mark "0x0/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j "IPS_${chain}"
 226         done
 227
 228         # OpenVPN transfer network translation
 229         iptables -t nat -N OVPNNAT
 230         iptables -t nat -A POSTROUTING -j OVPNNAT
 231
 232         # IPTV chains for IGMPPROXY
 233         iptables -N IPTVINPUT
 234         iptables -A INPUT -j IPTVINPUT
 235         iptables -N IPTVFORWARD
 236         iptables -A FORWARD -j IPTVFORWARD
 237
 238         # Allow to ping the firewall.
 239         iptables -N ICMPINPUT
 240         iptables -A INPUT -j ICMPINPUT
 241         iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
 242
 243         # Accept everything on loopback
 244         iptables -N LOOPBACK
 245         iptables -A LOOPBACK -i lo -j ACCEPT
 246         iptables -A LOOPBACK -o lo -j ACCEPT
 247
 248         # Filter all packets with loopback addresses on non-loopback interfaces (spoofed)
 249         iptables -A LOOPBACK -s 127.0.0.0/8 -j SPOOFED_MARTIAN
 250         iptables -A LOOPBACK -d 127.0.0.0/8 -j SPOOFED_MARTIAN
 251
 252         for i in INPUT FORWARD OUTPUT; do
 253                 iptables -A ${i} -j LOOPBACK
 254         done
 255
 256         # Captive portal
 257         iptables -N CAPTIVE_PORTAL
 258         iptables -N CAPTIVE_PORTAL_CLIENTS
 259         for i in INPUT FORWARD; do
 260                 iptables -A ${i} -j CAPTIVE_PORTAL
 261         done
 262
 263         # Accept everything connected
 264         for i in INPUT FORWARD OUTPUT; do
 265                 iptables -A ${i} -j CONNTRACK
 266         done
 267
 268         # Allow DHCP
 269         iptables -N DHCPINPUT
 270         iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
 271         iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
 272
 273         iptables -N DHCPOUTPUT
 274         iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
 275         iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
 276
 277         # Allow DHCP on GREEN
 278         iptables -N DHCPGREENINPUT
 279         iptables -N DHCPGREENOUTPUT
 280         if [ -n "${GREEN_DEV}" ]; then
 281                 iptables -A INPUT  -i "${GREEN_DEV}" -j DHCPGREENINPUT
 282                 iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
 283         fi
 284
 285         # Allow DHCP on BLUE to be turned on/off
 286         iptables -N DHCPBLUEINPUT
 287         iptables -N DHCPBLUEOUTPUT
 288         if [ -n "${BLUE_DEV}" ]; then
 289                 iptables -A INPUT  -i "${BLUE_DEV}" -j DHCPBLUEINPUT
 290                 iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
 291         fi
 292
 293         # Tor (inbound)
 294         iptables -N TOR_INPUT
 295         iptables -A INPUT -j TOR_INPUT
 296
 297         # Location Block
 298         iptables -N LOCATIONBLOCK
 299         iptables -A INPUT -j LOCATIONBLOCK
 300         iptables -A FORWARD -j LOCATIONBLOCK
 301
 302         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 303         iptables -N IPSECINPUT
 304         iptables -N IPSECFORWARD
 305         iptables -N IPSECOUTPUT
 306         iptables -A INPUT -j IPSECINPUT
 307         iptables -A FORWARD -j IPSECFORWARD
 308         iptables -A OUTPUT -j IPSECOUTPUT
 309         iptables -t nat -N IPSECNAT
 310         iptables -t nat -A POSTROUTING -j IPSECNAT
 311
 312         # localhost and ethernet.
 313         # Always allow accessing the web GUI from GREEN.
 314         iptables -N GUIINPUT
 315         iptables -A INPUT -j GUIINPUT
 316         if [ -n "${GREEN_DEV}" ]; then
 317                 iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
 318         fi
 319
 320         # WIRELESS chains
 321         iptables -N WIRELESSINPUT
 322         iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
 323         iptables -N WIRELESSFORWARD
 324         iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
 325
 326         # OpenVPN
 327         iptables -N OVPNINPUT
 328         iptables -A INPUT -j OVPNINPUT
 329
 330         # Tor (outbound)
 331         iptables -N TOR_OUTPUT
 332         iptables -A OUTPUT -j TOR_OUTPUT
 333
 334         # Jump into the actual firewall ruleset.
 335         iptables -N INPUTFW
 336         iptables -A INPUT -j INPUTFW
 337
 338         iptables -N OUTGOINGFW
 339         iptables -A OUTPUT -j OUTGOINGFW
 340
 341         iptables -N FORWARDFW
 342         iptables -A FORWARD -j FORWARDFW
 343
 344         # SNAT rules
 345         iptables -t nat -N NAT_SOURCE
 346         iptables -t nat -A POSTROUTING -j NAT_SOURCE
 347
 348         # Captive Portal
 349         iptables -t nat -N CAPTIVE_PORTAL
 350         iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL
 351
 352         # Custom prerouting chains (for transparent proxy)
 353         iptables -t nat -N SQUID
 354         iptables -t nat -A PREROUTING -j SQUID
 355
 356         # DNAT rules
 357         iptables -t nat -N NAT_DESTINATION
 358         iptables -t nat -A PREROUTING -j NAT_DESTINATION
 359         iptables -t nat -A OUTPUT -j NAT_DESTINATION
 360
 361         iptables -t mangle -N NAT_DESTINATION
 362         iptables -t mangle -A PREROUTING -j NAT_DESTINATION
 363
 364         iptables -t nat -N NAT_DESTINATION_FIX
 365         iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
 366
 367         if [ -n "${GREEN_ADDRESS}" ]; then
 368                 iptables -t nat -A NAT_DESTINATION_FIX \
 369                         -m mark --mark "0x01000000/${NAT_MASK}" -j SNAT --to-source "${GREEN_ADDRESS}"
 370         fi
 371
 372         if [ -n "${BLUE_ADDRESS}" ]; then
 373                 iptables -t nat -A NAT_DESTINATION_FIX \
 374                         -m mark --mark "0x02000000/${NAT_MASK}" -j SNAT --to-source "${BLUE_ADDRESS}"
 375         fi
 376
 377         if [ -n "${ORANGE_ADDRESS}" ]; then
 378                 iptables -t nat -A NAT_DESTINATION_FIX \
 379                         -m mark --mark "0x04000000/${NAT_MASK}" -j SNAT --to-source "${ORANGE_ADDRESS}"
 380         fi
 381
 382         # RED chain, used for the red interface
 383         iptables -N REDINPUT
 384         iptables -A INPUT -j REDINPUT
 385         iptables -N REDFORWARD
 386         iptables -A FORWARD -j REDFORWARD
 387         iptables -t nat -N REDNAT
 388         iptables -t nat -A POSTROUTING -j REDNAT
 389
 390         # Populate IPsec chains
 391         /usr/lib/firewall/ipsec-policy
 392
 393         # Apply OpenVPN firewall rules
 394         /usr/local/bin/openvpnctrl --firewall-rules
 395
 396         # run wirelessctrl
 397         /usr/local/bin/wirelessctrl
 398
 399         # run captivectrl
 400         /usr/local/bin/captivectrl
 401
 402         # If a Tor relay is enabled apply firewall rules
 403         if [ "${TOR_RELAY_ENABLED}" = "on" -a -n "${TOR_RELAY_PORT}" ]; then
 404                 /usr/local/bin/torctrl restart 1> /dev/null
 405         fi
 406
 407         # POLICY CHAIN
 408         iptables -N POLICYIN
 409         iptables -A INPUT -j POLICYIN
 410         iptables -N POLICYFWD
 411         iptables -A FORWARD -j POLICYFWD
 412         iptables -N POLICYOUT
 413         iptables -A OUTPUT -j POLICYOUT
 414
 415         # Initialize firewall policies.
 416         /usr/sbin/firewall-policy
 417
 418         # Install firewall rules for the red interface.
 419         iptables_red_up
 420
 421         # If red has not been brought up yet, we will
 422         # add the blocking rules for MASQUERADE
 423         if [ ! -e "/var/ipfire/red/active" ]; then
 424                 iptables_red_down
 425         fi
 426 }
 427
 428 iptables_red_up() {
 429         iptables -F REDINPUT
 430         iptables -F REDFORWARD
 431         iptables -t nat -F REDNAT
 432
 433         # Prohibit spoofing our own IP address on RED
 434         if [ -f /var/ipfire/red/active ]; then
 435                 REDIP="$( cat /var/ipfire/red/local-ipaddress )";
 436
 437                 if [ "$IFACE" != "" ]; then
 438                         iptables -A REDINPUT -s $REDIP -i $IFACE -j SPOOFED_MARTIAN
 439                 elif [ "$DEVICE" != "" ]; then
 440                         iptables -A REDINPUT -s $REDIP -i $DEVICE -j SPOOFED_MARTIAN
 441                 fi
 442         fi
 443
 444         # PPTP over DHCP
 445         if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
 446                 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 447                 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 448         fi
 449
 450         if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
 451                 # DHCP
 452                 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 453                         iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 454                         iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 455                 fi
 456                 if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
 457                         iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 458                         iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 459                 fi
 460
 461                 # Outgoing masquerading (don't masqerade IPsec)
 462                 iptables -t nat -A REDNAT -m policy --pol ipsec --dir=out -o "${IFACE}" -j RETURN
 463
 464                 if [ "${IFACE}" = "${GREEN_DEV}" ]; then
 465                         iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
 466                 fi
 467
 468                 local NO_MASQ_NETWORKS
 469
 470                 if [ "${MASQUERADE_GREEN}" = "off" ]; then
 471                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
 472                 fi
 473
 474                 if [ "${MASQUERADE_BLUE}" = "off" ]; then
 475                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
 476                 fi
 477
 478                 if [ "${MASQUERADE_ORANGE}" = "off" ]; then
 479                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
 480                 fi
 481
 482                 local network
 483                 for network in ${NO_MASQ_NETWORKS}; do
 484                         iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
 485                 done
 486
 487                 # Masquerade everything else
 488                 iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
 489         fi
 490
 491         # Reload all rules.
 492         /usr/local/bin/firewallctrl
 493 }
 494
 495 iptables_red_down() {
 496         # Prohibit packets to reach the masquerading rule
 497         # while the WAN interface is down - this is required to
 498         # circumvent udp related NAT issues
 499         # http://forum.ipfire.org/index.php?topic=11127.0
 500         if [ -n "${IFACE}" ]; then
 501                 iptables -F REDFORWARD
 502                 iptables -A REDFORWARD -o "${IFACE}" -j DROP
 503         fi
 504
 505         # Reload all rules.
 506         /usr/local/bin/firewallctrl
 507 }
 508
 509 # See how we were called.
 510 case "$1" in
 511   start)
 512         boot_mesg "Setting up firewall"
 513         iptables_init
 514         evaluate_retval
 515         ;;
 516   reload|up)
 517         boot_mesg "Reloading firewall"
 518         iptables_red_up
 519         evaluate_retval
 520         ;;
 521   down)
 522         boot_mesg "Disabling firewall access to RED"
 523         iptables_red_down
 524         evaluate_retval
 525         ;;
 526   restart)
 527         $0 start
 528         ;;
 529   *)
 530         echo "Usage: $0 {start|reload|restart}"
 531         exit 1
 532         ;;
 533 esac
 534
 535 exit 0