1 # SPDX-License-Identifier: GPL-2.0-only
2 menu "Core Netfilter Configuration"
3 depends on NET && INET && NETFILTER
5 config NETFILTER_INGRESS
6 bool "Netfilter ingress support"
10 This allows you to classify packets from ingress using the Netfilter
13 config NETFILTER_EGRESS
14 bool "Netfilter egress support"
18 This allows you to classify packets before transmission using the
19 Netfilter infrastructure.
21 config NETFILTER_NETLINK
24 config NETFILTER_FAMILY_BRIDGE
27 config NETFILTER_FAMILY_ARP
30 config NETFILTER_NETLINK_ACCT
31 tristate "Netfilter NFACCT over NFNETLINK interface"
32 depends on NETFILTER_ADVANCED
33 select NETFILTER_NETLINK
35 If this option is enabled, the kernel will include support
36 for extended accounting via NFNETLINK.
38 config NETFILTER_NETLINK_QUEUE
39 tristate "Netfilter NFQUEUE over NFNETLINK interface"
40 depends on NETFILTER_ADVANCED
41 select NETFILTER_NETLINK
43 If this option is enabled, the kernel will include support
44 for queueing packets via NFNETLINK.
46 config NETFILTER_NETLINK_LOG
47 tristate "Netfilter LOG over NFNETLINK interface"
48 default m if NETFILTER_ADVANCED=n
49 select NETFILTER_NETLINK
51 If this option is enabled, the kernel will include support
52 for logging packets via NFNETLINK.
54 This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
55 and is also scheduled to replace the old syslog-based ipt_LOG
58 config NETFILTER_NETLINK_OSF
59 tristate "Netfilter OSF over NFNETLINK interface"
60 depends on NETFILTER_ADVANCED
61 select NETFILTER_NETLINK
63 If this option is enabled, the kernel will include support
64 for passive OS fingerprint via NFNETLINK.
67 tristate "Netfilter connection tracking support"
68 default m if NETFILTER_ADVANCED=n
70 select NF_DEFRAG_IPV6 if IPV6 != n
72 Connection tracking keeps a record of what packets have passed
73 through your machine, in order to figure out how they are related
76 This is required to do Masquerading or other kinds of Network
77 Address Translation. It can also be used to enhance packet
78 filtering (see `Connection state match support' below).
80 To compile it as a module, choose M here. If unsure, say N.
86 tristate "Netdev packet logging"
90 config NETFILTER_CONNCOUNT
93 config NF_CONNTRACK_MARK
94 bool 'Connection mark tracking support'
95 depends on NETFILTER_ADVANCED
97 This option enables support for connection marks, used by the
98 `CONNMARK' target and `connmark' match. Similar to the mark value
99 of packets, but this mark value is kept in the conntrack session
100 instead of the individual packets.
102 config NF_CONNTRACK_SECMARK
103 bool 'Connection tracking security mark support'
104 depends on NETWORK_SECMARK
105 default m if NETFILTER_ADVANCED=n
107 This option enables security markings to be applied to
108 connections. Typically they are copied to connections from
109 packets using the CONNSECMARK target and copied back from
110 connections to packets with the same target, with the packets
111 being originally labeled via SECMARK.
115 config NF_CONNTRACK_ZONES
116 bool 'Connection tracking zones'
117 depends on NETFILTER_ADVANCED
119 This option enables support for connection tracking zones.
120 Normally, each connection needs to have a unique system wide
121 identity. Connection tracking zones allow to have multiple
122 connections using the same identity, as long as they are
123 contained in different zones.
127 config NF_CONNTRACK_PROCFS
128 bool "Supply CT list in procfs (OBSOLETE)"
132 This option enables for the list of known conntrack entries
133 to be shown in procfs under net/netfilter/nf_conntrack. This
134 is considered obsolete in favor of using the conntrack(8)
135 tool which uses Netlink.
137 config NF_CONNTRACK_EVENTS
138 bool "Connection tracking events"
139 depends on NETFILTER_ADVANCED
141 If this option is enabled, the connection tracking code will
142 provide a notifier chain that can be used by other kernel code
143 to get notified about changes in the connection tracking state.
147 config NF_CONNTRACK_TIMEOUT
148 bool 'Connection tracking timeout'
149 depends on NETFILTER_ADVANCED
151 This option enables support for connection tracking timeout
152 extension. This allows you to attach timeout policies to flow
157 config NF_CONNTRACK_TIMESTAMP
158 bool 'Connection tracking timestamping'
159 depends on NETFILTER_ADVANCED
161 This option enables support for connection tracking timestamping.
162 This allows you to store the flow start-time and to obtain
163 the flow-stop time (once it has been destroyed) via Connection
168 config NF_CONNTRACK_LABELS
169 bool "Connection tracking labels"
171 This option enables support for assigning user-defined flag bits
172 to connection tracking entries. It can be used with xtables connlabel
173 match and the nftables ct expression.
175 config NF_CT_PROTO_DCCP
176 bool 'DCCP protocol connection tracking support'
177 depends on NETFILTER_ADVANCED
180 With this option enabled, the layer 3 independent connection
181 tracking code will be able to do state tracking on DCCP connections.
185 config NF_CT_PROTO_GRE
188 config NF_CT_PROTO_SCTP
189 bool 'SCTP protocol connection tracking support'
190 depends on NETFILTER_ADVANCED
194 With this option enabled, the layer 3 independent connection
195 tracking code will be able to do state tracking on SCTP connections.
199 config NF_CT_PROTO_UDPLITE
200 bool 'UDP-Lite protocol connection tracking support'
201 depends on NETFILTER_ADVANCED
204 With this option enabled, the layer 3 independent connection
205 tracking code will be able to do state tracking on UDP-Lite
210 config NF_CONNTRACK_AMANDA
211 tristate "Amanda backup protocol support"
212 depends on NETFILTER_ADVANCED
214 select TEXTSEARCH_KMP
216 If you are running the Amanda backup package <http://www.amanda.org/>
217 on this machine or machines that will be MASQUERADED through this
218 machine, then you may want to enable this feature. This allows the
219 connection tracking and natting code to allow the sub-channels that
220 Amanda requires for communication of the backup data, messages and
223 To compile it as a module, choose M here. If unsure, say N.
225 config NF_CONNTRACK_FTP
226 tristate "FTP protocol support"
227 default m if NETFILTER_ADVANCED=n
229 Tracking FTP connections is problematic: special helpers are
230 required for tracking them, and doing masquerading and other forms
231 of Network Address Translation on them.
233 This is FTP support on Layer 3 independent connection tracking.
235 To compile it as a module, choose M here. If unsure, say N.
237 config NF_CONNTRACK_H323
238 tristate "H.323 protocol support"
239 depends on IPV6 || IPV6=n
240 depends on NETFILTER_ADVANCED
242 H.323 is a VoIP signalling protocol from ITU-T. As one of the most
243 important VoIP protocols, it is widely used by voice hardware and
244 software including voice gateways, IP phones, Netmeeting, OpenPhone,
247 With this module you can support H.323 on a connection tracking/NAT
250 This module supports RAS, Fast Start, H.245 Tunnelling, Call
251 Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
252 whiteboard, file transfer, etc. For more information, please
253 visit http://nath323.sourceforge.net/.
255 To compile it as a module, choose M here. If unsure, say N.
257 config NF_CONNTRACK_IRC
258 tristate "IRC protocol support"
259 default m if NETFILTER_ADVANCED=n
261 There is a commonly-used extension to IRC called
262 Direct Client-to-Client Protocol (DCC). This enables users to send
263 files to each other, and also chat to each other without the need
264 of a server. DCC Sending is used anywhere you send files over IRC,
265 and DCC Chat is most commonly used by Eggdrop bots. If you are
266 using NAT, this extension will enable you to send files and initiate
267 chats. Note that you do NOT need this extension to get files or
268 have others initiate chats, or everything else in IRC.
270 To compile it as a module, choose M here. If unsure, say N.
272 config NF_CONNTRACK_BROADCAST
275 config NF_CONNTRACK_NETBIOS_NS
276 tristate "NetBIOS name service protocol support"
277 select NF_CONNTRACK_BROADCAST
279 NetBIOS name service requests are sent as broadcast messages from an
280 unprivileged port and responded to with unicast messages to the
281 same port. This make them hard to firewall properly because connection
282 tracking doesn't deal with broadcasts. This helper tracks locally
283 originating NetBIOS name service requests and the corresponding
284 responses. It relies on correct IP address configuration, specifically
285 netmask and broadcast address. When properly configured, the output
286 of "ip address show" should look similar to this:
288 $ ip -4 address show eth0
289 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
290 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
292 To compile it as a module, choose M here. If unsure, say N.
294 config NF_CONNTRACK_SNMP
295 tristate "SNMP service protocol support"
296 depends on NETFILTER_ADVANCED
297 select NF_CONNTRACK_BROADCAST
299 SNMP service requests are sent as broadcast messages from an
300 unprivileged port and responded to with unicast messages to the
301 same port. This make them hard to firewall properly because connection
302 tracking doesn't deal with broadcasts. This helper tracks locally
303 originating SNMP service requests and the corresponding
304 responses. It relies on correct IP address configuration, specifically
305 netmask and broadcast address.
307 To compile it as a module, choose M here. If unsure, say N.
309 config NF_CONNTRACK_PPTP
310 tristate "PPtP protocol support"
311 depends on NETFILTER_ADVANCED
312 select NF_CT_PROTO_GRE
314 This module adds support for PPTP (Point to Point Tunnelling
315 Protocol, RFC2637) connection tracking and NAT.
317 If you are running PPTP sessions over a stateful firewall or NAT
318 box, you may want to enable this feature.
320 Please note that not all PPTP modes of operation are supported yet.
321 Specifically these limitations exist:
322 - Blindly assumes that control connections are always established
323 in PNS->PAC direction. This is a violation of RFC2637.
324 - Only supports a single call within each session
326 To compile it as a module, choose M here. If unsure, say N.
328 config NF_CONNTRACK_SANE
329 tristate "SANE protocol support"
330 depends on NETFILTER_ADVANCED
332 SANE is a protocol for remote access to scanners as implemented
333 by the 'saned' daemon. Like FTP, it uses separate control and
336 With this module you can support SANE on a connection tracking
339 To compile it as a module, choose M here. If unsure, say N.
341 config NF_CONNTRACK_SIP
342 tristate "SIP protocol support"
343 default m if NETFILTER_ADVANCED=n
345 SIP is an application-layer control protocol that can establish,
346 modify, and terminate multimedia sessions (conferences) such as
347 Internet telephony calls. With the nf_conntrack_sip and
348 the nf_nat_sip modules you can support the protocol on a connection
349 tracking/NATing firewall.
351 To compile it as a module, choose M here. If unsure, say N.
353 config NF_CONNTRACK_TFTP
354 tristate "TFTP protocol support"
355 depends on NETFILTER_ADVANCED
357 TFTP connection tracking helper, this is required depending
358 on how restrictive your ruleset is.
359 If you are using a tftp client behind -j SNAT or -j MASQUERADING
362 To compile it as a module, choose M here. If unsure, say N.
365 tristate 'Connection tracking netlink interface'
366 select NETFILTER_NETLINK
367 default m if NETFILTER_ADVANCED=n
369 This option enables support for a netlink-based userspace interface
371 config NF_CT_NETLINK_TIMEOUT
372 tristate 'Connection tracking timeout tuning via Netlink'
373 select NETFILTER_NETLINK
374 depends on NETFILTER_ADVANCED
375 depends on NF_CONNTRACK_TIMEOUT
377 This option enables support for connection tracking timeout
378 fine-grain tuning. This allows you to attach specific timeout
379 policies to flows, instead of using the global timeout policy.
383 config NF_CT_NETLINK_HELPER
384 tristate 'Connection tracking helpers in user-space via Netlink'
385 select NETFILTER_NETLINK
386 depends on NF_CT_NETLINK
387 depends on NETFILTER_NETLINK_QUEUE
388 depends on NETFILTER_NETLINK_GLUE_CT
389 depends on NETFILTER_ADVANCED
391 This option enables the user-space connection tracking helpers
396 config NETFILTER_NETLINK_GLUE_CT
397 bool "NFQUEUE and NFLOG integration with Connection Tracking"
399 depends on (NETFILTER_NETLINK_QUEUE || NETFILTER_NETLINK_LOG) && NF_CT_NETLINK
401 If this option is enabled, NFQUEUE and NFLOG can include
402 Connection Tracking information together with the packet is
403 the enqueued via NFNETLINK.
406 tristate "Network Address Translation support"
407 depends on NF_CONNTRACK
408 default m if NETFILTER_ADVANCED=n
410 The NAT option allows masquerading, port forwarding and other
411 forms of full Network Address Port Translation. This can be
412 controlled by iptables, ip6tables or nft.
416 depends on NF_CONNTRACK && NF_NAT
417 default NF_NAT && NF_CONNTRACK_AMANDA
421 depends on NF_CONNTRACK && NF_NAT
422 default NF_NAT && NF_CONNTRACK_FTP
426 depends on NF_CONNTRACK && NF_NAT
427 default NF_NAT && NF_CONNTRACK_IRC
431 depends on NF_CONNTRACK && NF_NAT
432 default NF_NAT && NF_CONNTRACK_SIP
436 depends on NF_CONNTRACK && NF_NAT
437 default NF_NAT && NF_CONNTRACK_TFTP
439 config NF_NAT_REDIRECT
442 config NF_NAT_MASQUERADE
445 config NETFILTER_SYNPROXY
451 select NETFILTER_NETLINK
452 tristate "Netfilter nf_tables support"
454 nftables is the new packet classification framework that intends to
455 replace the existing {ip,ip6,arp,eb}_tables infrastructure. It
456 provides a pseudo-state machine with an extensible instruction-set
457 (also known as expressions) that the userspace 'nft' utility
458 (http://www.netfilter.org/projects/nftables) uses to build the
459 rule-set. It also comes with the generic set infrastructure that
460 allows you to construct mappings between matchings and actions
461 for performance lookups.
463 To compile it as a module, choose M here.
466 config NF_TABLES_INET
468 select NF_TABLES_IPV4
469 select NF_TABLES_IPV6
470 bool "Netfilter nf_tables mixed IPv4/IPv6 tables support"
472 This option enables support for a mixed IPv4/IPv6 "inet" table.
474 config NF_TABLES_NETDEV
475 bool "Netfilter nf_tables netdev tables support"
477 This option enables support for the "netdev" table.
480 tristate "Netfilter nf_tables number generator module"
482 This option adds the number generator expression used to perform
483 incremental counting and random numbers bound to a upper limit.
486 depends on NF_CONNTRACK
487 tristate "Netfilter nf_tables conntrack module"
489 This option adds the "ct" expression that you can use to match
490 connection tracking information such as the flow state.
492 config NFT_FLOW_OFFLOAD
493 depends on NF_CONNTRACK && NF_FLOW_TABLE
494 tristate "Netfilter nf_tables hardware flow offload module"
496 This option adds the "flow_offload" expression that you can use to
497 choose what flows are placed into the hardware.
500 tristate "Netfilter nf_tables counter module"
502 This option adds the "counter" expression that you can use to
503 include packet and byte counters in a rule.
506 tristate "Netfilter nf_tables connlimit module"
507 depends on NF_CONNTRACK
508 depends on NETFILTER_ADVANCED
509 select NETFILTER_CONNCOUNT
511 This option adds the "connlimit" expression that you can use to
512 ratelimit rule matchings per connections.
515 tristate "Netfilter nf_tables log module"
517 This option adds the "log" expression that you can use to log
518 packets matching some criteria.
521 tristate "Netfilter nf_tables limit module"
523 This option adds the "limit" expression that you can use to
524 ratelimit rule matchings.
527 depends on NF_CONNTRACK
529 select NF_NAT_MASQUERADE
530 tristate "Netfilter nf_tables masquerade support"
532 This option adds the "masquerade" expression that you can use
533 to perform NAT in the masquerade flavour.
536 depends on NF_CONNTRACK
538 tristate "Netfilter nf_tables redirect support"
539 select NF_NAT_REDIRECT
541 This options adds the "redirect" expression that you can use
542 to perform NAT in the redirect flavour.
545 depends on NF_CONNTRACK
547 depends on NF_TABLES_IPV4 || NF_TABLES_IPV6
548 tristate "Netfilter nf_tables nat module"
550 This option adds the "nat" expression that you can use to perform
551 typical Network Address Translation (NAT) packet transformations.
554 tristate "Netfilter nf_tables tunnel module"
556 This option adds the "tunnel" expression that you can use to set
560 tristate "Netfilter nf_tables stateful object reference module"
562 This option adds the "objref" expression that allows you to refer to
563 stateful objects, such as counters and quotas.
566 depends on NETFILTER_NETLINK_QUEUE
567 tristate "Netfilter nf_tables queue module"
569 This is required if you intend to use the userspace queueing
570 infrastructure (also known as NFQUEUE) from nftables.
573 tristate "Netfilter nf_tables quota module"
575 This option adds the "quota" expression that you can use to match
576 enforce bytes quotas.
579 default m if NETFILTER_ADVANCED=n
580 tristate "Netfilter nf_tables reject support"
581 depends on !NF_TABLES_INET || (IPV6!=m || m)
583 This option adds the "reject" expression that you can use to
584 explicitly deny and notify via TCP reset/ICMP informational errors
587 config NFT_REJECT_INET
588 depends on NF_TABLES_INET
593 depends on NETFILTER_XTABLES
594 tristate "Netfilter x_tables over nf_tables module"
596 This is required if you intend to use any of existing
597 x_tables match/target extensions over the nf_tables
601 tristate "Netfilter nf_tables hash module"
603 This option adds the "hash" expression that you can use to perform
604 a hash operation on registers.
610 depends on NF_TABLES_INET
611 depends on NFT_FIB_IPV4
612 depends on NFT_FIB_IPV6
613 tristate "Netfilter nf_tables fib inet support"
615 This option allows using the FIB expression from the inet table.
616 The lookup will be delegated to the IPv4 or IPv6 FIB depending
617 on the protocol of the packet.
620 tristate "Netfilter nf_tables xfrm/IPSec security association matching"
623 This option adds an expression that you can use to extract properties
624 of a packets security association.
627 tristate "Netfilter nf_tables socket match support"
628 depends on IPV6 || IPV6=n
629 select NF_SOCKET_IPV4
630 select NF_SOCKET_IPV6 if NF_TABLES_IPV6
632 This option allows matching for the presence or absence of a
633 corresponding socket and its attributes.
636 tristate "Netfilter nf_tables passive OS fingerprint support"
637 depends on NETFILTER_ADVANCED
638 select NETFILTER_NETLINK_OSF
640 This option allows matching packets from an specific OS.
643 tristate "Netfilter nf_tables tproxy support"
644 depends on IPV6 || IPV6=n
645 select NF_DEFRAG_IPV4
646 select NF_DEFRAG_IPV6 if NF_TABLES_IPV6
647 select NF_TPROXY_IPV4
648 select NF_TPROXY_IPV6 if NF_TABLES_IPV6
650 This makes transparent proxy support available in nftables.
653 tristate "Netfilter nf_tables SYNPROXY expression support"
654 depends on NF_CONNTRACK && NETFILTER_ADVANCED
655 select NETFILTER_SYNPROXY
658 The SYNPROXY expression allows you to intercept TCP connections and
659 establish them using syncookies before they are passed on to the
660 server. This allows to avoid conntrack and server resource usage
661 during SYN-flood attacks.
666 tristate "Netfilter packet duplication support"
668 This option enables the generic packet duplication infrastructure
671 config NFT_DUP_NETDEV
672 tristate "Netfilter nf_tables netdev packet duplication support"
675 This option enables packet duplication for the "netdev" family.
677 config NFT_FWD_NETDEV
678 tristate "Netfilter nf_tables netdev packet forwarding support"
681 This option enables packet forwarding for the "netdev" family.
683 config NFT_FIB_NETDEV
684 depends on NFT_FIB_IPV4
685 depends on NFT_FIB_IPV6
686 tristate "Netfilter nf_tables netdev fib lookups support"
688 This option allows using the FIB expression from the netdev table.
689 The lookup will be delegated to the IPv4 or IPv6 FIB depending
690 on the protocol of the packet.
692 endif # NF_TABLES_NETDEV
696 config NF_FLOW_TABLE_INET
697 tristate "Netfilter flow table mixed IPv4/IPv6 module"
698 depends on NF_FLOW_TABLE
700 This option adds the flow table mixed IPv4/IPv6 support.
702 To compile it as a module, choose M here.
705 tristate "Netfilter flow table module"
706 depends on NETFILTER_INGRESS
707 depends on NF_CONNTRACK
710 This option adds the flow table core infrastructure.
712 To compile it as a module, choose M here.
714 config NETFILTER_XTABLES
715 tristate "Netfilter Xtables support (required for ip_tables)"
716 default m if NETFILTER_ADVANCED=n
718 This is required if you intend to use any of ip_tables,
719 ip6_tables or arp_tables.
723 comment "Xtables combined modules"
725 config NETFILTER_XT_MARK
726 tristate 'nfmark target and match support'
727 default m if NETFILTER_ADVANCED=n
729 This option adds the "MARK" target and "mark" match.
731 Netfilter mark matching allows you to match packets based on the
732 "nfmark" value in the packet.
733 The target allows you to create rules in the "mangle" table which alter
734 the netfilter mark (nfmark) field associated with the packet.
736 Prior to routing, the nfmark can influence the routing method and can
737 also be used by other subsystems to change their behavior.
739 config NETFILTER_XT_CONNMARK
740 tristate 'ctmark target and match support'
741 depends on NF_CONNTRACK
742 depends on NETFILTER_ADVANCED
743 select NF_CONNTRACK_MARK
745 This option adds the "CONNMARK" target and "connmark" match.
747 Netfilter allows you to store a mark value per connection (a.k.a.
748 ctmark), similarly to the packet mark (nfmark). Using this
749 target and match, you can set and match on this mark.
751 config NETFILTER_XT_SET
752 tristate 'set target and match support'
754 depends on NETFILTER_ADVANCED
756 This option adds the "SET" target and "set" match.
758 Using this target and match, you can add/delete and match
759 elements in the sets created by ipset(8).
761 To compile it as a module, choose M here. If unsure, say N.
763 # alphabetically ordered list of targets
765 comment "Xtables targets"
767 config NETFILTER_XT_TARGET_AUDIT
768 tristate "AUDIT target support"
770 depends on NETFILTER_ADVANCED
772 This option adds a 'AUDIT' target, which can be used to create
773 audit records for packets dropped/accepted.
775 To compileit as a module, choose M here. If unsure, say N.
777 config NETFILTER_XT_TARGET_CHECKSUM
778 tristate "CHECKSUM target support"
779 depends on IP_NF_MANGLE || IP6_NF_MANGLE
780 depends on NETFILTER_ADVANCED
782 This option adds a `CHECKSUM' target, which can be used in the iptables mangle
783 table to work around buggy DHCP clients in virtualized environments.
785 Some old DHCP clients drop packets because they are not aware
786 that the checksum would normally be offloaded to hardware and
787 thus should be considered valid.
788 This target can be used to fill in the checksum using iptables
789 when such packets are sent via a virtual network device.
791 To compile it as a module, choose M here. If unsure, say N.
793 config NETFILTER_XT_TARGET_CLASSIFY
794 tristate '"CLASSIFY" target support'
795 depends on NETFILTER_ADVANCED
797 This option adds a `CLASSIFY' target, which enables the user to set
798 the priority of a packet. Some qdiscs can use this value for
799 classification, among these are:
801 atm, cbq, dsmark, pfifo_fast, htb, prio
803 To compile it as a module, choose M here. If unsure, say N.
805 config NETFILTER_XT_TARGET_CONNMARK
806 tristate '"CONNMARK" target support'
807 depends on NF_CONNTRACK
808 depends on NETFILTER_ADVANCED
809 select NETFILTER_XT_CONNMARK
811 This is a backwards-compat option for the user's convenience
812 (e.g. when running oldconfig). It selects
813 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
815 config NETFILTER_XT_TARGET_CONNSECMARK
816 tristate '"CONNSECMARK" target support'
817 depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
818 default m if NETFILTER_ADVANCED=n
820 The CONNSECMARK target copies security markings from packets
821 to connections, and restores security markings from connections
822 to packets (if the packets are not already marked). This would
823 normally be used in conjunction with the SECMARK target.
825 To compile it as a module, choose M here. If unsure, say N.
827 config NETFILTER_XT_TARGET_CT
828 tristate '"CT" target support'
829 depends on NF_CONNTRACK
830 depends on IP_NF_RAW || IP6_NF_RAW
831 depends on NETFILTER_ADVANCED
833 This options adds a `CT' target, which allows to specify initial
834 connection tracking parameters like events to be delivered and
835 the helper to be used.
837 To compile it as a module, choose M here. If unsure, say N.
839 config NETFILTER_XT_TARGET_DSCP
840 tristate '"DSCP" and "TOS" target support'
841 depends on IP_NF_MANGLE || IP6_NF_MANGLE
842 depends on NETFILTER_ADVANCED
844 This option adds a `DSCP' target, which allows you to manipulate
845 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
847 The DSCP field can have any value between 0x0 and 0x3f inclusive.
849 It also adds the "TOS" target, which allows you to create rules in
850 the "mangle" table which alter the Type Of Service field of an IPv4
851 or the Priority field of an IPv6 packet, prior to routing.
853 To compile it as a module, choose M here. If unsure, say N.
855 config NETFILTER_XT_TARGET_HL
856 tristate '"HL" hoplimit target support'
857 depends on IP_NF_MANGLE || IP6_NF_MANGLE
858 depends on NETFILTER_ADVANCED
860 This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
861 targets, which enable the user to change the
862 hoplimit/time-to-live value of the IP header.
864 While it is safe to decrement the hoplimit/TTL value, the
865 modules also allow to increment and set the hoplimit value of
866 the header to arbitrary values. This is EXTREMELY DANGEROUS
867 since you can easily create immortal packets that loop
868 forever on the network.
870 config NETFILTER_XT_TARGET_HMARK
871 tristate '"HMARK" target support'
872 depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
873 depends on NETFILTER_ADVANCED
875 This option adds the "HMARK" target.
877 The target allows you to create rules in the "raw" and "mangle" tables
878 which set the skbuff mark by means of hash calculation within a given
879 range. The nfmark can influence the routing method and can also be used
880 by other subsystems to change their behaviour.
882 To compile it as a module, choose M here. If unsure, say N.
884 config NETFILTER_XT_TARGET_IDLETIMER
885 tristate "IDLETIMER target support"
886 depends on NETFILTER_ADVANCED
889 This option adds the `IDLETIMER' target. Each matching packet
890 resets the timer associated with label specified when the rule is
891 added. When the timer expires, it triggers a sysfs notification.
892 The remaining time for expiration can be read via sysfs.
894 To compile it as a module, choose M here. If unsure, say N.
896 config NETFILTER_XT_TARGET_LED
897 tristate '"LED" target support'
898 depends on LEDS_CLASS && LEDS_TRIGGERS
899 depends on NETFILTER_ADVANCED
901 This option adds a `LED' target, which allows you to blink LEDs in
902 response to particular packets passing through your machine.
904 This can be used to turn a spare LED into a network activity LED,
905 which only flashes in response to FTP transfers, for example. Or
906 you could have an LED which lights up for a minute or two every time
907 somebody connects to your machine via SSH.
909 You will need support for the "led" class to make this work.
911 To create an LED trigger for incoming SSH traffic:
912 iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
914 Then attach the new trigger to an LED on your system:
915 echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
917 For more information on the LEDs available on your system, see
918 Documentation/leds/leds-class.rst
920 config NETFILTER_XT_TARGET_LOG
921 tristate "LOG target support"
924 select NF_LOG_IPV6 if IP6_NF_IPTABLES
925 default m if NETFILTER_ADVANCED=n
927 This option adds a `LOG' target, which allows you to create rules in
928 any iptables table which records the packet header to the syslog.
930 To compile it as a module, choose M here. If unsure, say N.
932 config NETFILTER_XT_TARGET_MARK
933 tristate '"MARK" target support'
934 depends on NETFILTER_ADVANCED
935 select NETFILTER_XT_MARK
937 This is a backwards-compat option for the user's convenience
938 (e.g. when running oldconfig). It selects
939 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
941 config NETFILTER_XT_NAT
942 tristate '"SNAT and DNAT" targets support'
945 This option enables the SNAT and DNAT targets.
947 To compile it as a module, choose M here. If unsure, say N.
949 config NETFILTER_XT_TARGET_NETMAP
950 tristate '"NETMAP" target support'
953 NETMAP is an implementation of static 1:1 NAT mapping of network
954 addresses. It maps the network address part, while keeping the host
957 To compile it as a module, choose M here. If unsure, say N.
959 config NETFILTER_XT_TARGET_NFLOG
960 tristate '"NFLOG" target support'
961 default m if NETFILTER_ADVANCED=n
962 select NETFILTER_NETLINK_LOG
964 This option enables the NFLOG target, which allows to LOG
965 messages through nfnetlink_log.
967 To compile it as a module, choose M here. If unsure, say N.
969 config NETFILTER_XT_TARGET_NFQUEUE
970 tristate '"NFQUEUE" target Support'
971 depends on NETFILTER_ADVANCED
972 select NETFILTER_NETLINK_QUEUE
974 This target replaced the old obsolete QUEUE target.
976 As opposed to QUEUE, it supports 65535 different queues,
979 To compile it as a module, choose M here. If unsure, say N.
981 config NETFILTER_XT_TARGET_NOTRACK
982 tristate '"NOTRACK" target support (DEPRECATED)'
983 depends on NF_CONNTRACK
984 depends on IP_NF_RAW || IP6_NF_RAW
985 depends on NETFILTER_ADVANCED
986 select NETFILTER_XT_TARGET_CT
988 config NETFILTER_XT_TARGET_RATEEST
989 tristate '"RATEEST" target support'
990 depends on NETFILTER_ADVANCED
992 This option adds a `RATEEST' target, which allows to measure
993 rates similar to TC estimators. The `rateest' match can be
994 used to match on the measured rates.
996 To compile it as a module, choose M here. If unsure, say N.
998 config NETFILTER_XT_TARGET_REDIRECT
999 tristate "REDIRECT target support"
1001 select NF_NAT_REDIRECT
1003 REDIRECT is a special case of NAT: all incoming connections are
1004 mapped onto the incoming interface's address, causing the packets to
1005 come to the local machine instead of passing through. This is
1006 useful for transparent proxies.
1008 To compile it as a module, choose M here. If unsure, say N.
1010 config NETFILTER_XT_TARGET_MASQUERADE
1011 tristate "MASQUERADE target support"
1013 default m if NETFILTER_ADVANCED=n
1014 select NF_NAT_MASQUERADE
1016 Masquerading is a special case of NAT: all outgoing connections are
1017 changed to seem to come from a particular interface's address, and
1018 if the interface goes down, those connections are lost. This is
1019 only useful for dialup accounts with dynamic IP address (ie. your IP
1020 address will be different on next dialup).
1022 To compile it as a module, choose M here. If unsure, say N.
1024 config NETFILTER_XT_TARGET_TEE
1025 tristate '"TEE" - packet cloning to alternate destination'
1026 depends on NETFILTER_ADVANCED
1027 depends on IPV6 || IPV6=n
1028 depends on !NF_CONNTRACK || NF_CONNTRACK
1029 depends on IP6_NF_IPTABLES || !IP6_NF_IPTABLES
1031 select NF_DUP_IPV6 if IP6_NF_IPTABLES
1033 This option adds a "TEE" target with which a packet can be cloned and
1034 this clone be rerouted to another nexthop.
1036 config NETFILTER_XT_TARGET_TPROXY
1037 tristate '"TPROXY" target transparent proxying support'
1038 depends on NETFILTER_XTABLES
1039 depends on NETFILTER_ADVANCED
1040 depends on IPV6 || IPV6=n
1041 depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
1042 depends on IP_NF_MANGLE
1043 select NF_DEFRAG_IPV4
1044 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES != n
1045 select NF_TPROXY_IPV4
1046 select NF_TPROXY_IPV6 if IP6_NF_IPTABLES
1048 This option adds a `TPROXY' target, which is somewhat similar to
1049 REDIRECT. It can only be used in the mangle table and is useful
1050 to redirect traffic to a transparent proxy. It does _not_ depend
1051 on Netfilter connection tracking and NAT, unlike REDIRECT.
1052 For it to work you will have to configure certain iptables rules
1053 and use policy routing. For more information on how to set it up
1054 see Documentation/networking/tproxy.txt.
1056 To compile it as a module, choose M here. If unsure, say N.
1058 config NETFILTER_XT_TARGET_TRACE
1059 tristate '"TRACE" target support'
1060 depends on IP_NF_RAW || IP6_NF_RAW
1061 depends on NETFILTER_ADVANCED
1063 The TRACE target allows you to mark packets so that the kernel
1064 will log every rule which match the packets as those traverse
1065 the tables, chains, rules.
1067 If you want to compile it as a module, say M here and read
1068 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
1070 config NETFILTER_XT_TARGET_SECMARK
1071 tristate '"SECMARK" target support'
1072 depends on NETWORK_SECMARK
1073 default m if NETFILTER_ADVANCED=n
1075 The SECMARK target allows security marking of network
1076 packets, for use with security subsystems.
1078 To compile it as a module, choose M here. If unsure, say N.
1080 config NETFILTER_XT_TARGET_TCPMSS
1081 tristate '"TCPMSS" target support'
1082 depends on IPV6 || IPV6=n
1083 default m if NETFILTER_ADVANCED=n
1085 This option adds a `TCPMSS' target, which allows you to alter the
1086 MSS value of TCP SYN packets, to control the maximum size for that
1087 connection (usually limiting it to your outgoing interface's MTU
1090 This is used to overcome criminally braindead ISPs or servers which
1091 block ICMP Fragmentation Needed packets. The symptoms of this
1092 problem are that everything works fine from your Linux
1093 firewall/router, but machines behind it can never exchange large
1095 1) Web browsers connect, then hang with no data received.
1096 2) Small mail works fine, but large emails hang.
1097 3) ssh works fine, but scp hangs after initial handshaking.
1099 Workaround: activate this option and add a rule to your firewall
1102 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
1103 -j TCPMSS --clamp-mss-to-pmtu
1105 To compile it as a module, choose M here. If unsure, say N.
1107 config NETFILTER_XT_TARGET_TCPOPTSTRIP
1108 tristate '"TCPOPTSTRIP" target support'
1109 depends on IP_NF_MANGLE || IP6_NF_MANGLE
1110 depends on NETFILTER_ADVANCED
1112 This option adds a "TCPOPTSTRIP" target, which allows you to strip
1113 TCP options from TCP packets.
1115 # alphabetically ordered list of matches
1117 comment "Xtables matches"
1119 config NETFILTER_XT_MATCH_ADDRTYPE
1120 tristate '"addrtype" address type match support'
1121 default m if NETFILTER_ADVANCED=n
1123 This option allows you to match what routing thinks of an address,
1124 eg. UNICAST, LOCAL, BROADCAST, ...
1126 If you want to compile it as a module, say M here and read
1127 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
1129 config NETFILTER_XT_MATCH_BPF
1130 tristate '"bpf" match support'
1131 depends on NETFILTER_ADVANCED
1133 BPF matching applies a linux socket filter to each packet and
1134 accepts those for which the filter returns non-zero.
1136 To compile it as a module, choose M here. If unsure, say N.
1138 config NETFILTER_XT_MATCH_CGROUP
1139 tristate '"control group" match support'
1140 depends on NETFILTER_ADVANCED
1142 select CGROUP_NET_CLASSID
1144 Socket/process control group matching allows you to match locally
1145 generated packets based on which net_cls control group processes
1148 config NETFILTER_XT_MATCH_CLUSTER
1149 tristate '"cluster" match support'
1150 depends on NF_CONNTRACK
1151 depends on NETFILTER_ADVANCED
1153 This option allows you to build work-load-sharing clusters of
1154 network servers/stateful firewalls without having a dedicated
1155 load-balancing router/server/switch. Basically, this match returns
1156 true when the packet must be handled by this cluster node. Thus,
1157 all nodes see all packets and this match decides which node handles
1158 what packets. The work-load sharing algorithm is based on source
1161 If you say Y or M here, try `iptables -m cluster --help` for
1164 config NETFILTER_XT_MATCH_COMMENT
1165 tristate '"comment" match support'
1166 depends on NETFILTER_ADVANCED
1168 This option adds a `comment' dummy-match, which allows you to put
1169 comments in your iptables ruleset.
1171 If you want to compile it as a module, say M here and read
1172 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
1174 config NETFILTER_XT_MATCH_CONNBYTES
1175 tristate '"connbytes" per-connection counter match support'
1176 depends on NF_CONNTRACK
1177 depends on NETFILTER_ADVANCED
1179 This option adds a `connbytes' match, which allows you to match the
1180 number of bytes and/or packets for each direction within a connection.
1182 If you want to compile it as a module, say M here and read
1183 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
1185 config NETFILTER_XT_MATCH_CONNLABEL
1186 tristate '"connlabel" match support'
1187 select NF_CONNTRACK_LABELS
1188 depends on NF_CONNTRACK
1189 depends on NETFILTER_ADVANCED
1191 This match allows you to test and assign userspace-defined labels names
1192 to a connection. The kernel only stores bit values - mapping
1193 names to bits is done by userspace.
1195 Unlike connmark, more than 32 flag bits may be assigned to a
1196 connection simultaneously.
1198 config NETFILTER_XT_MATCH_CONNLIMIT
1199 tristate '"connlimit" match support'
1200 depends on NF_CONNTRACK
1201 depends on NETFILTER_ADVANCED
1202 select NETFILTER_CONNCOUNT
1204 This match allows you to match against the number of parallel
1205 connections to a server per client IP address (or address block).
1207 config NETFILTER_XT_MATCH_CONNMARK
1208 tristate '"connmark" connection mark match support'
1209 depends on NF_CONNTRACK
1210 depends on NETFILTER_ADVANCED
1211 select NETFILTER_XT_CONNMARK
1213 This is a backwards-compat option for the user's convenience
1214 (e.g. when running oldconfig). It selects
1215 CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
1217 config NETFILTER_XT_MATCH_CONNTRACK
1218 tristate '"conntrack" connection tracking match support'
1219 depends on NF_CONNTRACK
1220 default m if NETFILTER_ADVANCED=n
1222 This is a general conntrack match module, a superset of the state match.
1224 It allows matching on additional conntrack information, which is
1225 useful in complex configurations, such as NAT gateways with multiple
1226 internet links or tunnels.
1228 To compile it as a module, choose M here. If unsure, say N.
1230 config NETFILTER_XT_MATCH_CPU
1231 tristate '"cpu" match support'
1232 depends on NETFILTER_ADVANCED
1234 CPU matching allows you to match packets based on the CPU
1235 currently handling the packet.
1237 To compile it as a module, choose M here. If unsure, say N.
1239 config NETFILTER_XT_MATCH_DCCP
1240 tristate '"dccp" protocol match support'
1241 depends on NETFILTER_ADVANCED
1244 With this option enabled, you will be able to use the iptables
1245 `dccp' match in order to match on DCCP source/destination ports
1248 If you want to compile it as a module, say M here and read
1249 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
1251 config NETFILTER_XT_MATCH_DEVGROUP
1252 tristate '"devgroup" match support'
1253 depends on NETFILTER_ADVANCED
1255 This options adds a `devgroup' match, which allows to match on the
1256 device group a network device is assigned to.
1258 To compile it as a module, choose M here. If unsure, say N.
1260 config NETFILTER_XT_MATCH_DSCP
1261 tristate '"dscp" and "tos" match support'
1262 depends on NETFILTER_ADVANCED
1264 This option adds a `DSCP' match, which allows you to match against
1265 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
1267 The DSCP field can have any value between 0x0 and 0x3f inclusive.
1269 It will also add a "tos" match, which allows you to match packets
1270 based on the Type Of Service fields of the IPv4 packet (which share
1271 the same bits as DSCP).
1273 To compile it as a module, choose M here. If unsure, say N.
1275 config NETFILTER_XT_MATCH_ECN
1276 tristate '"ecn" match support'
1277 depends on NETFILTER_ADVANCED
1279 This option adds an "ECN" match, which allows you to match against
1280 the IPv4 and TCP header ECN fields.
1282 To compile it as a module, choose M here. If unsure, say N.
1284 config NETFILTER_XT_MATCH_ESP
1285 tristate '"esp" match support'
1286 depends on NETFILTER_ADVANCED
1288 This match extension allows you to match a range of SPIs
1289 inside ESP header of IPSec packets.
1291 To compile it as a module, choose M here. If unsure, say N.
1293 config NETFILTER_XT_MATCH_HASHLIMIT
1294 tristate '"hashlimit" match support'
1295 depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
1296 depends on NETFILTER_ADVANCED
1298 This option adds a `hashlimit' match.
1300 As opposed to `limit', this match dynamically creates a hash table
1301 of limit buckets, based on your selection of source/destination
1302 addresses and/or ports.
1304 It enables you to express policies like `10kpps for any given
1305 destination address' or `500pps from any given source address'
1308 config NETFILTER_XT_MATCH_HELPER
1309 tristate '"helper" match support'
1310 depends on NF_CONNTRACK
1311 depends on NETFILTER_ADVANCED
1313 Helper matching allows you to match packets in dynamic connections
1314 tracked by a conntrack-helper, ie. nf_conntrack_ftp
1316 To compile it as a module, choose M here. If unsure, say Y.
1318 config NETFILTER_XT_MATCH_HL
1319 tristate '"hl" hoplimit/TTL match support'
1320 depends on NETFILTER_ADVANCED
1322 HL matching allows you to match packets based on the hoplimit
1323 in the IPv6 header, or the time-to-live field in the IPv4
1324 header of the packet.
1326 config NETFILTER_XT_MATCH_IPCOMP
1327 tristate '"ipcomp" match support'
1328 depends on NETFILTER_ADVANCED
1330 This match extension allows you to match a range of CPIs(16 bits)
1331 inside IPComp header of IPSec packets.
1333 To compile it as a module, choose M here. If unsure, say N.
1335 config NETFILTER_XT_MATCH_IPRANGE
1336 tristate '"iprange" address range match support'
1337 depends on NETFILTER_ADVANCED
1339 This option adds a "iprange" match, which allows you to match based on
1340 an IP address range. (Normal iptables only matches on single addresses
1341 with an optional mask.)
1345 config NETFILTER_XT_MATCH_IPVS
1346 tristate '"ipvs" match support'
1348 depends on NETFILTER_ADVANCED
1349 depends on NF_CONNTRACK
1351 This option allows you to match against IPVS properties of a packet.
1355 config NETFILTER_XT_MATCH_L2TP
1356 tristate '"l2tp" match support'
1357 depends on NETFILTER_ADVANCED
1360 This option adds an "L2TP" match, which allows you to match against
1361 L2TP protocol header fields.
1363 To compile it as a module, choose M here. If unsure, say N.
1365 config NETFILTER_XT_MATCH_LENGTH
1366 tristate '"length" match support'
1367 depends on NETFILTER_ADVANCED
1369 This option allows you to match the length of a packet against a
1370 specific value or range of values.
1372 To compile it as a module, choose M here. If unsure, say N.
1374 config NETFILTER_XT_MATCH_LIMIT
1375 tristate '"limit" match support'
1376 depends on NETFILTER_ADVANCED
1378 limit matching allows you to control the rate at which a rule can be
1379 matched: mainly useful in combination with the LOG target ("LOG
1380 target support", below) and to avoid some Denial of Service attacks.
1382 To compile it as a module, choose M here. If unsure, say N.
1384 config NETFILTER_XT_MATCH_MAC
1385 tristate '"mac" address match support'
1386 depends on NETFILTER_ADVANCED
1388 MAC matching allows you to match packets based on the source
1389 Ethernet address of the packet.
1391 To compile it as a module, choose M here. If unsure, say N.
1393 config NETFILTER_XT_MATCH_MARK
1394 tristate '"mark" match support'
1395 depends on NETFILTER_ADVANCED
1396 select NETFILTER_XT_MARK
1398 This is a backwards-compat option for the user's convenience
1399 (e.g. when running oldconfig). It selects
1400 CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
1402 config NETFILTER_XT_MATCH_MULTIPORT
1403 tristate '"multiport" Multiple port match support'
1404 depends on NETFILTER_ADVANCED
1406 Multiport matching allows you to match TCP or UDP packets based on
1407 a series of source or destination ports: normally a rule can only
1408 match a single range of ports.
1410 To compile it as a module, choose M here. If unsure, say N.
1412 config NETFILTER_XT_MATCH_NFACCT
1413 tristate '"nfacct" match support'
1414 depends on NETFILTER_ADVANCED
1415 select NETFILTER_NETLINK_ACCT
1417 This option allows you to use the extended accounting through
1420 To compile it as a module, choose M here. If unsure, say N.
1422 config NETFILTER_XT_MATCH_OSF
1423 tristate '"osf" Passive OS fingerprint match'
1424 depends on NETFILTER_ADVANCED
1425 select NETFILTER_NETLINK_OSF
1427 This option selects the Passive OS Fingerprinting match module
1428 that allows to passively match the remote operating system by
1429 analyzing incoming TCP SYN packets.
1431 Rules and loading software can be downloaded from
1432 http://www.ioremap.net/projects/osf
1434 To compile it as a module, choose M here. If unsure, say N.
1436 config NETFILTER_XT_MATCH_OWNER
1437 tristate '"owner" match support'
1438 depends on NETFILTER_ADVANCED
1440 Socket owner matching allows you to match locally-generated packets
1441 based on who created the socket: the user or group. It is also
1442 possible to check whether a socket actually exists.
1444 config NETFILTER_XT_MATCH_POLICY
1445 tristate 'IPsec "policy" match support'
1447 default m if NETFILTER_ADVANCED=n
1449 Policy matching allows you to match packets based on the
1450 IPsec policy that was used during decapsulation/will
1451 be used during encapsulation.
1453 To compile it as a module, choose M here. If unsure, say N.
1455 config NETFILTER_XT_MATCH_PHYSDEV
1456 tristate '"physdev" match support'
1457 depends on BRIDGE && BRIDGE_NETFILTER
1458 depends on NETFILTER_ADVANCED
1460 Physdev packet matching matches against the physical bridge ports
1461 the IP packet arrived on or will leave by.
1463 To compile it as a module, choose M here. If unsure, say N.
1465 config NETFILTER_XT_MATCH_PKTTYPE
1466 tristate '"pkttype" packet type match support'
1467 depends on NETFILTER_ADVANCED
1469 Packet type matching allows you to match a packet by
1470 its "class", eg. BROADCAST, MULTICAST, ...
1473 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
1475 To compile it as a module, choose M here. If unsure, say N.
1477 config NETFILTER_XT_MATCH_QUOTA
1478 tristate '"quota" match support'
1479 depends on NETFILTER_ADVANCED
1481 This option adds a `quota' match, which allows to match on a
1484 If you want to compile it as a module, say M here and read
1485 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
1487 config NETFILTER_XT_MATCH_RATEEST
1488 tristate '"rateest" match support'
1489 depends on NETFILTER_ADVANCED
1490 select NETFILTER_XT_TARGET_RATEEST
1492 This option adds a `rateest' match, which allows to match on the
1493 rate estimated by the RATEEST target.
1495 To compile it as a module, choose M here. If unsure, say N.
1497 config NETFILTER_XT_MATCH_REALM
1498 tristate '"realm" match support'
1499 depends on NETFILTER_ADVANCED
1500 select IP_ROUTE_CLASSID
1502 This option adds a `realm' match, which allows you to use the realm
1503 key from the routing subsystem inside iptables.
1505 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
1508 If you want to compile it as a module, say M here and read
1509 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
1511 config NETFILTER_XT_MATCH_RECENT
1512 tristate '"recent" match support'
1513 depends on NETFILTER_ADVANCED
1515 This match is used for creating one or many lists of recently
1516 used addresses and then matching against that/those list(s).
1518 Short options are available by using 'iptables -m recent -h'
1519 Official Website: <http://snowman.net/projects/ipt_recent/>
1521 config NETFILTER_XT_MATCH_SCTP
1522 tristate '"sctp" protocol match support'
1523 depends on NETFILTER_ADVANCED
1526 With this option enabled, you will be able to use the
1527 `sctp' match in order to match on SCTP source/destination ports
1528 and SCTP chunk types.
1530 If you want to compile it as a module, say M here and read
1531 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
1533 config NETFILTER_XT_MATCH_SOCKET
1534 tristate '"socket" match support'
1535 depends on NETFILTER_XTABLES
1536 depends on NETFILTER_ADVANCED
1537 depends on IPV6 || IPV6=n
1538 depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
1539 select NF_SOCKET_IPV4
1540 select NF_SOCKET_IPV6 if IP6_NF_IPTABLES
1541 select NF_DEFRAG_IPV4
1542 select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES != n
1544 This option adds a `socket' match, which can be used to match
1545 packets for which a TCP or UDP socket lookup finds a valid socket.
1546 It can be used in combination with the MARK target and policy
1547 routing to implement full featured non-locally bound sockets.
1549 To compile it as a module, choose M here. If unsure, say N.
1551 config NETFILTER_XT_MATCH_STATE
1552 tristate '"state" match support'
1553 depends on NF_CONNTRACK
1554 default m if NETFILTER_ADVANCED=n
1556 Connection state matching allows you to match packets based on their
1557 relationship to a tracked connection (ie. previous packets). This
1558 is a powerful tool for packet classification.
1560 To compile it as a module, choose M here. If unsure, say N.
1562 config NETFILTER_XT_MATCH_STATISTIC
1563 tristate '"statistic" match support'
1564 depends on NETFILTER_ADVANCED
1566 This option adds a `statistic' match, which allows you to match
1567 on packets periodically or randomly with a given percentage.
1569 To compile it as a module, choose M here. If unsure, say N.
1571 config NETFILTER_XT_MATCH_STRING
1572 tristate '"string" match support'
1573 depends on NETFILTER_ADVANCED
1575 select TEXTSEARCH_KMP
1576 select TEXTSEARCH_BM
1577 select TEXTSEARCH_FSM
1579 This option adds a `string' match, which allows you to look for
1580 pattern matchings in packets.
1582 To compile it as a module, choose M here. If unsure, say N.
1584 config NETFILTER_XT_MATCH_TCPMSS
1585 tristate '"tcpmss" match support'
1586 depends on NETFILTER_ADVANCED
1588 This option adds a `tcpmss' match, which allows you to examine the
1589 MSS value of TCP SYN packets, which control the maximum packet size
1590 for that connection.
1592 To compile it as a module, choose M here. If unsure, say N.
1594 config NETFILTER_XT_MATCH_TIME
1595 tristate '"time" match support'
1596 depends on NETFILTER_ADVANCED
1598 This option adds a "time" match, which allows you to match based on
1599 the packet arrival time (at the machine which netfilter is running)
1600 on) or departure time/date (for locally generated packets).
1602 If you say Y here, try `iptables -m time --help` for
1605 If you want to compile it as a module, say M here.
1608 config NETFILTER_XT_MATCH_U32
1609 tristate '"u32" match support'
1610 depends on NETFILTER_ADVANCED
1612 u32 allows you to extract quantities of up to 4 bytes from a packet,
1613 AND them with specified masks, shift them by specified amounts and
1614 test whether the results are in any of a set of specified ranges.
1615 The specification of what to extract is general enough to skip over
1616 headers with lengths stored in the packet, as in IP or TCP header
1619 Details and examples are in the kernel module source.
1621 endif # NETFILTER_XTABLES
1625 source "net/netfilter/ipset/Kconfig"
1627 source "net/netfilter/ipvs/Kconfig"