src/initscripts/system/firewall

   1 #!/bin/sh
   2
   3 . /etc/sysconfig/rc
   4 . ${rc_functions}
   5
   6 eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
   7 eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
   8 eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
   9 IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
  10 if [ -z $IFACE ]; then
  11         IFACE="red0"
  12 fi
  13
  14 if [ -f /var/ipfire/red/device ]; then
  15         DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
  16 fi
  17
  18 NAT_MASK="0x0f000000"
  19
  20 IPS_REPEAT_MARK="0x80000000"
  21 IPS_REPEAT_MASK="0x80000000"
  22 IPS_BYPASS_MARK="0x40000000"
  23 IPS_BYPASS_MASK="0x40000000"
  24
  25 IPSET_DB_DIR="/var/lib/location/ipset"
  26
  27 function iptables() {
  28         /sbin/iptables --wait "$@"
  29 }
  30
  31 iptables_init() {
  32         # Flush all rules and delete all custom chains
  33         iptables -F
  34         iptables -t nat -F
  35         iptables -t mangle -F
  36         iptables -t raw -F
  37         iptables -X
  38         iptables -t nat -X
  39         iptables -t mangle -X
  40         iptables -t raw -X
  41
  42         # Set up policies
  43         iptables -P INPUT DROP
  44         iptables -P FORWARD DROP
  45         iptables -P OUTPUT ACCEPT
  46
  47         # Enable TRACE logging to syslog
  48         modprobe nf_log_ipv4
  49         sysctl -q -w net.netfilter.nf_log.2=nf_log_ipv4
  50
  51         # IPS Bypass Chain which stores the BYPASS bit in connection tracking
  52         iptables -N IPSBYPASS
  53         iptables -A IPSBYPASS -j CONNMARK --save-mark --mask "$(( ~IPS_REPEAT_MASK & 0xffffffff ))"
  54
  55         # Jump into bypass chain when the BYPASS bit is set
  56         for chain in INPUT FORWARD OUTPUT; do
  57                 iptables -A "${chain}" -m mark \
  58                         --mark "$(( IPS_REPEAT_MARK | IPS_BYPASS_MARK ))/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j IPSBYPASS
  59         done
  60
  61         # Empty LOG_DROP and LOG_REJECT chains
  62         iptables -N LOG_DROP
  63         iptables -A LOG_DROP   -m limit --limit 10/second -j LOG
  64         iptables -A LOG_DROP   -j DROP
  65         iptables -N LOG_REJECT
  66         iptables -A LOG_REJECT -m limit --limit 10/second -j LOG
  67         iptables -A LOG_REJECT -j REJECT
  68
  69         # This chain will log, then DROPs packets with certain bad combinations
  70         # of flags might indicate a port-scan attempt (xmas, null, etc.)
  71         iptables -N PSCAN
  72         if [ "$DROPPORTSCAN" == "on" ]; then
  73                 iptables -A PSCAN -p tcp  -m limit --limit 10/second -j LOG --log-prefix "DROP_TCP Scan "  -m comment --comment "DROP_TCP PScan"
  74                 iptables -A PSCAN -p udp  -m limit --limit 10/second -j LOG --log-prefix "DROP_UDP Scan "  -m comment --comment "DROP_UDP PScan"
  75                 iptables -A PSCAN -p icmp -m limit --limit 10/second -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
  76                 iptables -A PSCAN -f      -m limit --limit 10/second -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
  77         fi
  78         iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
  79
  80         # New tcp packets without SYN set - could well be an obscure type of port scan
  81         # that's not covered above, may just be a broken Windows machine
  82         iptables -N NEWNOTSYN
  83         if [ "$DROPNEWNOTSYN" == "on" ]; then
  84                 iptables -A NEWNOTSYN  -m limit --limit 10/second -j LOG  --log-prefix "DROP_NEWNOTSYN "
  85         fi
  86         iptables -A NEWNOTSYN  -j DROP -m comment --comment "DROP_NEWNOTSYN"
  87
  88         # Log and subsequently drop spoofed packets or "martians", arriving from sources
  89         # on interfaces where we don't expect them
  90         iptables -N SPOOFED_MARTIAN
  91         if [ "$DROPSPOOFEDMARTIAN" == "on" ]; then
  92                 iptables -A SPOOFED_MARTIAN  -m limit --limit 10/second -j LOG  --log-prefix "DROP_SPOOFED_MARTIAN "
  93         fi
  94         iptables -A SPOOFED_MARTIAN -j DROP -m comment --comment "DROP_SPOOFED_MARTIAN"
  95
  96         # Chain to contain all the rules relating to bad TCP flags
  97         iptables -N BADTCP
  98
  99         # Don't check loopback
 100         iptables -A BADTCP -i lo -j RETURN
 101
 102         # Disallow packets frequently used by port-scanners
 103         # NMAP FIN/URG/PSH (XMAS scan)
 104         iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
 105         # SYN/RST/ACK/FIN/URG
 106         iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
 107         # ALL/ALL
 108         iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
 109         # FIN Stealth
 110         iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
 111         # SYN/RST (also catches xmas variants that set SYN+RST+...)
 112         iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
 113         # SYN/FIN (QueSO or nmap OS probe)
 114         iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
 115         # Null
 116         iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
 117         # NEW TCP without SYN
 118         iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
 119
 120         iptables -A INPUT   -p tcp -j BADTCP
 121         iptables -A FORWARD -p tcp -j BADTCP
 122
 123         # Connection tracking chains
 124         iptables -N CTINVALID
 125         iptables -A CTINVALID  -m limit --limit 10/second -j LOG  --log-prefix "DROP_CTINVALID "
 126         iptables -A CTINVALID  -j DROP -m comment --comment "DROP_CTINVALID"
 127
 128         iptables -N CONNTRACK
 129         iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
 130         iptables -A CONNTRACK -m conntrack --ctstate INVALID -j CTINVALID
 131         iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
 132
 133         # Restore any connection marks
 134         iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
 135
 136         # Fix for braindead ISPs
 137         iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
 138
 139         # CUSTOM chains, can be used by the users themselves
 140         iptables -N CUSTOMINPUT
 141         iptables -A INPUT -j CUSTOMINPUT
 142         iptables -N CUSTOMFORWARD
 143         iptables -A FORWARD -j CUSTOMFORWARD
 144         iptables -N CUSTOMOUTPUT
 145         iptables -A OUTPUT -j CUSTOMOUTPUT
 146         iptables -t nat -N CUSTOMPREROUTING
 147         iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
 148         iptables -t nat -N CUSTOMPOSTROUTING
 149         iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
 150
 151         # Log and drop any traffic from and to networks known as being hostile, posing
 152         # a technical threat to our users (i. e. listed at Spamhaus DROP et al.)
 153         iptables -N HOSTILE
 154         if [ "$DROPHOSTILE" == "on" ]; then
 155                 # Call ipset and load the list which contains the hostile networks.
 156                 ipset restore < $IPSET_DB_DIR/CC_XD.ipset4
 157
 158                 iptables -A HOSTILE -m limit --limit 10/second -j LOG  --log-prefix "DROP_HOSTILE "
 159                 iptables -A INPUT   -i $IFACE -m set --match-set CC_XD src -j HOSTILE
 160                 iptables -A FORWARD -i $IFACE -m set --match-set CC_XD src -j HOSTILE
 161                 iptables -A FORWARD -o $IFACE -m set --match-set CC_XD dst -j HOSTILE
 162                 iptables -A OUTPUT  -o $IFACE -m set --match-set CC_XD src -j HOSTILE
 163         fi
 164         iptables -A HOSTILE -j DROP -m comment --comment "DROP_HOSTILE"
 165
 166         # IPS (Guardian) chains
 167         iptables -N GUARDIAN
 168         iptables -A INPUT -j GUARDIAN
 169         iptables -A FORWARD -j GUARDIAN
 170
 171         # Block non-established IPsec networks
 172         iptables -N IPSECBLOCK
 173         iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
 174         iptables -A OUTPUT  -m policy --dir out --pol none -j IPSECBLOCK
 175
 176         # Block OpenVPN transfer networks
 177         iptables -N OVPNBLOCK
 178         iptables -A INPUT   -i tun+ -j OVPNBLOCK
 179         iptables -A FORWARD -i tun+ -j OVPNBLOCK
 180         iptables -A FORWARD -o tun+ -j OVPNBLOCK
 181
 182         # IPS (Suricata) chains
 183         iptables -N IPS_INPUT
 184         iptables -N IPS_FORWARD
 185         iptables -N IPS_OUTPUT
 186
 187         for chain in INPUT FORWARD OUTPUT; do
 188                 iptables -A "${chain}" -m mark --mark "0x0/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j "IPS_${chain}"
 189         done
 190
 191         # OpenVPN transfer network translation
 192         iptables -t nat -N OVPNNAT
 193         iptables -t nat -A POSTROUTING -j OVPNNAT
 194
 195         # IPTV chains for IGMPPROXY
 196         iptables -N IPTVINPUT
 197         iptables -A INPUT -j IPTVINPUT
 198         iptables -N IPTVFORWARD
 199         iptables -A FORWARD -j IPTVFORWARD
 200
 201         # Allow to ping the firewall.
 202         iptables -N ICMPINPUT
 203         iptables -A INPUT -j ICMPINPUT
 204         iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
 205
 206         # Accept everything on loopback
 207         iptables -N LOOPBACK
 208         iptables -A LOOPBACK -i lo -j ACCEPT
 209         iptables -A LOOPBACK -o lo -j ACCEPT
 210
 211         # Filter all packets with loopback addresses on non-loopback interfaces (spoofed)
 212         iptables -A LOOPBACK -s 127.0.0.0/8 -j SPOOFED_MARTIAN
 213         iptables -A LOOPBACK -d 127.0.0.0/8 -j SPOOFED_MARTIAN
 214
 215         for i in INPUT FORWARD OUTPUT; do
 216                 iptables -A ${i} -j LOOPBACK
 217         done
 218
 219         # Captive portal
 220         iptables -N CAPTIVE_PORTAL
 221         iptables -N CAPTIVE_PORTAL_CLIENTS
 222         for i in INPUT FORWARD; do
 223                 iptables -A ${i} -j CAPTIVE_PORTAL
 224         done
 225
 226         # Accept everything connected
 227         for i in INPUT FORWARD OUTPUT; do
 228                 iptables -A ${i} -j CONNTRACK
 229         done
 230
 231         # Allow DHCP
 232         iptables -N DHCPINPUT
 233         iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
 234         iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
 235
 236         iptables -N DHCPOUTPUT
 237         iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
 238         iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
 239
 240         # Allow DHCP on GREEN
 241         iptables -N DHCPGREENINPUT
 242         iptables -N DHCPGREENOUTPUT
 243         if [ -n "${GREEN_DEV}" ]; then
 244                 iptables -A INPUT  -i "${GREEN_DEV}" -j DHCPGREENINPUT
 245                 iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
 246         fi
 247
 248         # Allow DHCP on BLUE to be turned on/off
 249         iptables -N DHCPBLUEINPUT
 250         iptables -N DHCPBLUEOUTPUT
 251         if [ -n "${BLUE_DEV}" ]; then
 252                 iptables -A INPUT  -i "${BLUE_DEV}" -j DHCPBLUEINPUT
 253                 iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
 254         fi
 255
 256         # Tor (inbound)
 257         iptables -N TOR_INPUT
 258         iptables -A INPUT -j TOR_INPUT
 259
 260         # Location Block
 261         iptables -N LOCATIONBLOCK
 262         iptables -A INPUT -j LOCATIONBLOCK
 263         iptables -A FORWARD -j LOCATIONBLOCK
 264
 265         # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
 266         iptables -N IPSECINPUT
 267         iptables -N IPSECFORWARD
 268         iptables -N IPSECOUTPUT
 269         iptables -A INPUT -j IPSECINPUT
 270         iptables -A FORWARD -j IPSECFORWARD
 271         iptables -A OUTPUT -j IPSECOUTPUT
 272         iptables -t nat -N IPSECNAT
 273         iptables -t nat -A POSTROUTING -j IPSECNAT
 274
 275         # localhost and ethernet.
 276         # Always allow accessing the web GUI from GREEN.
 277         iptables -N GUIINPUT
 278         iptables -A INPUT -j GUIINPUT
 279         if [ -n "${GREEN_DEV}" ]; then
 280                 iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
 281         fi
 282
 283         # WIRELESS chains
 284         iptables -N WIRELESSINPUT
 285         iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
 286         iptables -N WIRELESSFORWARD
 287         iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
 288
 289         # OpenVPN
 290         iptables -N OVPNINPUT
 291         iptables -A INPUT -j OVPNINPUT
 292
 293         # Tor (outbound)
 294         iptables -N TOR_OUTPUT
 295         iptables -A OUTPUT -j TOR_OUTPUT
 296
 297         # Jump into the actual firewall ruleset.
 298         iptables -N INPUTFW
 299         iptables -A INPUT -j INPUTFW
 300
 301         iptables -N OUTGOINGFW
 302         iptables -A OUTPUT -j OUTGOINGFW
 303
 304         iptables -N FORWARDFW
 305         iptables -A FORWARD -j FORWARDFW
 306
 307         # SNAT rules
 308         iptables -t nat -N NAT_SOURCE
 309         iptables -t nat -A POSTROUTING -j NAT_SOURCE
 310
 311         # Captive Portal
 312         iptables -t nat -N CAPTIVE_PORTAL
 313         iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL
 314
 315         # Custom prerouting chains (for transparent proxy)
 316         iptables -t nat -N SQUID
 317         iptables -t nat -A PREROUTING -j SQUID
 318
 319         # DNAT rules
 320         iptables -t nat -N NAT_DESTINATION
 321         iptables -t nat -A PREROUTING -j NAT_DESTINATION
 322         iptables -t nat -A OUTPUT -j NAT_DESTINATION
 323
 324         iptables -t mangle -N NAT_DESTINATION
 325         iptables -t mangle -A PREROUTING -j NAT_DESTINATION
 326
 327         iptables -t nat -N NAT_DESTINATION_FIX
 328         iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
 329
 330         if [ -n "${GREEN_ADDRESS}" ]; then
 331                 iptables -t nat -A NAT_DESTINATION_FIX \
 332                         -m mark --mark "0x01000000/${NAT_MASK}" -j SNAT --to-source "${GREEN_ADDRESS}"
 333         fi
 334
 335         if [ -n "${BLUE_ADDRESS}" ]; then
 336                 iptables -t nat -A NAT_DESTINATION_FIX \
 337                         -m mark --mark "0x02000000/${NAT_MASK}" -j SNAT --to-source "${BLUE_ADDRESS}"
 338         fi
 339
 340         if [ -n "${ORANGE_ADDRESS}" ]; then
 341                 iptables -t nat -A NAT_DESTINATION_FIX \
 342                         -m mark --mark "0x04000000/${NAT_MASK}" -j SNAT --to-source "${ORANGE_ADDRESS}"
 343         fi
 344
 345         # RED chain, used for the red interface
 346         iptables -N REDINPUT
 347         iptables -A INPUT -j REDINPUT
 348         iptables -N REDFORWARD
 349         iptables -A FORWARD -j REDFORWARD
 350         iptables -t nat -N REDNAT
 351         iptables -t nat -A POSTROUTING -j REDNAT
 352
 353         # Populate IPsec chains
 354         /usr/lib/firewall/ipsec-policy
 355
 356         # Apply OpenVPN firewall rules
 357         /usr/local/bin/openvpnctrl --firewall-rules
 358
 359         # run wirelessctrl
 360         /usr/local/bin/wirelessctrl
 361
 362         # run captivectrl
 363         /usr/local/bin/captivectrl
 364
 365         # POLICY CHAIN
 366         iptables -N POLICYIN
 367         iptables -A INPUT -j POLICYIN
 368         iptables -N POLICYFWD
 369         iptables -A FORWARD -j POLICYFWD
 370         iptables -N POLICYOUT
 371         iptables -A OUTPUT -j POLICYOUT
 372
 373         # Initialize firewall policies.
 374         /usr/sbin/firewall-policy
 375
 376         # Install firewall rules for the red interface.
 377         iptables_red_up
 378
 379         # If red has not been brought up yet, we will
 380         # add the blocking rules for MASQUERADE
 381         if [ ! -e "/var/ipfire/red/active" ]; then
 382                 iptables_red_down
 383         fi
 384 }
 385
 386 iptables_red_up() {
 387         iptables -F REDINPUT
 388         iptables -F REDFORWARD
 389         iptables -t nat -F REDNAT
 390
 391         # Prohibit spoofing our own IP address on RED
 392         if [ -f /var/ipfire/red/active ]; then
 393                 REDIP="$( cat /var/ipfire/red/local-ipaddress )";
 394
 395                 if [ "$IFACE" != "" ]; then
 396                         iptables -A REDINPUT -s $REDIP -i $IFACE -j SPOOFED_MARTIAN
 397                 elif [ "$DEVICE" != "" ]; then
 398                         iptables -A REDINPUT -s $REDIP -i $DEVICE -j SPOOFED_MARTIAN
 399                 fi
 400         fi
 401
 402         # PPPoE / PPTP Device
 403         if [ "$IFACE" != "" ]; then
 404                 # PPPoE / PPTP
 405                 if [ "$DEVICE" != "" ]; then
 406                         iptables -A REDINPUT -i $DEVICE -j ACCEPT
 407                 fi
 408                 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
 409                         if [ "$RED_DEV" != "" ]; then
 410                                 iptables -A REDINPUT -i $RED_DEV -j ACCEPT
 411                         fi
 412                 fi
 413         fi
 414
 415         # PPTP over DHCP
 416         if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
 417                 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 418                 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
 419         fi
 420
 421         if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
 422                 # DHCP
 423                 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
 424                         iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 425                         iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 426                 fi
 427                 if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
 428                         iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 429                         iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
 430                 fi
 431
 432                 # Outgoing masquerading (don't masqerade IPsec)
 433                 iptables -t nat -A REDNAT -m policy --pol ipsec --dir=out -o "${IFACE}" -j RETURN
 434
 435                 if [ "${IFACE}" = "${GREEN_DEV}" ]; then
 436                         iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
 437                 fi
 438
 439                 local NO_MASQ_NETWORKS
 440
 441                 if [ "${MASQUERADE_GREEN}" = "off" ]; then
 442                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
 443                 fi
 444
 445                 if [ "${MASQUERADE_BLUE}" = "off" ]; then
 446                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
 447                 fi
 448
 449                 if [ "${MASQUERADE_ORANGE}" = "off" ]; then
 450                         NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
 451                 fi
 452
 453                 local network
 454                 for network in ${NO_MASQ_NETWORKS}; do
 455                         iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
 456                 done
 457
 458                 # Masquerade everything else
 459                 iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
 460         fi
 461
 462         # Reload all rules.
 463         /usr/local/bin/firewallctrl
 464 }
 465
 466 iptables_red_down() {
 467         # Prohibit packets to reach the masquerading rule
 468         # while the WAN interface is down - this is required to
 469         # circumvent udp related NAT issues
 470         # http://forum.ipfire.org/index.php?topic=11127.0
 471         if [ -n "${IFACE}" ]; then
 472                 iptables -F REDFORWARD
 473                 iptables -A REDFORWARD -o "${IFACE}" -j DROP
 474         fi
 475
 476         # Reload all rules.
 477         /usr/local/bin/firewallctrl
 478 }
 479
 480 # See how we were called.
 481 case "$1" in
 482   start)
 483         boot_mesg "Setting up firewall"
 484         iptables_init
 485         evaluate_retval
 486         ;;
 487   reload|up)
 488         boot_mesg "Reloading firewall"
 489         iptables_red_up
 490         evaluate_retval
 491         ;;
 492   down)
 493         boot_mesg "Disabling firewall access to RED"
 494         iptables_red_down
 495         evaluate_retval
 496         ;;
 497   restart)
 498         $0 start
 499         ;;
 500   *)
 501         echo "Usage: $0 {start|reload|restart}"
 502         exit 1
 503         ;;
 504 esac
 505
 506 exit 0