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_TIMESTAMP
107 bool 'Connection tracking timestamping'
108 depends on NETFILTER_ADVANCED
110 This option enables support for connection tracking timestamping.
111 This allows you to store the flow start-time and to obtain
112 the flow-stop time (once it has been destroyed) via Connection
117 config NF_CT_PROTO_DCCP
118 tristate 'DCCP protocol connection tracking support (EXPERIMENTAL)'
119 depends on EXPERIMENTAL
120 depends on NETFILTER_ADVANCED
123 With this option enabled, the layer 3 independent connection
124 tracking code will be able to do state tracking on DCCP connections.
128 config NF_CT_PROTO_GRE
131 config NF_CT_PROTO_SCTP
132 tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
133 depends on EXPERIMENTAL
134 depends on NETFILTER_ADVANCED
137 With this option enabled, the layer 3 independent connection
138 tracking code will be able to do state tracking on SCTP connections.
140 If you want to compile it as a module, say M here and read
141 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
143 config NF_CT_PROTO_UDPLITE
144 tristate 'UDP-Lite protocol connection tracking support'
145 depends on NETFILTER_ADVANCED
147 With this option enabled, the layer 3 independent connection
148 tracking code will be able to do state tracking on UDP-Lite
151 To compile it as a module, choose M here. If unsure, say N.
153 config NF_CONNTRACK_AMANDA
154 tristate "Amanda backup protocol support"
155 depends on NETFILTER_ADVANCED
157 select TEXTSEARCH_KMP
159 If you are running the Amanda backup package <http://www.amanda.org/>
160 on this machine or machines that will be MASQUERADED through this
161 machine, then you may want to enable this feature. This allows the
162 connection tracking and natting code to allow the sub-channels that
163 Amanda requires for communication of the backup data, messages and
166 To compile it as a module, choose M here. If unsure, say N.
168 config NF_CONNTRACK_FTP
169 tristate "FTP protocol support"
170 default m if NETFILTER_ADVANCED=n
172 Tracking FTP connections is problematic: special helpers are
173 required for tracking them, and doing masquerading and other forms
174 of Network Address Translation on them.
176 This is FTP support on Layer 3 independent connection tracking.
177 Layer 3 independent connection tracking is experimental scheme
178 which generalize ip_conntrack to support other layer 3 protocols.
180 To compile it as a module, choose M here. If unsure, say N.
182 config NF_CONNTRACK_H323
183 tristate "H.323 protocol support"
184 depends on (IPV6 || IPV6=n)
185 depends on NETFILTER_ADVANCED
187 H.323 is a VoIP signalling protocol from ITU-T. As one of the most
188 important VoIP protocols, it is widely used by voice hardware and
189 software including voice gateways, IP phones, Netmeeting, OpenPhone,
192 With this module you can support H.323 on a connection tracking/NAT
195 This module supports RAS, Fast Start, H.245 Tunnelling, Call
196 Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
197 whiteboard, file transfer, etc. For more information, please
198 visit http://nath323.sourceforge.net/.
200 To compile it as a module, choose M here. If unsure, say N.
202 config NF_CONNTRACK_IRC
203 tristate "IRC protocol support"
204 default m if NETFILTER_ADVANCED=n
206 There is a commonly-used extension to IRC called
207 Direct Client-to-Client Protocol (DCC). This enables users to send
208 files to each other, and also chat to each other without the need
209 of a server. DCC Sending is used anywhere you send files over IRC,
210 and DCC Chat is most commonly used by Eggdrop bots. If you are
211 using NAT, this extension will enable you to send files and initiate
212 chats. Note that you do NOT need this extension to get files or
213 have others initiate chats, or everything else in IRC.
215 To compile it as a module, choose M here. If unsure, say N.
217 config NF_CONNTRACK_BROADCAST
220 config NF_CONNTRACK_NETBIOS_NS
221 tristate "NetBIOS name service protocol support"
222 select NF_CONNTRACK_BROADCAST
224 NetBIOS name service requests are sent as broadcast messages from an
225 unprivileged port and responded to with unicast messages to the
226 same port. This make them hard to firewall properly because connection
227 tracking doesn't deal with broadcasts. This helper tracks locally
228 originating NetBIOS name service requests and the corresponding
229 responses. It relies on correct IP address configuration, specifically
230 netmask and broadcast address. When properly configured, the output
231 of "ip address show" should look similar to this:
233 $ ip -4 address show eth0
234 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
235 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
237 To compile it as a module, choose M here. If unsure, say N.
239 config NF_CONNTRACK_SNMP
240 tristate "SNMP service protocol support"
241 depends on NETFILTER_ADVANCED
242 select NF_CONNTRACK_BROADCAST
244 SNMP service requests are sent as broadcast messages from an
245 unprivileged port and responded to with unicast messages to the
246 same port. This make them hard to firewall properly because connection
247 tracking doesn't deal with broadcasts. This helper tracks locally
248 originating SNMP service requests and the corresponding
249 responses. It relies on correct IP address configuration, specifically
250 netmask and broadcast address.
252 To compile it as a module, choose M here. If unsure, say N.
254 config NF_CONNTRACK_PPTP
255 tristate "PPtP protocol support"
256 depends on NETFILTER_ADVANCED
257 select NF_CT_PROTO_GRE
259 This module adds support for PPTP (Point to Point Tunnelling
260 Protocol, RFC2637) connection tracking and NAT.
262 If you are running PPTP sessions over a stateful firewall or NAT
263 box, you may want to enable this feature.
265 Please note that not all PPTP modes of operation are supported yet.
266 Specifically these limitations exist:
267 - Blindly assumes that control connections are always established
268 in PNS->PAC direction. This is a violation of RFC2637.
269 - Only supports a single call within each session
271 To compile it as a module, choose M here. If unsure, say N.
273 config NF_CONNTRACK_SANE
274 tristate "SANE protocol support (EXPERIMENTAL)"
275 depends on EXPERIMENTAL
276 depends on NETFILTER_ADVANCED
278 SANE is a protocol for remote access to scanners as implemented
279 by the 'saned' daemon. Like FTP, it uses separate control and
282 With this module you can support SANE on a connection tracking
285 To compile it as a module, choose M here. If unsure, say N.
287 config NF_CONNTRACK_SIP
288 tristate "SIP protocol support"
289 default m if NETFILTER_ADVANCED=n
291 SIP is an application-layer control protocol that can establish,
292 modify, and terminate multimedia sessions (conferences) such as
293 Internet telephony calls. With the ip_conntrack_sip and
294 the nf_nat_sip modules you can support the protocol on a connection
295 tracking/NATing firewall.
297 To compile it as a module, choose M here. If unsure, say N.
299 config NF_CONNTRACK_TFTP
300 tristate "TFTP protocol support"
301 depends on NETFILTER_ADVANCED
303 TFTP connection tracking helper, this is required depending
304 on how restrictive your ruleset is.
305 If you are using a tftp client behind -j SNAT or -j MASQUERADING
308 To compile it as a module, choose M here. If unsure, say N.
311 tristate 'Connection tracking netlink interface'
312 select NETFILTER_NETLINK
313 default m if NETFILTER_ADVANCED=n
315 This option enables support for a netlink-based userspace interface
319 # transparent proxy support
320 config NETFILTER_TPROXY
321 tristate "Transparent proxying support (EXPERIMENTAL)"
322 depends on EXPERIMENTAL
323 depends on IP_NF_MANGLE
324 depends on NETFILTER_ADVANCED
326 This option enables transparent proxying support, that is,
327 support for handling non-locally bound IPv4 TCP and UDP sockets.
328 For it to work you will have to configure certain iptables rules
329 and use policy routing. For more information on how to set it up
330 see Documentation/networking/tproxy.txt.
332 To compile it as a module, choose M here. If unsure, say N.
334 config NETFILTER_XTABLES
335 tristate "Netfilter Xtables support (required for ip_tables)"
336 default m if NETFILTER_ADVANCED=n
338 This is required if you intend to use any of ip_tables,
339 ip6_tables or arp_tables.
343 comment "Xtables combined modules"
345 config NETFILTER_XT_MARK
346 tristate 'nfmark target and match support'
347 default m if NETFILTER_ADVANCED=n
349 This option adds the "MARK" target and "mark" match.
351 Netfilter mark matching allows you to match packets based on the
352 "nfmark" value in the packet.
353 The target allows you to create rules in the "mangle" table which alter
354 the netfilter mark (nfmark) field associated with the packet.
356 Prior to routing, the nfmark can influence the routing method (see
357 "Use netfilter MARK value as routing key") and can also be used by
358 other subsystems to change their behavior.
360 config NETFILTER_XT_CONNMARK
361 tristate 'ctmark target and match support'
362 depends on NF_CONNTRACK
363 depends on NETFILTER_ADVANCED
364 select NF_CONNTRACK_MARK
366 This option adds the "CONNMARK" target and "connmark" match.
368 Netfilter allows you to store a mark value per connection (a.k.a.
369 ctmark), similarly to the packet mark (nfmark). Using this
370 target and match, you can set and match on this mark.
372 config NETFILTER_XT_SET
373 tristate 'set target and match support'
375 depends on NETFILTER_ADVANCED
377 This option adds the "SET" target and "set" match.
379 Using this target and match, you can add/delete and match
380 elements in the sets created by ipset(8).
382 To compile it as a module, choose M here. If unsure, say N.
384 # alphabetically ordered list of targets
386 comment "Xtables targets"
388 config NETFILTER_XT_TARGET_AUDIT
389 tristate "AUDIT target support"
391 depends on NETFILTER_ADVANCED
393 This option adds a 'AUDIT' target, which can be used to create
394 audit records for packets dropped/accepted.
396 To compileit as a module, choose M here. If unsure, say N.
398 config NETFILTER_XT_TARGET_CHECKSUM
399 tristate "CHECKSUM target support"
400 depends on IP_NF_MANGLE || IP6_NF_MANGLE
401 depends on NETFILTER_ADVANCED
403 This option adds a `CHECKSUM' target, which can be used in the iptables mangle
406 You can use this target to compute and fill in the checksum in
407 a packet that lacks a checksum. This is particularly useful,
408 if you need to work around old applications such as dhcp clients,
409 that do not work well with checksum offloads, but don't want to disable
410 checksum offload in your device.
412 To compile it as a module, choose M here. If unsure, say N.
414 config NETFILTER_XT_TARGET_CLASSIFY
415 tristate '"CLASSIFY" target support'
416 depends on NETFILTER_ADVANCED
418 This option adds a `CLASSIFY' target, which enables the user to set
419 the priority of a packet. Some qdiscs can use this value for
420 classification, among these are:
422 atm, cbq, dsmark, pfifo_fast, htb, prio
424 To compile it as a module, choose M here. If unsure, say N.
426 config NETFILTER_XT_TARGET_CONNMARK
427 tristate '"CONNMARK" target support'
428 depends on NF_CONNTRACK
429 depends on NETFILTER_ADVANCED
430 select NETFILTER_XT_CONNMARK
432 This is a backwards-compat option for the user's convenience
433 (e.g. when running oldconfig). It selects
434 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
436 config NETFILTER_XT_TARGET_CONNSECMARK
437 tristate '"CONNSECMARK" target support'
438 depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
439 default m if NETFILTER_ADVANCED=n
441 The CONNSECMARK target copies security markings from packets
442 to connections, and restores security markings from connections
443 to packets (if the packets are not already marked). This would
444 normally be used in conjunction with the SECMARK target.
446 To compile it as a module, choose M here. If unsure, say N.
448 config NETFILTER_XT_TARGET_CT
449 tristate '"CT" target support'
450 depends on NF_CONNTRACK
451 depends on IP_NF_RAW || IP6_NF_RAW
452 depends on NETFILTER_ADVANCED
454 This options adds a `CT' target, which allows to specify initial
455 connection tracking parameters like events to be delivered and
456 the helper to be used.
458 To compile it as a module, choose M here. If unsure, say N.
460 config NETFILTER_XT_TARGET_DSCP
461 tristate '"DSCP" and "TOS" target support'
462 depends on IP_NF_MANGLE || IP6_NF_MANGLE
463 depends on NETFILTER_ADVANCED
465 This option adds a `DSCP' target, which allows you to manipulate
466 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
468 The DSCP field can have any value between 0x0 and 0x3f inclusive.
470 It also adds the "TOS" target, which allows you to create rules in
471 the "mangle" table which alter the Type Of Service field of an IPv4
472 or the Priority field of an IPv6 packet, prior to routing.
474 To compile it as a module, choose M here. If unsure, say N.
476 config NETFILTER_XT_TARGET_HL
477 tristate '"HL" hoplimit target support'
478 depends on IP_NF_MANGLE || IP6_NF_MANGLE
479 depends on NETFILTER_ADVANCED
481 This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
482 targets, which enable the user to change the
483 hoplimit/time-to-live value of the IP header.
485 While it is safe to decrement the hoplimit/TTL value, the
486 modules also allow to increment and set the hoplimit value of
487 the header to arbitrary values. This is EXTREMELY DANGEROUS
488 since you can easily create immortal packets that loop
489 forever on the network.
491 config NETFILTER_XT_TARGET_IDLETIMER
492 tristate "IDLETIMER target support"
493 depends on NETFILTER_ADVANCED
496 This option adds the `IDLETIMER' target. Each matching packet
497 resets the timer associated with label specified when the rule is
498 added. When the timer expires, it triggers a sysfs notification.
499 The remaining time for expiration can be read via sysfs.
501 To compile it as a module, choose M here. If unsure, say N.
503 config NETFILTER_XT_TARGET_LED
504 tristate '"LED" target support'
505 depends on LEDS_CLASS && LEDS_TRIGGERS
506 depends on NETFILTER_ADVANCED
508 This option adds a `LED' target, which allows you to blink LEDs in
509 response to particular packets passing through your machine.
511 This can be used to turn a spare LED into a network activity LED,
512 which only flashes in response to FTP transfers, for example. Or
513 you could have an LED which lights up for a minute or two every time
514 somebody connects to your machine via SSH.
516 You will need support for the "led" class to make this work.
518 To create an LED trigger for incoming SSH traffic:
519 iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
521 Then attach the new trigger to an LED on your system:
522 echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
524 For more information on the LEDs available on your system, see
525 Documentation/leds/leds-class.txt
527 config NETFILTER_XT_TARGET_MARK
528 tristate '"MARK" target support'
529 depends on NETFILTER_ADVANCED
530 select NETFILTER_XT_MARK
532 This is a backwards-compat option for the user's convenience
533 (e.g. when running oldconfig). It selects
534 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
536 config NETFILTER_XT_TARGET_NFLOG
537 tristate '"NFLOG" target support'
538 default m if NETFILTER_ADVANCED=n
539 select NETFILTER_NETLINK_LOG
541 This option enables the NFLOG target, which allows to LOG
542 messages through nfnetlink_log.
544 To compile it as a module, choose M here. If unsure, say N.
546 config NETFILTER_XT_TARGET_NFQUEUE
547 tristate '"NFQUEUE" target Support'
548 depends on NETFILTER_ADVANCED
549 select NETFILTER_NETLINK_QUEUE
551 This target replaced the old obsolete QUEUE target.
553 As opposed to QUEUE, it supports 65535 different queues,
556 To compile it as a module, choose M here. If unsure, say N.
558 config NETFILTER_XT_TARGET_NOTRACK
559 tristate '"NOTRACK" target support'
560 depends on IP_NF_RAW || IP6_NF_RAW
561 depends on NF_CONNTRACK
563 The NOTRACK target allows a select rule to specify
564 which packets *not* to enter the conntrack/NAT
565 subsystem with all the consequences (no ICMP error tracking,
566 no protocol helpers for the selected packets).
568 If you want to compile it as a module, say M here and read
569 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
571 config NETFILTER_XT_TARGET_RATEEST
572 tristate '"RATEEST" target support'
573 depends on NETFILTER_ADVANCED
575 This option adds a `RATEEST' target, which allows to measure
576 rates similar to TC estimators. The `rateest' match can be
577 used to match on the measured rates.
579 To compile it as a module, choose M here. If unsure, say N.
581 config NETFILTER_XT_TARGET_TEE
582 tristate '"TEE" - packet cloning to alternate destination'
583 depends on NETFILTER_ADVANCED
584 depends on (IPV6 || IPV6=n)
585 depends on !NF_CONNTRACK || NF_CONNTRACK
587 This option adds a "TEE" target with which a packet can be cloned and
588 this clone be rerouted to another nexthop.
590 config NETFILTER_XT_TARGET_TPROXY
591 tristate '"TPROXY" target support (EXPERIMENTAL)'
592 depends on EXPERIMENTAL
593 depends on NETFILTER_TPROXY
594 depends on NETFILTER_XTABLES
595 depends on NETFILTER_ADVANCED
596 select NF_DEFRAG_IPV4
597 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
599 This option adds a `TPROXY' target, which is somewhat similar to
600 REDIRECT. It can only be used in the mangle table and is useful
601 to redirect traffic to a transparent proxy. It does _not_ depend
602 on Netfilter connection tracking and NAT, unlike REDIRECT.
604 To compile it as a module, choose M here. If unsure, say N.
606 config NETFILTER_XT_TARGET_TRACE
607 tristate '"TRACE" target support'
608 depends on IP_NF_RAW || IP6_NF_RAW
609 depends on NETFILTER_ADVANCED
611 The TRACE target allows you to mark packets so that the kernel
612 will log every rule which match the packets as those traverse
613 the tables, chains, rules.
615 If you want to compile it as a module, say M here and read
616 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
618 config NETFILTER_XT_TARGET_SECMARK
619 tristate '"SECMARK" target support'
620 depends on NETWORK_SECMARK
621 default m if NETFILTER_ADVANCED=n
623 The SECMARK target allows security marking of network
624 packets, for use with security subsystems.
626 To compile it as a module, choose M here. If unsure, say N.
628 config NETFILTER_XT_TARGET_TCPMSS
629 tristate '"TCPMSS" target support'
630 depends on (IPV6 || IPV6=n)
631 default m if NETFILTER_ADVANCED=n
633 This option adds a `TCPMSS' target, which allows you to alter the
634 MSS value of TCP SYN packets, to control the maximum size for that
635 connection (usually limiting it to your outgoing interface's MTU
638 This is used to overcome criminally braindead ISPs or servers which
639 block ICMP Fragmentation Needed packets. The symptoms of this
640 problem are that everything works fine from your Linux
641 firewall/router, but machines behind it can never exchange large
643 1) Web browsers connect, then hang with no data received.
644 2) Small mail works fine, but large emails hang.
645 3) ssh works fine, but scp hangs after initial handshaking.
647 Workaround: activate this option and add a rule to your firewall
650 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
651 -j TCPMSS --clamp-mss-to-pmtu
653 To compile it as a module, choose M here. If unsure, say N.
655 config NETFILTER_XT_TARGET_TCPOPTSTRIP
656 tristate '"TCPOPTSTRIP" target support (EXPERIMENTAL)'
657 depends on EXPERIMENTAL
658 depends on IP_NF_MANGLE || IP6_NF_MANGLE
659 depends on NETFILTER_ADVANCED
661 This option adds a "TCPOPTSTRIP" target, which allows you to strip
662 TCP options from TCP packets.
664 # alphabetically ordered list of matches
666 comment "Xtables matches"
668 config NETFILTER_XT_MATCH_ADDRTYPE
669 tristate '"addrtype" address type match support'
670 depends on NETFILTER_ADVANCED
672 This option allows you to match what routing thinks of an address,
673 eg. UNICAST, LOCAL, BROADCAST, ...
675 If you want to compile it as a module, say M here and read
676 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
678 config NETFILTER_XT_MATCH_CLUSTER
679 tristate '"cluster" match support'
680 depends on NF_CONNTRACK
681 depends on NETFILTER_ADVANCED
683 This option allows you to build work-load-sharing clusters of
684 network servers/stateful firewalls without having a dedicated
685 load-balancing router/server/switch. Basically, this match returns
686 true when the packet must be handled by this cluster node. Thus,
687 all nodes see all packets and this match decides which node handles
688 what packets. The work-load sharing algorithm is based on source
691 If you say Y or M here, try `iptables -m cluster --help` for
694 config NETFILTER_XT_MATCH_COMMENT
695 tristate '"comment" match support'
696 depends on NETFILTER_ADVANCED
698 This option adds a `comment' dummy-match, which allows you to put
699 comments in your iptables ruleset.
701 If you want to compile it as a module, say M here and read
702 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
704 config NETFILTER_XT_MATCH_CONNBYTES
705 tristate '"connbytes" per-connection counter match support'
706 depends on NF_CONNTRACK
707 depends on NETFILTER_ADVANCED
709 This option adds a `connbytes' match, which allows you to match the
710 number of bytes and/or packets for each direction within a connection.
712 If you want to compile it as a module, say M here and read
713 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
715 config NETFILTER_XT_MATCH_CONNLIMIT
716 tristate '"connlimit" match support"'
717 depends on NF_CONNTRACK
718 depends on NETFILTER_ADVANCED
720 This match allows you to match against the number of parallel
721 connections to a server per client IP address (or address block).
723 config NETFILTER_XT_MATCH_CONNMARK
724 tristate '"connmark" connection mark match support'
725 depends on NF_CONNTRACK
726 depends on NETFILTER_ADVANCED
727 select NETFILTER_XT_CONNMARK
729 This is a backwards-compat option for the user's convenience
730 (e.g. when running oldconfig). It selects
731 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
733 config NETFILTER_XT_MATCH_CONNTRACK
734 tristate '"conntrack" connection tracking match support'
735 depends on NF_CONNTRACK
736 default m if NETFILTER_ADVANCED=n
738 This is a general conntrack match module, a superset of the state match.
740 It allows matching on additional conntrack information, which is
741 useful in complex configurations, such as NAT gateways with multiple
742 internet links or tunnels.
744 To compile it as a module, choose M here. If unsure, say N.
746 config NETFILTER_XT_MATCH_CPU
747 tristate '"cpu" match support'
748 depends on NETFILTER_ADVANCED
750 CPU matching allows you to match packets based on the CPU
751 currently handling the packet.
753 To compile it as a module, choose M here. If unsure, say N.
755 config NETFILTER_XT_MATCH_DCCP
756 tristate '"dccp" protocol match support'
757 depends on NETFILTER_ADVANCED
760 With this option enabled, you will be able to use the iptables
761 `dccp' match in order to match on DCCP source/destination ports
764 If you want to compile it as a module, say M here and read
765 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
767 config NETFILTER_XT_MATCH_DEVGROUP
768 tristate '"devgroup" match support'
769 depends on NETFILTER_ADVANCED
771 This options adds a `devgroup' match, which allows to match on the
772 device group a network device is assigned to.
774 To compile it as a module, choose M here. If unsure, say N.
776 config NETFILTER_XT_MATCH_DSCP
777 tristate '"dscp" and "tos" match support'
778 depends on NETFILTER_ADVANCED
780 This option adds a `DSCP' match, which allows you to match against
781 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
783 The DSCP field can have any value between 0x0 and 0x3f inclusive.
785 It will also add a "tos" match, which allows you to match packets
786 based on the Type Of Service fields of the IPv4 packet (which share
787 the same bits as DSCP).
789 To compile it as a module, choose M here. If unsure, say N.
791 config NETFILTER_XT_MATCH_ECN
792 tristate '"ecn" match support'
793 depends on NETFILTER_ADVANCED
795 This option adds an "ECN" match, which allows you to match against
796 the IPv4 and TCP header ECN fields.
798 To compile it as a module, choose M here. If unsure, say N.
800 config NETFILTER_XT_MATCH_ESP
801 tristate '"esp" match support'
802 depends on NETFILTER_ADVANCED
804 This match extension allows you to match a range of SPIs
805 inside ESP header of IPSec packets.
807 To compile it as a module, choose M here. If unsure, say N.
809 config NETFILTER_XT_MATCH_HASHLIMIT
810 tristate '"hashlimit" match support'
811 depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
812 depends on NETFILTER_ADVANCED
814 This option adds a `hashlimit' match.
816 As opposed to `limit', this match dynamically creates a hash table
817 of limit buckets, based on your selection of source/destination
818 addresses and/or ports.
820 It enables you to express policies like `10kpps for any given
821 destination address' or `500pps from any given source address'
824 config NETFILTER_XT_MATCH_HELPER
825 tristate '"helper" match support'
826 depends on NF_CONNTRACK
827 depends on NETFILTER_ADVANCED
829 Helper matching allows you to match packets in dynamic connections
830 tracked by a conntrack-helper, ie. ip_conntrack_ftp
832 To compile it as a module, choose M here. If unsure, say Y.
834 config NETFILTER_XT_MATCH_HL
835 tristate '"hl" hoplimit/TTL match support'
836 depends on NETFILTER_ADVANCED
838 HL matching allows you to match packets based on the hoplimit
839 in the IPv6 header, or the time-to-live field in the IPv4
840 header of the packet.
842 config NETFILTER_XT_MATCH_IPRANGE
843 tristate '"iprange" address range match support'
844 depends on NETFILTER_ADVANCED
846 This option adds a "iprange" match, which allows you to match based on
847 an IP address range. (Normal iptables only matches on single addresses
848 with an optional mask.)
852 config NETFILTER_XT_MATCH_IPVS
853 tristate '"ipvs" match support'
855 depends on NETFILTER_ADVANCED
856 depends on NF_CONNTRACK
858 This option allows you to match against IPVS properties of a packet.
862 config NETFILTER_XT_MATCH_LENGTH
863 tristate '"length" match support'
864 depends on NETFILTER_ADVANCED
866 This option allows you to match the length of a packet against a
867 specific value or range of values.
869 To compile it as a module, choose M here. If unsure, say N.
871 config NETFILTER_XT_MATCH_LIMIT
872 tristate '"limit" match support'
873 depends on NETFILTER_ADVANCED
875 limit matching allows you to control the rate at which a rule can be
876 matched: mainly useful in combination with the LOG target ("LOG
877 target support", below) and to avoid some Denial of Service attacks.
879 To compile it as a module, choose M here. If unsure, say N.
881 config NETFILTER_XT_MATCH_MAC
882 tristate '"mac" address match support'
883 depends on NETFILTER_ADVANCED
885 MAC matching allows you to match packets based on the source
886 Ethernet address of the packet.
888 To compile it as a module, choose M here. If unsure, say N.
890 config NETFILTER_XT_MATCH_MARK
891 tristate '"mark" match support'
892 depends on NETFILTER_ADVANCED
893 select NETFILTER_XT_MARK
895 This is a backwards-compat option for the user's convenience
896 (e.g. when running oldconfig). It selects
897 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
899 config NETFILTER_XT_MATCH_MULTIPORT
900 tristate '"multiport" Multiple port match support'
901 depends on NETFILTER_ADVANCED
903 Multiport matching allows you to match TCP or UDP packets based on
904 a series of source or destination ports: normally a rule can only
905 match a single range of ports.
907 To compile it as a module, choose M here. If unsure, say N.
909 config NETFILTER_XT_MATCH_NFACCT
910 tristate '"nfacct" match support'
911 depends on NETFILTER_ADVANCED
912 select NETFILTER_NETLINK_ACCT
914 This option allows you to use the extended accounting through
917 To compile it as a module, choose M here. If unsure, say N.
919 config NETFILTER_XT_MATCH_OSF
920 tristate '"osf" Passive OS fingerprint match'
921 depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
923 This option selects the Passive OS Fingerprinting match module
924 that allows to passively match the remote operating system by
925 analyzing incoming TCP SYN packets.
927 Rules and loading software can be downloaded from
928 http://www.ioremap.net/projects/osf
930 To compile it as a module, choose M here. If unsure, say N.
932 config NETFILTER_XT_MATCH_OWNER
933 tristate '"owner" match support'
934 depends on NETFILTER_ADVANCED
936 Socket owner matching allows you to match locally-generated packets
937 based on who created the socket: the user or group. It is also
938 possible to check whether a socket actually exists.
940 config NETFILTER_XT_MATCH_POLICY
941 tristate 'IPsec "policy" match support'
943 default m if NETFILTER_ADVANCED=n
945 Policy matching allows you to match packets based on the
946 IPsec policy that was used during decapsulation/will
947 be used during encapsulation.
949 To compile it as a module, choose M here. If unsure, say N.
951 config NETFILTER_XT_MATCH_PHYSDEV
952 tristate '"physdev" match support'
953 depends on BRIDGE && BRIDGE_NETFILTER
954 depends on NETFILTER_ADVANCED
956 Physdev packet matching matches against the physical bridge ports
957 the IP packet arrived on or will leave by.
959 To compile it as a module, choose M here. If unsure, say N.
961 config NETFILTER_XT_MATCH_PKTTYPE
962 tristate '"pkttype" packet type match support'
963 depends on NETFILTER_ADVANCED
965 Packet type matching allows you to match a packet by
966 its "class", eg. BROADCAST, MULTICAST, ...
969 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
971 To compile it as a module, choose M here. If unsure, say N.
973 config NETFILTER_XT_MATCH_QUOTA
974 tristate '"quota" match support'
975 depends on NETFILTER_ADVANCED
977 This option adds a `quota' match, which allows to match on a
980 If you want to compile it as a module, say M here and read
981 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
983 config NETFILTER_XT_MATCH_RATEEST
984 tristate '"rateest" match support'
985 depends on NETFILTER_ADVANCED
986 select NETFILTER_XT_TARGET_RATEEST
988 This option adds a `rateest' match, which allows to match on the
989 rate estimated by the RATEEST target.
991 To compile it as a module, choose M here. If unsure, say N.
993 config NETFILTER_XT_MATCH_REALM
994 tristate '"realm" match support'
995 depends on NETFILTER_ADVANCED
996 select IP_ROUTE_CLASSID
998 This option adds a `realm' match, which allows you to use the realm
999 key from the routing subsystem inside iptables.
1001 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
1004 If you want to compile it as a module, say M here and read
1005 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1007 config NETFILTER_XT_MATCH_RECENT
1008 tristate '"recent" match support'
1009 depends on NETFILTER_ADVANCED
1011 This match is used for creating one or many lists of recently
1012 used addresses and then matching against that/those list(s).
1014 Short options are available by using 'iptables -m recent -h'
1015 Official Website: <http://snowman.net/projects/ipt_recent/>
1017 config NETFILTER_XT_MATCH_SCTP
1018 tristate '"sctp" protocol match support (EXPERIMENTAL)'
1019 depends on EXPERIMENTAL
1020 depends on NETFILTER_ADVANCED
1023 With this option enabled, you will be able to use the
1024 `sctp' match in order to match on SCTP source/destination ports
1025 and SCTP chunk types.
1027 If you want to compile it as a module, say M here and read
1028 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1030 config NETFILTER_XT_MATCH_SOCKET
1031 tristate '"socket" match support (EXPERIMENTAL)'
1032 depends on EXPERIMENTAL
1033 depends on NETFILTER_TPROXY
1034 depends on NETFILTER_XTABLES
1035 depends on NETFILTER_ADVANCED
1036 depends on !NF_CONNTRACK || NF_CONNTRACK
1037 select NF_DEFRAG_IPV4
1038 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
1040 This option adds a `socket' match, which can be used to match
1041 packets for which a TCP or UDP socket lookup finds a valid socket.
1042 It can be used in combination with the MARK target and policy
1043 routing to implement full featured non-locally bound sockets.
1045 To compile it as a module, choose M here. If unsure, say N.
1047 config NETFILTER_XT_MATCH_STATE
1048 tristate '"state" match support'
1049 depends on NF_CONNTRACK
1050 default m if NETFILTER_ADVANCED=n
1052 Connection state matching allows you to match packets based on their
1053 relationship to a tracked connection (ie. previous packets). This
1054 is a powerful tool for packet classification.
1056 To compile it as a module, choose M here. If unsure, say N.
1058 config NETFILTER_XT_MATCH_STATISTIC
1059 tristate '"statistic" match support'
1060 depends on NETFILTER_ADVANCED
1062 This option adds a `statistic' match, which allows you to match
1063 on packets periodically or randomly with a given percentage.
1065 To compile it as a module, choose M here. If unsure, say N.
1067 config NETFILTER_XT_MATCH_STRING
1068 tristate '"string" match support'
1069 depends on NETFILTER_ADVANCED
1071 select TEXTSEARCH_KMP
1072 select TEXTSEARCH_BM
1073 select TEXTSEARCH_FSM
1075 This option adds a `string' match, which allows you to look for
1076 pattern matchings in packets.
1078 To compile it as a module, choose M here. If unsure, say N.
1080 config NETFILTER_XT_MATCH_TCPMSS
1081 tristate '"tcpmss" match support'
1082 depends on NETFILTER_ADVANCED
1084 This option adds a `tcpmss' match, which allows you to examine the
1085 MSS value of TCP SYN packets, which control the maximum packet size
1086 for that connection.
1088 To compile it as a module, choose M here. If unsure, say N.
1090 config NETFILTER_XT_MATCH_TIME
1091 tristate '"time" match support'
1092 depends on NETFILTER_ADVANCED
1094 This option adds a "time" match, which allows you to match based on
1095 the packet arrival time (at the machine which netfilter is running)
1096 on) or departure time/date (for locally generated packets).
1098 If you say Y here, try `iptables -m time --help` for
1101 If you want to compile it as a module, say M here.
1104 config NETFILTER_XT_MATCH_U32
1105 tristate '"u32" match support'
1106 depends on NETFILTER_ADVANCED
1108 u32 allows you to extract quantities of up to 4 bytes from a packet,
1109 AND them with specified masks, shift them by specified amounts and
1110 test whether the results are in any of a set of specified ranges.
1111 The specification of what to extract is general enough to skip over
1112 headers with lengths stored in the packet, as in IP or TCP header
1115 Details and examples are in the kernel module source.
1117 endif # NETFILTER_XTABLES
1121 source "net/netfilter/ipset/Kconfig"
1123 source "net/netfilter/ipvs/Kconfig"