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
411 config NETFILTER_SYNPROXY
416 config NETFILTER_XTABLES
417 tristate "Netfilter Xtables support (required for ip_tables)"
418 default m if NETFILTER_ADVANCED=n
420 This is required if you intend to use any of ip_tables,
421 ip6_tables or arp_tables.
425 comment "Xtables combined modules"
427 config NETFILTER_XT_MARK
428 tristate 'nfmark target and match support'
429 default m if NETFILTER_ADVANCED=n
431 This option adds the "MARK" target and "mark" match.
433 Netfilter mark matching allows you to match packets based on the
434 "nfmark" value in the packet.
435 The target allows you to create rules in the "mangle" table which alter
436 the netfilter mark (nfmark) field associated with the packet.
438 Prior to routing, the nfmark can influence the routing method (see
439 "Use netfilter MARK value as routing key") and can also be used by
440 other subsystems to change their behavior.
442 config NETFILTER_XT_CONNMARK
443 tristate 'ctmark target and match support'
444 depends on NF_CONNTRACK
445 depends on NETFILTER_ADVANCED
446 select NF_CONNTRACK_MARK
448 This option adds the "CONNMARK" target and "connmark" match.
450 Netfilter allows you to store a mark value per connection (a.k.a.
451 ctmark), similarly to the packet mark (nfmark). Using this
452 target and match, you can set and match on this mark.
454 config NETFILTER_XT_SET
455 tristate 'set target and match support'
457 depends on NETFILTER_ADVANCED
459 This option adds the "SET" target and "set" match.
461 Using this target and match, you can add/delete and match
462 elements in the sets created by ipset(8).
464 To compile it as a module, choose M here. If unsure, say N.
466 # alphabetically ordered list of targets
468 comment "Xtables targets"
470 config NETFILTER_XT_TARGET_AUDIT
471 tristate "AUDIT target support"
473 depends on NETFILTER_ADVANCED
475 This option adds a 'AUDIT' target, which can be used to create
476 audit records for packets dropped/accepted.
478 To compileit as a module, choose M here. If unsure, say N.
480 config NETFILTER_XT_TARGET_CHECKSUM
481 tristate "CHECKSUM target support"
482 depends on IP_NF_MANGLE || IP6_NF_MANGLE
483 depends on NETFILTER_ADVANCED
485 This option adds a `CHECKSUM' target, which can be used in the iptables mangle
488 You can use this target to compute and fill in the checksum in
489 a packet that lacks a checksum. This is particularly useful,
490 if you need to work around old applications such as dhcp clients,
491 that do not work well with checksum offloads, but don't want to disable
492 checksum offload in your device.
494 To compile it as a module, choose M here. If unsure, say N.
496 config NETFILTER_XT_TARGET_CLASSIFY
497 tristate '"CLASSIFY" target support'
498 depends on NETFILTER_ADVANCED
500 This option adds a `CLASSIFY' target, which enables the user to set
501 the priority of a packet. Some qdiscs can use this value for
502 classification, among these are:
504 atm, cbq, dsmark, pfifo_fast, htb, prio
506 To compile it as a module, choose M here. If unsure, say N.
508 config NETFILTER_XT_TARGET_CONNMARK
509 tristate '"CONNMARK" target support'
510 depends on NF_CONNTRACK
511 depends on NETFILTER_ADVANCED
512 select NETFILTER_XT_CONNMARK
514 This is a backwards-compat option for the user's convenience
515 (e.g. when running oldconfig). It selects
516 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
518 config NETFILTER_XT_TARGET_CONNSECMARK
519 tristate '"CONNSECMARK" target support'
520 depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
521 default m if NETFILTER_ADVANCED=n
523 The CONNSECMARK target copies security markings from packets
524 to connections, and restores security markings from connections
525 to packets (if the packets are not already marked). This would
526 normally be used in conjunction with the SECMARK target.
528 To compile it as a module, choose M here. If unsure, say N.
530 config NETFILTER_XT_TARGET_CT
531 tristate '"CT" target support'
532 depends on NF_CONNTRACK
533 depends on IP_NF_RAW || IP6_NF_RAW
534 depends on NETFILTER_ADVANCED
536 This options adds a `CT' target, which allows to specify initial
537 connection tracking parameters like events to be delivered and
538 the helper to be used.
540 To compile it as a module, choose M here. If unsure, say N.
542 config NETFILTER_XT_TARGET_DSCP
543 tristate '"DSCP" and "TOS" target support'
544 depends on IP_NF_MANGLE || IP6_NF_MANGLE
545 depends on NETFILTER_ADVANCED
547 This option adds a `DSCP' target, which allows you to manipulate
548 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
550 The DSCP field can have any value between 0x0 and 0x3f inclusive.
552 It also adds the "TOS" target, which allows you to create rules in
553 the "mangle" table which alter the Type Of Service field of an IPv4
554 or the Priority field of an IPv6 packet, prior to routing.
556 To compile it as a module, choose M here. If unsure, say N.
558 config NETFILTER_XT_TARGET_HL
559 tristate '"HL" hoplimit target support'
560 depends on IP_NF_MANGLE || IP6_NF_MANGLE
561 depends on NETFILTER_ADVANCED
563 This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
564 targets, which enable the user to change the
565 hoplimit/time-to-live value of the IP header.
567 While it is safe to decrement the hoplimit/TTL value, the
568 modules also allow to increment and set the hoplimit value of
569 the header to arbitrary values. This is EXTREMELY DANGEROUS
570 since you can easily create immortal packets that loop
571 forever on the network.
573 config NETFILTER_XT_TARGET_HMARK
574 tristate '"HMARK" target support'
575 depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
576 depends on NETFILTER_ADVANCED
578 This option adds the "HMARK" target.
580 The target allows you to create rules in the "raw" and "mangle" tables
581 which set the skbuff mark by means of hash calculation within a given
582 range. The nfmark can influence the routing method (see "Use netfilter
583 MARK value as routing key") and can also be used by other subsystems to
584 change their behaviour.
586 To compile it as a module, choose M here. If unsure, say N.
588 config NETFILTER_XT_TARGET_IDLETIMER
589 tristate "IDLETIMER target support"
590 depends on NETFILTER_ADVANCED
593 This option adds the `IDLETIMER' target. Each matching packet
594 resets the timer associated with label specified when the rule is
595 added. When the timer expires, it triggers a sysfs notification.
596 The remaining time for expiration can be read via sysfs.
598 To compile it as a module, choose M here. If unsure, say N.
600 config NETFILTER_XT_TARGET_LED
601 tristate '"LED" target support'
602 depends on LEDS_CLASS && LEDS_TRIGGERS
603 depends on NETFILTER_ADVANCED
605 This option adds a `LED' target, which allows you to blink LEDs in
606 response to particular packets passing through your machine.
608 This can be used to turn a spare LED into a network activity LED,
609 which only flashes in response to FTP transfers, for example. Or
610 you could have an LED which lights up for a minute or two every time
611 somebody connects to your machine via SSH.
613 You will need support for the "led" class to make this work.
615 To create an LED trigger for incoming SSH traffic:
616 iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
618 Then attach the new trigger to an LED on your system:
619 echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
621 For more information on the LEDs available on your system, see
622 Documentation/leds/leds-class.txt
624 config NETFILTER_XT_TARGET_LOG
625 tristate "LOG target support"
626 default m if NETFILTER_ADVANCED=n
628 This option adds a `LOG' target, which allows you to create rules in
629 any iptables table which records the packet header to the syslog.
631 To compile it as a module, choose M here. If unsure, say N.
633 config NETFILTER_XT_TARGET_MARK
634 tristate '"MARK" target support'
635 depends on NETFILTER_ADVANCED
636 select NETFILTER_XT_MARK
638 This is a backwards-compat option for the user's convenience
639 (e.g. when running oldconfig). It selects
640 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
642 config NETFILTER_XT_TARGET_NETMAP
643 tristate '"NETMAP" target support'
646 NETMAP is an implementation of static 1:1 NAT mapping of network
647 addresses. It maps the network address part, while keeping the host
650 To compile it as a module, choose M here. If unsure, say N.
652 config NETFILTER_XT_TARGET_NFLOG
653 tristate '"NFLOG" target support'
654 default m if NETFILTER_ADVANCED=n
655 select NETFILTER_NETLINK_LOG
657 This option enables the NFLOG target, which allows to LOG
658 messages through nfnetlink_log.
660 To compile it as a module, choose M here. If unsure, say N.
662 config NETFILTER_XT_TARGET_NFQUEUE
663 tristate '"NFQUEUE" target Support'
664 depends on NETFILTER_ADVANCED
665 select NETFILTER_NETLINK_QUEUE
667 This target replaced the old obsolete QUEUE target.
669 As opposed to QUEUE, it supports 65535 different queues,
672 To compile it as a module, choose M here. If unsure, say N.
674 config NETFILTER_XT_TARGET_NOTRACK
675 tristate '"NOTRACK" target support (DEPRECATED)'
676 depends on NF_CONNTRACK
677 depends on IP_NF_RAW || IP6_NF_RAW
678 depends on NETFILTER_ADVANCED
679 select NETFILTER_XT_TARGET_CT
681 config NETFILTER_XT_TARGET_RATEEST
682 tristate '"RATEEST" target support'
683 depends on NETFILTER_ADVANCED
685 This option adds a `RATEEST' target, which allows to measure
686 rates similar to TC estimators. The `rateest' match can be
687 used to match on the measured rates.
689 To compile it as a module, choose M here. If unsure, say N.
691 config NETFILTER_XT_TARGET_REDIRECT
692 tristate "REDIRECT target support"
695 REDIRECT is a special case of NAT: all incoming connections are
696 mapped onto the incoming interface's address, causing the packets to
697 come to the local machine instead of passing through. This is
698 useful for transparent proxies.
700 To compile it as a module, choose M here. If unsure, say N.
702 config NETFILTER_XT_TARGET_TEE
703 tristate '"TEE" - packet cloning to alternate destination'
704 depends on NETFILTER_ADVANCED
705 depends on (IPV6 || IPV6=n)
706 depends on !NF_CONNTRACK || NF_CONNTRACK
708 This option adds a "TEE" target with which a packet can be cloned and
709 this clone be rerouted to another nexthop.
711 config NETFILTER_XT_TARGET_TPROXY
712 tristate '"TPROXY" target transparent proxying support'
713 depends on NETFILTER_XTABLES
714 depends on NETFILTER_ADVANCED
715 depends on IP_NF_MANGLE
716 select NF_DEFRAG_IPV4
717 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
719 This option adds a `TPROXY' target, which is somewhat similar to
720 REDIRECT. It can only be used in the mangle table and is useful
721 to redirect traffic to a transparent proxy. It does _not_ depend
722 on Netfilter connection tracking and NAT, unlike REDIRECT.
723 For it to work you will have to configure certain iptables rules
724 and use policy routing. For more information on how to set it up
725 see Documentation/networking/tproxy.txt.
727 To compile it as a module, choose M here. If unsure, say N.
729 config NETFILTER_XT_TARGET_TRACE
730 tristate '"TRACE" target support'
731 depends on IP_NF_RAW || IP6_NF_RAW
732 depends on NETFILTER_ADVANCED
734 The TRACE target allows you to mark packets so that the kernel
735 will log every rule which match the packets as those traverse
736 the tables, chains, rules.
738 If you want to compile it as a module, say M here and read
739 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
741 config NETFILTER_XT_TARGET_SECMARK
742 tristate '"SECMARK" target support'
743 depends on NETWORK_SECMARK
744 default m if NETFILTER_ADVANCED=n
746 The SECMARK target allows security marking of network
747 packets, for use with security subsystems.
749 To compile it as a module, choose M here. If unsure, say N.
751 config NETFILTER_XT_TARGET_TCPMSS
752 tristate '"TCPMSS" target support'
753 depends on (IPV6 || IPV6=n)
754 default m if NETFILTER_ADVANCED=n
756 This option adds a `TCPMSS' target, which allows you to alter the
757 MSS value of TCP SYN packets, to control the maximum size for that
758 connection (usually limiting it to your outgoing interface's MTU
761 This is used to overcome criminally braindead ISPs or servers which
762 block ICMP Fragmentation Needed packets. The symptoms of this
763 problem are that everything works fine from your Linux
764 firewall/router, but machines behind it can never exchange large
766 1) Web browsers connect, then hang with no data received.
767 2) Small mail works fine, but large emails hang.
768 3) ssh works fine, but scp hangs after initial handshaking.
770 Workaround: activate this option and add a rule to your firewall
773 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
774 -j TCPMSS --clamp-mss-to-pmtu
776 To compile it as a module, choose M here. If unsure, say N.
778 config NETFILTER_XT_TARGET_TCPOPTSTRIP
779 tristate '"TCPOPTSTRIP" target support'
780 depends on IP_NF_MANGLE || IP6_NF_MANGLE
781 depends on NETFILTER_ADVANCED
783 This option adds a "TCPOPTSTRIP" target, which allows you to strip
784 TCP options from TCP packets.
786 # alphabetically ordered list of matches
788 comment "Xtables matches"
790 config NETFILTER_XT_MATCH_ADDRTYPE
791 tristate '"addrtype" address type match support'
792 depends on NETFILTER_ADVANCED
794 This option allows you to match what routing thinks of an address,
795 eg. UNICAST, LOCAL, BROADCAST, ...
797 If you want to compile it as a module, say M here and read
798 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
800 config NETFILTER_XT_MATCH_BPF
801 tristate '"bpf" match support'
802 depends on NETFILTER_ADVANCED
804 BPF matching applies a linux socket filter to each packet and
805 accepts those for which the filter returns non-zero.
807 To compile it as a module, choose M here. If unsure, say N.
809 config NETFILTER_XT_MATCH_CLUSTER
810 tristate '"cluster" match support'
811 depends on NF_CONNTRACK
812 depends on NETFILTER_ADVANCED
814 This option allows you to build work-load-sharing clusters of
815 network servers/stateful firewalls without having a dedicated
816 load-balancing router/server/switch. Basically, this match returns
817 true when the packet must be handled by this cluster node. Thus,
818 all nodes see all packets and this match decides which node handles
819 what packets. The work-load sharing algorithm is based on source
822 If you say Y or M here, try `iptables -m cluster --help` for
825 config NETFILTER_XT_MATCH_COMMENT
826 tristate '"comment" match support'
827 depends on NETFILTER_ADVANCED
829 This option adds a `comment' dummy-match, which allows you to put
830 comments in your iptables ruleset.
832 If you want to compile it as a module, say M here and read
833 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
835 config NETFILTER_XT_MATCH_CONNBYTES
836 tristate '"connbytes" per-connection counter match support'
837 depends on NF_CONNTRACK
838 depends on NETFILTER_ADVANCED
840 This option adds a `connbytes' match, which allows you to match the
841 number of bytes and/or packets for each direction within a connection.
843 If you want to compile it as a module, say M here and read
844 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
846 config NETFILTER_XT_MATCH_CONNLABEL
847 tristate '"connlabel" match support'
848 select NF_CONNTRACK_LABELS
849 depends on NF_CONNTRACK
850 depends on NETFILTER_ADVANCED
852 This match allows you to test and assign userspace-defined labels names
853 to a connection. The kernel only stores bit values - mapping
854 names to bits is done by userspace.
856 Unlike connmark, more than 32 flag bits may be assigned to a
857 connection simultaneously.
859 config NETFILTER_XT_MATCH_CONNLIMIT
860 tristate '"connlimit" match support"'
861 depends on NF_CONNTRACK
862 depends on NETFILTER_ADVANCED
864 This match allows you to match against the number of parallel
865 connections to a server per client IP address (or address block).
867 config NETFILTER_XT_MATCH_CONNMARK
868 tristate '"connmark" connection mark match support'
869 depends on NF_CONNTRACK
870 depends on NETFILTER_ADVANCED
871 select NETFILTER_XT_CONNMARK
873 This is a backwards-compat option for the user's convenience
874 (e.g. when running oldconfig). It selects
875 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
877 config NETFILTER_XT_MATCH_CONNTRACK
878 tristate '"conntrack" connection tracking match support'
879 depends on NF_CONNTRACK
880 default m if NETFILTER_ADVANCED=n
882 This is a general conntrack match module, a superset of the state match.
884 It allows matching on additional conntrack information, which is
885 useful in complex configurations, such as NAT gateways with multiple
886 internet links or tunnels.
888 To compile it as a module, choose M here. If unsure, say N.
890 config NETFILTER_XT_MATCH_CPU
891 tristate '"cpu" match support'
892 depends on NETFILTER_ADVANCED
894 CPU matching allows you to match packets based on the CPU
895 currently handling the packet.
897 To compile it as a module, choose M here. If unsure, say N.
899 config NETFILTER_XT_MATCH_DCCP
900 tristate '"dccp" protocol match support'
901 depends on NETFILTER_ADVANCED
904 With this option enabled, you will be able to use the iptables
905 `dccp' match in order to match on DCCP source/destination ports
908 If you want to compile it as a module, say M here and read
909 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
911 config NETFILTER_XT_MATCH_DEVGROUP
912 tristate '"devgroup" match support'
913 depends on NETFILTER_ADVANCED
915 This options adds a `devgroup' match, which allows to match on the
916 device group a network device is assigned to.
918 To compile it as a module, choose M here. If unsure, say N.
920 config NETFILTER_XT_MATCH_DSCP
921 tristate '"dscp" and "tos" match support'
922 depends on NETFILTER_ADVANCED
924 This option adds a `DSCP' match, which allows you to match against
925 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
927 The DSCP field can have any value between 0x0 and 0x3f inclusive.
929 It will also add a "tos" match, which allows you to match packets
930 based on the Type Of Service fields of the IPv4 packet (which share
931 the same bits as DSCP).
933 To compile it as a module, choose M here. If unsure, say N.
935 config NETFILTER_XT_MATCH_ECN
936 tristate '"ecn" match support'
937 depends on NETFILTER_ADVANCED
939 This option adds an "ECN" match, which allows you to match against
940 the IPv4 and TCP header ECN fields.
942 To compile it as a module, choose M here. If unsure, say N.
944 config NETFILTER_XT_MATCH_ESP
945 tristate '"esp" match support'
946 depends on NETFILTER_ADVANCED
948 This match extension allows you to match a range of SPIs
949 inside ESP header of IPSec packets.
951 To compile it as a module, choose M here. If unsure, say N.
953 config NETFILTER_XT_MATCH_HASHLIMIT
954 tristate '"hashlimit" match support'
955 depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
956 depends on NETFILTER_ADVANCED
958 This option adds a `hashlimit' match.
960 As opposed to `limit', this match dynamically creates a hash table
961 of limit buckets, based on your selection of source/destination
962 addresses and/or ports.
964 It enables you to express policies like `10kpps for any given
965 destination address' or `500pps from any given source address'
968 config NETFILTER_XT_MATCH_HELPER
969 tristate '"helper" match support'
970 depends on NF_CONNTRACK
971 depends on NETFILTER_ADVANCED
973 Helper matching allows you to match packets in dynamic connections
974 tracked by a conntrack-helper, ie. ip_conntrack_ftp
976 To compile it as a module, choose M here. If unsure, say Y.
978 config NETFILTER_XT_MATCH_HL
979 tristate '"hl" hoplimit/TTL match support'
980 depends on NETFILTER_ADVANCED
982 HL matching allows you to match packets based on the hoplimit
983 in the IPv6 header, or the time-to-live field in the IPv4
984 header of the packet.
986 config NETFILTER_XT_MATCH_IPRANGE
987 tristate '"iprange" address range match support'
988 depends on NETFILTER_ADVANCED
990 This option adds a "iprange" match, which allows you to match based on
991 an IP address range. (Normal iptables only matches on single addresses
992 with an optional mask.)
996 config NETFILTER_XT_MATCH_IPVS
997 tristate '"ipvs" match support'
999 depends on NETFILTER_ADVANCED
1000 depends on NF_CONNTRACK
1002 This option allows you to match against IPVS properties of a packet.
1006 config NETFILTER_XT_MATCH_LENGTH
1007 tristate '"length" match support'
1008 depends on NETFILTER_ADVANCED
1010 This option allows you to match the length of a packet against a
1011 specific value or range of values.
1013 To compile it as a module, choose M here. If unsure, say N.
1015 config NETFILTER_XT_MATCH_LIMIT
1016 tristate '"limit" match support'
1017 depends on NETFILTER_ADVANCED
1019 limit matching allows you to control the rate at which a rule can be
1020 matched: mainly useful in combination with the LOG target ("LOG
1021 target support", below) and to avoid some Denial of Service attacks.
1023 To compile it as a module, choose M here. If unsure, say N.
1025 config NETFILTER_XT_MATCH_MAC
1026 tristate '"mac" address match support'
1027 depends on NETFILTER_ADVANCED
1029 MAC matching allows you to match packets based on the source
1030 Ethernet address of the packet.
1032 To compile it as a module, choose M here. If unsure, say N.
1034 config NETFILTER_XT_MATCH_MARK
1035 tristate '"mark" match support'
1036 depends on NETFILTER_ADVANCED
1037 select NETFILTER_XT_MARK
1039 This is a backwards-compat option for the user's convenience
1040 (e.g. when running oldconfig). It selects
1041 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
1043 config NETFILTER_XT_MATCH_MULTIPORT
1044 tristate '"multiport" Multiple port match support'
1045 depends on NETFILTER_ADVANCED
1047 Multiport matching allows you to match TCP or UDP packets based on
1048 a series of source or destination ports: normally a rule can only
1049 match a single range of ports.
1051 To compile it as a module, choose M here. If unsure, say N.
1053 config NETFILTER_XT_MATCH_NFACCT
1054 tristate '"nfacct" match support'
1055 depends on NETFILTER_ADVANCED
1056 select NETFILTER_NETLINK_ACCT
1058 This option allows you to use the extended accounting through
1061 To compile it as a module, choose M here. If unsure, say N.
1063 config NETFILTER_XT_MATCH_OSF
1064 tristate '"osf" Passive OS fingerprint match'
1065 depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
1067 This option selects the Passive OS Fingerprinting match module
1068 that allows to passively match the remote operating system by
1069 analyzing incoming TCP SYN packets.
1071 Rules and loading software can be downloaded from
1072 http://www.ioremap.net/projects/osf
1074 To compile it as a module, choose M here. If unsure, say N.
1076 config NETFILTER_XT_MATCH_OWNER
1077 tristate '"owner" match support'
1078 depends on NETFILTER_ADVANCED
1080 Socket owner matching allows you to match locally-generated packets
1081 based on who created the socket: the user or group. It is also
1082 possible to check whether a socket actually exists.
1084 config NETFILTER_XT_MATCH_POLICY
1085 tristate 'IPsec "policy" match support'
1087 default m if NETFILTER_ADVANCED=n
1089 Policy matching allows you to match packets based on the
1090 IPsec policy that was used during decapsulation/will
1091 be used during encapsulation.
1093 To compile it as a module, choose M here. If unsure, say N.
1095 config NETFILTER_XT_MATCH_PHYSDEV
1096 tristate '"physdev" match support'
1097 depends on BRIDGE && BRIDGE_NETFILTER
1098 depends on NETFILTER_ADVANCED
1100 Physdev packet matching matches against the physical bridge ports
1101 the IP packet arrived on or will leave by.
1103 To compile it as a module, choose M here. If unsure, say N.
1105 config NETFILTER_XT_MATCH_PKTTYPE
1106 tristate '"pkttype" packet type match support'
1107 depends on NETFILTER_ADVANCED
1109 Packet type matching allows you to match a packet by
1110 its "class", eg. BROADCAST, MULTICAST, ...
1113 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
1115 To compile it as a module, choose M here. If unsure, say N.
1117 config NETFILTER_XT_MATCH_QUOTA
1118 tristate '"quota" match support'
1119 depends on NETFILTER_ADVANCED
1121 This option adds a `quota' match, which allows to match on a
1124 If you want to compile it as a module, say M here and read
1125 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1127 config NETFILTER_XT_MATCH_RATEEST
1128 tristate '"rateest" match support'
1129 depends on NETFILTER_ADVANCED
1130 select NETFILTER_XT_TARGET_RATEEST
1132 This option adds a `rateest' match, which allows to match on the
1133 rate estimated by the RATEEST target.
1135 To compile it as a module, choose M here. If unsure, say N.
1137 config NETFILTER_XT_MATCH_REALM
1138 tristate '"realm" match support'
1139 depends on NETFILTER_ADVANCED
1140 select IP_ROUTE_CLASSID
1142 This option adds a `realm' match, which allows you to use the realm
1143 key from the routing subsystem inside iptables.
1145 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
1148 If you want to compile it as a module, say M here and read
1149 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1151 config NETFILTER_XT_MATCH_RECENT
1152 tristate '"recent" match support'
1153 depends on NETFILTER_ADVANCED
1155 This match is used for creating one or many lists of recently
1156 used addresses and then matching against that/those list(s).
1158 Short options are available by using 'iptables -m recent -h'
1159 Official Website: <http://snowman.net/projects/ipt_recent/>
1161 config NETFILTER_XT_MATCH_SCTP
1162 tristate '"sctp" protocol match support'
1163 depends on NETFILTER_ADVANCED
1166 With this option enabled, you will be able to use the
1167 `sctp' match in order to match on SCTP source/destination ports
1168 and SCTP chunk types.
1170 If you want to compile it as a module, say M here and read
1171 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1173 config NETFILTER_XT_MATCH_SOCKET
1174 tristate '"socket" match support'
1175 depends on NETFILTER_XTABLES
1176 depends on NETFILTER_ADVANCED
1177 depends on !NF_CONNTRACK || NF_CONNTRACK
1178 depends on (IPV6 || IPV6=n)
1179 select NF_DEFRAG_IPV4
1180 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
1182 This option adds a `socket' match, which can be used to match
1183 packets for which a TCP or UDP socket lookup finds a valid socket.
1184 It can be used in combination with the MARK target and policy
1185 routing to implement full featured non-locally bound sockets.
1187 To compile it as a module, choose M here. If unsure, say N.
1189 config NETFILTER_XT_MATCH_STATE
1190 tristate '"state" match support'
1191 depends on NF_CONNTRACK
1192 default m if NETFILTER_ADVANCED=n
1194 Connection state matching allows you to match packets based on their
1195 relationship to a tracked connection (ie. previous packets). This
1196 is a powerful tool for packet classification.
1198 To compile it as a module, choose M here. If unsure, say N.
1200 config NETFILTER_XT_MATCH_STATISTIC
1201 tristate '"statistic" match support'
1202 depends on NETFILTER_ADVANCED
1204 This option adds a `statistic' match, which allows you to match
1205 on packets periodically or randomly with a given percentage.
1207 To compile it as a module, choose M here. If unsure, say N.
1209 config NETFILTER_XT_MATCH_STRING
1210 tristate '"string" match support'
1211 depends on NETFILTER_ADVANCED
1213 select TEXTSEARCH_KMP
1214 select TEXTSEARCH_BM
1215 select TEXTSEARCH_FSM
1217 This option adds a `string' match, which allows you to look for
1218 pattern matchings in packets.
1220 To compile it as a module, choose M here. If unsure, say N.
1222 config NETFILTER_XT_MATCH_TCPMSS
1223 tristate '"tcpmss" match support'
1224 depends on NETFILTER_ADVANCED
1226 This option adds a `tcpmss' match, which allows you to examine the
1227 MSS value of TCP SYN packets, which control the maximum packet size
1228 for that connection.
1230 To compile it as a module, choose M here. If unsure, say N.
1232 config NETFILTER_XT_MATCH_TIME
1233 tristate '"time" match support'
1234 depends on NETFILTER_ADVANCED
1236 This option adds a "time" match, which allows you to match based on
1237 the packet arrival time (at the machine which netfilter is running)
1238 on) or departure time/date (for locally generated packets).
1240 If you say Y here, try `iptables -m time --help` for
1243 If you want to compile it as a module, say M here.
1246 config NETFILTER_XT_MATCH_U32
1247 tristate '"u32" match support'
1248 depends on NETFILTER_ADVANCED
1250 u32 allows you to extract quantities of up to 4 bytes from a packet,
1251 AND them with specified masks, shift them by specified amounts and
1252 test whether the results are in any of a set of specified ranges.
1253 The specification of what to extract is general enough to skip over
1254 headers with lengths stored in the packet, as in IP or TCP header
1257 Details and examples are in the kernel module source.
1259 endif # NETFILTER_XTABLES
1263 source "net/netfilter/ipset/Kconfig"
1265 source "net/netfilter/ipvs/Kconfig"