net/netfilter/Kconfig

   1 menu "Core Netfilter Configuration"
   2         depends on NET && INET && NETFILTER
   3
   4 config NETFILTER_NETLINK
   5         tristate
   6
   7 config NETFILTER_NETLINK_QUEUE
   8         tristate "Netfilter NFQUEUE over NFNETLINK interface"
   9         depends on NETFILTER_ADVANCED
  10         select NETFILTER_NETLINK
  11         help
  12           If this option is enabled, the kernel will include support
  13           for queueing packets via NFNETLINK.
  14
  15 config NETFILTER_NETLINK_LOG
  16         tristate "Netfilter LOG over NFNETLINK interface"
  17         default m if NETFILTER_ADVANCED=n
  18         select NETFILTER_NETLINK
  19         help
  20           If this option is enabled, the kernel will include support
  21           for logging packets via NFNETLINK.
  22
  23           This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
  24           and is also scheduled to replace the old syslog-based ipt_LOG
  25           and ip6t_LOG modules.
  26
  27 config NF_CONNTRACK
  28         tristate "Netfilter connection tracking support"
  29         default m if NETFILTER_ADVANCED=n
  30         help
  31           Connection tracking keeps a record of what packets have passed
  32           through your machine, in order to figure out how they are related
  33           into connections.
  34
  35           This is required to do Masquerading or other kinds of Network
  36           Address Translation.  It can also be used to enhance packet
  37           filtering (see `Connection state match support' below).
  38
  39           To compile it as a module, choose M here.  If unsure, say N.
  40
  41 if NF_CONNTRACK
  42
  43 config NF_CT_ACCT
  44         bool "Connection tracking flow accounting"
  45         depends on NETFILTER_ADVANCED
  46         help
  47           If this option is enabled, the connection tracking code will
  48           keep per-flow packet and byte counters.
  49
  50           Those counters can be used for flow-based accounting or the
  51           `connbytes' match.
  52
  53           Please note that currently this option only sets a default state.
  54           You may change it at boot time with nf_conntrack.acct=0/1 kernel
  55           parameter or by loading the nf_conntrack module with acct=0/1.
  56
  57           You may also disable/enable it on a running system with:
  58            sysctl net.netfilter.nf_conntrack_acct=0/1
  59
  60           This option will be removed in 2.6.29.
  61
  62           If unsure, say `N'.
  63
  64 config NF_CONNTRACK_MARK
  65         bool  'Connection mark tracking support'
  66         depends on NETFILTER_ADVANCED
  67         help
  68           This option enables support for connection marks, used by the
  69           `CONNMARK' target and `connmark' match. Similar to the mark value
  70           of packets, but this mark value is kept in the conntrack session
  71           instead of the individual packets.
  72
  73 config NF_CONNTRACK_SECMARK
  74         bool  'Connection tracking security mark support'
  75         depends on NETWORK_SECMARK
  76         default m if NETFILTER_ADVANCED=n
  77         help
  78           This option enables security markings to be applied to
  79           connections.  Typically they are copied to connections from
  80           packets using the CONNSECMARK target and copied back from
  81           connections to packets with the same target, with the packets
  82           being originally labeled via SECMARK.
  83
  84           If unsure, say 'N'.
  85
  86 config NF_CONNTRACK_EVENTS
  87         bool "Connection tracking events"
  88         depends on NETFILTER_ADVANCED
  89         help
  90           If this option is enabled, the connection tracking code will
  91           provide a notifier chain that can be used by other kernel code
  92           to get notified about changes in the connection tracking state.
  93
  94           If unsure, say `N'.
  95
  96 config NF_CT_PROTO_DCCP
  97         tristate 'DCCP protocol connection tracking support (EXPERIMENTAL)'
  98         depends on EXPERIMENTAL
  99         depends on NETFILTER_ADVANCED
 100         default IP_DCCP
 101         help
 102           With this option enabled, the layer 3 independent connection
 103           tracking code will be able to do state tracking on DCCP connections.
 104
 105           If unsure, say 'N'.
 106
 107 config NF_CT_PROTO_GRE
 108         tristate
 109
 110 config NF_CT_PROTO_SCTP
 111         tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
 112         depends on EXPERIMENTAL
 113         depends on NETFILTER_ADVANCED
 114         default IP_SCTP
 115         help
 116           With this option enabled, the layer 3 independent connection
 117           tracking code will be able to do state tracking on SCTP connections.
 118
 119           If you want to compile it as a module, say M here and read
 120           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 121
 122 config NF_CT_PROTO_UDPLITE
 123         tristate 'UDP-Lite protocol connection tracking support'
 124         depends on NETFILTER_ADVANCED
 125         help
 126           With this option enabled, the layer 3 independent connection
 127           tracking code will be able to do state tracking on UDP-Lite
 128           connections.
 129
 130           To compile it as a module, choose M here.  If unsure, say N.
 131
 132 config NF_CONNTRACK_AMANDA
 133         tristate "Amanda backup protocol support"
 134         depends on NETFILTER_ADVANCED
 135         select TEXTSEARCH
 136         select TEXTSEARCH_KMP
 137         help
 138           If you are running the Amanda backup package <http://www.amanda.org/>
 139           on this machine or machines that will be MASQUERADED through this
 140           machine, then you may want to enable this feature.  This allows the
 141           connection tracking and natting code to allow the sub-channels that
 142           Amanda requires for communication of the backup data, messages and
 143           index.
 144
 145           To compile it as a module, choose M here.  If unsure, say N.
 146
 147 config NF_CONNTRACK_FTP
 148         tristate "FTP protocol support"
 149         default m if NETFILTER_ADVANCED=n
 150         help
 151           Tracking FTP connections is problematic: special helpers are
 152           required for tracking them, and doing masquerading and other forms
 153           of Network Address Translation on them.
 154
 155           This is FTP support on Layer 3 independent connection tracking.
 156           Layer 3 independent connection tracking is experimental scheme
 157           which generalize ip_conntrack to support other layer 3 protocols.
 158
 159           To compile it as a module, choose M here.  If unsure, say N.
 160
 161 config NF_CONNTRACK_H323
 162         tristate "H.323 protocol support"
 163         depends on (IPV6 || IPV6=n)
 164         depends on NETFILTER_ADVANCED
 165         help
 166           H.323 is a VoIP signalling protocol from ITU-T. As one of the most
 167           important VoIP protocols, it is widely used by voice hardware and
 168           software including voice gateways, IP phones, Netmeeting, OpenPhone,
 169           Gnomemeeting, etc.
 170
 171           With this module you can support H.323 on a connection tracking/NAT
 172           firewall.
 173
 174           This module supports RAS, Fast Start, H.245 Tunnelling, Call
 175           Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
 176           whiteboard, file transfer, etc. For more information, please
 177           visit http://nath323.sourceforge.net/.
 178
 179           To compile it as a module, choose M here.  If unsure, say N.
 180
 181 config NF_CONNTRACK_IRC
 182         tristate "IRC protocol support"
 183         default m if NETFILTER_ADVANCED=n
 184         help
 185           There is a commonly-used extension to IRC called
 186           Direct Client-to-Client Protocol (DCC).  This enables users to send
 187           files to each other, and also chat to each other without the need
 188           of a server.  DCC Sending is used anywhere you send files over IRC,
 189           and DCC Chat is most commonly used by Eggdrop bots.  If you are
 190           using NAT, this extension will enable you to send files and initiate
 191           chats.  Note that you do NOT need this extension to get files or
 192           have others initiate chats, or everything else in IRC.
 193
 194           To compile it as a module, choose M here.  If unsure, say N.
 195
 196 config NF_CONNTRACK_NETBIOS_NS
 197         tristate "NetBIOS name service protocol support"
 198         depends on NETFILTER_ADVANCED
 199         help
 200           NetBIOS name service requests are sent as broadcast messages from an
 201           unprivileged port and responded to with unicast messages to the
 202           same port. This make them hard to firewall properly because connection
 203           tracking doesn't deal with broadcasts. This helper tracks locally
 204           originating NetBIOS name service requests and the corresponding
 205           responses. It relies on correct IP address configuration, specifically
 206           netmask and broadcast address. When properly configured, the output
 207           of "ip address show" should look similar to this:
 208
 209           $ ip -4 address show eth0
 210           4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
 211               inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
 212
 213           To compile it as a module, choose M here.  If unsure, say N.
 214
 215 config NF_CONNTRACK_PPTP
 216         tristate "PPtP protocol support"
 217         depends on NETFILTER_ADVANCED
 218         select NF_CT_PROTO_GRE
 219         help
 220           This module adds support for PPTP (Point to Point Tunnelling
 221           Protocol, RFC2637) connection tracking and NAT.
 222
 223           If you are running PPTP sessions over a stateful firewall or NAT
 224           box, you may want to enable this feature.
 225
 226           Please note that not all PPTP modes of operation are supported yet.
 227           Specifically these limitations exist:
 228             - Blindly assumes that control connections are always established
 229               in PNS->PAC direction. This is a violation of RFC2637.
 230             - Only supports a single call within each session
 231
 232           To compile it as a module, choose M here.  If unsure, say N.
 233
 234 config NF_CONNTRACK_SANE
 235         tristate "SANE protocol support (EXPERIMENTAL)"
 236         depends on EXPERIMENTAL
 237         depends on NETFILTER_ADVANCED
 238         help
 239           SANE is a protocol for remote access to scanners as implemented
 240           by the 'saned' daemon. Like FTP, it uses separate control and
 241           data connections.
 242
 243           With this module you can support SANE on a connection tracking
 244           firewall.
 245
 246           To compile it as a module, choose M here.  If unsure, say N.
 247
 248 config NF_CONNTRACK_SIP
 249         tristate "SIP protocol support"
 250         default m if NETFILTER_ADVANCED=n
 251         help
 252           SIP is an application-layer control protocol that can establish,
 253           modify, and terminate multimedia sessions (conferences) such as
 254           Internet telephony calls. With the ip_conntrack_sip and
 255           the nf_nat_sip modules you can support the protocol on a connection
 256           tracking/NATing firewall.
 257
 258           To compile it as a module, choose M here.  If unsure, say N.
 259
 260 config NF_CONNTRACK_TFTP
 261         tristate "TFTP protocol support"
 262         depends on NETFILTER_ADVANCED
 263         help
 264           TFTP connection tracking helper, this is required depending
 265           on how restrictive your ruleset is.
 266           If you are using a tftp client behind -j SNAT or -j MASQUERADING
 267           you will need this.
 268
 269           To compile it as a module, choose M here.  If unsure, say N.
 270
 271 config NF_CT_NETLINK
 272         tristate 'Connection tracking netlink interface'
 273         select NETFILTER_NETLINK
 274         default m if NETFILTER_ADVANCED=n
 275         help
 276           This option enables support for a netlink-based userspace interface
 277
 278 endif # NF_CONNTRACK
 279
 280 # transparent proxy support
 281 config NETFILTER_TPROXY
 282         tristate "Transparent proxying support (EXPERIMENTAL)"
 283         depends on EXPERIMENTAL
 284         depends on IP_NF_MANGLE
 285         depends on NETFILTER_ADVANCED
 286         help
 287           This option enables transparent proxying support, that is,
 288           support for handling non-locally bound IPv4 TCP and UDP sockets.
 289           For it to work you will have to configure certain iptables rules
 290           and use policy routing. For more information on how to set it up
 291           see Documentation/networking/tproxy.txt.
 292
 293           To compile it as a module, choose M here.  If unsure, say N.
 294
 295 config NETFILTER_XTABLES
 296         tristate "Netfilter Xtables support (required for ip_tables)"
 297         default m if NETFILTER_ADVANCED=n
 298         help
 299           This is required if you intend to use any of ip_tables,
 300           ip6_tables or arp_tables.
 301
 302 if NETFILTER_XTABLES
 303
 304 # alphabetically ordered list of targets
 305
 306 config NETFILTER_XT_TARGET_CLASSIFY
 307         tristate '"CLASSIFY" target support'
 308         depends on NETFILTER_ADVANCED
 309         help
 310           This option adds a `CLASSIFY' target, which enables the user to set
 311           the priority of a packet. Some qdiscs can use this value for
 312           classification, among these are:
 313
 314           atm, cbq, dsmark, pfifo_fast, htb, prio
 315
 316           To compile it as a module, choose M here.  If unsure, say N.
 317
 318 config NETFILTER_XT_TARGET_CONNMARK
 319         tristate  '"CONNMARK" target support'
 320         depends on NF_CONNTRACK
 321         depends on NETFILTER_ADVANCED
 322         select NF_CONNTRACK_MARK
 323         help
 324           This option adds a `CONNMARK' target, which allows one to manipulate
 325           the connection mark value.  Similar to the MARK target, but
 326           affects the connection mark value rather than the packet mark value.
 327
 328           If you want to compile it as a module, say M here and read
 329           <file:Documentation/kbuild/modules.txt>.  The module will be called
 330           ipt_CONNMARK.  If unsure, say `N'.
 331
 332 config NETFILTER_XT_TARGET_CONNSECMARK
 333         tristate '"CONNSECMARK" target support'
 334         depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
 335         default m if NETFILTER_ADVANCED=n
 336         help
 337           The CONNSECMARK target copies security markings from packets
 338           to connections, and restores security markings from connections
 339           to packets (if the packets are not already marked).  This would
 340           normally be used in conjunction with the SECMARK target.
 341
 342           To compile it as a module, choose M here.  If unsure, say N.
 343
 344 config NETFILTER_XT_TARGET_DSCP
 345         tristate '"DSCP" and "TOS" target support'
 346         depends on IP_NF_MANGLE || IP6_NF_MANGLE
 347         depends on NETFILTER_ADVANCED
 348         help
 349           This option adds a `DSCP' target, which allows you to manipulate
 350           the IPv4/IPv6 header DSCP field (differentiated services codepoint).
 351
 352           The DSCP field can have any value between 0x0 and 0x3f inclusive.
 353
 354           It also adds the "TOS" target, which allows you to create rules in
 355           the "mangle" table which alter the Type Of Service field of an IPv4
 356           or the Priority field of an IPv6 packet, prior to routing.
 357
 358           To compile it as a module, choose M here.  If unsure, say N.
 359
 360 config NETFILTER_XT_TARGET_HL
 361         tristate '"HL" hoplimit target support'
 362         depends on IP_NF_MANGLE || IP6_NF_MANGLE
 363         depends on NETFILTER_ADVANCED
 364         ---help---
 365         This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
 366         targets, which enable the user to change the
 367         hoplimit/time-to-live value of the IP header.
 368
 369         While it is safe to decrement the hoplimit/TTL value, the
 370         modules also allow to increment and set the hoplimit value of
 371         the header to arbitrary values. This is EXTREMELY DANGEROUS
 372         since you can easily create immortal packets that loop
 373         forever on the network.
 374
 375 config NETFILTER_XT_TARGET_LED
 376         tristate '"LED" target support'
 377         depends on LEDS_CLASS && LEDS_TRIGGERS
 378         depends on NETFILTER_ADVANCED
 379         help
 380           This option adds a `LED' target, which allows you to blink LEDs in
 381           response to particular packets passing through your machine.
 382
 383           This can be used to turn a spare LED into a network activity LED,
 384           which only flashes in response to FTP transfers, for example.  Or
 385           you could have an LED which lights up for a minute or two every time
 386           somebody connects to your machine via SSH.
 387
 388           You will need support for the "led" class to make this work.
 389
 390           To create an LED trigger for incoming SSH traffic:
 391             iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
 392
 393           Then attach the new trigger to an LED on your system:
 394             echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
 395
 396           For more information on the LEDs available on your system, see
 397           Documentation/leds-class.txt
 398
 399 config NETFILTER_XT_TARGET_MARK
 400         tristate '"MARK" target support'
 401         default m if NETFILTER_ADVANCED=n
 402         help
 403           This option adds a `MARK' target, which allows you to create rules
 404           in the `mangle' table which alter the netfilter mark (nfmark) field
 405           associated with the packet prior to routing. This can change
 406           the routing method (see `Use netfilter MARK value as routing
 407           key') and can also be used by other subsystems to change their
 408           behavior.
 409
 410           To compile it as a module, choose M here.  If unsure, say N.
 411
 412 config NETFILTER_XT_TARGET_NFLOG
 413         tristate '"NFLOG" target support'
 414         default m if NETFILTER_ADVANCED=n
 415         select NETFILTER_NETLINK_LOG
 416         help
 417           This option enables the NFLOG target, which allows to LOG
 418           messages through nfnetlink_log.
 419
 420           To compile it as a module, choose M here.  If unsure, say N.
 421
 422 config NETFILTER_XT_TARGET_NFQUEUE
 423         tristate '"NFQUEUE" target Support'
 424         depends on NETFILTER_ADVANCED
 425         help
 426           This target replaced the old obsolete QUEUE target.
 427
 428           As opposed to QUEUE, it supports 65535 different queues,
 429           not just one.
 430
 431           To compile it as a module, choose M here.  If unsure, say N.
 432
 433 config NETFILTER_XT_TARGET_NOTRACK
 434         tristate  '"NOTRACK" target support'
 435         depends on IP_NF_RAW || IP6_NF_RAW
 436         depends on NF_CONNTRACK
 437         depends on NETFILTER_ADVANCED
 438         help
 439           The NOTRACK target allows a select rule to specify
 440           which packets *not* to enter the conntrack/NAT
 441           subsystem with all the consequences (no ICMP error tracking,
 442           no protocol helpers for the selected packets).
 443
 444           If you want to compile it as a module, say M here and read
 445           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 446
 447 config NETFILTER_XT_TARGET_RATEEST
 448         tristate '"RATEEST" target support'
 449         depends on NETFILTER_ADVANCED
 450         help
 451           This option adds a `RATEEST' target, which allows to measure
 452           rates similar to TC estimators. The `rateest' match can be
 453           used to match on the measured rates.
 454
 455           To compile it as a module, choose M here.  If unsure, say N.
 456
 457 config NETFILTER_XT_TARGET_TPROXY
 458         tristate '"TPROXY" target support (EXPERIMENTAL)'
 459         depends on EXPERIMENTAL
 460         depends on NETFILTER_TPROXY
 461         depends on NETFILTER_XTABLES
 462         depends on NETFILTER_ADVANCED
 463         select NF_DEFRAG_IPV4
 464         help
 465           This option adds a `TPROXY' target, which is somewhat similar to
 466           REDIRECT.  It can only be used in the mangle table and is useful
 467           to redirect traffic to a transparent proxy.  It does _not_ depend
 468           on Netfilter connection tracking and NAT, unlike REDIRECT.
 469
 470           To compile it as a module, choose M here.  If unsure, say N.
 471
 472 config NETFILTER_XT_TARGET_TRACE
 473         tristate  '"TRACE" target support'
 474         depends on IP_NF_RAW || IP6_NF_RAW
 475         depends on NETFILTER_ADVANCED
 476         help
 477           The TRACE target allows you to mark packets so that the kernel
 478           will log every rule which match the packets as those traverse
 479           the tables, chains, rules.
 480
 481           If you want to compile it as a module, say M here and read
 482           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 483
 484 config NETFILTER_XT_TARGET_SECMARK
 485         tristate '"SECMARK" target support'
 486         depends on NETWORK_SECMARK
 487         default m if NETFILTER_ADVANCED=n
 488         help
 489           The SECMARK target allows security marking of network
 490           packets, for use with security subsystems.
 491
 492           To compile it as a module, choose M here.  If unsure, say N.
 493
 494 config NETFILTER_XT_TARGET_TCPMSS
 495         tristate '"TCPMSS" target support'
 496         depends on (IPV6 || IPV6=n)
 497         default m if NETFILTER_ADVANCED=n
 498         ---help---
 499           This option adds a `TCPMSS' target, which allows you to alter the
 500           MSS value of TCP SYN packets, to control the maximum size for that
 501           connection (usually limiting it to your outgoing interface's MTU
 502           minus 40).
 503
 504           This is used to overcome criminally braindead ISPs or servers which
 505           block ICMP Fragmentation Needed packets.  The symptoms of this
 506           problem are that everything works fine from your Linux
 507           firewall/router, but machines behind it can never exchange large
 508           packets:
 509                 1) Web browsers connect, then hang with no data received.
 510                 2) Small mail works fine, but large emails hang.
 511                 3) ssh works fine, but scp hangs after initial handshaking.
 512
 513           Workaround: activate this option and add a rule to your firewall
 514           configuration like:
 515
 516           iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
 517                          -j TCPMSS --clamp-mss-to-pmtu
 518
 519           To compile it as a module, choose M here.  If unsure, say N.
 520
 521 config NETFILTER_XT_TARGET_TCPOPTSTRIP
 522         tristate '"TCPOPTSTRIP" target support (EXPERIMENTAL)'
 523         depends on EXPERIMENTAL
 524         depends on IP_NF_MANGLE || IP6_NF_MANGLE
 525         depends on NETFILTER_ADVANCED
 526         help
 527           This option adds a "TCPOPTSTRIP" target, which allows you to strip
 528           TCP options from TCP packets.
 529
 530 config NETFILTER_XT_MATCH_CLUSTER
 531         tristate '"cluster" match support'
 532         depends on NF_CONNTRACK
 533         depends on NETFILTER_ADVANCED
 534         ---help---
 535           This option allows you to build work-load-sharing clusters of
 536           network servers/stateful firewalls without having a dedicated
 537           load-balancing router/server/switch. Basically, this match returns
 538           true when the packet must be handled by this cluster node. Thus,
 539           all nodes see all packets and this match decides which node handles
 540           what packets. The work-load sharing algorithm is based on source
 541           address hashing.
 542
 543           If you say Y or M here, try `iptables -m cluster --help` for
 544           more information.
 545
 546 config NETFILTER_XT_MATCH_COMMENT
 547         tristate  '"comment" match support'
 548         depends on NETFILTER_ADVANCED
 549         help
 550           This option adds a `comment' dummy-match, which allows you to put
 551           comments in your iptables ruleset.
 552
 553           If you want to compile it as a module, say M here and read
 554           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 555
 556 config NETFILTER_XT_MATCH_CONNBYTES
 557         tristate  '"connbytes" per-connection counter match support'
 558         depends on NF_CONNTRACK
 559         depends on NETFILTER_ADVANCED
 560         select NF_CT_ACCT
 561         help
 562           This option adds a `connbytes' match, which allows you to match the
 563           number of bytes and/or packets for each direction within a connection.
 564
 565           If you want to compile it as a module, say M here and read
 566           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 567
 568 config NETFILTER_XT_MATCH_CONNLIMIT
 569         tristate '"connlimit" match support"'
 570         depends on NF_CONNTRACK
 571         depends on NETFILTER_ADVANCED
 572         ---help---
 573           This match allows you to match against the number of parallel
 574           connections to a server per client IP address (or address block).
 575
 576 config NETFILTER_XT_MATCH_CONNMARK
 577         tristate  '"connmark" connection mark match support'
 578         depends on NF_CONNTRACK
 579         depends on NETFILTER_ADVANCED
 580         select NF_CONNTRACK_MARK
 581         help
 582           This option adds a `connmark' match, which allows you to match the
 583           connection mark value previously set for the session by `CONNMARK'.
 584
 585           If you want to compile it as a module, say M here and read
 586           <file:Documentation/kbuild/modules.txt>.  The module will be called
 587           ipt_connmark.  If unsure, say `N'.
 588
 589 config NETFILTER_XT_MATCH_CONNTRACK
 590         tristate '"conntrack" connection tracking match support'
 591         depends on NF_CONNTRACK
 592         default m if NETFILTER_ADVANCED=n
 593         help
 594           This is a general conntrack match module, a superset of the state match.
 595
 596           It allows matching on additional conntrack information, which is
 597           useful in complex configurations, such as NAT gateways with multiple
 598           internet links or tunnels.
 599
 600           To compile it as a module, choose M here.  If unsure, say N.
 601
 602 config NETFILTER_XT_MATCH_DCCP
 603         tristate '"dccp" protocol match support'
 604         depends on NETFILTER_ADVANCED
 605         default IP_DCCP
 606         help
 607           With this option enabled, you will be able to use the iptables
 608           `dccp' match in order to match on DCCP source/destination ports
 609           and DCCP flags.
 610
 611           If you want to compile it as a module, say M here and read
 612           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 613
 614 config NETFILTER_XT_MATCH_DSCP
 615         tristate '"dscp" and "tos" match support'
 616         depends on NETFILTER_ADVANCED
 617         help
 618           This option adds a `DSCP' match, which allows you to match against
 619           the IPv4/IPv6 header DSCP field (differentiated services codepoint).
 620
 621           The DSCP field can have any value between 0x0 and 0x3f inclusive.
 622
 623           It will also add a "tos" match, which allows you to match packets
 624           based on the Type Of Service fields of the IPv4 packet (which share
 625           the same bits as DSCP).
 626
 627           To compile it as a module, choose M here.  If unsure, say N.
 628
 629 config NETFILTER_XT_MATCH_ESP
 630         tristate '"esp" match support'
 631         depends on NETFILTER_ADVANCED
 632         help
 633           This match extension allows you to match a range of SPIs
 634           inside ESP header of IPSec packets.
 635
 636           To compile it as a module, choose M here.  If unsure, say N.
 637
 638 config NETFILTER_XT_MATCH_HASHLIMIT
 639         tristate '"hashlimit" match support'
 640         depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
 641         depends on NETFILTER_ADVANCED
 642         help
 643           This option adds a `hashlimit' match.
 644
 645           As opposed to `limit', this match dynamically creates a hash table
 646           of limit buckets, based on your selection of source/destination
 647           addresses and/or ports.
 648
 649           It enables you to express policies like `10kpps for any given
 650           destination address' or `500pps from any given source address'
 651           with a single rule.
 652
 653 config NETFILTER_XT_MATCH_HELPER
 654         tristate '"helper" match support'
 655         depends on NF_CONNTRACK
 656         depends on NETFILTER_ADVANCED
 657         help
 658           Helper matching allows you to match packets in dynamic connections
 659           tracked by a conntrack-helper, ie. ip_conntrack_ftp
 660
 661           To compile it as a module, choose M here.  If unsure, say Y.
 662
 663 config NETFILTER_XT_MATCH_HL
 664         tristate '"hl" hoplimit/TTL match support'
 665         depends on NETFILTER_ADVANCED
 666         ---help---
 667         HL matching allows you to match packets based on the hoplimit
 668         in the IPv6 header, or the time-to-live field in the IPv4
 669         header of the packet.
 670
 671 config NETFILTER_XT_MATCH_IPRANGE
 672         tristate '"iprange" address range match support'
 673         depends on NETFILTER_ADVANCED
 674         ---help---
 675         This option adds a "iprange" match, which allows you to match based on
 676         an IP address range. (Normal iptables only matches on single addresses
 677         with an optional mask.)
 678
 679         If unsure, say M.
 680
 681 config NETFILTER_XT_MATCH_LENGTH
 682         tristate '"length" match support'
 683         depends on NETFILTER_ADVANCED
 684         help
 685           This option allows you to match the length of a packet against a
 686           specific value or range of values.
 687
 688           To compile it as a module, choose M here.  If unsure, say N.
 689
 690 config NETFILTER_XT_MATCH_LIMIT
 691         tristate '"limit" match support'
 692         depends on NETFILTER_ADVANCED
 693         help
 694           limit matching allows you to control the rate at which a rule can be
 695           matched: mainly useful in combination with the LOG target ("LOG
 696           target support", below) and to avoid some Denial of Service attacks.
 697
 698           To compile it as a module, choose M here.  If unsure, say N.
 699
 700 config NETFILTER_XT_MATCH_MAC
 701         tristate '"mac" address match support'
 702         depends on NETFILTER_ADVANCED
 703         help
 704           MAC matching allows you to match packets based on the source
 705           Ethernet address of the packet.
 706
 707           To compile it as a module, choose M here.  If unsure, say N.
 708
 709 config NETFILTER_XT_MATCH_MARK
 710         tristate '"mark" match support'
 711         default m if NETFILTER_ADVANCED=n
 712         help
 713           Netfilter mark matching allows you to match packets based on the
 714           `nfmark' value in the packet.  This can be set by the MARK target
 715           (see below).
 716
 717           To compile it as a module, choose M here.  If unsure, say N.
 718
 719 config NETFILTER_XT_MATCH_MULTIPORT
 720         tristate '"multiport" Multiple port match support'
 721         depends on NETFILTER_ADVANCED
 722         help
 723           Multiport matching allows you to match TCP or UDP packets based on
 724           a series of source or destination ports: normally a rule can only
 725           match a single range of ports.
 726
 727           To compile it as a module, choose M here.  If unsure, say N.
 728
 729 config NETFILTER_XT_MATCH_OWNER
 730         tristate '"owner" match support'
 731         depends on NETFILTER_ADVANCED
 732         ---help---
 733         Socket owner matching allows you to match locally-generated packets
 734         based on who created the socket: the user or group. It is also
 735         possible to check whether a socket actually exists.
 736
 737 config NETFILTER_XT_MATCH_POLICY
 738         tristate 'IPsec "policy" match support'
 739         depends on XFRM
 740         default m if NETFILTER_ADVANCED=n
 741         help
 742           Policy matching allows you to match packets based on the
 743           IPsec policy that was used during decapsulation/will
 744           be used during encapsulation.
 745
 746           To compile it as a module, choose M here.  If unsure, say N.
 747
 748 config NETFILTER_XT_MATCH_PHYSDEV
 749         tristate '"physdev" match support'
 750         depends on BRIDGE && BRIDGE_NETFILTER
 751         depends on NETFILTER_ADVANCED
 752         help
 753           Physdev packet matching matches against the physical bridge ports
 754           the IP packet arrived on or will leave by.
 755
 756           To compile it as a module, choose M here.  If unsure, say N.
 757
 758 config NETFILTER_XT_MATCH_PKTTYPE
 759         tristate '"pkttype" packet type match support'
 760         depends on NETFILTER_ADVANCED
 761         help
 762           Packet type matching allows you to match a packet by
 763           its "class", eg. BROADCAST, MULTICAST, ...
 764
 765           Typical usage:
 766           iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
 767
 768           To compile it as a module, choose M here.  If unsure, say N.
 769
 770 config NETFILTER_XT_MATCH_QUOTA
 771         tristate '"quota" match support'
 772         depends on NETFILTER_ADVANCED
 773         help
 774           This option adds a `quota' match, which allows to match on a
 775           byte counter.
 776
 777           If you want to compile it as a module, say M here and read
 778           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 779
 780 config NETFILTER_XT_MATCH_RATEEST
 781         tristate '"rateest" match support'
 782         depends on NETFILTER_ADVANCED
 783         select NETFILTER_XT_TARGET_RATEEST
 784         help
 785           This option adds a `rateest' match, which allows to match on the
 786           rate estimated by the RATEEST target.
 787
 788           To compile it as a module, choose M here.  If unsure, say N.
 789
 790 config NETFILTER_XT_MATCH_REALM
 791         tristate  '"realm" match support'
 792         depends on NETFILTER_ADVANCED
 793         select NET_CLS_ROUTE
 794         help
 795           This option adds a `realm' match, which allows you to use the realm
 796           key from the routing subsystem inside iptables.
 797
 798           This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
 799           in tc world.
 800
 801           If you want to compile it as a module, say M here and read
 802           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 803
 804 config NETFILTER_XT_MATCH_RECENT
 805         tristate '"recent" match support'
 806         depends on NETFILTER_ADVANCED
 807         ---help---
 808         This match is used for creating one or many lists of recently
 809         used addresses and then matching against that/those list(s).
 810
 811         Short options are available by using 'iptables -m recent -h'
 812         Official Website: <http://snowman.net/projects/ipt_recent/>
 813
 814 config NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
 815         bool 'Enable obsolete /proc/net/ipt_recent'
 816         depends on NETFILTER_XT_MATCH_RECENT && PROC_FS
 817         ---help---
 818         This option enables the old /proc/net/ipt_recent interface,
 819         which has been obsoleted by /proc/net/xt_recent.
 820
 821 config NETFILTER_XT_MATCH_SCTP
 822         tristate  '"sctp" protocol match support (EXPERIMENTAL)'
 823         depends on EXPERIMENTAL
 824         depends on NETFILTER_ADVANCED
 825         default IP_SCTP
 826         help
 827           With this option enabled, you will be able to use the
 828           `sctp' match in order to match on SCTP source/destination ports
 829           and SCTP chunk types.
 830
 831           If you want to compile it as a module, say M here and read
 832           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 833
 834 config NETFILTER_XT_MATCH_SOCKET
 835         tristate '"socket" match support (EXPERIMENTAL)'
 836         depends on EXPERIMENTAL
 837         depends on NETFILTER_TPROXY
 838         depends on NETFILTER_XTABLES
 839         depends on NETFILTER_ADVANCED
 840         depends on !NF_CONNTRACK || NF_CONNTRACK
 841         select NF_DEFRAG_IPV4
 842         help
 843           This option adds a `socket' match, which can be used to match
 844           packets for which a TCP or UDP socket lookup finds a valid socket.
 845           It can be used in combination with the MARK target and policy
 846           routing to implement full featured non-locally bound sockets.
 847
 848           To compile it as a module, choose M here.  If unsure, say N.
 849
 850 config NETFILTER_XT_MATCH_STATE
 851         tristate '"state" match support'
 852         depends on NF_CONNTRACK
 853         default m if NETFILTER_ADVANCED=n
 854         help
 855           Connection state matching allows you to match packets based on their
 856           relationship to a tracked connection (ie. previous packets).  This
 857           is a powerful tool for packet classification.
 858
 859           To compile it as a module, choose M here.  If unsure, say N.
 860
 861 config NETFILTER_XT_MATCH_STATISTIC
 862         tristate '"statistic" match support'
 863         depends on NETFILTER_ADVANCED
 864         help
 865           This option adds a `statistic' match, which allows you to match
 866           on packets periodically or randomly with a given percentage.
 867
 868           To compile it as a module, choose M here.  If unsure, say N.
 869
 870 config NETFILTER_XT_MATCH_STRING
 871         tristate  '"string" match support'
 872         depends on NETFILTER_ADVANCED
 873         select TEXTSEARCH
 874         select TEXTSEARCH_KMP
 875         select TEXTSEARCH_BM
 876         select TEXTSEARCH_FSM
 877         help
 878           This option adds a `string' match, which allows you to look for
 879           pattern matchings in packets.
 880
 881           To compile it as a module, choose M here.  If unsure, say N.
 882
 883 config NETFILTER_XT_MATCH_TCPMSS
 884         tristate '"tcpmss" match support'
 885         depends on NETFILTER_ADVANCED
 886         help
 887           This option adds a `tcpmss' match, which allows you to examine the
 888           MSS value of TCP SYN packets, which control the maximum packet size
 889           for that connection.
 890
 891           To compile it as a module, choose M here.  If unsure, say N.
 892
 893 config NETFILTER_XT_MATCH_TIME
 894         tristate '"time" match support'
 895         depends on NETFILTER_ADVANCED
 896         ---help---
 897           This option adds a "time" match, which allows you to match based on
 898           the packet arrival time (at the machine which netfilter is running)
 899           on) or departure time/date (for locally generated packets).
 900
 901           If you say Y here, try `iptables -m time --help` for
 902           more information.
 903
 904           If you want to compile it as a module, say M here.
 905           If unsure, say N.
 906
 907 config NETFILTER_XT_MATCH_U32
 908         tristate '"u32" match support'
 909         depends on NETFILTER_ADVANCED
 910         ---help---
 911           u32 allows you to extract quantities of up to 4 bytes from a packet,
 912           AND them with specified masks, shift them by specified amounts and
 913           test whether the results are in any of a set of specified ranges.
 914           The specification of what to extract is general enough to skip over
 915           headers with lengths stored in the packet, as in IP or TCP header
 916           lengths.
 917
 918           Details and examples are in the kernel module source.
 919
 920 config NETFILTER_XT_MATCH_OSF
 921         tristate '"osf" Passive OS fingerprint match'
 922         depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
 923         help
 924           This option selects the Passive OS Fingerprinting match module
 925           that allows to passively match the remote operating system by
 926           analyzing incoming TCP SYN packets.
 927
 928           Rules and loading software can be downloaded from
 929           http://www.ioremap.net/projects/osf
 930
 931           To compile it as a module, choose M here.  If unsure, say N.
 932
 933 endif # NETFILTER_XTABLES
 934
 935 endmenu
 936
 937 source "net/netfilter/ipvs/Kconfig"