1 menu "Core Netfilter Configuration"
2 depends on NET && INET && NETFILTER
4 config NETFILTER_NETLINK
7 config NETFILTER_NETLINK_ACCT
8 tristate "Netfilter NFACCT over NFNETLINK interface"
9 depends on NETFILTER_ADVANCED
10 select NETFILTER_NETLINK
12 If this option is enabled, the kernel will include support
13 for extended accounting via NFNETLINK.
15 config NETFILTER_NETLINK_QUEUE
16 tristate "Netfilter NFQUEUE over NFNETLINK interface"
17 depends on NETFILTER_ADVANCED
18 select NETFILTER_NETLINK
20 If this option is enabled, the kernel will include support
21 for queueing packets via NFNETLINK.
23 config NETFILTER_NETLINK_LOG
24 tristate "Netfilter LOG over NFNETLINK interface"
25 default m if NETFILTER_ADVANCED=n
26 select NETFILTER_NETLINK
28 If this option is enabled, the kernel will include support
29 for logging packets via NFNETLINK.
31 This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
32 and is also scheduled to replace the old syslog-based ipt_LOG
36 tristate "Netfilter connection tracking support"
37 default m if NETFILTER_ADVANCED=n
39 Connection tracking keeps a record of what packets have passed
40 through your machine, in order to figure out how they are related
43 This is required to do Masquerading or other kinds of Network
44 Address Translation. It can also be used to enhance packet
45 filtering (see `Connection state match support' below).
47 To compile it as a module, choose M here. If unsure, say N.
51 config NF_CONNTRACK_MARK
52 bool 'Connection mark tracking support'
53 depends on NETFILTER_ADVANCED
55 This option enables support for connection marks, used by the
56 `CONNMARK' target and `connmark' match. Similar to the mark value
57 of packets, but this mark value is kept in the conntrack session
58 instead of the individual packets.
60 config NF_CONNTRACK_SECMARK
61 bool 'Connection tracking security mark support'
62 depends on NETWORK_SECMARK
63 default m if NETFILTER_ADVANCED=n
65 This option enables security markings to be applied to
66 connections. Typically they are copied to connections from
67 packets using the CONNSECMARK target and copied back from
68 connections to packets with the same target, with the packets
69 being originally labeled via SECMARK.
73 config NF_CONNTRACK_ZONES
74 bool 'Connection tracking zones'
75 depends on NETFILTER_ADVANCED
76 depends on NETFILTER_XT_TARGET_CT
78 This option enables support for connection tracking zones.
79 Normally, each connection needs to have a unique system wide
80 identity. Connection tracking zones allow to have multiple
81 connections using the same identity, as long as they are
82 contained in different zones.
86 config NF_CONNTRACK_PROCFS
87 bool "Supply CT list in procfs (OBSOLETE)"
91 This option enables for the list of known conntrack entries
92 to be shown in procfs under net/netfilter/nf_conntrack. This
93 is considered obsolete in favor of using the conntrack(8)
94 tool which uses Netlink.
96 config NF_CONNTRACK_EVENTS
97 bool "Connection tracking events"
98 depends on NETFILTER_ADVANCED
100 If this option is enabled, the connection tracking code will
101 provide a notifier chain that can be used by other kernel code
102 to get notified about changes in the connection tracking state.
106 config NF_CONNTRACK_TIMEOUT
107 bool 'Connection tracking timeout'
108 depends on NETFILTER_ADVANCED
110 This option enables support for connection tracking timeout
111 extension. This allows you to attach timeout policies to flow
116 config NF_CONNTRACK_TIMESTAMP
117 bool 'Connection tracking timestamping'
118 depends on NETFILTER_ADVANCED
120 This option enables support for connection tracking timestamping.
121 This allows you to store the flow start-time and to obtain
122 the flow-stop time (once it has been destroyed) via Connection
127 config NF_CONNTRACK_LABELS
130 This option enables support for assigning user-defined flag bits
131 to connection tracking entries. It selected by the connlabel match.
133 config NF_CT_PROTO_DCCP
134 tristate 'DCCP protocol connection tracking support'
135 depends on NETFILTER_ADVANCED
138 With this option enabled, the layer 3 independent connection
139 tracking code will be able to do state tracking on DCCP connections.
143 config NF_CT_PROTO_GRE
146 config NF_CT_PROTO_SCTP
147 tristate 'SCTP protocol connection tracking support'
148 depends on NETFILTER_ADVANCED
151 With this option enabled, the layer 3 independent connection
152 tracking code will be able to do state tracking on SCTP connections.
154 If you want to compile it as a module, say M here and read
155 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
157 config NF_CT_PROTO_UDPLITE
158 tristate 'UDP-Lite protocol connection tracking support'
159 depends on NETFILTER_ADVANCED
161 With this option enabled, the layer 3 independent connection
162 tracking code will be able to do state tracking on UDP-Lite
165 To compile it as a module, choose M here. If unsure, say N.
167 config NF_CONNTRACK_AMANDA
168 tristate "Amanda backup protocol support"
169 depends on NETFILTER_ADVANCED
171 select TEXTSEARCH_KMP
173 If you are running the Amanda backup package <http://www.amanda.org/>
174 on this machine or machines that will be MASQUERADED through this
175 machine, then you may want to enable this feature. This allows the
176 connection tracking and natting code to allow the sub-channels that
177 Amanda requires for communication of the backup data, messages and
180 To compile it as a module, choose M here. If unsure, say N.
182 config NF_CONNTRACK_FTP
183 tristate "FTP protocol support"
184 default m if NETFILTER_ADVANCED=n
186 Tracking FTP connections is problematic: special helpers are
187 required for tracking them, and doing masquerading and other forms
188 of Network Address Translation on them.
190 This is FTP support on Layer 3 independent connection tracking.
191 Layer 3 independent connection tracking is experimental scheme
192 which generalize ip_conntrack to support other layer 3 protocols.
194 To compile it as a module, choose M here. If unsure, say N.
196 config NF_CONNTRACK_H323
197 tristate "H.323 protocol support"
198 depends on (IPV6 || IPV6=n)
199 depends on NETFILTER_ADVANCED
201 H.323 is a VoIP signalling protocol from ITU-T. As one of the most
202 important VoIP protocols, it is widely used by voice hardware and
203 software including voice gateways, IP phones, Netmeeting, OpenPhone,
206 With this module you can support H.323 on a connection tracking/NAT
209 This module supports RAS, Fast Start, H.245 Tunnelling, Call
210 Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
211 whiteboard, file transfer, etc. For more information, please
212 visit http://nath323.sourceforge.net/.
214 To compile it as a module, choose M here. If unsure, say N.
216 config NF_CONNTRACK_IRC
217 tristate "IRC protocol support"
218 default m if NETFILTER_ADVANCED=n
220 There is a commonly-used extension to IRC called
221 Direct Client-to-Client Protocol (DCC). This enables users to send
222 files to each other, and also chat to each other without the need
223 of a server. DCC Sending is used anywhere you send files over IRC,
224 and DCC Chat is most commonly used by Eggdrop bots. If you are
225 using NAT, this extension will enable you to send files and initiate
226 chats. Note that you do NOT need this extension to get files or
227 have others initiate chats, or everything else in IRC.
229 To compile it as a module, choose M here. If unsure, say N.
231 config NF_CONNTRACK_BROADCAST
234 config NF_CONNTRACK_NETBIOS_NS
235 tristate "NetBIOS name service protocol support"
236 select NF_CONNTRACK_BROADCAST
238 NetBIOS name service requests are sent as broadcast messages from an
239 unprivileged port and responded to with unicast messages to the
240 same port. This make them hard to firewall properly because connection
241 tracking doesn't deal with broadcasts. This helper tracks locally
242 originating NetBIOS name service requests and the corresponding
243 responses. It relies on correct IP address configuration, specifically
244 netmask and broadcast address. When properly configured, the output
245 of "ip address show" should look similar to this:
247 $ ip -4 address show eth0
248 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
249 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
251 To compile it as a module, choose M here. If unsure, say N.
253 config NF_CONNTRACK_SNMP
254 tristate "SNMP service protocol support"
255 depends on NETFILTER_ADVANCED
256 select NF_CONNTRACK_BROADCAST
258 SNMP service requests are sent as broadcast messages from an
259 unprivileged port and responded to with unicast messages to the
260 same port. This make them hard to firewall properly because connection
261 tracking doesn't deal with broadcasts. This helper tracks locally
262 originating SNMP service requests and the corresponding
263 responses. It relies on correct IP address configuration, specifically
264 netmask and broadcast address.
266 To compile it as a module, choose M here. If unsure, say N.
268 config NF_CONNTRACK_PPTP
269 tristate "PPtP protocol support"
270 depends on NETFILTER_ADVANCED
271 select NF_CT_PROTO_GRE
273 This module adds support for PPTP (Point to Point Tunnelling
274 Protocol, RFC2637) connection tracking and NAT.
276 If you are running PPTP sessions over a stateful firewall or NAT
277 box, you may want to enable this feature.
279 Please note that not all PPTP modes of operation are supported yet.
280 Specifically these limitations exist:
281 - Blindly assumes that control connections are always established
282 in PNS->PAC direction. This is a violation of RFC2637.
283 - Only supports a single call within each session
285 To compile it as a module, choose M here. If unsure, say N.
287 config NF_CONNTRACK_SANE
288 tristate "SANE protocol support"
289 depends on NETFILTER_ADVANCED
291 SANE is a protocol for remote access to scanners as implemented
292 by the 'saned' daemon. Like FTP, it uses separate control and
295 With this module you can support SANE on a connection tracking
298 To compile it as a module, choose M here. If unsure, say N.
300 config NF_CONNTRACK_SIP
301 tristate "SIP protocol support"
302 default m if NETFILTER_ADVANCED=n
304 SIP is an application-layer control protocol that can establish,
305 modify, and terminate multimedia sessions (conferences) such as
306 Internet telephony calls. With the ip_conntrack_sip and
307 the nf_nat_sip modules you can support the protocol on a connection
308 tracking/NATing firewall.
310 To compile it as a module, choose M here. If unsure, say N.
312 config NF_CONNTRACK_TFTP
313 tristate "TFTP protocol support"
314 depends on NETFILTER_ADVANCED
316 TFTP connection tracking helper, this is required depending
317 on how restrictive your ruleset is.
318 If you are using a tftp client behind -j SNAT or -j MASQUERADING
321 To compile it as a module, choose M here. If unsure, say N.
324 tristate 'Connection tracking netlink interface'
325 select NETFILTER_NETLINK
326 default m if NETFILTER_ADVANCED=n
328 This option enables support for a netlink-based userspace interface
330 config NF_CT_NETLINK_TIMEOUT
331 tristate 'Connection tracking timeout tuning via Netlink'
332 select NETFILTER_NETLINK
333 depends on NETFILTER_ADVANCED
335 This option enables support for connection tracking timeout
336 fine-grain tuning. This allows you to attach specific timeout
337 policies to flows, instead of using the global timeout policy.
341 config NF_CT_NETLINK_HELPER
342 tristate 'Connection tracking helpers in user-space via Netlink'
343 select NETFILTER_NETLINK
344 depends on NF_CT_NETLINK
345 depends on NETFILTER_NETLINK_QUEUE
346 depends on NETFILTER_NETLINK_QUEUE_CT
347 depends on NETFILTER_ADVANCED
349 This option enables the user-space connection tracking helpers
354 config NETFILTER_NETLINK_QUEUE_CT
355 bool "NFQUEUE integration with Connection Tracking"
357 depends on NETFILTER_NETLINK_QUEUE
359 If this option is enabled, NFQUEUE can include Connection Tracking
360 information together with the packet is the enqueued via NFNETLINK.
370 config NF_NAT_PROTO_DCCP
372 depends on NF_NAT && NF_CT_PROTO_DCCP
373 default NF_NAT && NF_CT_PROTO_DCCP
375 config NF_NAT_PROTO_UDPLITE
377 depends on NF_NAT && NF_CT_PROTO_UDPLITE
378 default NF_NAT && NF_CT_PROTO_UDPLITE
380 config NF_NAT_PROTO_SCTP
382 default NF_NAT && NF_CT_PROTO_SCTP
383 depends on NF_NAT && NF_CT_PROTO_SCTP
388 depends on NF_CONNTRACK && NF_NAT
389 default NF_NAT && NF_CONNTRACK_AMANDA
393 depends on NF_CONNTRACK && NF_NAT
394 default NF_NAT && NF_CONNTRACK_FTP
398 depends on NF_CONNTRACK && NF_NAT
399 default NF_NAT && NF_CONNTRACK_IRC
403 depends on NF_CONNTRACK && NF_NAT
404 default NF_NAT && NF_CONNTRACK_SIP
408 depends on NF_CONNTRACK && NF_NAT
409 default NF_NAT && NF_CONNTRACK_TFTP
413 # transparent proxy support
414 config NETFILTER_TPROXY
415 tristate "Transparent proxying support"
416 depends on IP_NF_MANGLE
417 depends on NETFILTER_ADVANCED
419 This option enables transparent proxying support, that is,
420 support for handling non-locally bound IPv4 TCP and UDP sockets.
421 For it to work you will have to configure certain iptables rules
422 and use policy routing. For more information on how to set it up
423 see Documentation/networking/tproxy.txt.
425 To compile it as a module, choose M here. If unsure, say N.
427 config NETFILTER_XTABLES
428 tristate "Netfilter Xtables support (required for ip_tables)"
429 default m if NETFILTER_ADVANCED=n
431 This is required if you intend to use any of ip_tables,
432 ip6_tables or arp_tables.
436 comment "Xtables combined modules"
438 config NETFILTER_XT_MARK
439 tristate 'nfmark target and match support'
440 default m if NETFILTER_ADVANCED=n
442 This option adds the "MARK" target and "mark" match.
444 Netfilter mark matching allows you to match packets based on the
445 "nfmark" value in the packet.
446 The target allows you to create rules in the "mangle" table which alter
447 the netfilter mark (nfmark) field associated with the packet.
449 Prior to routing, the nfmark can influence the routing method (see
450 "Use netfilter MARK value as routing key") and can also be used by
451 other subsystems to change their behavior.
453 config NETFILTER_XT_CONNMARK
454 tristate 'ctmark target and match support'
455 depends on NF_CONNTRACK
456 depends on NETFILTER_ADVANCED
457 select NF_CONNTRACK_MARK
459 This option adds the "CONNMARK" target and "connmark" match.
461 Netfilter allows you to store a mark value per connection (a.k.a.
462 ctmark), similarly to the packet mark (nfmark). Using this
463 target and match, you can set and match on this mark.
465 config NETFILTER_XT_SET
466 tristate 'set target and match support'
468 depends on NETFILTER_ADVANCED
470 This option adds the "SET" target and "set" match.
472 Using this target and match, you can add/delete and match
473 elements in the sets created by ipset(8).
475 To compile it as a module, choose M here. If unsure, say N.
477 # alphabetically ordered list of targets
479 comment "Xtables targets"
481 config NETFILTER_XT_TARGET_AUDIT
482 tristate "AUDIT target support"
484 depends on NETFILTER_ADVANCED
486 This option adds a 'AUDIT' target, which can be used to create
487 audit records for packets dropped/accepted.
489 To compileit as a module, choose M here. If unsure, say N.
491 config NETFILTER_XT_TARGET_CHECKSUM
492 tristate "CHECKSUM target support"
493 depends on IP_NF_MANGLE || IP6_NF_MANGLE
494 depends on NETFILTER_ADVANCED
496 This option adds a `CHECKSUM' target, which can be used in the iptables mangle
499 You can use this target to compute and fill in the checksum in
500 a packet that lacks a checksum. This is particularly useful,
501 if you need to work around old applications such as dhcp clients,
502 that do not work well with checksum offloads, but don't want to disable
503 checksum offload in your device.
505 To compile it as a module, choose M here. If unsure, say N.
507 config NETFILTER_XT_TARGET_CLASSIFY
508 tristate '"CLASSIFY" target support'
509 depends on NETFILTER_ADVANCED
511 This option adds a `CLASSIFY' target, which enables the user to set
512 the priority of a packet. Some qdiscs can use this value for
513 classification, among these are:
515 atm, cbq, dsmark, pfifo_fast, htb, prio
517 To compile it as a module, choose M here. If unsure, say N.
519 config NETFILTER_XT_TARGET_CONNMARK
520 tristate '"CONNMARK" target support'
521 depends on NF_CONNTRACK
522 depends on NETFILTER_ADVANCED
523 select NETFILTER_XT_CONNMARK
525 This is a backwards-compat option for the user's convenience
526 (e.g. when running oldconfig). It selects
527 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
529 config NETFILTER_XT_TARGET_CONNSECMARK
530 tristate '"CONNSECMARK" target support'
531 depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
532 default m if NETFILTER_ADVANCED=n
534 The CONNSECMARK target copies security markings from packets
535 to connections, and restores security markings from connections
536 to packets (if the packets are not already marked). This would
537 normally be used in conjunction with the SECMARK target.
539 To compile it as a module, choose M here. If unsure, say N.
541 config NETFILTER_XT_TARGET_CT
542 tristate '"CT" target support'
543 depends on NF_CONNTRACK
544 depends on IP_NF_RAW || IP6_NF_RAW
545 depends on NETFILTER_ADVANCED
547 This options adds a `CT' target, which allows to specify initial
548 connection tracking parameters like events to be delivered and
549 the helper to be used.
551 To compile it as a module, choose M here. If unsure, say N.
553 config NETFILTER_XT_TARGET_DSCP
554 tristate '"DSCP" and "TOS" target support'
555 depends on IP_NF_MANGLE || IP6_NF_MANGLE
556 depends on NETFILTER_ADVANCED
558 This option adds a `DSCP' target, which allows you to manipulate
559 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
561 The DSCP field can have any value between 0x0 and 0x3f inclusive.
563 It also adds the "TOS" target, which allows you to create rules in
564 the "mangle" table which alter the Type Of Service field of an IPv4
565 or the Priority field of an IPv6 packet, prior to routing.
567 To compile it as a module, choose M here. If unsure, say N.
569 config NETFILTER_XT_TARGET_HL
570 tristate '"HL" hoplimit target support'
571 depends on IP_NF_MANGLE || IP6_NF_MANGLE
572 depends on NETFILTER_ADVANCED
574 This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
575 targets, which enable the user to change the
576 hoplimit/time-to-live value of the IP header.
578 While it is safe to decrement the hoplimit/TTL value, the
579 modules also allow to increment and set the hoplimit value of
580 the header to arbitrary values. This is EXTREMELY DANGEROUS
581 since you can easily create immortal packets that loop
582 forever on the network.
584 config NETFILTER_XT_TARGET_HMARK
585 tristate '"HMARK" target support'
586 depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
587 depends on NETFILTER_ADVANCED
589 This option adds the "HMARK" target.
591 The target allows you to create rules in the "raw" and "mangle" tables
592 which set the skbuff mark by means of hash calculation within a given
593 range. The nfmark can influence the routing method (see "Use netfilter
594 MARK value as routing key") and can also be used by other subsystems to
595 change their behaviour.
597 To compile it as a module, choose M here. If unsure, say N.
599 config NETFILTER_XT_TARGET_IDLETIMER
600 tristate "IDLETIMER target support"
601 depends on NETFILTER_ADVANCED
604 This option adds the `IDLETIMER' target. Each matching packet
605 resets the timer associated with label specified when the rule is
606 added. When the timer expires, it triggers a sysfs notification.
607 The remaining time for expiration can be read via sysfs.
609 To compile it as a module, choose M here. If unsure, say N.
611 config NETFILTER_XT_TARGET_LED
612 tristate '"LED" target support'
613 depends on LEDS_CLASS && LEDS_TRIGGERS
614 depends on NETFILTER_ADVANCED
616 This option adds a `LED' target, which allows you to blink LEDs in
617 response to particular packets passing through your machine.
619 This can be used to turn a spare LED into a network activity LED,
620 which only flashes in response to FTP transfers, for example. Or
621 you could have an LED which lights up for a minute or two every time
622 somebody connects to your machine via SSH.
624 You will need support for the "led" class to make this work.
626 To create an LED trigger for incoming SSH traffic:
627 iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
629 Then attach the new trigger to an LED on your system:
630 echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
632 For more information on the LEDs available on your system, see
633 Documentation/leds/leds-class.txt
635 config NETFILTER_XT_TARGET_LOG
636 tristate "LOG target support"
637 default m if NETFILTER_ADVANCED=n
639 This option adds a `LOG' target, which allows you to create rules in
640 any iptables table which records the packet header to the syslog.
642 To compile it as a module, choose M here. If unsure, say N.
644 config NETFILTER_XT_TARGET_MARK
645 tristate '"MARK" target support'
646 depends on NETFILTER_ADVANCED
647 select NETFILTER_XT_MARK
649 This is a backwards-compat option for the user's convenience
650 (e.g. when running oldconfig). It selects
651 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
653 config NETFILTER_XT_TARGET_NETMAP
654 tristate '"NETMAP" target support'
657 NETMAP is an implementation of static 1:1 NAT mapping of network
658 addresses. It maps the network address part, while keeping the host
661 To compile it as a module, choose M here. If unsure, say N.
663 config NETFILTER_XT_TARGET_NFLOG
664 tristate '"NFLOG" target support'
665 default m if NETFILTER_ADVANCED=n
666 select NETFILTER_NETLINK_LOG
668 This option enables the NFLOG target, which allows to LOG
669 messages through nfnetlink_log.
671 To compile it as a module, choose M here. If unsure, say N.
673 config NETFILTER_XT_TARGET_NFQUEUE
674 tristate '"NFQUEUE" target Support'
675 depends on NETFILTER_ADVANCED
676 select NETFILTER_NETLINK_QUEUE
678 This target replaced the old obsolete QUEUE target.
680 As opposed to QUEUE, it supports 65535 different queues,
683 To compile it as a module, choose M here. If unsure, say N.
685 config NETFILTER_XT_TARGET_NOTRACK
686 tristate '"NOTRACK" target support (DEPRECATED)'
687 depends on NF_CONNTRACK
688 depends on IP_NF_RAW || IP6_NF_RAW
689 depends on NETFILTER_ADVANCED
690 select NETFILTER_XT_TARGET_CT
692 config NETFILTER_XT_TARGET_RATEEST
693 tristate '"RATEEST" target support'
694 depends on NETFILTER_ADVANCED
696 This option adds a `RATEEST' target, which allows to measure
697 rates similar to TC estimators. The `rateest' match can be
698 used to match on the measured rates.
700 To compile it as a module, choose M here. If unsure, say N.
702 config NETFILTER_XT_TARGET_REDIRECT
703 tristate "REDIRECT target support"
706 REDIRECT is a special case of NAT: all incoming connections are
707 mapped onto the incoming interface's address, causing the packets to
708 come to the local machine instead of passing through. This is
709 useful for transparent proxies.
711 To compile it as a module, choose M here. If unsure, say N.
713 config NETFILTER_XT_TARGET_TEE
714 tristate '"TEE" - packet cloning to alternate destination'
715 depends on NETFILTER_ADVANCED
716 depends on (IPV6 || IPV6=n)
717 depends on !NF_CONNTRACK || NF_CONNTRACK
719 This option adds a "TEE" target with which a packet can be cloned and
720 this clone be rerouted to another nexthop.
722 config NETFILTER_XT_TARGET_TPROXY
723 tristate '"TPROXY" target support'
724 depends on NETFILTER_TPROXY
725 depends on NETFILTER_XTABLES
726 depends on NETFILTER_ADVANCED
727 select NF_DEFRAG_IPV4
728 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
730 This option adds a `TPROXY' target, which is somewhat similar to
731 REDIRECT. It can only be used in the mangle table and is useful
732 to redirect traffic to a transparent proxy. It does _not_ depend
733 on Netfilter connection tracking and NAT, unlike REDIRECT.
735 To compile it as a module, choose M here. If unsure, say N.
737 config NETFILTER_XT_TARGET_TRACE
738 tristate '"TRACE" target support'
739 depends on IP_NF_RAW || IP6_NF_RAW
740 depends on NETFILTER_ADVANCED
742 The TRACE target allows you to mark packets so that the kernel
743 will log every rule which match the packets as those traverse
744 the tables, chains, rules.
746 If you want to compile it as a module, say M here and read
747 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
749 config NETFILTER_XT_TARGET_SECMARK
750 tristate '"SECMARK" target support'
751 depends on NETWORK_SECMARK
752 default m if NETFILTER_ADVANCED=n
754 The SECMARK target allows security marking of network
755 packets, for use with security subsystems.
757 To compile it as a module, choose M here. If unsure, say N.
759 config NETFILTER_XT_TARGET_TCPMSS
760 tristate '"TCPMSS" target support'
761 depends on (IPV6 || IPV6=n)
762 default m if NETFILTER_ADVANCED=n
764 This option adds a `TCPMSS' target, which allows you to alter the
765 MSS value of TCP SYN packets, to control the maximum size for that
766 connection (usually limiting it to your outgoing interface's MTU
769 This is used to overcome criminally braindead ISPs or servers which
770 block ICMP Fragmentation Needed packets. The symptoms of this
771 problem are that everything works fine from your Linux
772 firewall/router, but machines behind it can never exchange large
774 1) Web browsers connect, then hang with no data received.
775 2) Small mail works fine, but large emails hang.
776 3) ssh works fine, but scp hangs after initial handshaking.
778 Workaround: activate this option and add a rule to your firewall
781 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
782 -j TCPMSS --clamp-mss-to-pmtu
784 To compile it as a module, choose M here. If unsure, say N.
786 config NETFILTER_XT_TARGET_TCPOPTSTRIP
787 tristate '"TCPOPTSTRIP" target support'
788 depends on IP_NF_MANGLE || IP6_NF_MANGLE
789 depends on NETFILTER_ADVANCED
791 This option adds a "TCPOPTSTRIP" target, which allows you to strip
792 TCP options from TCP packets.
794 # alphabetically ordered list of matches
796 comment "Xtables matches"
798 config NETFILTER_XT_MATCH_ADDRTYPE
799 tristate '"addrtype" address type match support'
800 depends on NETFILTER_ADVANCED
802 This option allows you to match what routing thinks of an address,
803 eg. UNICAST, LOCAL, BROADCAST, ...
805 If you want to compile it as a module, say M here and read
806 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
808 config NETFILTER_XT_MATCH_BPF
809 tristate '"bpf" match support'
810 depends on NETFILTER_ADVANCED
812 BPF matching applies a linux socket filter to each packet and
813 accepts those for which the filter returns non-zero.
815 To compile it as a module, choose M here. If unsure, say N.
817 config NETFILTER_XT_MATCH_CLUSTER
818 tristate '"cluster" match support'
819 depends on NF_CONNTRACK
820 depends on NETFILTER_ADVANCED
822 This option allows you to build work-load-sharing clusters of
823 network servers/stateful firewalls without having a dedicated
824 load-balancing router/server/switch. Basically, this match returns
825 true when the packet must be handled by this cluster node. Thus,
826 all nodes see all packets and this match decides which node handles
827 what packets. The work-load sharing algorithm is based on source
830 If you say Y or M here, try `iptables -m cluster --help` for
833 config NETFILTER_XT_MATCH_COMMENT
834 tristate '"comment" match support'
835 depends on NETFILTER_ADVANCED
837 This option adds a `comment' dummy-match, which allows you to put
838 comments in your iptables ruleset.
840 If you want to compile it as a module, say M here and read
841 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
843 config NETFILTER_XT_MATCH_CONNBYTES
844 tristate '"connbytes" per-connection counter match support'
845 depends on NF_CONNTRACK
846 depends on NETFILTER_ADVANCED
848 This option adds a `connbytes' match, which allows you to match the
849 number of bytes and/or packets for each direction within a connection.
851 If you want to compile it as a module, say M here and read
852 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
854 config NETFILTER_XT_MATCH_CONNLABEL
855 tristate '"connlabel" match support'
856 select NF_CONNTRACK_LABELS
857 depends on NF_CONNTRACK
858 depends on NETFILTER_ADVANCED
860 This match allows you to test and assign userspace-defined labels names
861 to a connection. The kernel only stores bit values - mapping
862 names to bits is done by userspace.
864 Unlike connmark, more than 32 flag bits may be assigned to a
865 connection simultaneously.
867 config NETFILTER_XT_MATCH_CONNLIMIT
868 tristate '"connlimit" match support"'
869 depends on NF_CONNTRACK
870 depends on NETFILTER_ADVANCED
872 This match allows you to match against the number of parallel
873 connections to a server per client IP address (or address block).
875 config NETFILTER_XT_MATCH_CONNMARK
876 tristate '"connmark" connection mark match support'
877 depends on NF_CONNTRACK
878 depends on NETFILTER_ADVANCED
879 select NETFILTER_XT_CONNMARK
881 This is a backwards-compat option for the user's convenience
882 (e.g. when running oldconfig). It selects
883 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
885 config NETFILTER_XT_MATCH_CONNTRACK
886 tristate '"conntrack" connection tracking match support'
887 depends on NF_CONNTRACK
888 default m if NETFILTER_ADVANCED=n
890 This is a general conntrack match module, a superset of the state match.
892 It allows matching on additional conntrack information, which is
893 useful in complex configurations, such as NAT gateways with multiple
894 internet links or tunnels.
896 To compile it as a module, choose M here. If unsure, say N.
898 config NETFILTER_XT_MATCH_CPU
899 tristate '"cpu" match support'
900 depends on NETFILTER_ADVANCED
902 CPU matching allows you to match packets based on the CPU
903 currently handling the packet.
905 To compile it as a module, choose M here. If unsure, say N.
907 config NETFILTER_XT_MATCH_DCCP
908 tristate '"dccp" protocol match support'
909 depends on NETFILTER_ADVANCED
912 With this option enabled, you will be able to use the iptables
913 `dccp' match in order to match on DCCP source/destination ports
916 If you want to compile it as a module, say M here and read
917 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
919 config NETFILTER_XT_MATCH_DEVGROUP
920 tristate '"devgroup" match support'
921 depends on NETFILTER_ADVANCED
923 This options adds a `devgroup' match, which allows to match on the
924 device group a network device is assigned to.
926 To compile it as a module, choose M here. If unsure, say N.
928 config NETFILTER_XT_MATCH_DSCP
929 tristate '"dscp" and "tos" match support'
930 depends on NETFILTER_ADVANCED
932 This option adds a `DSCP' match, which allows you to match against
933 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
935 The DSCP field can have any value between 0x0 and 0x3f inclusive.
937 It will also add a "tos" match, which allows you to match packets
938 based on the Type Of Service fields of the IPv4 packet (which share
939 the same bits as DSCP).
941 To compile it as a module, choose M here. If unsure, say N.
943 config NETFILTER_XT_MATCH_ECN
944 tristate '"ecn" match support'
945 depends on NETFILTER_ADVANCED
947 This option adds an "ECN" match, which allows you to match against
948 the IPv4 and TCP header ECN fields.
950 To compile it as a module, choose M here. If unsure, say N.
952 config NETFILTER_XT_MATCH_ESP
953 tristate '"esp" match support'
954 depends on NETFILTER_ADVANCED
956 This match extension allows you to match a range of SPIs
957 inside ESP header of IPSec packets.
959 To compile it as a module, choose M here. If unsure, say N.
961 config NETFILTER_XT_MATCH_HASHLIMIT
962 tristate '"hashlimit" match support'
963 depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
964 depends on NETFILTER_ADVANCED
966 This option adds a `hashlimit' match.
968 As opposed to `limit', this match dynamically creates a hash table
969 of limit buckets, based on your selection of source/destination
970 addresses and/or ports.
972 It enables you to express policies like `10kpps for any given
973 destination address' or `500pps from any given source address'
976 config NETFILTER_XT_MATCH_HELPER
977 tristate '"helper" match support'
978 depends on NF_CONNTRACK
979 depends on NETFILTER_ADVANCED
981 Helper matching allows you to match packets in dynamic connections
982 tracked by a conntrack-helper, ie. ip_conntrack_ftp
984 To compile it as a module, choose M here. If unsure, say Y.
986 config NETFILTER_XT_MATCH_HL
987 tristate '"hl" hoplimit/TTL match support'
988 depends on NETFILTER_ADVANCED
990 HL matching allows you to match packets based on the hoplimit
991 in the IPv6 header, or the time-to-live field in the IPv4
992 header of the packet.
994 config NETFILTER_XT_MATCH_IPRANGE
995 tristate '"iprange" address range match support'
996 depends on NETFILTER_ADVANCED
998 This option adds a "iprange" match, which allows you to match based on
999 an IP address range. (Normal iptables only matches on single addresses
1000 with an optional mask.)
1004 config NETFILTER_XT_MATCH_IPVS
1005 tristate '"ipvs" match support'
1007 depends on NETFILTER_ADVANCED
1008 depends on NF_CONNTRACK
1010 This option allows you to match against IPVS properties of a packet.
1014 config NETFILTER_XT_MATCH_LENGTH
1015 tristate '"length" match support'
1016 depends on NETFILTER_ADVANCED
1018 This option allows you to match the length of a packet against a
1019 specific value or range of values.
1021 To compile it as a module, choose M here. If unsure, say N.
1023 config NETFILTER_XT_MATCH_LIMIT
1024 tristate '"limit" match support'
1025 depends on NETFILTER_ADVANCED
1027 limit matching allows you to control the rate at which a rule can be
1028 matched: mainly useful in combination with the LOG target ("LOG
1029 target support", below) and to avoid some Denial of Service attacks.
1031 To compile it as a module, choose M here. If unsure, say N.
1033 config NETFILTER_XT_MATCH_MAC
1034 tristate '"mac" address match support'
1035 depends on NETFILTER_ADVANCED
1037 MAC matching allows you to match packets based on the source
1038 Ethernet address of the packet.
1040 To compile it as a module, choose M here. If unsure, say N.
1042 config NETFILTER_XT_MATCH_MARK
1043 tristate '"mark" match support'
1044 depends on NETFILTER_ADVANCED
1045 select NETFILTER_XT_MARK
1047 This is a backwards-compat option for the user's convenience
1048 (e.g. when running oldconfig). It selects
1049 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
1051 config NETFILTER_XT_MATCH_MULTIPORT
1052 tristate '"multiport" Multiple port match support'
1053 depends on NETFILTER_ADVANCED
1055 Multiport matching allows you to match TCP or UDP packets based on
1056 a series of source or destination ports: normally a rule can only
1057 match a single range of ports.
1059 To compile it as a module, choose M here. If unsure, say N.
1061 config NETFILTER_XT_MATCH_NFACCT
1062 tristate '"nfacct" match support'
1063 depends on NETFILTER_ADVANCED
1064 select NETFILTER_NETLINK_ACCT
1066 This option allows you to use the extended accounting through
1069 To compile it as a module, choose M here. If unsure, say N.
1071 config NETFILTER_XT_MATCH_OSF
1072 tristate '"osf" Passive OS fingerprint match'
1073 depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
1075 This option selects the Passive OS Fingerprinting match module
1076 that allows to passively match the remote operating system by
1077 analyzing incoming TCP SYN packets.
1079 Rules and loading software can be downloaded from
1080 http://www.ioremap.net/projects/osf
1082 To compile it as a module, choose M here. If unsure, say N.
1084 config NETFILTER_XT_MATCH_OWNER
1085 tristate '"owner" match support'
1086 depends on NETFILTER_ADVANCED
1088 Socket owner matching allows you to match locally-generated packets
1089 based on who created the socket: the user or group. It is also
1090 possible to check whether a socket actually exists.
1092 config NETFILTER_XT_MATCH_POLICY
1093 tristate 'IPsec "policy" match support'
1095 default m if NETFILTER_ADVANCED=n
1097 Policy matching allows you to match packets based on the
1098 IPsec policy that was used during decapsulation/will
1099 be used during encapsulation.
1101 To compile it as a module, choose M here. If unsure, say N.
1103 config NETFILTER_XT_MATCH_PHYSDEV
1104 tristate '"physdev" match support'
1105 depends on BRIDGE && BRIDGE_NETFILTER
1106 depends on NETFILTER_ADVANCED
1108 Physdev packet matching matches against the physical bridge ports
1109 the IP packet arrived on or will leave by.
1111 To compile it as a module, choose M here. If unsure, say N.
1113 config NETFILTER_XT_MATCH_PKTTYPE
1114 tristate '"pkttype" packet type match support'
1115 depends on NETFILTER_ADVANCED
1117 Packet type matching allows you to match a packet by
1118 its "class", eg. BROADCAST, MULTICAST, ...
1121 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
1123 To compile it as a module, choose M here. If unsure, say N.
1125 config NETFILTER_XT_MATCH_QUOTA
1126 tristate '"quota" match support'
1127 depends on NETFILTER_ADVANCED
1129 This option adds a `quota' match, which allows to match on a
1132 If you want to compile it as a module, say M here and read
1133 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1135 config NETFILTER_XT_MATCH_RATEEST
1136 tristate '"rateest" match support'
1137 depends on NETFILTER_ADVANCED
1138 select NETFILTER_XT_TARGET_RATEEST
1140 This option adds a `rateest' match, which allows to match on the
1141 rate estimated by the RATEEST target.
1143 To compile it as a module, choose M here. If unsure, say N.
1145 config NETFILTER_XT_MATCH_REALM
1146 tristate '"realm" match support'
1147 depends on NETFILTER_ADVANCED
1148 select IP_ROUTE_CLASSID
1150 This option adds a `realm' match, which allows you to use the realm
1151 key from the routing subsystem inside iptables.
1153 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
1156 If you want to compile it as a module, say M here and read
1157 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1159 config NETFILTER_XT_MATCH_RECENT
1160 tristate '"recent" match support'
1161 depends on NETFILTER_ADVANCED
1163 This match is used for creating one or many lists of recently
1164 used addresses and then matching against that/those list(s).
1166 Short options are available by using 'iptables -m recent -h'
1167 Official Website: <http://snowman.net/projects/ipt_recent/>
1169 config NETFILTER_XT_MATCH_SCTP
1170 tristate '"sctp" protocol match support'
1171 depends on NETFILTER_ADVANCED
1174 With this option enabled, you will be able to use the
1175 `sctp' match in order to match on SCTP source/destination ports
1176 and SCTP chunk types.
1178 If you want to compile it as a module, say M here and read
1179 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1181 config NETFILTER_XT_MATCH_SOCKET
1182 tristate '"socket" match support'
1183 depends on NETFILTER_TPROXY
1184 depends on NETFILTER_XTABLES
1185 depends on NETFILTER_ADVANCED
1186 depends on !NF_CONNTRACK || NF_CONNTRACK
1187 select NF_DEFRAG_IPV4
1188 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
1190 This option adds a `socket' match, which can be used to match
1191 packets for which a TCP or UDP socket lookup finds a valid socket.
1192 It can be used in combination with the MARK target and policy
1193 routing to implement full featured non-locally bound sockets.
1195 To compile it as a module, choose M here. If unsure, say N.
1197 config NETFILTER_XT_MATCH_STATE
1198 tristate '"state" match support'
1199 depends on NF_CONNTRACK
1200 default m if NETFILTER_ADVANCED=n
1202 Connection state matching allows you to match packets based on their
1203 relationship to a tracked connection (ie. previous packets). This
1204 is a powerful tool for packet classification.
1206 To compile it as a module, choose M here. If unsure, say N.
1208 config NETFILTER_XT_MATCH_STATISTIC
1209 tristate '"statistic" match support'
1210 depends on NETFILTER_ADVANCED
1212 This option adds a `statistic' match, which allows you to match
1213 on packets periodically or randomly with a given percentage.
1215 To compile it as a module, choose M here. If unsure, say N.
1217 config NETFILTER_XT_MATCH_STRING
1218 tristate '"string" match support'
1219 depends on NETFILTER_ADVANCED
1221 select TEXTSEARCH_KMP
1222 select TEXTSEARCH_BM
1223 select TEXTSEARCH_FSM
1225 This option adds a `string' match, which allows you to look for
1226 pattern matchings in packets.
1228 To compile it as a module, choose M here. If unsure, say N.
1230 config NETFILTER_XT_MATCH_TCPMSS
1231 tristate '"tcpmss" match support'
1232 depends on NETFILTER_ADVANCED
1234 This option adds a `tcpmss' match, which allows you to examine the
1235 MSS value of TCP SYN packets, which control the maximum packet size
1236 for that connection.
1238 To compile it as a module, choose M here. If unsure, say N.
1240 config NETFILTER_XT_MATCH_TIME
1241 tristate '"time" match support'
1242 depends on NETFILTER_ADVANCED
1244 This option adds a "time" match, which allows you to match based on
1245 the packet arrival time (at the machine which netfilter is running)
1246 on) or departure time/date (for locally generated packets).
1248 If you say Y here, try `iptables -m time --help` for
1251 If you want to compile it as a module, say M here.
1254 config NETFILTER_XT_MATCH_U32
1255 tristate '"u32" match support'
1256 depends on NETFILTER_ADVANCED
1258 u32 allows you to extract quantities of up to 4 bytes from a packet,
1259 AND them with specified masks, shift them by specified amounts and
1260 test whether the results are in any of a set of specified ranges.
1261 The specification of what to extract is general enough to skip over
1262 headers with lengths stored in the packet, as in IP or TCP header
1265 Details and examples are in the kernel module source.
1267 endif # NETFILTER_XTABLES
1271 source "net/netfilter/ipset/Kconfig"
1273 source "net/netfilter/ipvs/Kconfig"