1 menu "Core Netfilter Configuration"
2 depends on NET && INET && NETFILTER
4 config NETFILTER_INGRESS
5 bool "Netfilter ingress support"
9 This allows you to classify packets from ingress using the Netfilter
12 config NETFILTER_NETLINK
15 config NETFILTER_NETLINK_ACCT
16 tristate "Netfilter NFACCT 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 extended accounting via NFNETLINK.
23 config NETFILTER_NETLINK_QUEUE
24 tristate "Netfilter NFQUEUE over NFNETLINK interface"
25 depends on NETFILTER_ADVANCED
26 select NETFILTER_NETLINK
28 If this option is enabled, the kernel will include support
29 for queueing packets via NFNETLINK.
31 config NETFILTER_NETLINK_LOG
32 tristate "Netfilter LOG over NFNETLINK interface"
33 default m if NETFILTER_ADVANCED=n
34 select NETFILTER_NETLINK
36 If this option is enabled, the kernel will include support
37 for logging packets via NFNETLINK.
39 This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
40 and is also scheduled to replace the old syslog-based ipt_LOG
44 tristate "Netfilter connection tracking support"
45 default m if NETFILTER_ADVANCED=n
47 Connection tracking keeps a record of what packets have passed
48 through your machine, in order to figure out how they are related
51 This is required to do Masquerading or other kinds of Network
52 Address Translation. It can also be used to enhance packet
53 filtering (see `Connection state match support' below).
55 To compile it as a module, choose M here. If unsure, say N.
62 config NF_CONNTRACK_MARK
63 bool 'Connection mark tracking support'
64 depends on NETFILTER_ADVANCED
66 This option enables support for connection marks, used by the
67 `CONNMARK' target and `connmark' match. Similar to the mark value
68 of packets, but this mark value is kept in the conntrack session
69 instead of the individual packets.
71 config NF_CONNTRACK_SECMARK
72 bool 'Connection tracking security mark support'
73 depends on NETWORK_SECMARK
74 default m if NETFILTER_ADVANCED=n
76 This option enables security markings to be applied to
77 connections. Typically they are copied to connections from
78 packets using the CONNSECMARK target and copied back from
79 connections to packets with the same target, with the packets
80 being originally labeled via SECMARK.
84 config NF_CONNTRACK_ZONES
85 bool 'Connection tracking zones'
86 depends on NETFILTER_ADVANCED
87 depends on NETFILTER_XT_TARGET_CT
89 This option enables support for connection tracking zones.
90 Normally, each connection needs to have a unique system wide
91 identity. Connection tracking zones allow to have multiple
92 connections using the same identity, as long as they are
93 contained in different zones.
97 config NF_CONNTRACK_PROCFS
98 bool "Supply CT list in procfs (OBSOLETE)"
102 This option enables for the list of known conntrack entries
103 to be shown in procfs under net/netfilter/nf_conntrack. This
104 is considered obsolete in favor of using the conntrack(8)
105 tool which uses Netlink.
107 config NF_CONNTRACK_EVENTS
108 bool "Connection tracking events"
109 depends on NETFILTER_ADVANCED
111 If this option is enabled, the connection tracking code will
112 provide a notifier chain that can be used by other kernel code
113 to get notified about changes in the connection tracking state.
117 config NF_CONNTRACK_TIMEOUT
118 bool 'Connection tracking timeout'
119 depends on NETFILTER_ADVANCED
121 This option enables support for connection tracking timeout
122 extension. This allows you to attach timeout policies to flow
127 config NF_CONNTRACK_TIMESTAMP
128 bool 'Connection tracking timestamping'
129 depends on NETFILTER_ADVANCED
131 This option enables support for connection tracking timestamping.
132 This allows you to store the flow start-time and to obtain
133 the flow-stop time (once it has been destroyed) via Connection
138 config NF_CONNTRACK_LABELS
141 This option enables support for assigning user-defined flag bits
142 to connection tracking entries. It selected by the connlabel match.
144 config NF_CT_PROTO_DCCP
145 tristate 'DCCP protocol connection tracking support'
146 depends on NETFILTER_ADVANCED
149 With this option enabled, the layer 3 independent connection
150 tracking code will be able to do state tracking on DCCP connections.
154 config NF_CT_PROTO_GRE
157 config NF_CT_PROTO_SCTP
158 tristate 'SCTP protocol connection tracking support'
159 depends on NETFILTER_ADVANCED
162 With this option enabled, the layer 3 independent connection
163 tracking code will be able to do state tracking on SCTP connections.
165 If you want to compile it as a module, say M here and read
166 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
168 config NF_CT_PROTO_UDPLITE
169 tristate 'UDP-Lite protocol connection tracking support'
170 depends on NETFILTER_ADVANCED
172 With this option enabled, the layer 3 independent connection
173 tracking code will be able to do state tracking on UDP-Lite
176 To compile it as a module, choose M here. If unsure, say N.
178 config NF_CONNTRACK_AMANDA
179 tristate "Amanda backup protocol support"
180 depends on NETFILTER_ADVANCED
182 select TEXTSEARCH_KMP
184 If you are running the Amanda backup package <http://www.amanda.org/>
185 on this machine or machines that will be MASQUERADED through this
186 machine, then you may want to enable this feature. This allows the
187 connection tracking and natting code to allow the sub-channels that
188 Amanda requires for communication of the backup data, messages and
191 To compile it as a module, choose M here. If unsure, say N.
193 config NF_CONNTRACK_FTP
194 tristate "FTP protocol support"
195 default m if NETFILTER_ADVANCED=n
197 Tracking FTP connections is problematic: special helpers are
198 required for tracking them, and doing masquerading and other forms
199 of Network Address Translation on them.
201 This is FTP support on Layer 3 independent connection tracking.
202 Layer 3 independent connection tracking is experimental scheme
203 which generalize ip_conntrack to support other layer 3 protocols.
205 To compile it as a module, choose M here. If unsure, say N.
207 config NF_CONNTRACK_H323
208 tristate "H.323 protocol support"
209 depends on IPV6 || IPV6=n
210 depends on NETFILTER_ADVANCED
212 H.323 is a VoIP signalling protocol from ITU-T. As one of the most
213 important VoIP protocols, it is widely used by voice hardware and
214 software including voice gateways, IP phones, Netmeeting, OpenPhone,
217 With this module you can support H.323 on a connection tracking/NAT
220 This module supports RAS, Fast Start, H.245 Tunnelling, Call
221 Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
222 whiteboard, file transfer, etc. For more information, please
223 visit http://nath323.sourceforge.net/.
225 To compile it as a module, choose M here. If unsure, say N.
227 config NF_CONNTRACK_IRC
228 tristate "IRC protocol support"
229 default m if NETFILTER_ADVANCED=n
231 There is a commonly-used extension to IRC called
232 Direct Client-to-Client Protocol (DCC). This enables users to send
233 files to each other, and also chat to each other without the need
234 of a server. DCC Sending is used anywhere you send files over IRC,
235 and DCC Chat is most commonly used by Eggdrop bots. If you are
236 using NAT, this extension will enable you to send files and initiate
237 chats. Note that you do NOT need this extension to get files or
238 have others initiate chats, or everything else in IRC.
240 To compile it as a module, choose M here. If unsure, say N.
242 config NF_CONNTRACK_BROADCAST
245 config NF_CONNTRACK_NETBIOS_NS
246 tristate "NetBIOS name service protocol support"
247 select NF_CONNTRACK_BROADCAST
249 NetBIOS name service requests are sent as broadcast messages from an
250 unprivileged port and responded to with unicast messages to the
251 same port. This make them hard to firewall properly because connection
252 tracking doesn't deal with broadcasts. This helper tracks locally
253 originating NetBIOS name service requests and the corresponding
254 responses. It relies on correct IP address configuration, specifically
255 netmask and broadcast address. When properly configured, the output
256 of "ip address show" should look similar to this:
258 $ ip -4 address show eth0
259 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
260 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
262 To compile it as a module, choose M here. If unsure, say N.
264 config NF_CONNTRACK_SNMP
265 tristate "SNMP service protocol support"
266 depends on NETFILTER_ADVANCED
267 select NF_CONNTRACK_BROADCAST
269 SNMP service requests are sent as broadcast messages from an
270 unprivileged port and responded to with unicast messages to the
271 same port. This make them hard to firewall properly because connection
272 tracking doesn't deal with broadcasts. This helper tracks locally
273 originating SNMP service requests and the corresponding
274 responses. It relies on correct IP address configuration, specifically
275 netmask and broadcast address.
277 To compile it as a module, choose M here. If unsure, say N.
279 config NF_CONNTRACK_PPTP
280 tristate "PPtP protocol support"
281 depends on NETFILTER_ADVANCED
282 select NF_CT_PROTO_GRE
284 This module adds support for PPTP (Point to Point Tunnelling
285 Protocol, RFC2637) connection tracking and NAT.
287 If you are running PPTP sessions over a stateful firewall or NAT
288 box, you may want to enable this feature.
290 Please note that not all PPTP modes of operation are supported yet.
291 Specifically these limitations exist:
292 - Blindly assumes that control connections are always established
293 in PNS->PAC direction. This is a violation of RFC2637.
294 - Only supports a single call within each session
296 To compile it as a module, choose M here. If unsure, say N.
298 config NF_CONNTRACK_SANE
299 tristate "SANE protocol support"
300 depends on NETFILTER_ADVANCED
302 SANE is a protocol for remote access to scanners as implemented
303 by the 'saned' daemon. Like FTP, it uses separate control and
306 With this module you can support SANE on a connection tracking
309 To compile it as a module, choose M here. If unsure, say N.
311 config NF_CONNTRACK_SIP
312 tristate "SIP protocol support"
313 default m if NETFILTER_ADVANCED=n
315 SIP is an application-layer control protocol that can establish,
316 modify, and terminate multimedia sessions (conferences) such as
317 Internet telephony calls. With the ip_conntrack_sip and
318 the nf_nat_sip modules you can support the protocol on a connection
319 tracking/NATing firewall.
321 To compile it as a module, choose M here. If unsure, say N.
323 config NF_CONNTRACK_TFTP
324 tristate "TFTP protocol support"
325 depends on NETFILTER_ADVANCED
327 TFTP connection tracking helper, this is required depending
328 on how restrictive your ruleset is.
329 If you are using a tftp client behind -j SNAT or -j MASQUERADING
332 To compile it as a module, choose M here. If unsure, say N.
335 tristate 'Connection tracking netlink interface'
336 select NETFILTER_NETLINK
337 default m if NETFILTER_ADVANCED=n
339 This option enables support for a netlink-based userspace interface
341 config NF_CT_NETLINK_TIMEOUT
342 tristate 'Connection tracking timeout tuning via Netlink'
343 select NETFILTER_NETLINK
344 depends on NETFILTER_ADVANCED
346 This option enables support for connection tracking timeout
347 fine-grain tuning. This allows you to attach specific timeout
348 policies to flows, instead of using the global timeout policy.
352 config NF_CT_NETLINK_HELPER
353 tristate 'Connection tracking helpers in user-space via Netlink'
354 select NETFILTER_NETLINK
355 depends on NF_CT_NETLINK
356 depends on NETFILTER_NETLINK_QUEUE
357 depends on NETFILTER_NETLINK_GLUE_CT
358 depends on NETFILTER_ADVANCED
360 This option enables the user-space connection tracking helpers
365 config NETFILTER_NETLINK_GLUE_CT
366 bool "NFQUEUE and NFLOG integration with Connection Tracking"
368 depends on (NETFILTER_NETLINK_QUEUE || NETFILTER_NETLINK_LOG) && NF_CT_NETLINK
370 If this option is enabled, NFQUEUE and NFLOG can include
371 Connection Tracking information together with the packet is
372 the enqueued via NFNETLINK.
382 config NF_NAT_PROTO_DCCP
384 depends on NF_NAT && NF_CT_PROTO_DCCP
385 default NF_NAT && NF_CT_PROTO_DCCP
387 config NF_NAT_PROTO_UDPLITE
389 depends on NF_NAT && NF_CT_PROTO_UDPLITE
390 default NF_NAT && NF_CT_PROTO_UDPLITE
392 config NF_NAT_PROTO_SCTP
394 default NF_NAT && NF_CT_PROTO_SCTP
395 depends on NF_NAT && NF_CT_PROTO_SCTP
400 depends on NF_CONNTRACK && NF_NAT
401 default NF_NAT && NF_CONNTRACK_AMANDA
405 depends on NF_CONNTRACK && NF_NAT
406 default NF_NAT && NF_CONNTRACK_FTP
410 depends on NF_CONNTRACK && NF_NAT
411 default NF_NAT && NF_CONNTRACK_IRC
415 depends on NF_CONNTRACK && NF_NAT
416 default NF_NAT && NF_CONNTRACK_SIP
420 depends on NF_CONNTRACK && NF_NAT
421 default NF_NAT && NF_CONNTRACK_TFTP
423 config NF_NAT_REDIRECT
424 tristate "IPv4/IPv6 redirect support"
427 This is the kernel functionality to redirect packets to local
430 config NETFILTER_SYNPROXY
436 select NETFILTER_NETLINK
437 tristate "Netfilter nf_tables support"
439 nftables is the new packet classification framework that intends to
440 replace the existing {ip,ip6,arp,eb}_tables infrastructure. It
441 provides a pseudo-state machine with an extensible instruction-set
442 (also known as expressions) that the userspace 'nft' utility
443 (http://www.netfilter.org/projects/nftables) uses to build the
444 rule-set. It also comes with the generic set infrastructure that
445 allows you to construct mappings between matchings and actions
446 for performance lookups.
448 To compile it as a module, choose M here.
452 config NF_TABLES_INET
454 select NF_TABLES_IPV4
455 select NF_TABLES_IPV6
456 tristate "Netfilter nf_tables mixed IPv4/IPv6 tables support"
458 This option enables support for a mixed IPv4/IPv6 "inet" table.
460 config NF_TABLES_NETDEV
461 tristate "Netfilter nf_tables netdev tables support"
463 This option enables support for the "netdev" table.
466 tristate "Netfilter nf_tables IPv6 exthdr module"
468 This option adds the "exthdr" expression that you can use to match
469 IPv6 extension headers.
472 tristate "Netfilter nf_tables meta module"
474 This option adds the "meta" expression that you can use to match and
475 to set packet metainformation such as the packet mark.
478 depends on NF_CONNTRACK
479 tristate "Netfilter nf_tables conntrack module"
481 This option adds the "meta" expression that you can use to match
482 connection tracking information such as the flow state.
485 tristate "Netfilter nf_tables rbtree set module"
487 This option adds the "rbtree" set type (Red Black tree) that is used
488 to build interval-based sets.
491 tristate "Netfilter nf_tables hash set module"
493 This option adds the "hash" set type that is used to build one-way
494 mappings between matchings and actions.
497 tristate "Netfilter nf_tables counter module"
499 This option adds the "counter" expression that you can use to
500 include packet and byte counters in a rule.
503 tristate "Netfilter nf_tables log module"
505 This option adds the "log" expression that you can use to log
506 packets matching some criteria.
509 tristate "Netfilter nf_tables limit module"
511 This option adds the "limit" expression that you can use to
512 ratelimit rule matchings.
515 depends on NF_CONNTRACK
517 tristate "Netfilter nf_tables masquerade support"
519 This option adds the "masquerade" expression that you can use
520 to perform NAT in the masquerade flavour.
523 depends on NF_CONNTRACK
525 tristate "Netfilter nf_tables redirect support"
527 This options adds the "redirect" expression that you can use
528 to perform NAT in the redirect flavour.
531 depends on NF_CONNTRACK
533 tristate "Netfilter nf_tables nat module"
535 This option adds the "nat" expression that you can use to perform
536 typical Network Address Translation (NAT) packet transformations.
539 depends on NETFILTER_NETLINK_QUEUE
540 tristate "Netfilter nf_tables queue module"
542 This is required if you intend to use the userspace queueing
543 infrastructure (also known as NFQUEUE) from nftables.
546 default m if NETFILTER_ADVANCED=n
547 tristate "Netfilter nf_tables reject support"
549 This option adds the "reject" expression that you can use to
550 explicitly deny and notify via TCP reset/ICMP informational errors
553 config NFT_REJECT_INET
554 depends on NF_TABLES_INET
559 depends on NETFILTER_XTABLES
560 tristate "Netfilter x_tables over nf_tables module"
562 This is required if you intend to use any of existing
563 x_tables match/target extensions over the nf_tables
569 tristate "Netfilter packet duplication support"
571 This option enables the generic packet duplication infrastructure
574 config NFT_DUP_NETDEV
575 tristate "Netfilter nf_tables netdev packet duplication support"
578 This option enables packet duplication for the "netdev" family.
580 config NFT_FWD_NETDEV
581 tristate "Netfilter nf_tables netdev packet forwarding support"
584 This option enables packet forwarding for the "netdev" family.
586 endif # NF_TABLES_NETDEV
590 config NETFILTER_XTABLES
591 tristate "Netfilter Xtables support (required for ip_tables)"
592 default m if NETFILTER_ADVANCED=n
594 This is required if you intend to use any of ip_tables,
595 ip6_tables or arp_tables.
599 comment "Xtables combined modules"
601 config NETFILTER_XT_MARK
602 tristate 'nfmark target and match support'
603 default m if NETFILTER_ADVANCED=n
605 This option adds the "MARK" target and "mark" match.
607 Netfilter mark matching allows you to match packets based on the
608 "nfmark" value in the packet.
609 The target allows you to create rules in the "mangle" table which alter
610 the netfilter mark (nfmark) field associated with the packet.
612 Prior to routing, the nfmark can influence the routing method and can
613 also be used by other subsystems to change their behavior.
615 config NETFILTER_XT_CONNMARK
616 tristate 'ctmark target and match support'
617 depends on NF_CONNTRACK
618 depends on NETFILTER_ADVANCED
619 select NF_CONNTRACK_MARK
621 This option adds the "CONNMARK" target and "connmark" match.
623 Netfilter allows you to store a mark value per connection (a.k.a.
624 ctmark), similarly to the packet mark (nfmark). Using this
625 target and match, you can set and match on this mark.
627 config NETFILTER_XT_SET
628 tristate 'set target and match support'
630 depends on NETFILTER_ADVANCED
632 This option adds the "SET" target and "set" match.
634 Using this target and match, you can add/delete and match
635 elements in the sets created by ipset(8).
637 To compile it as a module, choose M here. If unsure, say N.
639 # alphabetically ordered list of targets
641 comment "Xtables targets"
643 config NETFILTER_XT_TARGET_AUDIT
644 tristate "AUDIT target support"
646 depends on NETFILTER_ADVANCED
648 This option adds a 'AUDIT' target, which can be used to create
649 audit records for packets dropped/accepted.
651 To compileit as a module, choose M here. If unsure, say N.
653 config NETFILTER_XT_TARGET_CHECKSUM
654 tristate "CHECKSUM target support"
655 depends on IP_NF_MANGLE || IP6_NF_MANGLE
656 depends on NETFILTER_ADVANCED
658 This option adds a `CHECKSUM' target, which can be used in the iptables mangle
661 You can use this target to compute and fill in the checksum in
662 a packet that lacks a checksum. This is particularly useful,
663 if you need to work around old applications such as dhcp clients,
664 that do not work well with checksum offloads, but don't want to disable
665 checksum offload in your device.
667 To compile it as a module, choose M here. If unsure, say N.
669 config NETFILTER_XT_TARGET_CLASSIFY
670 tristate '"CLASSIFY" target support'
671 depends on NETFILTER_ADVANCED
673 This option adds a `CLASSIFY' target, which enables the user to set
674 the priority of a packet. Some qdiscs can use this value for
675 classification, among these are:
677 atm, cbq, dsmark, pfifo_fast, htb, prio
679 To compile it as a module, choose M here. If unsure, say N.
681 config NETFILTER_XT_TARGET_CONNMARK
682 tristate '"CONNMARK" target support'
683 depends on NF_CONNTRACK
684 depends on NETFILTER_ADVANCED
685 select NETFILTER_XT_CONNMARK
687 This is a backwards-compat option for the user's convenience
688 (e.g. when running oldconfig). It selects
689 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
691 config NETFILTER_XT_TARGET_CONNSECMARK
692 tristate '"CONNSECMARK" target support'
693 depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
694 default m if NETFILTER_ADVANCED=n
696 The CONNSECMARK target copies security markings from packets
697 to connections, and restores security markings from connections
698 to packets (if the packets are not already marked). This would
699 normally be used in conjunction with the SECMARK target.
701 To compile it as a module, choose M here. If unsure, say N.
703 config NETFILTER_XT_TARGET_CT
704 tristate '"CT" target support'
705 depends on NF_CONNTRACK
706 depends on IP_NF_RAW || IP6_NF_RAW
707 depends on NETFILTER_ADVANCED
709 This options adds a `CT' target, which allows to specify initial
710 connection tracking parameters like events to be delivered and
711 the helper to be used.
713 To compile it as a module, choose M here. If unsure, say N.
715 config NETFILTER_XT_TARGET_DSCP
716 tristate '"DSCP" and "TOS" target support'
717 depends on IP_NF_MANGLE || IP6_NF_MANGLE
718 depends on NETFILTER_ADVANCED
720 This option adds a `DSCP' target, which allows you to manipulate
721 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
723 The DSCP field can have any value between 0x0 and 0x3f inclusive.
725 It also adds the "TOS" target, which allows you to create rules in
726 the "mangle" table which alter the Type Of Service field of an IPv4
727 or the Priority field of an IPv6 packet, prior to routing.
729 To compile it as a module, choose M here. If unsure, say N.
731 config NETFILTER_XT_TARGET_HL
732 tristate '"HL" hoplimit target support'
733 depends on IP_NF_MANGLE || IP6_NF_MANGLE
734 depends on NETFILTER_ADVANCED
736 This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
737 targets, which enable the user to change the
738 hoplimit/time-to-live value of the IP header.
740 While it is safe to decrement the hoplimit/TTL value, the
741 modules also allow to increment and set the hoplimit value of
742 the header to arbitrary values. This is EXTREMELY DANGEROUS
743 since you can easily create immortal packets that loop
744 forever on the network.
746 config NETFILTER_XT_TARGET_HMARK
747 tristate '"HMARK" target support'
748 depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
749 depends on NETFILTER_ADVANCED
751 This option adds the "HMARK" target.
753 The target allows you to create rules in the "raw" and "mangle" tables
754 which set the skbuff mark by means of hash calculation within a given
755 range. The nfmark can influence the routing method and can also be used
756 by other subsystems to change their behaviour.
758 To compile it as a module, choose M here. If unsure, say N.
760 config NETFILTER_XT_TARGET_IDLETIMER
761 tristate "IDLETIMER target support"
762 depends on NETFILTER_ADVANCED
765 This option adds the `IDLETIMER' target. Each matching packet
766 resets the timer associated with label specified when the rule is
767 added. When the timer expires, it triggers a sysfs notification.
768 The remaining time for expiration can be read via sysfs.
770 To compile it as a module, choose M here. If unsure, say N.
772 config NETFILTER_XT_TARGET_LED
773 tristate '"LED" target support'
774 depends on LEDS_CLASS && LEDS_TRIGGERS
775 depends on NETFILTER_ADVANCED
777 This option adds a `LED' target, which allows you to blink LEDs in
778 response to particular packets passing through your machine.
780 This can be used to turn a spare LED into a network activity LED,
781 which only flashes in response to FTP transfers, for example. Or
782 you could have an LED which lights up for a minute or two every time
783 somebody connects to your machine via SSH.
785 You will need support for the "led" class to make this work.
787 To create an LED trigger for incoming SSH traffic:
788 iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
790 Then attach the new trigger to an LED on your system:
791 echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
793 For more information on the LEDs available on your system, see
794 Documentation/leds/leds-class.txt
796 config NETFILTER_XT_TARGET_LOG
797 tristate "LOG target support"
800 select NF_LOG_IPV6 if IPV6
801 default m if NETFILTER_ADVANCED=n
803 This option adds a `LOG' target, which allows you to create rules in
804 any iptables table which records the packet header to the syslog.
806 To compile it as a module, choose M here. If unsure, say N.
808 config NETFILTER_XT_TARGET_MARK
809 tristate '"MARK" target support'
810 depends on NETFILTER_ADVANCED
811 select NETFILTER_XT_MARK
813 This is a backwards-compat option for the user's convenience
814 (e.g. when running oldconfig). It selects
815 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
817 config NETFILTER_XT_NAT
818 tristate '"SNAT and DNAT" targets support'
821 This option enables the SNAT and DNAT targets.
823 To compile it as a module, choose M here. If unsure, say N.
825 config NETFILTER_XT_TARGET_NETMAP
826 tristate '"NETMAP" target support'
829 NETMAP is an implementation of static 1:1 NAT mapping of network
830 addresses. It maps the network address part, while keeping the host
833 To compile it as a module, choose M here. If unsure, say N.
835 config NETFILTER_XT_TARGET_NFLOG
836 tristate '"NFLOG" target support'
837 default m if NETFILTER_ADVANCED=n
838 select NETFILTER_NETLINK_LOG
840 This option enables the NFLOG target, which allows to LOG
841 messages through nfnetlink_log.
843 To compile it as a module, choose M here. If unsure, say N.
845 config NETFILTER_XT_TARGET_NFQUEUE
846 tristate '"NFQUEUE" target Support'
847 depends on NETFILTER_ADVANCED
848 select NETFILTER_NETLINK_QUEUE
850 This target replaced the old obsolete QUEUE target.
852 As opposed to QUEUE, it supports 65535 different queues,
855 To compile it as a module, choose M here. If unsure, say N.
857 config NETFILTER_XT_TARGET_NOTRACK
858 tristate '"NOTRACK" target support (DEPRECATED)'
859 depends on NF_CONNTRACK
860 depends on IP_NF_RAW || IP6_NF_RAW
861 depends on NETFILTER_ADVANCED
862 select NETFILTER_XT_TARGET_CT
864 config NETFILTER_XT_TARGET_RATEEST
865 tristate '"RATEEST" target support'
866 depends on NETFILTER_ADVANCED
868 This option adds a `RATEEST' target, which allows to measure
869 rates similar to TC estimators. The `rateest' match can be
870 used to match on the measured rates.
872 To compile it as a module, choose M here. If unsure, say N.
874 config NETFILTER_XT_TARGET_REDIRECT
875 tristate "REDIRECT target support"
877 select NF_NAT_REDIRECT
879 REDIRECT is a special case of NAT: all incoming connections are
880 mapped onto the incoming interface's address, causing the packets to
881 come to the local machine instead of passing through. This is
882 useful for transparent proxies.
884 To compile it as a module, choose M here. If unsure, say N.
886 config NETFILTER_XT_TARGET_TEE
887 tristate '"TEE" - packet cloning to alternate destination'
888 depends on NETFILTER_ADVANCED
889 depends on IPV6 || IPV6=n
890 depends on !NF_CONNTRACK || NF_CONNTRACK
892 select NF_DUP_IPV6 if IPV6
894 This option adds a "TEE" target with which a packet can be cloned and
895 this clone be rerouted to another nexthop.
897 config NETFILTER_XT_TARGET_TPROXY
898 tristate '"TPROXY" target transparent proxying support'
899 depends on NETFILTER_XTABLES
900 depends on NETFILTER_ADVANCED
901 depends on IPV6 || IPV6=n
902 depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
903 depends on IP_NF_MANGLE
904 select NF_DEFRAG_IPV4
905 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES != n
907 This option adds a `TPROXY' target, which is somewhat similar to
908 REDIRECT. It can only be used in the mangle table and is useful
909 to redirect traffic to a transparent proxy. It does _not_ depend
910 on Netfilter connection tracking and NAT, unlike REDIRECT.
911 For it to work you will have to configure certain iptables rules
912 and use policy routing. For more information on how to set it up
913 see Documentation/networking/tproxy.txt.
915 To compile it as a module, choose M here. If unsure, say N.
917 config NETFILTER_XT_TARGET_TRACE
918 tristate '"TRACE" target support'
919 depends on IP_NF_RAW || IP6_NF_RAW
920 depends on NETFILTER_ADVANCED
922 The TRACE target allows you to mark packets so that the kernel
923 will log every rule which match the packets as those traverse
924 the tables, chains, rules.
926 If you want to compile it as a module, say M here and read
927 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
929 config NETFILTER_XT_TARGET_SECMARK
930 tristate '"SECMARK" target support'
931 depends on NETWORK_SECMARK
932 default m if NETFILTER_ADVANCED=n
934 The SECMARK target allows security marking of network
935 packets, for use with security subsystems.
937 To compile it as a module, choose M here. If unsure, say N.
939 config NETFILTER_XT_TARGET_TCPMSS
940 tristate '"TCPMSS" target support'
941 depends on IPV6 || IPV6=n
942 default m if NETFILTER_ADVANCED=n
944 This option adds a `TCPMSS' target, which allows you to alter the
945 MSS value of TCP SYN packets, to control the maximum size for that
946 connection (usually limiting it to your outgoing interface's MTU
949 This is used to overcome criminally braindead ISPs or servers which
950 block ICMP Fragmentation Needed packets. The symptoms of this
951 problem are that everything works fine from your Linux
952 firewall/router, but machines behind it can never exchange large
954 1) Web browsers connect, then hang with no data received.
955 2) Small mail works fine, but large emails hang.
956 3) ssh works fine, but scp hangs after initial handshaking.
958 Workaround: activate this option and add a rule to your firewall
961 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
962 -j TCPMSS --clamp-mss-to-pmtu
964 To compile it as a module, choose M here. If unsure, say N.
966 config NETFILTER_XT_TARGET_TCPOPTSTRIP
967 tristate '"TCPOPTSTRIP" target support'
968 depends on IP_NF_MANGLE || IP6_NF_MANGLE
969 depends on NETFILTER_ADVANCED
971 This option adds a "TCPOPTSTRIP" target, which allows you to strip
972 TCP options from TCP packets.
974 # alphabetically ordered list of matches
976 comment "Xtables matches"
978 config NETFILTER_XT_MATCH_ADDRTYPE
979 tristate '"addrtype" address type match support'
980 default m if NETFILTER_ADVANCED=n
982 This option allows you to match what routing thinks of an address,
983 eg. UNICAST, LOCAL, BROADCAST, ...
985 If you want to compile it as a module, say M here and read
986 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
988 config NETFILTER_XT_MATCH_BPF
989 tristate '"bpf" match support'
990 depends on NETFILTER_ADVANCED
992 BPF matching applies a linux socket filter to each packet and
993 accepts those for which the filter returns non-zero.
995 To compile it as a module, choose M here. If unsure, say N.
997 config NETFILTER_XT_MATCH_CGROUP
998 tristate '"control group" match support'
999 depends on NETFILTER_ADVANCED
1001 select CGROUP_NET_CLASSID
1003 Socket/process control group matching allows you to match locally
1004 generated packets based on which net_cls control group processes
1007 config NETFILTER_XT_MATCH_CLUSTER
1008 tristate '"cluster" match support'
1009 depends on NF_CONNTRACK
1010 depends on NETFILTER_ADVANCED
1012 This option allows you to build work-load-sharing clusters of
1013 network servers/stateful firewalls without having a dedicated
1014 load-balancing router/server/switch. Basically, this match returns
1015 true when the packet must be handled by this cluster node. Thus,
1016 all nodes see all packets and this match decides which node handles
1017 what packets. The work-load sharing algorithm is based on source
1020 If you say Y or M here, try `iptables -m cluster --help` for
1023 config NETFILTER_XT_MATCH_COMMENT
1024 tristate '"comment" match support'
1025 depends on NETFILTER_ADVANCED
1027 This option adds a `comment' dummy-match, which allows you to put
1028 comments in your iptables ruleset.
1030 If you want to compile it as a module, say M here and read
1031 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1033 config NETFILTER_XT_MATCH_CONNBYTES
1034 tristate '"connbytes" per-connection counter match support'
1035 depends on NF_CONNTRACK
1036 depends on NETFILTER_ADVANCED
1038 This option adds a `connbytes' match, which allows you to match the
1039 number of bytes and/or packets for each direction within a connection.
1041 If you want to compile it as a module, say M here and read
1042 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1044 config NETFILTER_XT_MATCH_CONNLABEL
1045 tristate '"connlabel" match support'
1046 select NF_CONNTRACK_LABELS
1047 depends on NF_CONNTRACK
1048 depends on NETFILTER_ADVANCED
1050 This match allows you to test and assign userspace-defined labels names
1051 to a connection. The kernel only stores bit values - mapping
1052 names to bits is done by userspace.
1054 Unlike connmark, more than 32 flag bits may be assigned to a
1055 connection simultaneously.
1057 config NETFILTER_XT_MATCH_CONNLIMIT
1058 tristate '"connlimit" match support'
1059 depends on NF_CONNTRACK
1060 depends on NETFILTER_ADVANCED
1062 This match allows you to match against the number of parallel
1063 connections to a server per client IP address (or address block).
1065 config NETFILTER_XT_MATCH_CONNMARK
1066 tristate '"connmark" connection mark match support'
1067 depends on NF_CONNTRACK
1068 depends on NETFILTER_ADVANCED
1069 select NETFILTER_XT_CONNMARK
1071 This is a backwards-compat option for the user's convenience
1072 (e.g. when running oldconfig). It selects
1073 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
1075 config NETFILTER_XT_MATCH_CONNTRACK
1076 tristate '"conntrack" connection tracking match support'
1077 depends on NF_CONNTRACK
1078 default m if NETFILTER_ADVANCED=n
1080 This is a general conntrack match module, a superset of the state match.
1082 It allows matching on additional conntrack information, which is
1083 useful in complex configurations, such as NAT gateways with multiple
1084 internet links or tunnels.
1086 To compile it as a module, choose M here. If unsure, say N.
1088 config NETFILTER_XT_MATCH_CPU
1089 tristate '"cpu" match support'
1090 depends on NETFILTER_ADVANCED
1092 CPU matching allows you to match packets based on the CPU
1093 currently handling the packet.
1095 To compile it as a module, choose M here. If unsure, say N.
1097 config NETFILTER_XT_MATCH_DCCP
1098 tristate '"dccp" protocol match support'
1099 depends on NETFILTER_ADVANCED
1102 With this option enabled, you will be able to use the iptables
1103 `dccp' match in order to match on DCCP source/destination ports
1106 If you want to compile it as a module, say M here and read
1107 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1109 config NETFILTER_XT_MATCH_DEVGROUP
1110 tristate '"devgroup" match support'
1111 depends on NETFILTER_ADVANCED
1113 This options adds a `devgroup' match, which allows to match on the
1114 device group a network device is assigned to.
1116 To compile it as a module, choose M here. If unsure, say N.
1118 config NETFILTER_XT_MATCH_DSCP
1119 tristate '"dscp" and "tos" match support'
1120 depends on NETFILTER_ADVANCED
1122 This option adds a `DSCP' match, which allows you to match against
1123 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
1125 The DSCP field can have any value between 0x0 and 0x3f inclusive.
1127 It will also add a "tos" match, which allows you to match packets
1128 based on the Type Of Service fields of the IPv4 packet (which share
1129 the same bits as DSCP).
1131 To compile it as a module, choose M here. If unsure, say N.
1133 config NETFILTER_XT_MATCH_ECN
1134 tristate '"ecn" match support'
1135 depends on NETFILTER_ADVANCED
1137 This option adds an "ECN" match, which allows you to match against
1138 the IPv4 and TCP header ECN fields.
1140 To compile it as a module, choose M here. If unsure, say N.
1142 config NETFILTER_XT_MATCH_ESP
1143 tristate '"esp" match support'
1144 depends on NETFILTER_ADVANCED
1146 This match extension allows you to match a range of SPIs
1147 inside ESP header of IPSec packets.
1149 To compile it as a module, choose M here. If unsure, say N.
1151 config NETFILTER_XT_MATCH_HASHLIMIT
1152 tristate '"hashlimit" match support'
1153 depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
1154 depends on NETFILTER_ADVANCED
1156 This option adds a `hashlimit' match.
1158 As opposed to `limit', this match dynamically creates a hash table
1159 of limit buckets, based on your selection of source/destination
1160 addresses and/or ports.
1162 It enables you to express policies like `10kpps for any given
1163 destination address' or `500pps from any given source address'
1166 config NETFILTER_XT_MATCH_HELPER
1167 tristate '"helper" match support'
1168 depends on NF_CONNTRACK
1169 depends on NETFILTER_ADVANCED
1171 Helper matching allows you to match packets in dynamic connections
1172 tracked by a conntrack-helper, ie. ip_conntrack_ftp
1174 To compile it as a module, choose M here. If unsure, say Y.
1176 config NETFILTER_XT_MATCH_HL
1177 tristate '"hl" hoplimit/TTL match support'
1178 depends on NETFILTER_ADVANCED
1180 HL matching allows you to match packets based on the hoplimit
1181 in the IPv6 header, or the time-to-live field in the IPv4
1182 header of the packet.
1184 config NETFILTER_XT_MATCH_IPCOMP
1185 tristate '"ipcomp" match support'
1186 depends on NETFILTER_ADVANCED
1188 This match extension allows you to match a range of CPIs(16 bits)
1189 inside IPComp header of IPSec packets.
1191 To compile it as a module, choose M here. If unsure, say N.
1193 config NETFILTER_XT_MATCH_IPRANGE
1194 tristate '"iprange" address range match support'
1195 depends on NETFILTER_ADVANCED
1197 This option adds a "iprange" match, which allows you to match based on
1198 an IP address range. (Normal iptables only matches on single addresses
1199 with an optional mask.)
1203 config NETFILTER_XT_MATCH_IPVS
1204 tristate '"ipvs" match support'
1206 depends on NETFILTER_ADVANCED
1207 depends on NF_CONNTRACK
1209 This option allows you to match against IPVS properties of a packet.
1213 config NETFILTER_XT_MATCH_L2TP
1214 tristate '"l2tp" match support'
1215 depends on NETFILTER_ADVANCED
1218 This option adds an "L2TP" match, which allows you to match against
1219 L2TP protocol header fields.
1221 To compile it as a module, choose M here. If unsure, say N.
1223 config NETFILTER_XT_MATCH_LENGTH
1224 tristate '"length" match support'
1225 depends on NETFILTER_ADVANCED
1227 This option allows you to match the length of a packet against a
1228 specific value or range of values.
1230 To compile it as a module, choose M here. If unsure, say N.
1232 config NETFILTER_XT_MATCH_LIMIT
1233 tristate '"limit" match support'
1234 depends on NETFILTER_ADVANCED
1236 limit matching allows you to control the rate at which a rule can be
1237 matched: mainly useful in combination with the LOG target ("LOG
1238 target support", below) and to avoid some Denial of Service attacks.
1240 To compile it as a module, choose M here. If unsure, say N.
1242 config NETFILTER_XT_MATCH_MAC
1243 tristate '"mac" address match support'
1244 depends on NETFILTER_ADVANCED
1246 MAC matching allows you to match packets based on the source
1247 Ethernet address of the packet.
1249 To compile it as a module, choose M here. If unsure, say N.
1251 config NETFILTER_XT_MATCH_MARK
1252 tristate '"mark" match support'
1253 depends on NETFILTER_ADVANCED
1254 select NETFILTER_XT_MARK
1256 This is a backwards-compat option for the user's convenience
1257 (e.g. when running oldconfig). It selects
1258 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
1260 config NETFILTER_XT_MATCH_MULTIPORT
1261 tristate '"multiport" Multiple port match support'
1262 depends on NETFILTER_ADVANCED
1264 Multiport matching allows you to match TCP or UDP packets based on
1265 a series of source or destination ports: normally a rule can only
1266 match a single range of ports.
1268 To compile it as a module, choose M here. If unsure, say N.
1270 config NETFILTER_XT_MATCH_NFACCT
1271 tristate '"nfacct" match support'
1272 depends on NETFILTER_ADVANCED
1273 select NETFILTER_NETLINK_ACCT
1275 This option allows you to use the extended accounting through
1278 To compile it as a module, choose M here. If unsure, say N.
1280 config NETFILTER_XT_MATCH_OSF
1281 tristate '"osf" Passive OS fingerprint match'
1282 depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
1284 This option selects the Passive OS Fingerprinting match module
1285 that allows to passively match the remote operating system by
1286 analyzing incoming TCP SYN packets.
1288 Rules and loading software can be downloaded from
1289 http://www.ioremap.net/projects/osf
1291 To compile it as a module, choose M here. If unsure, say N.
1293 config NETFILTER_XT_MATCH_OWNER
1294 tristate '"owner" match support'
1295 depends on NETFILTER_ADVANCED
1297 Socket owner matching allows you to match locally-generated packets
1298 based on who created the socket: the user or group. It is also
1299 possible to check whether a socket actually exists.
1301 config NETFILTER_XT_MATCH_POLICY
1302 tristate 'IPsec "policy" match support'
1304 default m if NETFILTER_ADVANCED=n
1306 Policy matching allows you to match packets based on the
1307 IPsec policy that was used during decapsulation/will
1308 be used during encapsulation.
1310 To compile it as a module, choose M here. If unsure, say N.
1312 config NETFILTER_XT_MATCH_PHYSDEV
1313 tristate '"physdev" match support'
1314 depends on BRIDGE && BRIDGE_NETFILTER
1315 depends on NETFILTER_ADVANCED
1317 Physdev packet matching matches against the physical bridge ports
1318 the IP packet arrived on or will leave by.
1320 To compile it as a module, choose M here. If unsure, say N.
1322 config NETFILTER_XT_MATCH_PKTTYPE
1323 tristate '"pkttype" packet type match support'
1324 depends on NETFILTER_ADVANCED
1326 Packet type matching allows you to match a packet by
1327 its "class", eg. BROADCAST, MULTICAST, ...
1330 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
1332 To compile it as a module, choose M here. If unsure, say N.
1334 config NETFILTER_XT_MATCH_QUOTA
1335 tristate '"quota" match support'
1336 depends on NETFILTER_ADVANCED
1338 This option adds a `quota' match, which allows to match on a
1341 If you want to compile it as a module, say M here and read
1342 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1344 config NETFILTER_XT_MATCH_RATEEST
1345 tristate '"rateest" match support'
1346 depends on NETFILTER_ADVANCED
1347 select NETFILTER_XT_TARGET_RATEEST
1349 This option adds a `rateest' match, which allows to match on the
1350 rate estimated by the RATEEST target.
1352 To compile it as a module, choose M here. If unsure, say N.
1354 config NETFILTER_XT_MATCH_REALM
1355 tristate '"realm" match support'
1356 depends on NETFILTER_ADVANCED
1357 select IP_ROUTE_CLASSID
1359 This option adds a `realm' match, which allows you to use the realm
1360 key from the routing subsystem inside iptables.
1362 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
1365 If you want to compile it as a module, say M here and read
1366 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1368 config NETFILTER_XT_MATCH_RECENT
1369 tristate '"recent" match support'
1370 depends on NETFILTER_ADVANCED
1372 This match is used for creating one or many lists of recently
1373 used addresses and then matching against that/those list(s).
1375 Short options are available by using 'iptables -m recent -h'
1376 Official Website: <http://snowman.net/projects/ipt_recent/>
1378 config NETFILTER_XT_MATCH_SCTP
1379 tristate '"sctp" protocol match support'
1380 depends on NETFILTER_ADVANCED
1383 With this option enabled, you will be able to use the
1384 `sctp' match in order to match on SCTP source/destination ports
1385 and SCTP chunk types.
1387 If you want to compile it as a module, say M here and read
1388 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
1390 config NETFILTER_XT_MATCH_SOCKET
1391 tristate '"socket" match support'
1392 depends on NETFILTER_XTABLES
1393 depends on NETFILTER_ADVANCED
1394 depends on !NF_CONNTRACK || NF_CONNTRACK
1395 depends on IPV6 || IPV6=n
1396 depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
1397 select NF_DEFRAG_IPV4
1398 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES != n
1400 This option adds a `socket' match, which can be used to match
1401 packets for which a TCP or UDP socket lookup finds a valid socket.
1402 It can be used in combination with the MARK target and policy
1403 routing to implement full featured non-locally bound sockets.
1405 To compile it as a module, choose M here. If unsure, say N.
1407 config NETFILTER_XT_MATCH_STATE
1408 tristate '"state" match support'
1409 depends on NF_CONNTRACK
1410 default m if NETFILTER_ADVANCED=n
1412 Connection state matching allows you to match packets based on their
1413 relationship to a tracked connection (ie. previous packets). This
1414 is a powerful tool for packet classification.
1416 To compile it as a module, choose M here. If unsure, say N.
1418 config NETFILTER_XT_MATCH_STATISTIC
1419 tristate '"statistic" match support'
1420 depends on NETFILTER_ADVANCED
1422 This option adds a `statistic' match, which allows you to match
1423 on packets periodically or randomly with a given percentage.
1425 To compile it as a module, choose M here. If unsure, say N.
1427 config NETFILTER_XT_MATCH_STRING
1428 tristate '"string" match support'
1429 depends on NETFILTER_ADVANCED
1431 select TEXTSEARCH_KMP
1432 select TEXTSEARCH_BM
1433 select TEXTSEARCH_FSM
1435 This option adds a `string' match, which allows you to look for
1436 pattern matchings in packets.
1438 To compile it as a module, choose M here. If unsure, say N.
1440 config NETFILTER_XT_MATCH_TCPMSS
1441 tristate '"tcpmss" match support'
1442 depends on NETFILTER_ADVANCED
1444 This option adds a `tcpmss' match, which allows you to examine the
1445 MSS value of TCP SYN packets, which control the maximum packet size
1446 for that connection.
1448 To compile it as a module, choose M here. If unsure, say N.
1450 config NETFILTER_XT_MATCH_TIME
1451 tristate '"time" match support'
1452 depends on NETFILTER_ADVANCED
1454 This option adds a "time" match, which allows you to match based on
1455 the packet arrival time (at the machine which netfilter is running)
1456 on) or departure time/date (for locally generated packets).
1458 If you say Y here, try `iptables -m time --help` for
1461 If you want to compile it as a module, say M here.
1464 config NETFILTER_XT_MATCH_U32
1465 tristate '"u32" match support'
1466 depends on NETFILTER_ADVANCED
1468 u32 allows you to extract quantities of up to 4 bytes from a packet,
1469 AND them with specified masks, shift them by specified amounts and
1470 test whether the results are in any of a set of specified ranges.
1471 The specification of what to extract is general enough to skip over
1472 headers with lengths stored in the packet, as in IP or TCP header
1475 Details and examples are in the kernel module source.
1477 endif # NETFILTER_XTABLES
1481 source "net/netfilter/ipset/Kconfig"
1483 source "net/netfilter/ipvs/Kconfig"