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
279 This option enables support for a netlink-based userspace interface
281 config NETFILTER_XTABLES
282 tristate "Netfilter Xtables support (required for ip_tables)"
284 This is required if you intend to use any of ip_tables,
285 ip6_tables or arp_tables.
287 # alphabetically ordered list of targets
289 config NETFILTER_XT_TARGET_CLASSIFY
290 tristate '"CLASSIFY" target support'
291 depends on NETFILTER_XTABLES
293 This option adds a `CLASSIFY' target, which enables the user to set
294 the priority of a packet. Some qdiscs can use this value for
295 classification, among these are:
297 atm, cbq, dsmark, pfifo_fast, htb, prio
299 To compile it as a module, choose M here. If unsure, say N.
301 config NETFILTER_XT_TARGET_CONNMARK
302 tristate '"CONNMARK" target support'
303 depends on NETFILTER_XTABLES
304 depends on IP_NF_MANGLE || IP6_NF_MANGLE
305 depends on IP_NF_CONNTRACK || NF_CONNTRACK
306 select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
307 select NF_CONNTRACK_MARK if NF_CONNTRACK
309 This option adds a `CONNMARK' target, which allows one to manipulate
310 the connection mark value. Similar to the MARK target, but
311 affects the connection mark value rather than the packet mark value.
313 If you want to compile it as a module, say M here and read
314 <file:Documentation/modules.txt>. The module will be called
315 ipt_CONNMARK.o. If unsure, say `N'.
317 config NETFILTER_XT_TARGET_DSCP
318 tristate '"DSCP" target support'
319 depends on NETFILTER_XTABLES
320 depends on IP_NF_MANGLE || IP6_NF_MANGLE
322 This option adds a `DSCP' target, which allows you to manipulate
323 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
325 The DSCP field can have any value between 0x0 and 0x3f inclusive.
327 To compile it as a module, choose M here. If unsure, say N.
329 config NETFILTER_XT_TARGET_MARK
330 tristate '"MARK" target support'
331 depends on NETFILTER_XTABLES
333 This option adds a `MARK' target, which allows you to create rules
334 in the `mangle' table which alter the netfilter mark (nfmark) field
335 associated with the packet prior to routing. This can change
336 the routing method (see `Use netfilter MARK value as routing
337 key') and can also be used by other subsystems to change their
340 To compile it as a module, choose M here. If unsure, say N.
342 config NETFILTER_XT_TARGET_NFQUEUE
343 tristate '"NFQUEUE" target Support'
344 depends on NETFILTER_XTABLES
346 This target replaced the old obsolete QUEUE target.
348 As opposed to QUEUE, it supports 65535 different queues,
351 To compile it as a module, choose M here. If unsure, say N.
353 config NETFILTER_XT_TARGET_NFLOG
354 tristate '"NFLOG" target support'
355 depends on NETFILTER_XTABLES
357 This option enables the NFLOG target, which allows to LOG
358 messages through the netfilter logging API, which can use
359 either the old LOG target, the old ULOG target or nfnetlink_log
362 To compile it as a module, choose M here. If unsure, say N.
364 config NETFILTER_XT_TARGET_NOTRACK
365 tristate '"NOTRACK" target support'
366 depends on NETFILTER_XTABLES
367 depends on IP_NF_RAW || IP6_NF_RAW
368 depends on IP_NF_CONNTRACK || NF_CONNTRACK
370 The NOTRACK target allows a select rule to specify
371 which packets *not* to enter the conntrack/NAT
372 subsystem with all the consequences (no ICMP error tracking,
373 no protocol helpers for the selected packets).
375 If you want to compile it as a module, say M here and read
376 <file:Documentation/modules.txt>. If unsure, say `N'.
378 config NETFILTER_XT_TARGET_SECMARK
379 tristate '"SECMARK" target support'
380 depends on NETFILTER_XTABLES && NETWORK_SECMARK
382 The SECMARK target allows security marking of network
383 packets, for use with security subsystems.
385 To compile it as a module, choose M here. If unsure, say N.
387 config NETFILTER_XT_TARGET_CONNSECMARK
388 tristate '"CONNSECMARK" target support'
389 depends on NETFILTER_XTABLES && \
390 ((NF_CONNTRACK && NF_CONNTRACK_SECMARK) || \
391 (IP_NF_CONNTRACK && IP_NF_CONNTRACK_SECMARK))
393 The CONNSECMARK target copies security markings from packets
394 to connections, and restores security markings from connections
395 to packets (if the packets are not already marked). This would
396 normally be used in conjunction with the SECMARK target.
398 To compile it as a module, choose M here. If unsure, say N.
400 config NETFILTER_XT_TARGET_TCPMSS
401 tristate '"TCPMSS" target support'
402 depends on NETFILTER_XTABLES && (IPV6 || IPV6=n)
404 This option adds a `TCPMSS' target, which allows you to alter the
405 MSS value of TCP SYN packets, to control the maximum size for that
406 connection (usually limiting it to your outgoing interface's MTU
409 This is used to overcome criminally braindead ISPs or servers which
410 block ICMP Fragmentation Needed packets. The symptoms of this
411 problem are that everything works fine from your Linux
412 firewall/router, but machines behind it can never exchange large
414 1) Web browsers connect, then hang with no data received.
415 2) Small mail works fine, but large emails hang.
416 3) ssh works fine, but scp hangs after initial handshaking.
418 Workaround: activate this option and add a rule to your firewall
421 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
422 -j TCPMSS --clamp-mss-to-pmtu
424 To compile it as a module, choose M here. If unsure, say N.
426 config NETFILTER_XT_MATCH_COMMENT
427 tristate '"comment" match support'
428 depends on NETFILTER_XTABLES
430 This option adds a `comment' dummy-match, which allows you to put
431 comments in your iptables ruleset.
433 If you want to compile it as a module, say M here and read
434 <file:Documentation/modules.txt>. If unsure, say `N'.
436 config NETFILTER_XT_MATCH_CONNBYTES
437 tristate '"connbytes" per-connection counter match support'
438 depends on NETFILTER_XTABLES
439 depends on IP_NF_CONNTRACK || NF_CONNTRACK
440 select IP_NF_CT_ACCT if IP_NF_CONNTRACK
441 select NF_CT_ACCT if NF_CONNTRACK
443 This option adds a `connbytes' match, which allows you to match the
444 number of bytes and/or packets for each direction within a connection.
446 If you want to compile it as a module, say M here and read
447 <file:Documentation/modules.txt>. If unsure, say `N'.
449 config NETFILTER_XT_MATCH_CONNMARK
450 tristate '"connmark" connection mark match support'
451 depends on NETFILTER_XTABLES
452 depends on IP_NF_CONNTRACK || NF_CONNTRACK
453 select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
454 select NF_CONNTRACK_MARK if NF_CONNTRACK
456 This option adds a `connmark' match, which allows you to match the
457 connection mark value previously set for the session by `CONNMARK'.
459 If you want to compile it as a module, say M here and read
460 <file:Documentation/modules.txt>. The module will be called
461 ipt_connmark.o. If unsure, say `N'.
463 config NETFILTER_XT_MATCH_CONNTRACK
464 tristate '"conntrack" connection tracking match support'
465 depends on NETFILTER_XTABLES
466 depends on IP_NF_CONNTRACK || NF_CONNTRACK
468 This is a general conntrack match module, a superset of the state match.
470 It allows matching on additional conntrack information, which is
471 useful in complex configurations, such as NAT gateways with multiple
472 internet links or tunnels.
474 To compile it as a module, choose M here. If unsure, say N.
476 config NETFILTER_XT_MATCH_DCCP
477 tristate '"DCCP" protocol match support'
478 depends on NETFILTER_XTABLES
480 With this option enabled, you will be able to use the iptables
481 `dccp' match in order to match on DCCP source/destination ports
484 If you want to compile it as a module, say M here and read
485 <file:Documentation/modules.txt>. If unsure, say `N'.
487 config NETFILTER_XT_MATCH_DSCP
488 tristate '"DSCP" match support'
489 depends on NETFILTER_XTABLES
491 This option adds a `DSCP' match, which allows you to match against
492 the IPv4/IPv6 header DSCP field (differentiated services codepoint).
494 The DSCP field can have any value between 0x0 and 0x3f inclusive.
496 To compile it as a module, choose M here. If unsure, say N.
498 config NETFILTER_XT_MATCH_ESP
499 tristate '"ESP" match support'
500 depends on NETFILTER_XTABLES
502 This match extension allows you to match a range of SPIs
503 inside ESP header of IPSec packets.
505 To compile it as a module, choose M here. If unsure, say N.
507 config NETFILTER_XT_MATCH_HELPER
508 tristate '"helper" match support'
509 depends on NETFILTER_XTABLES
510 depends on IP_NF_CONNTRACK || NF_CONNTRACK
512 Helper matching allows you to match packets in dynamic connections
513 tracked by a conntrack-helper, ie. ip_conntrack_ftp
515 To compile it as a module, choose M here. If unsure, say Y.
517 config NETFILTER_XT_MATCH_LENGTH
518 tristate '"length" match support'
519 depends on NETFILTER_XTABLES
521 This option allows you to match the length of a packet against a
522 specific value or range of values.
524 To compile it as a module, choose M here. If unsure, say N.
526 config NETFILTER_XT_MATCH_LIMIT
527 tristate '"limit" match support'
528 depends on NETFILTER_XTABLES
530 limit matching allows you to control the rate at which a rule can be
531 matched: mainly useful in combination with the LOG target ("LOG
532 target support", below) and to avoid some Denial of Service attacks.
534 To compile it as a module, choose M here. If unsure, say N.
536 config NETFILTER_XT_MATCH_MAC
537 tristate '"mac" address match support'
538 depends on NETFILTER_XTABLES
540 MAC matching allows you to match packets based on the source
541 Ethernet address of the packet.
543 To compile it as a module, choose M here. If unsure, say N.
545 config NETFILTER_XT_MATCH_MARK
546 tristate '"mark" match support'
547 depends on NETFILTER_XTABLES
549 Netfilter mark matching allows you to match packets based on the
550 `nfmark' value in the packet. This can be set by the MARK target
553 To compile it as a module, choose M here. If unsure, say N.
555 config NETFILTER_XT_MATCH_POLICY
556 tristate 'IPsec "policy" match support'
557 depends on NETFILTER_XTABLES && XFRM
559 Policy matching allows you to match packets based on the
560 IPsec policy that was used during decapsulation/will
561 be used during encapsulation.
563 To compile it as a module, choose M here. If unsure, say N.
565 config NETFILTER_XT_MATCH_MULTIPORT
566 tristate "Multiple port match support"
567 depends on NETFILTER_XTABLES
569 Multiport matching allows you to match TCP or UDP packets based on
570 a series of source or destination ports: normally a rule can only
571 match a single range of ports.
573 To compile it as a module, choose M here. If unsure, say N.
575 config NETFILTER_XT_MATCH_PHYSDEV
576 tristate '"physdev" match support'
577 depends on NETFILTER_XTABLES && BRIDGE && BRIDGE_NETFILTER
579 Physdev packet matching matches against the physical bridge ports
580 the IP packet arrived on or will leave by.
582 To compile it as a module, choose M here. If unsure, say N.
584 config NETFILTER_XT_MATCH_PKTTYPE
585 tristate '"pkttype" packet type match support'
586 depends on NETFILTER_XTABLES
588 Packet type matching allows you to match a packet by
589 its "class", eg. BROADCAST, MULTICAST, ...
592 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
594 To compile it as a module, choose M here. If unsure, say N.
596 config NETFILTER_XT_MATCH_QUOTA
597 tristate '"quota" match support'
598 depends on NETFILTER_XTABLES
600 This option adds a `quota' match, which allows to match on a
603 If you want to compile it as a module, say M here and read
604 <file:Documentation/modules.txt>. If unsure, say `N'.
606 config NETFILTER_XT_MATCH_REALM
607 tristate '"realm" match support'
608 depends on NETFILTER_XTABLES
611 This option adds a `realm' match, which allows you to use the realm
612 key from the routing subsystem inside iptables.
614 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
617 If you want to compile it as a module, say M here and read
618 <file:Documentation/modules.txt>. If unsure, say `N'.
620 config NETFILTER_XT_MATCH_SCTP
621 tristate '"sctp" protocol match support (EXPERIMENTAL)'
622 depends on NETFILTER_XTABLES && EXPERIMENTAL
624 With this option enabled, you will be able to use the
625 `sctp' match in order to match on SCTP source/destination ports
626 and SCTP chunk types.
628 If you want to compile it as a module, say M here and read
629 <file:Documentation/modules.txt>. If unsure, say `N'.
631 config NETFILTER_XT_MATCH_STATE
632 tristate '"state" match support'
633 depends on NETFILTER_XTABLES
634 depends on IP_NF_CONNTRACK || NF_CONNTRACK
636 Connection state matching allows you to match packets based on their
637 relationship to a tracked connection (ie. previous packets). This
638 is a powerful tool for packet classification.
640 To compile it as a module, choose M here. If unsure, say N.
642 config NETFILTER_XT_MATCH_STATISTIC
643 tristate '"statistic" match support'
644 depends on NETFILTER_XTABLES
646 This option adds a `statistic' match, which allows you to match
647 on packets periodically or randomly with a given percentage.
649 To compile it as a module, choose M here. If unsure, say N.
651 config NETFILTER_XT_MATCH_STRING
652 tristate '"string" match support'
653 depends on NETFILTER_XTABLES
655 select TEXTSEARCH_KMP
657 select TEXTSEARCH_FSM
659 This option adds a `string' match, which allows you to look for
660 pattern matchings in packets.
662 To compile it as a module, choose M here. If unsure, say N.
664 config NETFILTER_XT_MATCH_TCPMSS
665 tristate '"tcpmss" match support'
666 depends on NETFILTER_XTABLES
668 This option adds a `tcpmss' match, which allows you to examine the
669 MSS value of TCP SYN packets, which control the maximum packet size
672 To compile it as a module, choose M here. If unsure, say N.
674 config NETFILTER_XT_MATCH_HASHLIMIT
675 tristate '"hashlimit" match support'
676 depends on NETFILTER_XTABLES && (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
678 This option adds a `hashlimit' match.
680 As opposed to `limit', this match dynamically creates a hash table
681 of limit buckets, based on your selection of source/destination
682 addresses and/or ports.
684 It enables you to express policies like `10kpps for any given
685 destination address' or `500pps from any given source address'