net/netfilter/Kconfig

   1 menu "Core Netfilter Configuration"
   2         depends on NET && INET && NETFILTER
   3
   4 config NETFILTER_NETLINK
   5        tristate "Netfilter netlink interface"
   6        help
   7          If this option is enabled, the kernel will include support
   8          for the new netfilter netlink interface.
   9
  10 config NETFILTER_NETLINK_QUEUE
  11         tristate "Netfilter NFQUEUE over NFNETLINK interface"
  12         depends on NETFILTER_NETLINK
  13         help
  14           If this option is enabled, the kernel will include support
  15           for queueing packets via NFNETLINK.
  16
  17 config NETFILTER_NETLINK_LOG
  18         tristate "Netfilter LOG over NFNETLINK interface"
  19         depends on NETFILTER_NETLINK
  20         help
  21           If this option is enabled, the kernel will include support
  22           for logging packets via NFNETLINK.
  23
  24           This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
  25           and is also scheduled to replace the old syslog-based ipt_LOG
  26           and ip6t_LOG modules.
  27
  28 # Rename this to NF_CONNTRACK in a 2.6.25
  29 config NF_CONNTRACK_ENABLED
  30         tristate "Netfilter connection tracking support"
  31         help
  32           Connection tracking keeps a record of what packets have passed
  33           through your machine, in order to figure out how they are related
  34           into connections.
  35
  36           This is required to do Masquerading or other kinds of Network
  37           Address Translation (except for Fast NAT).  It can also be used to
  38           enhance packet filtering (see `Connection state match support'
  39           below).
  40
  41           To compile it as a module, choose M here.  If unsure, say N.
  42
  43 config NF_CONNTRACK
  44         tristate
  45         default NF_CONNTRACK_ENABLED
  46
  47 config NF_CT_ACCT
  48         bool "Connection tracking flow accounting"
  49         depends on NF_CONNTRACK
  50         help
  51           If this option is enabled, the connection tracking code will
  52           keep per-flow packet and byte counters.
  53
  54           Those counters can be used for flow-based accounting or the
  55           `connbytes' match.
  56
  57           If unsure, say `N'.
  58
  59 config NF_CONNTRACK_MARK
  60         bool  'Connection mark tracking support'
  61         depends on NF_CONNTRACK
  62         help
  63           This option enables support for connection marks, used by the
  64           `CONNMARK' target and `connmark' match. Similar to the mark value
  65           of packets, but this mark value is kept in the conntrack session
  66           instead of the individual packets.
  67
  68 config NF_CONNTRACK_SECMARK
  69         bool  'Connection tracking security mark support'
  70         depends on NF_CONNTRACK && NETWORK_SECMARK
  71         help
  72           This option enables security markings to be applied to
  73           connections.  Typically they are copied to connections from
  74           packets using the CONNSECMARK target and copied back from
  75           connections to packets with the same target, with the packets
  76           being originally labeled via SECMARK.
  77
  78           If unsure, say 'N'.
  79
  80 config NF_CONNTRACK_EVENTS
  81         bool "Connection tracking events (EXPERIMENTAL)"
  82         depends on EXPERIMENTAL && NF_CONNTRACK
  83         help
  84           If this option is enabled, the connection tracking code will
  85           provide a notifier chain that can be used by other kernel code
  86           to get notified about changes in the connection tracking state.
  87
  88           If unsure, say `N'.
  89
  90 config NF_CT_PROTO_GRE
  91         tristate
  92         depends on NF_CONNTRACK
  93
  94 config NF_CT_PROTO_SCTP
  95         tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
  96         depends on EXPERIMENTAL && NF_CONNTRACK
  97         default n
  98         help
  99           With this option enabled, the layer 3 independent connection
 100           tracking code will be able to do state tracking on SCTP connections.
 101
 102           If you want to compile it as a module, say M here and read
 103           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 104
 105 config NF_CT_PROTO_UDPLITE
 106         tristate 'UDP-Lite protocol connection tracking support (EXPERIMENTAL)'
 107         depends on EXPERIMENTAL && NF_CONNTRACK
 108         help
 109           With this option enabled, the layer 3 independent connection
 110           tracking code will be able to do state tracking on UDP-Lite
 111           connections.
 112
 113           To compile it as a module, choose M here.  If unsure, say N.
 114
 115 config NF_CONNTRACK_AMANDA
 116         tristate "Amanda backup protocol support"
 117         depends on NF_CONNTRACK
 118         select TEXTSEARCH
 119         select TEXTSEARCH_KMP
 120         help
 121           If you are running the Amanda backup package <http://www.amanda.org/>
 122           on this machine or machines that will be MASQUERADED through this
 123           machine, then you may want to enable this feature.  This allows the
 124           connection tracking and natting code to allow the sub-channels that
 125           Amanda requires for communication of the backup data, messages and
 126           index.
 127
 128           To compile it as a module, choose M here.  If unsure, say N.
 129
 130 config NF_CONNTRACK_FTP
 131         tristate "FTP protocol support"
 132         depends on NF_CONNTRACK
 133         help
 134           Tracking FTP connections is problematic: special helpers are
 135           required for tracking them, and doing masquerading and other forms
 136           of Network Address Translation on them.
 137
 138           This is FTP support on Layer 3 independent connection tracking.
 139           Layer 3 independent connection tracking is experimental scheme
 140           which generalize ip_conntrack to support other layer 3 protocols.
 141
 142           To compile it as a module, choose M here.  If unsure, say N.
 143
 144 config NF_CONNTRACK_H323
 145         tristate "H.323 protocol support (EXPERIMENTAL)"
 146         depends on EXPERIMENTAL && NF_CONNTRACK && (IPV6 || IPV6=n)
 147         help
 148           H.323 is a VoIP signalling protocol from ITU-T. As one of the most
 149           important VoIP protocols, it is widely used by voice hardware and
 150           software including voice gateways, IP phones, Netmeeting, OpenPhone,
 151           Gnomemeeting, etc.
 152
 153           With this module you can support H.323 on a connection tracking/NAT
 154           firewall.
 155
 156           This module supports RAS, Fast Start, H.245 Tunnelling, Call
 157           Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
 158           whiteboard, file transfer, etc. For more information, please
 159           visit http://nath323.sourceforge.net/.
 160
 161           To compile it as a module, choose M here.  If unsure, say N.
 162
 163 config NF_CONNTRACK_IRC
 164         tristate "IRC protocol support"
 165         depends on NF_CONNTRACK
 166         help
 167           There is a commonly-used extension to IRC called
 168           Direct Client-to-Client Protocol (DCC).  This enables users to send
 169           files to each other, and also chat to each other without the need
 170           of a server.  DCC Sending is used anywhere you send files over IRC,
 171           and DCC Chat is most commonly used by Eggdrop bots.  If you are
 172           using NAT, this extension will enable you to send files and initiate
 173           chats.  Note that you do NOT need this extension to get files or
 174           have others initiate chats, or everything else in IRC.
 175
 176           To compile it as a module, choose M here.  If unsure, say N.
 177
 178 config NF_CONNTRACK_NETBIOS_NS
 179         tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
 180         depends on EXPERIMENTAL && NF_CONNTRACK
 181         help
 182           NetBIOS name service requests are sent as broadcast messages from an
 183           unprivileged port and responded to with unicast messages to the
 184           same port. This make them hard to firewall properly because connection
 185           tracking doesn't deal with broadcasts. This helper tracks locally
 186           originating NetBIOS name service requests and the corresponding
 187           responses. It relies on correct IP address configuration, specifically
 188           netmask and broadcast address. When properly configured, the output
 189           of "ip address show" should look similar to this:
 190
 191           $ ip -4 address show eth0
 192           4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
 193               inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
 194
 195           To compile it as a module, choose M here.  If unsure, say N.
 196
 197 config NF_CONNTRACK_PPTP
 198         tristate "PPtP protocol support"
 199         depends on NF_CONNTRACK
 200         select NF_CT_PROTO_GRE
 201         help
 202           This module adds support for PPTP (Point to Point Tunnelling
 203           Protocol, RFC2637) connection tracking and NAT.
 204
 205           If you are running PPTP sessions over a stateful firewall or NAT
 206           box, you may want to enable this feature.
 207
 208           Please note that not all PPTP modes of operation are supported yet.
 209           Specifically these limitations exist:
 210             - Blindly assumes that control connections are always established
 211               in PNS->PAC direction. This is a violation of RFC2637.
 212             - Only supports a single call within each session
 213
 214           To compile it as a module, choose M here.  If unsure, say N.
 215
 216 config NF_CONNTRACK_SANE
 217         tristate "SANE protocol support (EXPERIMENTAL)"
 218         depends on EXPERIMENTAL && NF_CONNTRACK
 219         help
 220           SANE is a protocol for remote access to scanners as implemented
 221           by the 'saned' daemon. Like FTP, it uses separate control and
 222           data connections.
 223
 224           With this module you can support SANE on a connection tracking
 225           firewall.
 226
 227           To compile it as a module, choose M here.  If unsure, say N.
 228
 229 config NF_CONNTRACK_SIP
 230         tristate "SIP protocol support (EXPERIMENTAL)"
 231         depends on EXPERIMENTAL && NF_CONNTRACK
 232         help
 233           SIP is an application-layer control protocol that can establish,
 234           modify, and terminate multimedia sessions (conferences) such as
 235           Internet telephony calls. With the ip_conntrack_sip and
 236           the nf_nat_sip modules you can support the protocol on a connection
 237           tracking/NATing firewall.
 238
 239           To compile it as a module, choose M here.  If unsure, say N.
 240
 241 config NF_CONNTRACK_TFTP
 242         tristate "TFTP protocol support"
 243         depends on NF_CONNTRACK
 244         help
 245           TFTP connection tracking helper, this is required depending
 246           on how restrictive your ruleset is.
 247           If you are using a tftp client behind -j SNAT or -j MASQUERADING
 248           you will need this.
 249
 250           To compile it as a module, choose M here.  If unsure, say N.
 251
 252 config NF_CT_NETLINK
 253         tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
 254         depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
 255         depends on NF_CONNTRACK!=y || NETFILTER_NETLINK!=m
 256         depends on NF_NAT=n || NF_NAT
 257         help
 258           This option enables support for a netlink-based userspace interface
 259
 260 config NETFILTER_XTABLES
 261         tristate "Netfilter Xtables support (required for ip_tables)"
 262         help
 263           This is required if you intend to use any of ip_tables,
 264           ip6_tables or arp_tables.
 265
 266 # alphabetically ordered list of targets
 267
 268 config NETFILTER_XT_TARGET_CLASSIFY
 269         tristate '"CLASSIFY" target support'
 270         depends on NETFILTER_XTABLES
 271         help
 272           This option adds a `CLASSIFY' target, which enables the user to set
 273           the priority of a packet. Some qdiscs can use this value for
 274           classification, among these are:
 275
 276           atm, cbq, dsmark, pfifo_fast, htb, prio
 277
 278           To compile it as a module, choose M here.  If unsure, say N.
 279
 280 config NETFILTER_XT_TARGET_CONNMARK
 281         tristate  '"CONNMARK" target support'
 282         depends on NETFILTER_XTABLES
 283         depends on IP_NF_MANGLE || IP6_NF_MANGLE
 284         depends on NF_CONNTRACK
 285         select NF_CONNTRACK_MARK
 286         help
 287           This option adds a `CONNMARK' target, which allows one to manipulate
 288           the connection mark value.  Similar to the MARK target, but
 289           affects the connection mark value rather than the packet mark value.
 290
 291           If you want to compile it as a module, say M here and read
 292           <file:Documentation/kbuild/modules.txt>.  The module will be called
 293           ipt_CONNMARK.ko.  If unsure, say `N'.
 294
 295 config NETFILTER_XT_TARGET_DSCP
 296         tristate '"DSCP" target support'
 297         depends on NETFILTER_XTABLES
 298         depends on IP_NF_MANGLE || IP6_NF_MANGLE
 299         help
 300           This option adds a `DSCP' target, which allows you to manipulate
 301           the IPv4/IPv6 header DSCP field (differentiated services codepoint).
 302
 303           The DSCP field can have any value between 0x0 and 0x3f inclusive.
 304
 305           To compile it as a module, choose M here.  If unsure, say N.
 306
 307 config NETFILTER_XT_TARGET_MARK
 308         tristate '"MARK" target support'
 309         depends on NETFILTER_XTABLES
 310         help
 311           This option adds a `MARK' target, which allows you to create rules
 312           in the `mangle' table which alter the netfilter mark (nfmark) field
 313           associated with the packet prior to routing. This can change
 314           the routing method (see `Use netfilter MARK value as routing
 315           key') and can also be used by other subsystems to change their
 316           behavior.
 317
 318           To compile it as a module, choose M here.  If unsure, say N.
 319
 320 config NETFILTER_XT_TARGET_NFQUEUE
 321         tristate '"NFQUEUE" target Support'
 322         depends on NETFILTER_XTABLES
 323         help
 324           This target replaced the old obsolete QUEUE target.
 325
 326           As opposed to QUEUE, it supports 65535 different queues,
 327           not just one.
 328
 329           To compile it as a module, choose M here.  If unsure, say N.
 330
 331 config NETFILTER_XT_TARGET_NFLOG
 332         tristate '"NFLOG" target support'
 333         depends on NETFILTER_XTABLES
 334         help
 335           This option enables the NFLOG target, which allows to LOG
 336           messages through the netfilter logging API, which can use
 337           either the old LOG target, the old ULOG target or nfnetlink_log
 338           as backend.
 339
 340           To compile it as a module, choose M here.  If unsure, say N.
 341
 342 config NETFILTER_XT_TARGET_NOTRACK
 343         tristate  '"NOTRACK" target support'
 344         depends on NETFILTER_XTABLES
 345         depends on IP_NF_RAW || IP6_NF_RAW
 346         depends on NF_CONNTRACK
 347         help
 348           The NOTRACK target allows a select rule to specify
 349           which packets *not* to enter the conntrack/NAT
 350           subsystem with all the consequences (no ICMP error tracking,
 351           no protocol helpers for the selected packets).
 352
 353           If you want to compile it as a module, say M here and read
 354           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 355
 356 config NETFILTER_XT_TARGET_TRACE
 357         tristate  '"TRACE" target support'
 358         depends on NETFILTER_XTABLES
 359         depends on IP_NF_RAW || IP6_NF_RAW
 360         help
 361           The TRACE target allows you to mark packets so that the kernel
 362           will log every rule which match the packets as those traverse
 363           the tables, chains, rules.
 364
 365           If you want to compile it as a module, say M here and read
 366           <file:Documentation/modules.txt>.  If unsure, say `N'.
 367
 368 config NETFILTER_XT_TARGET_SECMARK
 369         tristate '"SECMARK" target support'
 370         depends on NETFILTER_XTABLES && NETWORK_SECMARK
 371         help
 372           The SECMARK target allows security marking of network
 373           packets, for use with security subsystems.
 374
 375           To compile it as a module, choose M here.  If unsure, say N.
 376
 377 config NETFILTER_XT_TARGET_CONNSECMARK
 378         tristate '"CONNSECMARK" target support'
 379         depends on NETFILTER_XTABLES && NF_CONNTRACK && NF_CONNTRACK_SECMARK
 380         help
 381           The CONNSECMARK target copies security markings from packets
 382           to connections, and restores security markings from connections
 383           to packets (if the packets are not already marked).  This would
 384           normally be used in conjunction with the SECMARK target.
 385
 386           To compile it as a module, choose M here.  If unsure, say N.
 387
 388 config NETFILTER_XT_TARGET_TCPMSS
 389         tristate '"TCPMSS" target support'
 390         depends on NETFILTER_XTABLES && (IPV6 || IPV6=n)
 391         ---help---
 392           This option adds a `TCPMSS' target, which allows you to alter the
 393           MSS value of TCP SYN packets, to control the maximum size for that
 394           connection (usually limiting it to your outgoing interface's MTU
 395           minus 40).
 396
 397           This is used to overcome criminally braindead ISPs or servers which
 398           block ICMP Fragmentation Needed packets.  The symptoms of this
 399           problem are that everything works fine from your Linux
 400           firewall/router, but machines behind it can never exchange large
 401           packets:
 402                 1) Web browsers connect, then hang with no data received.
 403                 2) Small mail works fine, but large emails hang.
 404                 3) ssh works fine, but scp hangs after initial handshaking.
 405
 406           Workaround: activate this option and add a rule to your firewall
 407           configuration like:
 408
 409           iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
 410                          -j TCPMSS --clamp-mss-to-pmtu
 411
 412           To compile it as a module, choose M here.  If unsure, say N.
 413
 414 config NETFILTER_XT_MATCH_COMMENT
 415         tristate  '"comment" match support'
 416         depends on NETFILTER_XTABLES
 417         help
 418           This option adds a `comment' dummy-match, which allows you to put
 419           comments in your iptables ruleset.
 420
 421           If you want to compile it as a module, say M here and read
 422           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 423
 424 config NETFILTER_XT_MATCH_CONNBYTES
 425         tristate  '"connbytes" per-connection counter match support'
 426         depends on NETFILTER_XTABLES
 427         depends on NF_CONNTRACK
 428         select NF_CT_ACCT
 429         help
 430           This option adds a `connbytes' match, which allows you to match the
 431           number of bytes and/or packets for each direction within a connection.
 432
 433           If you want to compile it as a module, say M here and read
 434           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 435
 436 config NETFILTER_XT_MATCH_CONNLIMIT
 437         tristate '"connlimit" match support"'
 438         depends on NETFILTER_XTABLES
 439         depends on NF_CONNTRACK
 440         ---help---
 441           This match allows you to match against the number of parallel
 442           connections to a server per client IP address (or address block).
 443
 444 config NETFILTER_XT_MATCH_CONNMARK
 445         tristate  '"connmark" connection mark match support'
 446         depends on NETFILTER_XTABLES
 447         depends on NF_CONNTRACK
 448         select NF_CONNTRACK_MARK
 449         help
 450           This option adds a `connmark' match, which allows you to match the
 451           connection mark value previously set for the session by `CONNMARK'.
 452
 453           If you want to compile it as a module, say M here and read
 454           <file:Documentation/kbuild/modules.txt>.  The module will be called
 455           ipt_connmark.ko.  If unsure, say `N'.
 456
 457 config NETFILTER_XT_MATCH_CONNTRACK
 458         tristate '"conntrack" connection tracking match support'
 459         depends on NETFILTER_XTABLES
 460         depends on NF_CONNTRACK
 461         help
 462           This is a general conntrack match module, a superset of the state match.
 463
 464           It allows matching on additional conntrack information, which is
 465           useful in complex configurations, such as NAT gateways with multiple
 466           internet links or tunnels.
 467
 468           To compile it as a module, choose M here.  If unsure, say N.
 469
 470 config NETFILTER_XT_MATCH_DCCP
 471         tristate  '"DCCP" protocol match support'
 472         depends on NETFILTER_XTABLES
 473         help
 474           With this option enabled, you will be able to use the iptables
 475           `dccp' match in order to match on DCCP source/destination ports
 476           and DCCP flags.
 477
 478           If you want to compile it as a module, say M here and read
 479           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 480
 481 config NETFILTER_XT_MATCH_DSCP
 482         tristate '"DSCP" match support'
 483         depends on NETFILTER_XTABLES
 484         help
 485           This option adds a `DSCP' match, which allows you to match against
 486           the IPv4/IPv6 header DSCP field (differentiated services codepoint).
 487
 488           The DSCP field can have any value between 0x0 and 0x3f inclusive.
 489
 490           To compile it as a module, choose M here.  If unsure, say N.
 491
 492 config NETFILTER_XT_MATCH_ESP
 493         tristate '"ESP" match support'
 494         depends on NETFILTER_XTABLES
 495         help
 496           This match extension allows you to match a range of SPIs
 497           inside ESP header of IPSec packets.
 498
 499           To compile it as a module, choose M here.  If unsure, say N.
 500
 501 config NETFILTER_XT_MATCH_HELPER
 502         tristate '"helper" match support'
 503         depends on NETFILTER_XTABLES
 504         depends on NF_CONNTRACK
 505         help
 506           Helper matching allows you to match packets in dynamic connections
 507           tracked by a conntrack-helper, ie. ip_conntrack_ftp
 508
 509           To compile it as a module, choose M here.  If unsure, say Y.
 510
 511 config NETFILTER_XT_MATCH_LENGTH
 512         tristate '"length" match support'
 513         depends on NETFILTER_XTABLES
 514         help
 515           This option allows you to match the length of a packet against a
 516           specific value or range of values.
 517
 518           To compile it as a module, choose M here.  If unsure, say N.
 519
 520 config NETFILTER_XT_MATCH_LIMIT
 521         tristate '"limit" match support'
 522         depends on NETFILTER_XTABLES
 523         help
 524           limit matching allows you to control the rate at which a rule can be
 525           matched: mainly useful in combination with the LOG target ("LOG
 526           target support", below) and to avoid some Denial of Service attacks.
 527
 528           To compile it as a module, choose M here.  If unsure, say N.
 529
 530 config NETFILTER_XT_MATCH_MAC
 531         tristate '"mac" address match support'
 532         depends on NETFILTER_XTABLES
 533         help
 534           MAC matching allows you to match packets based on the source
 535           Ethernet address of the packet.
 536
 537           To compile it as a module, choose M here.  If unsure, say N.
 538
 539 config NETFILTER_XT_MATCH_MARK
 540         tristate '"mark" match support'
 541         depends on NETFILTER_XTABLES
 542         help
 543           Netfilter mark matching allows you to match packets based on the
 544           `nfmark' value in the packet.  This can be set by the MARK target
 545           (see below).
 546
 547           To compile it as a module, choose M here.  If unsure, say N.
 548
 549 config NETFILTER_XT_MATCH_POLICY
 550         tristate 'IPsec "policy" match support'
 551         depends on NETFILTER_XTABLES && XFRM
 552         help
 553           Policy matching allows you to match packets based on the
 554           IPsec policy that was used during decapsulation/will
 555           be used during encapsulation.
 556
 557           To compile it as a module, choose M here.  If unsure, say N.
 558
 559 config NETFILTER_XT_MATCH_MULTIPORT
 560         tristate "Multiple port match support"
 561         depends on NETFILTER_XTABLES
 562         help
 563           Multiport matching allows you to match TCP or UDP packets based on
 564           a series of source or destination ports: normally a rule can only
 565           match a single range of ports.
 566
 567           To compile it as a module, choose M here.  If unsure, say N.
 568
 569 config NETFILTER_XT_MATCH_PHYSDEV
 570         tristate '"physdev" match support'
 571         depends on NETFILTER_XTABLES && BRIDGE && BRIDGE_NETFILTER
 572         help
 573           Physdev packet matching matches against the physical bridge ports
 574           the IP packet arrived on or will leave by.
 575
 576           To compile it as a module, choose M here.  If unsure, say N.
 577
 578 config NETFILTER_XT_MATCH_PKTTYPE
 579         tristate '"pkttype" packet type match support'
 580         depends on NETFILTER_XTABLES
 581         help
 582           Packet type matching allows you to match a packet by
 583           its "class", eg. BROADCAST, MULTICAST, ...
 584
 585           Typical usage:
 586           iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
 587
 588           To compile it as a module, choose M here.  If unsure, say N.
 589
 590 config NETFILTER_XT_MATCH_QUOTA
 591         tristate '"quota" match support'
 592         depends on NETFILTER_XTABLES
 593         help
 594           This option adds a `quota' match, which allows to match on a
 595           byte counter.
 596
 597           If you want to compile it as a module, say M here and read
 598           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 599
 600 config NETFILTER_XT_MATCH_REALM
 601         tristate  '"realm" match support'
 602         depends on NETFILTER_XTABLES
 603         select NET_CLS_ROUTE
 604         help
 605           This option adds a `realm' match, which allows you to use the realm
 606           key from the routing subsystem inside iptables.
 607
 608           This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
 609           in tc world.
 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_SCTP
 615         tristate  '"sctp" protocol match support (EXPERIMENTAL)'
 616         depends on NETFILTER_XTABLES && EXPERIMENTAL
 617         help
 618           With this option enabled, you will be able to use the
 619           `sctp' match in order to match on SCTP source/destination ports
 620           and SCTP chunk types.
 621
 622           If you want to compile it as a module, say M here and read
 623           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 624
 625 config NETFILTER_XT_MATCH_STATE
 626         tristate '"state" match support'
 627         depends on NETFILTER_XTABLES
 628         depends on NF_CONNTRACK
 629         help
 630           Connection state matching allows you to match packets based on their
 631           relationship to a tracked connection (ie. previous packets).  This
 632           is a powerful tool for packet classification.
 633
 634           To compile it as a module, choose M here.  If unsure, say N.
 635
 636 config NETFILTER_XT_MATCH_STATISTIC
 637         tristate '"statistic" match support'
 638         depends on NETFILTER_XTABLES
 639         help
 640           This option adds a `statistic' match, which allows you to match
 641           on packets periodically or randomly with a given percentage.
 642
 643           To compile it as a module, choose M here.  If unsure, say N.
 644
 645 config NETFILTER_XT_MATCH_STRING
 646         tristate  '"string" match support'
 647         depends on NETFILTER_XTABLES
 648         select TEXTSEARCH
 649         select TEXTSEARCH_KMP
 650         select TEXTSEARCH_BM
 651         select TEXTSEARCH_FSM
 652         help
 653           This option adds a `string' match, which allows you to look for
 654           pattern matchings in packets.
 655
 656           To compile it as a module, choose M here.  If unsure, say N.
 657
 658 config NETFILTER_XT_MATCH_TCPMSS
 659         tristate '"tcpmss" match support'
 660         depends on NETFILTER_XTABLES
 661         help
 662           This option adds a `tcpmss' match, which allows you to examine the
 663           MSS value of TCP SYN packets, which control the maximum packet size
 664           for that connection.
 665
 666           To compile it as a module, choose M here.  If unsure, say N.
 667
 668 config NETFILTER_XT_MATCH_U32
 669         tristate '"u32" match support'
 670         depends on NETFILTER_XTABLES
 671         ---help---
 672           u32 allows you to extract quantities of up to 4 bytes from a packet,
 673           AND them with specified masks, shift them by specified amounts and
 674           test whether the results are in any of a set of specified ranges.
 675           The specification of what to extract is general enough to skip over
 676           headers with lengths stored in the packet, as in IP or TCP header
 677           lengths.
 678
 679           Details and examples are in the kernel module source.
 680
 681 config NETFILTER_XT_MATCH_HASHLIMIT
 682         tristate '"hashlimit" match support'
 683         depends on NETFILTER_XTABLES && (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
 684         help
 685           This option adds a `hashlimit' match.
 686
 687           As opposed to `limit', this match dynamically creates a hash table
 688           of limit buckets, based on your selection of source/destination
 689           addresses and/or ports.
 690
 691           It enables you to express policies like `10kpps for any given
 692           destination address' or `500pps from any given source address'
 693           with a single rule.
 694
 695 endmenu
 696