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.
54 config NF_CONNTRACK_MARK
55 bool 'Connection mark tracking support'
56 depends on NETFILTER_ADVANCED
58 This option enables support for connection marks, used by the
59 `CONNMARK' target and `connmark' match. Similar to the mark value
60 of packets, but this mark value is kept in the conntrack session
61 instead of the individual packets.
63 config NF_CONNTRACK_SECMARK
64 bool 'Connection tracking security mark support'
65 depends on NETWORK_SECMARK
66 default m if NETFILTER_ADVANCED=n
68 This option enables security markings to be applied to
69 connections. Typically they are copied to connections from
70 packets using the CONNSECMARK target and copied back from
71 connections to packets with the same target, with the packets
72 being originally labeled via SECMARK.
76 config NF_CONNTRACK_ZONES
77 bool 'Connection tracking zones'
78 depends on NETFILTER_ADVANCED
79 depends on NETFILTER_XT_TARGET_CT
81 This option enables support for connection tracking zones.
82 Normally, each connection needs to have a unique system wide
83 identity. Connection tracking zones allow to have multiple
84 connections using the same identity, as long as they are
85 contained in different zones.
89 config NF_CONNTRACK_PROCFS
90 bool "Supply CT list in procfs (OBSOLETE)"
94 This option enables for the list of known conntrack entries
95 to be shown in procfs under net/netfilter/nf_conntrack. This
96 is considered obsolete in favor of using the conntrack(8)
97 tool which uses Netlink.
99 config NF_CONNTRACK_EVENTS
100 bool "Connection tracking events"
101 depends on NETFILTER_ADVANCED
103 If this option is enabled, the connection tracking code will
104 provide a notifier chain that can be used by other kernel code
105 to get notified about changes in the connection tracking state.
109 config NF_CONNTRACK_TIMEOUT
110 bool 'Connection tracking timeout'
111 depends on NETFILTER_ADVANCED
113 This option enables support for connection tracking timeout
114 extension. This allows you to attach timeout policies to flow
119 config NF_CONNTRACK_TIMESTAMP
120 bool 'Connection tracking timestamping'
121 depends on NETFILTER_ADVANCED
123 This option enables support for connection tracking timestamping.
124 This allows you to store the flow start-time and to obtain
125 the flow-stop time (once it has been destroyed) via Connection
130 config NF_CONNTRACK_LABELS
133 This option enables support for assigning user-defined flag bits
134 to connection tracking entries. It selected by the connlabel match.
136 config NF_CT_PROTO_DCCP
137 tristate 'DCCP protocol connection tracking support'
138 depends on NETFILTER_ADVANCED
141 With this option enabled, the layer 3 independent connection
142 tracking code will be able to do state tracking on DCCP connections.
146 config NF_CT_PROTO_GRE
149 config NF_CT_PROTO_SCTP
150 tristate 'SCTP protocol connection tracking support'
151 depends on NETFILTER_ADVANCED
154 With this option enabled, the layer 3 independent connection
155 tracking code will be able to do state tracking on SCTP connections.
157 If you want to compile it as a module, say M here and read
158 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
160 config NF_CT_PROTO_UDPLITE
161 tristate 'UDP-Lite protocol connection tracking support'
162 depends on NETFILTER_ADVANCED
164 With this option enabled, the layer 3 independent connection
165 tracking code will be able to do state tracking on UDP-Lite
168 To compile it as a module, choose M here. If unsure, say N.
170 config NF_CONNTRACK_AMANDA
171 tristate "Amanda backup protocol support"
172 depends on NETFILTER_ADVANCED
174 select TEXTSEARCH_KMP
176 If you are running the Amanda backup package <http://www.amanda.org/>
177 on this machine or machines that will be MASQUERADED through this
178 machine, then you may want to enable this feature. This allows the
179 connection tracking and natting code to allow the sub-channels that
180 Amanda requires for communication of the backup data, messages and
183 To compile it as a module, choose M here. If unsure, say N.
185 config NF_CONNTRACK_FTP
186 tristate "FTP protocol support"
187 default m if NETFILTER_ADVANCED=n
189 Tracking FTP connections is problematic: special helpers are
190 required for tracking them, and doing masquerading and other forms
191 of Network Address Translation on them.
193 This is FTP support on Layer 3 independent connection tracking.
194 Layer 3 independent connection tracking is experimental scheme
195 which generalize ip_conntrack to support other layer 3 protocols.
197 To compile it as a module, choose M here. If unsure, say N.
199 config NF_CONNTRACK_H323
200 tristate "H.323 protocol support"
201 depends on (IPV6 || IPV6=n)
202 depends on NETFILTER_ADVANCED
204 H.323 is a VoIP signalling protocol from ITU-T. As one of the most
205 important VoIP protocols, it is widely used by voice hardware and
206 software including voice gateways, IP phones, Netmeeting, OpenPhone,
209 With this module you can support H.323 on a connection tracking/NAT
212 This module supports RAS, Fast Start, H.245 Tunnelling, Call
213 Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
214 whiteboard, file transfer, etc. For more information, please
215 visit http://nath323.sourceforge.net/.
217 To compile it as a module, choose M here. If unsure, say N.
219 config NF_CONNTRACK_IRC
220 tristate "IRC protocol support"
221 default m if NETFILTER_ADVANCED=n
223 There is a commonly-used extension to IRC called
224 Direct Client-to-Client Protocol (DCC). This enables users to send
225 files to each other, and also chat to each other without the need
226 of a server. DCC Sending is used anywhere you send files over IRC,
227 and DCC Chat is most commonly used by Eggdrop bots. If you are
228 using NAT, this extension will enable you to send files and initiate
229 chats. Note that you do NOT need this extension to get files or
230 have others initiate chats, or everything else in IRC.
232 To compile it as a module, choose M here. If unsure, say N.
234 config NF_CONNTRACK_BROADCAST
237 config NF_CONNTRACK_NETBIOS_NS
238 tristate "NetBIOS name service protocol support"
239 select NF_CONNTRACK_BROADCAST
241 NetBIOS name service requests are sent as broadcast messages from an
242 unprivileged port and responded to with unicast messages to the
243 same port. This make them hard to firewall properly because connection
244 tracking doesn't deal with broadcasts. This helper tracks locally
245 originating NetBIOS name service requests and the corresponding
246 responses. It relies on correct IP address configuration, specifically
247 netmask and broadcast address. When properly configured, the output
248 of "ip address show" should look similar to this:
250 $ ip -4 address show eth0
251 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
252 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
254 To compile it as a module, choose M here. If unsure, say N.
256 config NF_CONNTRACK_SNMP
257 tristate "SNMP service protocol support"
258 depends on NETFILTER_ADVANCED
259 select NF_CONNTRACK_BROADCAST
261 SNMP service requests are sent as broadcast messages from an
262 unprivileged port and responded to with unicast messages to the
263 same port. This make them hard to firewall properly because connection
264 tracking doesn't deal with broadcasts. This helper tracks locally
265 originating SNMP service requests and the corresponding
266 responses. It relies on correct IP address configuration, specifically
267 netmask and broadcast address.
269 To compile it as a module, choose M here. If unsure, say N.
271 config NF_CONNTRACK_PPTP
272 tristate "PPtP protocol support"
273 depends on NETFILTER_ADVANCED
274 select NF_CT_PROTO_GRE
276 This module adds support for PPTP (Point to Point Tunnelling
277 Protocol, RFC2637) connection tracking and NAT.
279 If you are running PPTP sessions over a stateful firewall or NAT
280 box, you may want to enable this feature.
282 Please note that not all PPTP modes of operation are supported yet.
283 Specifically these limitations exist:
284 - Blindly assumes that control connections are always established
285 in PNS->PAC direction. This is a violation of RFC2637.
286 - Only supports a single call within each session
288 To compile it as a module, choose M here. If unsure, say N.
290 config NF_CONNTRACK_SANE
291 tristate "SANE protocol support"
292 depends on NETFILTER_ADVANCED
294 SANE is a protocol for remote access to scanners as implemented
295 by the 'saned' daemon. Like FTP, it uses separate control and
298 With this module you can support SANE on a connection tracking
301 To compile it as a module, choose M here. If unsure, say N.
303 config NF_CONNTRACK_SIP
304 tristate "SIP protocol support"
305 default m if NETFILTER_ADVANCED=n
307 SIP is an application-layer control protocol that can establish,
308 modify, and terminate multimedia sessions (conferences) such as
309 Internet telephony calls. With the ip_conntrack_sip and
310 the nf_nat_sip modules you can support the protocol on a connection
311 tracking/NATing firewall.
313 To compile it as a module, choose M here. If unsure, say N.
315 config NF_CONNTRACK_TFTP
316 tristate "TFTP protocol support"
317 depends on NETFILTER_ADVANCED
319 TFTP connection tracking helper, this is required depending
320 on how restrictive your ruleset is.
321 If you are using a tftp client behind -j SNAT or -j MASQUERADING
324 To compile it as a module, choose M here. If unsure, say N.
327 tristate 'Connection tracking netlink interface'
328 select NETFILTER_NETLINK
329 default m if NETFILTER_ADVANCED=n
331 This option enables support for a netlink-based userspace interface
333 config NF_CT_NETLINK_TIMEOUT
334 tristate 'Connection tracking timeout tuning via Netlink'
335 select NETFILTER_NETLINK
336 depends on NETFILTER_ADVANCED
338 This option enables support for connection tracking timeout
339 fine-grain tuning. This allows you to attach specific timeout
340 policies to flows, instead of using the global timeout policy.
344 config NF_CT_NETLINK_HELPER
345 tristate 'Connection tracking helpers in user-space via Netlink'
346 select NETFILTER_NETLINK
347 depends on NF_CT_NETLINK
348 depends on NETFILTER_NETLINK_QUEUE
349 depends on NETFILTER_NETLINK_QUEUE_CT
350 depends on NETFILTER_ADVANCED
352 This option enables the user-space connection tracking helpers
357 config NETFILTER_NETLINK_QUEUE_CT
358 bool "NFQUEUE integration with Connection Tracking"
360 depends on NETFILTER_NETLINK_QUEUE
362 If this option is enabled, NFQUEUE can include Connection Tracking
363 information together with the packet is the enqueued via NFNETLINK.
373 config NF_NAT_PROTO_DCCP
375 depends on NF_NAT && NF_CT_PROTO_DCCP
376 default NF_NAT && NF_CT_PROTO_DCCP
378 config NF_NAT_PROTO_UDPLITE
380 depends on NF_NAT && NF_CT_PROTO_UDPLITE
381 default NF_NAT && NF_CT_PROTO_UDPLITE
383 config NF_NAT_PROTO_SCTP
385 default NF_NAT && NF_CT_PROTO_SCTP
386 depends on NF_NAT && NF_CT_PROTO_SCTP
391 depends on NF_CONNTRACK && NF_NAT
392 default NF_NAT && NF_CONNTRACK_AMANDA
396 depends on NF_CONNTRACK && NF_NAT
397 default NF_NAT && NF_CONNTRACK_FTP
401 depends on NF_CONNTRACK && NF_NAT
402 default NF_NAT && NF_CONNTRACK_IRC
406 depends on NF_CONNTRACK && NF_NAT
407 default NF_NAT && NF_CONNTRACK_SIP
411 depends on NF_CONNTRACK && NF_NAT
412 default NF_NAT && NF_CONNTRACK_TFTP
414 config NF_NAT_REDIRECT
415 tristate "IPv4/IPv6 redirect support"
418 This is the kernel functionality to redirect packets to local
421 config NETFILTER_SYNPROXY
427 select NETFILTER_NETLINK
428 tristate "Netfilter nf_tables support"
430 nftables is the new packet classification framework that intends to
431 replace the existing {ip,ip6,arp,eb}_tables infrastructure. It
432 provides a pseudo-state machine with an extensible instruction-set
433 (also known as expressions) that the userspace 'nft' utility
434 (http://www.netfilter.org/projects/nftables) uses to build the
435 rule-set. It also comes with the generic set infrastructure that
436 allows you to construct mappings between matchings and actions
437 for performance lookups.
439 To compile it as a module, choose M here.
441 config NF_TABLES_INET
442 depends on NF_TABLES && IPV6
443 select NF_TABLES_IPV4
444 select NF_TABLES_IPV6
445 tristate "Netfilter nf_tables mixed IPv4/IPv6 tables support"
447 This option enables support for a mixed IPv4/IPv6 "inet" table.
451 tristate "Netfilter nf_tables IPv6 exthdr module"
453 This option adds the "exthdr" expression that you can use to match
454 IPv6 extension headers.
458 tristate "Netfilter nf_tables meta module"
460 This option adds the "meta" expression that you can use to match and
461 to set packet metainformation such as the packet mark.
465 depends on NF_CONNTRACK
466 tristate "Netfilter nf_tables conntrack module"
468 This option adds the "meta" expression that you can use to match
469 connection tracking information such as the flow state.
473 tristate "Netfilter nf_tables rbtree set module"
475 This option adds the "rbtree" set type (Red Black tree) that is used
476 to build interval-based sets.
480 tristate "Netfilter nf_tables hash set module"
482 This option adds the "hash" set type that is used to build one-way
483 mappings between matchings and actions.
487 tristate "Netfilter nf_tables counter module"
489 This option adds the "counter" expression that you can use to
490 include packet and byte counters in a rule.
494 tristate "Netfilter nf_tables log module"
496 This option adds the "log" expression that you can use to log
497 packets matching some criteria.
501 tristate "Netfilter nf_tables limit module"
503 This option adds the "limit" expression that you can use to
504 ratelimit rule matchings.
508 depends on NF_CONNTRACK
510 tristate "Netfilter nf_tables masquerade support"
512 This option adds the "masquerade" expression that you can use
513 to perform NAT in the masquerade flavour.
517 depends on NF_CONNTRACK
519 tristate "Netfilter nf_tables redirect support"
521 This options adds the "redirect" expression that you can use
522 to perform NAT in the redirect flavour.
526 depends on NF_CONNTRACK
528 tristate "Netfilter nf_tables nat module"
530 This option adds the "nat" expression that you can use to perform
531 typical Network Address Translation (NAT) packet transformations.
535 depends on NETFILTER_XTABLES
536 depends on NETFILTER_NETLINK_QUEUE
537 tristate "Netfilter nf_tables queue module"
539 This is required if you intend to use the userspace queueing
540 infrastructure (also known as NFQUEUE) from nftables.
544 default m if NETFILTER_ADVANCED=n
545 tristate "Netfilter nf_tables reject support"
547 This option adds the "reject" expression that you can use to
548 explicitly deny and notify via TCP reset/ICMP informational errors
551 config NFT_REJECT_INET
552 depends on NF_TABLES_INET
558 depends on NETFILTER_XTABLES
559 tristate "Netfilter x_tables over nf_tables module"
561 This is required if you intend to use any of existing
562 x_tables match/target extensions over the nf_tables
565 config NETFILTER_XTABLES
566 tristate "Netfilter Xtables support (required for ip_tables)"
567 default m if NETFILTER_ADVANCED=n
569 This is required if you intend to use any of ip_tables,
570 ip6_tables or arp_tables.
574 comment "Xtables combined modules"
576 config NETFILTER_XT_MARK
577 tristate 'nfmark target and match support'
578 default m if NETFILTER_ADVANCED=n
580 This option adds the "MARK" target and "mark" match.
582 Netfilter mark matching allows you to match packets based on the
583 "nfmark" value in the packet.
584 The target allows you to create rules in the "mangle" table which alter
585 the netfilter mark (nfmark) field associated with the packet.
587 Prior to routing, the nfmark can influence the routing method (see
588 "Use netfilter MARK value as routing key") and can also be used by
589 other subsystems to change their behavior.
591 config NETFILTER_XT_CONNMARK
592 tristate 'ctmark target and match support'
593 depends on NF_CONNTRACK
594 depends on NETFILTER_ADVANCED
595 select NF_CONNTRACK_MARK
597 This option adds the "CONNMARK" target and "connmark" match.
599 Netfilter allows you to store a mark value per connection (a.k.a.
600 ctmark), similarly to the packet mark (nfmark). Using this
601 target and match, you can set and match on this mark.
603 config NETFILTER_XT_SET
604 tristate 'set target and match support'
606 depends on NETFILTER_ADVANCED
608 This option adds the "SET" target and "set" match.
610 Using this target and match, you can add/delete and match
611 elements in the sets created by ipset(8).
613 To compile it as a module, choose M here. If unsure, say N.
615 # alphabetically ordered list of targets
617 comment "Xtables targets"
619 config NETFILTER_XT_TARGET_AUDIT
620 tristate "AUDIT target support"
622 depends on NETFILTER_ADVANCED
624 This option adds a 'AUDIT' target, which can be used to create
625 audit records for packets dropped/accepted.
627 To compileit as a module, choose M here. If unsure, say N.
629 config NETFILTER_XT_TARGET_CHECKSUM
630 tristate "CHECKSUM target support"
631 depends on IP_NF_MANGLE || IP6_NF_MANGLE
632 depends on NETFILTER_ADVANCED
634 This option adds a `CHECKSUM' target, which can be used in the iptables mangle
637 You can use this target to compute and fill in the checksum in
638 a packet that lacks a checksum. This is particularly useful,
639 if you need to work around old applications such as dhcp clients,
640 that do not work well with checksum offloads, but don't want to disable
641 checksum offload in your device.
643 To compile it as a module, choose M here. If unsure, say N.
645 config NETFILTER_XT_TARGET_CLASSIFY
646 tristate '"CLASSIFY" target support'
647 depends on NETFILTER_ADVANCED
649 This option adds a `CLASSIFY' target, which enables the user to set
650 the priority of a packet. Some qdiscs can use this value for
651 classification, among these are:
653 atm, cbq, dsmark, pfifo_fast, htb, prio
655 To compile it as a module, choose M here. If unsure, say N.
657 config NETFILTER_XT_TARGET_CONNMARK
658 tristate '"CONNMARK" target support'
659 depends on NF_CONNTRACK
660 depends on NETFILTER_ADVANCED
661 select NETFILTER_XT_CONNMARK
663 This is a backwards-compat option for the user's convenience
664 (e.g. when running oldconfig). It selects
665 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
667 config NETFILTER_XT_TARGET_CONNSECMARK
668 tristate '"CONNSECMARK" target support'
669 depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
670 default m if NETFILTER_ADVANCED=n
672 The CONNSECMARK target copies security markings from packets
673 to connections, and restores security markings from connections
674 to packets (if the packets are not already marked). This would
675 normally be used in conjunction with the SECMARK target.
677 To compile it as a module, choose M here. If unsure, say N.
679 config NETFILTER_XT_TARGET_CT
680 tristate '"CT" target support'
681 depends on NF_CONNTRACK
682 depends on IP_NF_RAW || IP6_NF_RAW
683 depends on NETFILTER_ADVANCED
685 This options adds a `CT' target, which allows to specify initial
686 connection tracking parameters like events to be delivered and
687 the helper to be used.
689 To compile it as a module, choose M here. If unsure, say N.
691 config NETFILTER_XT_TARGET_DSCP
692 tristate '"DSCP" and "TOS" target support'
693 depends on IP_NF_MANGLE || IP6_NF_MANGLE
694 depends on NETFILTER_ADVANCED
696 This option adds a `DSCP' target, which allows you to manipulate
697 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
699 The DSCP field can have any value between 0x0 and 0x3f inclusive.
701 It also adds the "TOS" target, which allows you to create rules in
702 the "mangle" table which alter the Type Of Service field of an IPv4
703 or the Priority field of an IPv6 packet, prior to routing.
705 To compile it as a module, choose M here. If unsure, say N.
707 config NETFILTER_XT_TARGET_HL
708 tristate '"HL" hoplimit target support'
709 depends on IP_NF_MANGLE || IP6_NF_MANGLE
710 depends on NETFILTER_ADVANCED
712 This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
713 targets, which enable the user to change the
714 hoplimit/time-to-live value of the IP header.
716 While it is safe to decrement the hoplimit/TTL value, the
717 modules also allow to increment and set the hoplimit value of
718 the header to arbitrary values. This is EXTREMELY DANGEROUS
719 since you can easily create immortal packets that loop
720 forever on the network.
722 config NETFILTER_XT_TARGET_HMARK
723 tristate '"HMARK" target support'
724 depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
725 depends on NETFILTER_ADVANCED
727 This option adds the "HMARK" target.
729 The target allows you to create rules in the "raw" and "mangle" tables
730 which set the skbuff mark by means of hash calculation within a given
731 range. The nfmark can influence the routing method (see "Use netfilter
732 MARK value as routing key") and can also be used by other subsystems to
733 change their behaviour.
735 To compile it as a module, choose M here. If unsure, say N.
737 config NETFILTER_XT_TARGET_IDLETIMER
738 tristate "IDLETIMER target support"
739 depends on NETFILTER_ADVANCED
742 This option adds the `IDLETIMER' target. Each matching packet
743 resets the timer associated with label specified when the rule is
744 added. When the timer expires, it triggers a sysfs notification.
745 The remaining time for expiration can be read via sysfs.
747 To compile it as a module, choose M here. If unsure, say N.
749 config NETFILTER_XT_TARGET_LED
750 tristate '"LED" target support'
751 depends on LEDS_CLASS && LEDS_TRIGGERS
752 depends on NETFILTER_ADVANCED
754 This option adds a `LED' target, which allows you to blink LEDs in
755 response to particular packets passing through your machine.
757 This can be used to turn a spare LED into a network activity LED,
758 which only flashes in response to FTP transfers, for example. Or
759 you could have an LED which lights up for a minute or two every time
760 somebody connects to your machine via SSH.
762 You will need support for the "led" class to make this work.
764 To create an LED trigger for incoming SSH traffic:
765 iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
767 Then attach the new trigger to an LED on your system:
768 echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
770 For more information on the LEDs available on your system, see
771 Documentation/leds/leds-class.txt
773 config NETFILTER_XT_TARGET_LOG
774 tristate "LOG target support"
777 select NF_LOG_IPV6 if IPV6
778 default m if NETFILTER_ADVANCED=n
780 This option adds a `LOG' target, which allows you to create rules in
781 any iptables table which records the packet header to the syslog.
783 To compile it as a module, choose M here. If unsure, say N.
785 config NETFILTER_XT_TARGET_MARK
786 tristate '"MARK" target support'
787 depends on NETFILTER_ADVANCED
788 select NETFILTER_XT_MARK
790 This is a backwards-compat option for the user's convenience
791 (e.g. when running oldconfig). It selects
792 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
794 config NETFILTER_XT_NAT
795 tristate '"SNAT and DNAT" targets support'
798 This option enables the SNAT and DNAT targets.
800 To compile it as a module, choose M here. If unsure, say N.
802 config NETFILTER_XT_TARGET_NETMAP
803 tristate '"NETMAP" target support'
806 NETMAP is an implementation of static 1:1 NAT mapping of network
807 addresses. It maps the network address part, while keeping the host
810 To compile it as a module, choose M here. If unsure, say N.
812 config NETFILTER_XT_TARGET_NFLOG
813 tristate '"NFLOG" target support'
814 default m if NETFILTER_ADVANCED=n
815 select NETFILTER_NETLINK_LOG
817 This option enables the NFLOG target, which allows to LOG
818 messages through nfnetlink_log.
820 To compile it as a module, choose M here. If unsure, say N.
822 config NETFILTER_XT_TARGET_NFQUEUE
823 tristate '"NFQUEUE" target Support'
824 depends on NETFILTER_ADVANCED
825 select NETFILTER_NETLINK_QUEUE
827 This target replaced the old obsolete QUEUE target.
829 As opposed to QUEUE, it supports 65535 different queues,
832 To compile it as a module, choose M here. If unsure, say N.
834 config NETFILTER_XT_TARGET_NOTRACK
835 tristate '"NOTRACK" target support (DEPRECATED)'
836 depends on NF_CONNTRACK
837 depends on IP_NF_RAW || IP6_NF_RAW
838 depends on NETFILTER_ADVANCED
839 select NETFILTER_XT_TARGET_CT
841 config NETFILTER_XT_TARGET_RATEEST
842 tristate '"RATEEST" target support'
843 depends on NETFILTER_ADVANCED
845 This option adds a `RATEEST' target, which allows to measure
846 rates similar to TC estimators. The `rateest' match can be
847 used to match on the measured rates.
849 To compile it as a module, choose M here. If unsure, say N.
851 config NETFILTER_XT_TARGET_REDIRECT
852 tristate "REDIRECT target support"
854 select NF_NAT_REDIRECT
856 REDIRECT is a special case of NAT: all incoming connections are
857 mapped onto the incoming interface's address, causing the packets to
858 come to the local machine instead of passing through. This is
859 useful for transparent proxies.
861 To compile it as a module, choose M here. If unsure, say N.
863 config NETFILTER_XT_TARGET_TEE
864 tristate '"TEE" - packet cloning to alternate destination'
865 depends on NETFILTER_ADVANCED
866 depends on (IPV6 || IPV6=n)
867 depends on !NF_CONNTRACK || NF_CONNTRACK
869 This option adds a "TEE" target with which a packet can be cloned and
870 this clone be rerouted to another nexthop.
872 config NETFILTER_XT_TARGET_TPROXY
873 tristate '"TPROXY" target transparent proxying support'
874 depends on NETFILTER_XTABLES
875 depends on NETFILTER_ADVANCED
876 depends on (IPV6 || IPV6=n)
877 depends on IP_NF_MANGLE
878 select NF_DEFRAG_IPV4
879 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
881 This option adds a `TPROXY' target, which is somewhat similar to
882 REDIRECT. It can only be used in the mangle table and is useful
883 to redirect traffic to a transparent proxy. It does _not_ depend
884 on Netfilter connection tracking and NAT, unlike REDIRECT.
885 For it to work you will have to configure certain iptables rules
886 and use policy routing. For more information on how to set it up
887 see Documentation/networking/tproxy.txt.
889 To compile it as a module, choose M here. If unsure, say N.
891 config NETFILTER_XT_TARGET_TRACE
892 tristate '"TRACE" target support'
893 depends on IP_NF_RAW || IP6_NF_RAW
894 depends on NETFILTER_ADVANCED
896 The TRACE target allows you to mark packets so that the kernel
897 will log every rule which match the packets as those traverse
898 the tables, chains, rules.
900 If you want to compile it as a module, say M here and read
901 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
903 config NETFILTER_XT_TARGET_SECMARK
904 tristate '"SECMARK" target support'
905 depends on NETWORK_SECMARK
906 default m if NETFILTER_ADVANCED=n
908 The SECMARK target allows security marking of network
909 packets, for use with security subsystems.
911 To compile it as a module, choose M here. If unsure, say N.
913 config NETFILTER_XT_TARGET_TCPMSS
914 tristate '"TCPMSS" target support'
915 depends on (IPV6 || IPV6=n)
916 default m if NETFILTER_ADVANCED=n
918 This option adds a `TCPMSS' target, which allows you to alter the
919 MSS value of TCP SYN packets, to control the maximum size for that
920 connection (usually limiting it to your outgoing interface's MTU
923 This is used to overcome criminally braindead ISPs or servers which
924 block ICMP Fragmentation Needed packets. The symptoms of this
925 problem are that everything works fine from your Linux
926 firewall/router, but machines behind it can never exchange large
928 1) Web browsers connect, then hang with no data received.
929 2) Small mail works fine, but large emails hang.
930 3) ssh works fine, but scp hangs after initial handshaking.
932 Workaround: activate this option and add a rule to your firewall
935 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
936 -j TCPMSS --clamp-mss-to-pmtu
938 To compile it as a module, choose M here. If unsure, say N.
940 config NETFILTER_XT_TARGET_TCPOPTSTRIP
941 tristate '"TCPOPTSTRIP" target support'
942 depends on IP_NF_MANGLE || IP6_NF_MANGLE
943 depends on NETFILTER_ADVANCED
945 This option adds a "TCPOPTSTRIP" target, which allows you to strip
946 TCP options from TCP packets.
948 # alphabetically ordered list of matches
950 comment "Xtables matches"
952 config NETFILTER_XT_MATCH_ADDRTYPE
953 tristate '"addrtype" address type match support'
954 depends on NETFILTER_ADVANCED
956 This option allows you to match what routing thinks of an address,
957 eg. UNICAST, LOCAL, BROADCAST, ...
959 If you want to compile it as a module, say M here and read
960 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
962 config NETFILTER_XT_MATCH_BPF
963 tristate '"bpf" match support'
964 depends on NETFILTER_ADVANCED
966 BPF matching applies a linux socket filter to each packet and
967 accepts those for which the filter returns non-zero.
969 To compile it as a module, choose M here. If unsure, say N.
971 config NETFILTER_XT_MATCH_CGROUP
972 tristate '"control group" match support'
973 depends on NETFILTER_ADVANCED
975 select CGROUP_NET_CLASSID
977 Socket/process control group matching allows you to match locally
978 generated packets based on which net_cls control group processes
981 config NETFILTER_XT_MATCH_CLUSTER
982 tristate '"cluster" match support'
983 depends on NF_CONNTRACK
984 depends on NETFILTER_ADVANCED
986 This option allows you to build work-load-sharing clusters of
987 network servers/stateful firewalls without having a dedicated
988 load-balancing router/server/switch. Basically, this match returns
989 true when the packet must be handled by this cluster node. Thus,
990 all nodes see all packets and this match decides which node handles
991 what packets. The work-load sharing algorithm is based on source
994 If you say Y or M here, try `iptables -m cluster --help` for
997 config NETFILTER_XT_MATCH_COMMENT
998 tristate '"comment" match support'
999 depends on NETFILTER_ADVANCED
1001 This option adds a `comment' dummy-match, which allows you to put
1002 comments in your iptables ruleset.
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_CONNBYTES
1008 tristate '"connbytes" per-connection counter match support'
1009 depends on NF_CONNTRACK
1010 depends on NETFILTER_ADVANCED
1012 This option adds a `connbytes' match, which allows you to match the
1013 number of bytes and/or packets for each direction within a connection.
1015 If you want to compile it as a module, say M here and read
1016 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1018 config NETFILTER_XT_MATCH_CONNLABEL
1019 tristate '"connlabel" match support'
1020 select NF_CONNTRACK_LABELS
1021 depends on NF_CONNTRACK
1022 depends on NETFILTER_ADVANCED
1024 This match allows you to test and assign userspace-defined labels names
1025 to a connection. The kernel only stores bit values - mapping
1026 names to bits is done by userspace.
1028 Unlike connmark, more than 32 flag bits may be assigned to a
1029 connection simultaneously.
1031 config NETFILTER_XT_MATCH_CONNLIMIT
1032 tristate '"connlimit" match support'
1033 depends on NF_CONNTRACK
1034 depends on NETFILTER_ADVANCED
1036 This match allows you to match against the number of parallel
1037 connections to a server per client IP address (or address block).
1039 config NETFILTER_XT_MATCH_CONNMARK
1040 tristate '"connmark" connection mark match support'
1041 depends on NF_CONNTRACK
1042 depends on NETFILTER_ADVANCED
1043 select NETFILTER_XT_CONNMARK
1045 This is a backwards-compat option for the user's convenience
1046 (e.g. when running oldconfig). It selects
1047 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
1049 config NETFILTER_XT_MATCH_CONNTRACK
1050 tristate '"conntrack" connection tracking match support'
1051 depends on NF_CONNTRACK
1052 default m if NETFILTER_ADVANCED=n
1054 This is a general conntrack match module, a superset of the state match.
1056 It allows matching on additional conntrack information, which is
1057 useful in complex configurations, such as NAT gateways with multiple
1058 internet links or tunnels.
1060 To compile it as a module, choose M here. If unsure, say N.
1062 config NETFILTER_XT_MATCH_CPU
1063 tristate '"cpu" match support'
1064 depends on NETFILTER_ADVANCED
1066 CPU matching allows you to match packets based on the CPU
1067 currently handling the packet.
1069 To compile it as a module, choose M here. If unsure, say N.
1071 config NETFILTER_XT_MATCH_DCCP
1072 tristate '"dccp" protocol match support'
1073 depends on NETFILTER_ADVANCED
1076 With this option enabled, you will be able to use the iptables
1077 `dccp' match in order to match on DCCP source/destination ports
1080 If you want to compile it as a module, say M here and read
1081 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1083 config NETFILTER_XT_MATCH_DEVGROUP
1084 tristate '"devgroup" match support'
1085 depends on NETFILTER_ADVANCED
1087 This options adds a `devgroup' match, which allows to match on the
1088 device group a network device is assigned to.
1090 To compile it as a module, choose M here. If unsure, say N.
1092 config NETFILTER_XT_MATCH_DSCP
1093 tristate '"dscp" and "tos" match support'
1094 depends on NETFILTER_ADVANCED
1096 This option adds a `DSCP' match, which allows you to match against
1097 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
1099 The DSCP field can have any value between 0x0 and 0x3f inclusive.
1101 It will also add a "tos" match, which allows you to match packets
1102 based on the Type Of Service fields of the IPv4 packet (which share
1103 the same bits as DSCP).
1105 To compile it as a module, choose M here. If unsure, say N.
1107 config NETFILTER_XT_MATCH_ECN
1108 tristate '"ecn" match support'
1109 depends on NETFILTER_ADVANCED
1111 This option adds an "ECN" match, which allows you to match against
1112 the IPv4 and TCP header ECN fields.
1114 To compile it as a module, choose M here. If unsure, say N.
1116 config NETFILTER_XT_MATCH_ESP
1117 tristate '"esp" match support'
1118 depends on NETFILTER_ADVANCED
1120 This match extension allows you to match a range of SPIs
1121 inside ESP header of IPSec packets.
1123 To compile it as a module, choose M here. If unsure, say N.
1125 config NETFILTER_XT_MATCH_HASHLIMIT
1126 tristate '"hashlimit" match support'
1127 depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
1128 depends on NETFILTER_ADVANCED
1130 This option adds a `hashlimit' match.
1132 As opposed to `limit', this match dynamically creates a hash table
1133 of limit buckets, based on your selection of source/destination
1134 addresses and/or ports.
1136 It enables you to express policies like `10kpps for any given
1137 destination address' or `500pps from any given source address'
1140 config NETFILTER_XT_MATCH_HELPER
1141 tristate '"helper" match support'
1142 depends on NF_CONNTRACK
1143 depends on NETFILTER_ADVANCED
1145 Helper matching allows you to match packets in dynamic connections
1146 tracked by a conntrack-helper, ie. ip_conntrack_ftp
1148 To compile it as a module, choose M here. If unsure, say Y.
1150 config NETFILTER_XT_MATCH_HL
1151 tristate '"hl" hoplimit/TTL match support'
1152 depends on NETFILTER_ADVANCED
1154 HL matching allows you to match packets based on the hoplimit
1155 in the IPv6 header, or the time-to-live field in the IPv4
1156 header of the packet.
1158 config NETFILTER_XT_MATCH_IPCOMP
1159 tristate '"ipcomp" match support'
1160 depends on NETFILTER_ADVANCED
1162 This match extension allows you to match a range of CPIs(16 bits)
1163 inside IPComp header of IPSec packets.
1165 To compile it as a module, choose M here. If unsure, say N.
1167 config NETFILTER_XT_MATCH_IPRANGE
1168 tristate '"iprange" address range match support'
1169 depends on NETFILTER_ADVANCED
1171 This option adds a "iprange" match, which allows you to match based on
1172 an IP address range. (Normal iptables only matches on single addresses
1173 with an optional mask.)
1177 config NETFILTER_XT_MATCH_IPVS
1178 tristate '"ipvs" match support'
1180 depends on NETFILTER_ADVANCED
1181 depends on NF_CONNTRACK
1183 This option allows you to match against IPVS properties of a packet.
1187 config NETFILTER_XT_MATCH_L2TP
1188 tristate '"l2tp" match support'
1189 depends on NETFILTER_ADVANCED
1192 This option adds an "L2TP" match, which allows you to match against
1193 L2TP protocol header fields.
1195 To compile it as a module, choose M here. If unsure, say N.
1197 config NETFILTER_XT_MATCH_LENGTH
1198 tristate '"length" match support'
1199 depends on NETFILTER_ADVANCED
1201 This option allows you to match the length of a packet against a
1202 specific value or range of values.
1204 To compile it as a module, choose M here. If unsure, say N.
1206 config NETFILTER_XT_MATCH_LIMIT
1207 tristate '"limit" match support'
1208 depends on NETFILTER_ADVANCED
1210 limit matching allows you to control the rate at which a rule can be
1211 matched: mainly useful in combination with the LOG target ("LOG
1212 target support", below) and to avoid some Denial of Service attacks.
1214 To compile it as a module, choose M here. If unsure, say N.
1216 config NETFILTER_XT_MATCH_MAC
1217 tristate '"mac" address match support'
1218 depends on NETFILTER_ADVANCED
1220 MAC matching allows you to match packets based on the source
1221 Ethernet address of the packet.
1223 To compile it as a module, choose M here. If unsure, say N.
1225 config NETFILTER_XT_MATCH_MARK
1226 tristate '"mark" match support'
1227 depends on NETFILTER_ADVANCED
1228 select NETFILTER_XT_MARK
1230 This is a backwards-compat option for the user's convenience
1231 (e.g. when running oldconfig). It selects
1232 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
1234 config NETFILTER_XT_MATCH_MULTIPORT
1235 tristate '"multiport" Multiple port match support'
1236 depends on NETFILTER_ADVANCED
1238 Multiport matching allows you to match TCP or UDP packets based on
1239 a series of source or destination ports: normally a rule can only
1240 match a single range of ports.
1242 To compile it as a module, choose M here. If unsure, say N.
1244 config NETFILTER_XT_MATCH_NFACCT
1245 tristate '"nfacct" match support'
1246 depends on NETFILTER_ADVANCED
1247 select NETFILTER_NETLINK_ACCT
1249 This option allows you to use the extended accounting through
1252 To compile it as a module, choose M here. If unsure, say N.
1254 config NETFILTER_XT_MATCH_OSF
1255 tristate '"osf" Passive OS fingerprint match'
1256 depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
1258 This option selects the Passive OS Fingerprinting match module
1259 that allows to passively match the remote operating system by
1260 analyzing incoming TCP SYN packets.
1262 Rules and loading software can be downloaded from
1263 http://www.ioremap.net/projects/osf
1265 To compile it as a module, choose M here. If unsure, say N.
1267 config NETFILTER_XT_MATCH_OWNER
1268 tristate '"owner" match support'
1269 depends on NETFILTER_ADVANCED
1271 Socket owner matching allows you to match locally-generated packets
1272 based on who created the socket: the user or group. It is also
1273 possible to check whether a socket actually exists.
1275 config NETFILTER_XT_MATCH_POLICY
1276 tristate 'IPsec "policy" match support'
1278 default m if NETFILTER_ADVANCED=n
1280 Policy matching allows you to match packets based on the
1281 IPsec policy that was used during decapsulation/will
1282 be used during encapsulation.
1284 To compile it as a module, choose M here. If unsure, say N.
1286 config NETFILTER_XT_MATCH_PHYSDEV
1287 tristate '"physdev" match support'
1288 depends on BRIDGE && BRIDGE_NETFILTER
1289 depends on NETFILTER_ADVANCED
1291 Physdev packet matching matches against the physical bridge ports
1292 the IP packet arrived on or will leave by.
1294 To compile it as a module, choose M here. If unsure, say N.
1296 config NETFILTER_XT_MATCH_PKTTYPE
1297 tristate '"pkttype" packet type match support'
1298 depends on NETFILTER_ADVANCED
1300 Packet type matching allows you to match a packet by
1301 its "class", eg. BROADCAST, MULTICAST, ...
1304 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
1306 To compile it as a module, choose M here. If unsure, say N.
1308 config NETFILTER_XT_MATCH_QUOTA
1309 tristate '"quota" match support'
1310 depends on NETFILTER_ADVANCED
1312 This option adds a `quota' match, which allows to match on a
1315 If you want to compile it as a module, say M here and read
1316 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1318 config NETFILTER_XT_MATCH_RATEEST
1319 tristate '"rateest" match support'
1320 depends on NETFILTER_ADVANCED
1321 select NETFILTER_XT_TARGET_RATEEST
1323 This option adds a `rateest' match, which allows to match on the
1324 rate estimated by the RATEEST target.
1326 To compile it as a module, choose M here. If unsure, say N.
1328 config NETFILTER_XT_MATCH_REALM
1329 tristate '"realm" match support'
1330 depends on NETFILTER_ADVANCED
1331 select IP_ROUTE_CLASSID
1333 This option adds a `realm' match, which allows you to use the realm
1334 key from the routing subsystem inside iptables.
1336 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
1339 If you want to compile it as a module, say M here and read
1340 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1342 config NETFILTER_XT_MATCH_RECENT
1343 tristate '"recent" match support'
1344 depends on NETFILTER_ADVANCED
1346 This match is used for creating one or many lists of recently
1347 used addresses and then matching against that/those list(s).
1349 Short options are available by using 'iptables -m recent -h'
1350 Official Website: <http://snowman.net/projects/ipt_recent/>
1352 config NETFILTER_XT_MATCH_SCTP
1353 tristate '"sctp" protocol match support'
1354 depends on NETFILTER_ADVANCED
1357 With this option enabled, you will be able to use the
1358 `sctp' match in order to match on SCTP source/destination ports
1359 and SCTP chunk types.
1361 If you want to compile it as a module, say M here and read
1362 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1364 config NETFILTER_XT_MATCH_SOCKET
1365 tristate '"socket" match support'
1366 depends on NETFILTER_XTABLES
1367 depends on NETFILTER_ADVANCED
1368 depends on !NF_CONNTRACK || NF_CONNTRACK
1369 depends on (IPV6 || IPV6=n)
1370 select NF_DEFRAG_IPV4
1371 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
1373 This option adds a `socket' match, which can be used to match
1374 packets for which a TCP or UDP socket lookup finds a valid socket.
1375 It can be used in combination with the MARK target and policy
1376 routing to implement full featured non-locally bound sockets.
1378 To compile it as a module, choose M here. If unsure, say N.
1380 config NETFILTER_XT_MATCH_STATE
1381 tristate '"state" match support'
1382 depends on NF_CONNTRACK
1383 default m if NETFILTER_ADVANCED=n
1385 Connection state matching allows you to match packets based on their
1386 relationship to a tracked connection (ie. previous packets). This
1387 is a powerful tool for packet classification.
1389 To compile it as a module, choose M here. If unsure, say N.
1391 config NETFILTER_XT_MATCH_STATISTIC
1392 tristate '"statistic" match support'
1393 depends on NETFILTER_ADVANCED
1395 This option adds a `statistic' match, which allows you to match
1396 on packets periodically or randomly with a given percentage.
1398 To compile it as a module, choose M here. If unsure, say N.
1400 config NETFILTER_XT_MATCH_STRING
1401 tristate '"string" match support'
1402 depends on NETFILTER_ADVANCED
1404 select TEXTSEARCH_KMP
1405 select TEXTSEARCH_BM
1406 select TEXTSEARCH_FSM
1408 This option adds a `string' match, which allows you to look for
1409 pattern matchings in packets.
1411 To compile it as a module, choose M here. If unsure, say N.
1413 config NETFILTER_XT_MATCH_TCPMSS
1414 tristate '"tcpmss" match support'
1415 depends on NETFILTER_ADVANCED
1417 This option adds a `tcpmss' match, which allows you to examine the
1418 MSS value of TCP SYN packets, which control the maximum packet size
1419 for that connection.
1421 To compile it as a module, choose M here. If unsure, say N.
1423 config NETFILTER_XT_MATCH_TIME
1424 tristate '"time" match support'
1425 depends on NETFILTER_ADVANCED
1427 This option adds a "time" match, which allows you to match based on
1428 the packet arrival time (at the machine which netfilter is running)
1429 on) or departure time/date (for locally generated packets).
1431 If you say Y here, try `iptables -m time --help` for
1434 If you want to compile it as a module, say M here.
1437 config NETFILTER_XT_MATCH_U32
1438 tristate '"u32" match support'
1439 depends on NETFILTER_ADVANCED
1441 u32 allows you to extract quantities of up to 4 bytes from a packet,
1442 AND them with specified masks, shift them by specified amounts and
1443 test whether the results are in any of a set of specified ranges.
1444 The specification of what to extract is general enough to skip over
1445 headers with lengths stored in the packet, as in IP or TCP header
1448 Details and examples are in the kernel module source.
1450 endif # NETFILTER_XTABLES
1454 source "net/netfilter/ipset/Kconfig"
1456 source "net/netfilter/ipvs/Kconfig"