1 menu "Core Netfilter Configuration"
2 depends on NET && INET && NETFILTER
4 config NETFILTER_NETLINK
5 tristate "Netfilter netlink interface"
7 If this option is enabled, the kernel will include support
8 for the new netfilter netlink interface.
10 config NETFILTER_NETLINK_QUEUE
11 tristate "Netfilter NFQUEUE over NFNETLINK interface"
12 depends on NETFILTER_NETLINK
14 If this option is enabled, the kernel will include support
15 for queueing packets via NFNETLINK.
17 config NETFILTER_NETLINK_LOG
18 tristate "Netfilter LOG over NFNETLINK interface"
19 depends on NETFILTER_NETLINK
21 If this option is enabled, the kernel will include support
22 for logging packets via NFNETLINK.
24 This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
25 and is also scheduled to replace the old syslog-based ipt_LOG
28 config NF_CONNTRACK_ENABLED
29 tristate "Netfilter connection tracking support"
31 Connection tracking keeps a record of what packets have passed
32 through your machine, in order to figure out how they are related
35 This is required to do Masquerading or other kinds of Network
36 Address Translation (except for Fast NAT). It can also be used to
37 enhance packet filtering (see `Connection state match support'
40 To compile it as a module, choose M here. If unsure, say N.
43 prompt "Netfilter connection tracking support"
44 depends on NF_CONNTRACK_ENABLED
46 config NF_CONNTRACK_SUPPORT
47 bool "Layer 3 Independent Connection tracking"
49 Layer 3 independent connection tracking is experimental scheme
50 which generalize ip_conntrack to support other layer 3 protocols.
52 This is required to do Masquerading or other kinds of Network
53 Address Translation (except for Fast NAT). It can also be used to
54 enhance packet filtering (see `Connection state match support'
57 config IP_NF_CONNTRACK_SUPPORT
58 bool "Layer 3 Dependent Connection tracking (OBSOLETE)"
60 The old, Layer 3 dependent ip_conntrack subsystem of netfilter.
62 This is required to do Masquerading or other kinds of Network
63 Address Translation (except for Fast NAT). It can also be used to
64 enhance packet filtering (see `Connection state match support'
71 default m if NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=m
72 default y if NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=y
74 config IP_NF_CONNTRACK
76 default m if IP_NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=m
77 default y if IP_NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=y
80 bool "Connection tracking flow accounting"
81 depends on NF_CONNTRACK
83 If this option is enabled, the connection tracking code will
84 keep per-flow packet and byte counters.
86 Those counters can be used for flow-based accounting or the
91 config NF_CONNTRACK_MARK
92 bool 'Connection mark tracking support'
93 depends on NF_CONNTRACK
95 This option enables support for connection marks, used by the
96 `CONNMARK' target and `connmark' match. Similar to the mark value
97 of packets, but this mark value is kept in the conntrack session
98 instead of the individual packets.
100 config NF_CONNTRACK_SECMARK
101 bool 'Connection tracking security mark support'
102 depends on NF_CONNTRACK && NETWORK_SECMARK
104 This option enables security markings to be applied to
105 connections. Typically they are copied to connections from
106 packets using the CONNSECMARK target and copied back from
107 connections to packets with the same target, with the packets
108 being originally labeled via SECMARK.
112 config NF_CONNTRACK_EVENTS
113 bool "Connection tracking events (EXPERIMENTAL)"
114 depends on EXPERIMENTAL && NF_CONNTRACK
116 If this option is enabled, the connection tracking code will
117 provide a notifier chain that can be used by other kernel code
118 to get notified about changes in the connection tracking state.
122 config NF_CT_PROTO_GRE
124 depends on NF_CONNTRACK
126 config NF_CT_PROTO_SCTP
127 tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
128 depends on EXPERIMENTAL && NF_CONNTRACK
131 With this option enabled, the layer 3 independent connection
132 tracking code will be able to do state tracking on SCTP connections.
134 If you want to compile it as a module, say M here and read
135 Documentation/modules.txt. If unsure, say `N'.
137 config NF_CONNTRACK_AMANDA
138 tristate "Amanda backup protocol support"
139 depends on NF_CONNTRACK
141 select TEXTSEARCH_KMP
143 If you are running the Amanda backup package <http://www.amanda.org/>
144 on this machine or machines that will be MASQUERADED through this
145 machine, then you may want to enable this feature. This allows the
146 connection tracking and natting code to allow the sub-channels that
147 Amanda requires for communication of the backup data, messages and
150 To compile it as a module, choose M here. If unsure, say N.
152 config NF_CONNTRACK_FTP
153 tristate "FTP protocol support"
154 depends on NF_CONNTRACK
156 Tracking FTP connections is problematic: special helpers are
157 required for tracking them, and doing masquerading and other forms
158 of Network Address Translation on them.
160 This is FTP support on Layer 3 independent connection tracking.
161 Layer 3 independent connection tracking is experimental scheme
162 which generalize ip_conntrack to support other layer 3 protocols.
164 To compile it as a module, choose M here. If unsure, say N.
166 config NF_CONNTRACK_H323
167 tristate "H.323 protocol support (EXPERIMENTAL)"
168 depends on EXPERIMENTAL && NF_CONNTRACK && (IPV6 || IPV6=n)
170 H.323 is a VoIP signalling protocol from ITU-T. As one of the most
171 important VoIP protocols, it is widely used by voice hardware and
172 software including voice gateways, IP phones, Netmeeting, OpenPhone,
175 With this module you can support H.323 on a connection tracking/NAT
178 This module supports RAS, Fast Start, H.245 Tunnelling, Call
179 Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
180 whiteboard, file transfer, etc. For more information, please
181 visit http://nath323.sourceforge.net/.
183 To compile it as a module, choose M here. If unsure, say N.
185 config NF_CONNTRACK_IRC
186 tristate "IRC protocol support"
187 depends on NF_CONNTRACK
189 There is a commonly-used extension to IRC called
190 Direct Client-to-Client Protocol (DCC). This enables users to send
191 files to each other, and also chat to each other without the need
192 of a server. DCC Sending is used anywhere you send files over IRC,
193 and DCC Chat is most commonly used by Eggdrop bots. If you are
194 using NAT, this extension will enable you to send files and initiate
195 chats. Note that you do NOT need this extension to get files or
196 have others initiate chats, or everything else in IRC.
198 To compile it as a module, choose M here. If unsure, say N.
200 config NF_CONNTRACK_NETBIOS_NS
201 tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
202 depends on EXPERIMENTAL && NF_CONNTRACK
204 NetBIOS name service requests are sent as broadcast messages from an
205 unprivileged port and responded to with unicast messages to the
206 same port. This make them hard to firewall properly because connection
207 tracking doesn't deal with broadcasts. This helper tracks locally
208 originating NetBIOS name service requests and the corresponding
209 responses. It relies on correct IP address configuration, specifically
210 netmask and broadcast address. When properly configured, the output
211 of "ip address show" should look similar to this:
213 $ ip -4 address show eth0
214 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
215 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
217 To compile it as a module, choose M here. If unsure, say N.
219 config NF_CONNTRACK_PPTP
220 tristate "PPtP protocol support"
221 depends on NF_CONNTRACK
222 select NF_CT_PROTO_GRE
224 This module adds support for PPTP (Point to Point Tunnelling
225 Protocol, RFC2637) connection tracking and NAT.
227 If you are running PPTP sessions over a stateful firewall or NAT
228 box, you may want to enable this feature.
230 Please note that not all PPTP modes of operation are supported yet.
231 Specifically these limitations exist:
232 - Blindy assumes that control connections are always established
233 in PNS->PAC direction. This is a violation of RFC2637.
234 - Only supports a single call within each session
236 To compile it as a module, choose M here. If unsure, say N.
238 config NF_CONNTRACK_SANE
239 tristate "SANE protocol support (EXPERIMENTAL)"
240 depends on EXPERIMENTAL && NF_CONNTRACK
242 SANE is a protocol for remote access to scanners as implemented
243 by the 'saned' daemon. Like FTP, it uses separate control and
246 With this module you can support SANE on a connection tracking
249 To compile it as a module, choose M here. If unsure, say N.
251 config NF_CONNTRACK_SIP
252 tristate "SIP protocol support (EXPERIMENTAL)"
253 depends on EXPERIMENTAL && NF_CONNTRACK
255 SIP is an application-layer control protocol that can establish,
256 modify, and terminate multimedia sessions (conferences) such as
257 Internet telephony calls. With the ip_conntrack_sip and
258 the nf_nat_sip modules you can support the protocol on a connection
259 tracking/NATing firewall.
261 To compile it as a module, choose M here. If unsure, say N.
263 config NF_CONNTRACK_TFTP
264 tristate "TFTP protocol support"
265 depends on NF_CONNTRACK
267 TFTP connection tracking helper, this is required depending
268 on how restrictive your ruleset is.
269 If you are using a tftp client behind -j SNAT or -j MASQUERADING
272 To compile it as a module, choose M here. If unsure, say N.
275 tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
276 depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
277 depends on NF_CONNTRACK!=y || NETFILTER_NETLINK!=m
278 depends on NF_NAT=n || NF_NAT
280 This option enables support for a netlink-based userspace interface
282 config NETFILTER_XTABLES
283 tristate "Netfilter Xtables support (required for ip_tables)"
285 This is required if you intend to use any of ip_tables,
286 ip6_tables or arp_tables.
288 # alphabetically ordered list of targets
290 config NETFILTER_XT_TARGET_CLASSIFY
291 tristate '"CLASSIFY" target support'
292 depends on NETFILTER_XTABLES
294 This option adds a `CLASSIFY' target, which enables the user to set
295 the priority of a packet. Some qdiscs can use this value for
296 classification, among these are:
298 atm, cbq, dsmark, pfifo_fast, htb, prio
300 To compile it as a module, choose M here. If unsure, say N.
302 config NETFILTER_XT_TARGET_CONNMARK
303 tristate '"CONNMARK" target support'
304 depends on NETFILTER_XTABLES
305 depends on IP_NF_MANGLE || IP6_NF_MANGLE
306 depends on IP_NF_CONNTRACK || NF_CONNTRACK
307 select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
308 select NF_CONNTRACK_MARK if NF_CONNTRACK
310 This option adds a `CONNMARK' target, which allows one to manipulate
311 the connection mark value. Similar to the MARK target, but
312 affects the connection mark value rather than the packet mark value.
314 If you want to compile it as a module, say M here and read
315 <file:Documentation/modules.txt>. The module will be called
316 ipt_CONNMARK.o. If unsure, say `N'.
318 config NETFILTER_XT_TARGET_DSCP
319 tristate '"DSCP" target support'
320 depends on NETFILTER_XTABLES
321 depends on IP_NF_MANGLE || IP6_NF_MANGLE
323 This option adds a `DSCP' target, which allows you to manipulate
324 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
326 The DSCP field can have any value between 0x0 and 0x3f inclusive.
328 To compile it as a module, choose M here. If unsure, say N.
330 config NETFILTER_XT_TARGET_MARK
331 tristate '"MARK" target support'
332 depends on NETFILTER_XTABLES
334 This option adds a `MARK' target, which allows you to create rules
335 in the `mangle' table which alter the netfilter mark (nfmark) field
336 associated with the packet prior to routing. This can change
337 the routing method (see `Use netfilter MARK value as routing
338 key') and can also be used by other subsystems to change their
341 To compile it as a module, choose M here. If unsure, say N.
343 config NETFILTER_XT_TARGET_NFQUEUE
344 tristate '"NFQUEUE" target Support'
345 depends on NETFILTER_XTABLES
347 This target replaced the old obsolete QUEUE target.
349 As opposed to QUEUE, it supports 65535 different queues,
352 To compile it as a module, choose M here. If unsure, say N.
354 config NETFILTER_XT_TARGET_NFLOG
355 tristate '"NFLOG" target support'
356 depends on NETFILTER_XTABLES
358 This option enables the NFLOG target, which allows to LOG
359 messages through the netfilter logging API, which can use
360 either the old LOG target, the old ULOG target or nfnetlink_log
363 To compile it as a module, choose M here. If unsure, say N.
365 config NETFILTER_XT_TARGET_NOTRACK
366 tristate '"NOTRACK" target support'
367 depends on NETFILTER_XTABLES
368 depends on IP_NF_RAW || IP6_NF_RAW
369 depends on IP_NF_CONNTRACK || NF_CONNTRACK
371 The NOTRACK target allows a select rule to specify
372 which packets *not* to enter the conntrack/NAT
373 subsystem with all the consequences (no ICMP error tracking,
374 no protocol helpers for the selected packets).
376 If you want to compile it as a module, say M here and read
377 <file:Documentation/modules.txt>. If unsure, say `N'.
379 config NETFILTER_XT_TARGET_SECMARK
380 tristate '"SECMARK" target support'
381 depends on NETFILTER_XTABLES && NETWORK_SECMARK
383 The SECMARK target allows security marking of network
384 packets, for use with security subsystems.
386 To compile it as a module, choose M here. If unsure, say N.
388 config NETFILTER_XT_TARGET_CONNSECMARK
389 tristate '"CONNSECMARK" target support'
390 depends on NETFILTER_XTABLES && \
391 ((NF_CONNTRACK && NF_CONNTRACK_SECMARK) || \
392 (IP_NF_CONNTRACK && IP_NF_CONNTRACK_SECMARK))
394 The CONNSECMARK target copies security markings from packets
395 to connections, and restores security markings from connections
396 to packets (if the packets are not already marked). This would
397 normally be used in conjunction with the SECMARK target.
399 To compile it as a module, choose M here. If unsure, say N.
401 config NETFILTER_XT_TARGET_TCPMSS
402 tristate '"TCPMSS" target support'
403 depends on NETFILTER_XTABLES && (IPV6 || IPV6=n)
405 This option adds a `TCPMSS' target, which allows you to alter the
406 MSS value of TCP SYN packets, to control the maximum size for that
407 connection (usually limiting it to your outgoing interface's MTU
410 This is used to overcome criminally braindead ISPs or servers which
411 block ICMP Fragmentation Needed packets. The symptoms of this
412 problem are that everything works fine from your Linux
413 firewall/router, but machines behind it can never exchange large
415 1) Web browsers connect, then hang with no data received.
416 2) Small mail works fine, but large emails hang.
417 3) ssh works fine, but scp hangs after initial handshaking.
419 Workaround: activate this option and add a rule to your firewall
422 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
423 -j TCPMSS --clamp-mss-to-pmtu
425 To compile it as a module, choose M here. If unsure, say N.
427 config NETFILTER_XT_MATCH_COMMENT
428 tristate '"comment" match support'
429 depends on NETFILTER_XTABLES
431 This option adds a `comment' dummy-match, which allows you to put
432 comments in your iptables ruleset.
434 If you want to compile it as a module, say M here and read
435 <file:Documentation/modules.txt>. If unsure, say `N'.
437 config NETFILTER_XT_MATCH_CONNBYTES
438 tristate '"connbytes" per-connection counter match support'
439 depends on NETFILTER_XTABLES
440 depends on IP_NF_CONNTRACK || NF_CONNTRACK
441 select IP_NF_CT_ACCT if IP_NF_CONNTRACK
442 select NF_CT_ACCT if NF_CONNTRACK
444 This option adds a `connbytes' match, which allows you to match the
445 number of bytes and/or packets for each direction within a connection.
447 If you want to compile it as a module, say M here and read
448 <file:Documentation/modules.txt>. If unsure, say `N'.
450 config NETFILTER_XT_MATCH_CONNMARK
451 tristate '"connmark" connection mark match support'
452 depends on NETFILTER_XTABLES
453 depends on IP_NF_CONNTRACK || NF_CONNTRACK
454 select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
455 select NF_CONNTRACK_MARK if NF_CONNTRACK
457 This option adds a `connmark' match, which allows you to match the
458 connection mark value previously set for the session by `CONNMARK'.
460 If you want to compile it as a module, say M here and read
461 <file:Documentation/modules.txt>. The module will be called
462 ipt_connmark.o. If unsure, say `N'.
464 config NETFILTER_XT_MATCH_CONNTRACK
465 tristate '"conntrack" connection tracking match support'
466 depends on NETFILTER_XTABLES
467 depends on IP_NF_CONNTRACK || NF_CONNTRACK
469 This is a general conntrack match module, a superset of the state match.
471 It allows matching on additional conntrack information, which is
472 useful in complex configurations, such as NAT gateways with multiple
473 internet links or tunnels.
475 To compile it as a module, choose M here. If unsure, say N.
477 config NETFILTER_XT_MATCH_DCCP
478 tristate '"DCCP" protocol match support'
479 depends on NETFILTER_XTABLES
481 With this option enabled, you will be able to use the iptables
482 `dccp' match in order to match on DCCP source/destination ports
485 If you want to compile it as a module, say M here and read
486 <file:Documentation/modules.txt>. If unsure, say `N'.
488 config NETFILTER_XT_MATCH_DSCP
489 tristate '"DSCP" match support'
490 depends on NETFILTER_XTABLES
492 This option adds a `DSCP' match, which allows you to match against
493 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
495 The DSCP field can have any value between 0x0 and 0x3f inclusive.
497 To compile it as a module, choose M here. If unsure, say N.
499 config NETFILTER_XT_MATCH_ESP
500 tristate '"ESP" match support'
501 depends on NETFILTER_XTABLES
503 This match extension allows you to match a range of SPIs
504 inside ESP header of IPSec packets.
506 To compile it as a module, choose M here. If unsure, say N.
508 config NETFILTER_XT_MATCH_HELPER
509 tristate '"helper" match support'
510 depends on NETFILTER_XTABLES
511 depends on IP_NF_CONNTRACK || NF_CONNTRACK
513 Helper matching allows you to match packets in dynamic connections
514 tracked by a conntrack-helper, ie. ip_conntrack_ftp
516 To compile it as a module, choose M here. If unsure, say Y.
518 config NETFILTER_XT_MATCH_LENGTH
519 tristate '"length" match support'
520 depends on NETFILTER_XTABLES
522 This option allows you to match the length of a packet against a
523 specific value or range of values.
525 To compile it as a module, choose M here. If unsure, say N.
527 config NETFILTER_XT_MATCH_LIMIT
528 tristate '"limit" match support'
529 depends on NETFILTER_XTABLES
531 limit matching allows you to control the rate at which a rule can be
532 matched: mainly useful in combination with the LOG target ("LOG
533 target support", below) and to avoid some Denial of Service attacks.
535 To compile it as a module, choose M here. If unsure, say N.
537 config NETFILTER_XT_MATCH_MAC
538 tristate '"mac" address match support'
539 depends on NETFILTER_XTABLES
541 MAC matching allows you to match packets based on the source
542 Ethernet address of the packet.
544 To compile it as a module, choose M here. If unsure, say N.
546 config NETFILTER_XT_MATCH_MARK
547 tristate '"mark" match support'
548 depends on NETFILTER_XTABLES
550 Netfilter mark matching allows you to match packets based on the
551 `nfmark' value in the packet. This can be set by the MARK target
554 To compile it as a module, choose M here. If unsure, say N.
556 config NETFILTER_XT_MATCH_POLICY
557 tristate 'IPsec "policy" match support'
558 depends on NETFILTER_XTABLES && XFRM
560 Policy matching allows you to match packets based on the
561 IPsec policy that was used during decapsulation/will
562 be used during encapsulation.
564 To compile it as a module, choose M here. If unsure, say N.
566 config NETFILTER_XT_MATCH_MULTIPORT
567 tristate "Multiple port match support"
568 depends on NETFILTER_XTABLES
570 Multiport matching allows you to match TCP or UDP packets based on
571 a series of source or destination ports: normally a rule can only
572 match a single range of ports.
574 To compile it as a module, choose M here. If unsure, say N.
576 config NETFILTER_XT_MATCH_PHYSDEV
577 tristate '"physdev" match support'
578 depends on NETFILTER_XTABLES && BRIDGE && BRIDGE_NETFILTER
580 Physdev packet matching matches against the physical bridge ports
581 the IP packet arrived on or will leave by.
583 To compile it as a module, choose M here. If unsure, say N.
585 config NETFILTER_XT_MATCH_PKTTYPE
586 tristate '"pkttype" packet type match support'
587 depends on NETFILTER_XTABLES
589 Packet type matching allows you to match a packet by
590 its "class", eg. BROADCAST, MULTICAST, ...
593 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
595 To compile it as a module, choose M here. If unsure, say N.
597 config NETFILTER_XT_MATCH_QUOTA
598 tristate '"quota" match support'
599 depends on NETFILTER_XTABLES
601 This option adds a `quota' match, which allows to match on a
604 If you want to compile it as a module, say M here and read
605 <file:Documentation/modules.txt>. If unsure, say `N'.
607 config NETFILTER_XT_MATCH_REALM
608 tristate '"realm" match support'
609 depends on NETFILTER_XTABLES
612 This option adds a `realm' match, which allows you to use the realm
613 key from the routing subsystem inside iptables.
615 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
618 If you want to compile it as a module, say M here and read
619 <file:Documentation/modules.txt>. If unsure, say `N'.
621 config NETFILTER_XT_MATCH_SCTP
622 tristate '"sctp" protocol match support (EXPERIMENTAL)'
623 depends on NETFILTER_XTABLES && EXPERIMENTAL
625 With this option enabled, you will be able to use the
626 `sctp' match in order to match on SCTP source/destination ports
627 and SCTP chunk types.
629 If you want to compile it as a module, say M here and read
630 <file:Documentation/modules.txt>. If unsure, say `N'.
632 config NETFILTER_XT_MATCH_STATE
633 tristate '"state" match support'
634 depends on NETFILTER_XTABLES
635 depends on IP_NF_CONNTRACK || NF_CONNTRACK
637 Connection state matching allows you to match packets based on their
638 relationship to a tracked connection (ie. previous packets). This
639 is a powerful tool for packet classification.
641 To compile it as a module, choose M here. If unsure, say N.
643 config NETFILTER_XT_MATCH_STATISTIC
644 tristate '"statistic" match support'
645 depends on NETFILTER_XTABLES
647 This option adds a `statistic' match, which allows you to match
648 on packets periodically or randomly with a given percentage.
650 To compile it as a module, choose M here. If unsure, say N.
652 config NETFILTER_XT_MATCH_STRING
653 tristate '"string" match support'
654 depends on NETFILTER_XTABLES
656 select TEXTSEARCH_KMP
658 select TEXTSEARCH_FSM
660 This option adds a `string' match, which allows you to look for
661 pattern matchings in packets.
663 To compile it as a module, choose M here. If unsure, say N.
665 config NETFILTER_XT_MATCH_TCPMSS
666 tristate '"tcpmss" match support'
667 depends on NETFILTER_XTABLES
669 This option adds a `tcpmss' match, which allows you to examine the
670 MSS value of TCP SYN packets, which control the maximum packet size
673 To compile it as a module, choose M here. If unsure, say N.
675 config NETFILTER_XT_MATCH_HASHLIMIT
676 tristate '"hashlimit" match support'
677 depends on NETFILTER_XTABLES && (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
679 This option adds a `hashlimit' match.
681 As opposed to `limit', this match dynamically creates a hash table
682 of limit buckets, based on your selection of source/destination
683 addresses and/or ports.
685 It enables you to express policies like `10kpps for any given
686 destination address' or `500pps from any given source address'