net/ipv4/netfilter/Kconfig

   1 #
   2 # IP netfilter configuration
   3 #
   4
   5 menu "IP: Netfilter Configuration"
   6         depends on INET && NETFILTER
   7
   8 config NF_DEFRAG_IPV4
   9         tristate
  10         default n
  11
  12 config NF_CONNTRACK_IPV4
  13         tristate "IPv4 connection tracking support (required for NAT)"
  14         depends on NF_CONNTRACK
  15         default m if NETFILTER_ADVANCED=n
  16         select NF_DEFRAG_IPV4
  17         ---help---
  18           Connection tracking keeps a record of what packets have passed
  19           through your machine, in order to figure out how they are related
  20           into connections.
  21
  22           This is IPv4 support on Layer 3 independent connection tracking.
  23           Layer 3 independent connection tracking is experimental scheme
  24           which generalize ip_conntrack to support other layer 3 protocols.
  25
  26           To compile it as a module, choose M here.  If unsure, say N.
  27
  28 config NF_CONNTRACK_PROC_COMPAT
  29         bool "proc/sysctl compatibility with old connection tracking"
  30         depends on NF_CONNTRACK_PROCFS && NF_CONNTRACK_IPV4
  31         default y
  32         help
  33           This option enables /proc and sysctl compatibility with the old
  34           layer 3 dependent connection tracking. This is needed to keep
  35           old programs that have not been adapted to the new names working.
  36
  37           If unsure, say Y.
  38
  39 config NF_TABLES_IPV4
  40         depends on NF_TABLES
  41         tristate "IPv4 nf_tables support"
  42         help
  43           This option enables the IPv4 support for nf_tables.
  44
  45 config NFT_CHAIN_ROUTE_IPV4
  46         depends on NF_TABLES_IPV4
  47         tristate "IPv4 nf_tables route chain support"
  48         help
  49           This option enables the "route" chain for IPv4 in nf_tables. This
  50           chain type is used to force packet re-routing after mangling header
  51           fields such as the source, destination, type of service and
  52           the packet mark.
  53
  54 config NFT_CHAIN_NAT_IPV4
  55         depends on NF_TABLES_IPV4
  56         depends on NF_NAT_IPV4 && NFT_NAT
  57         tristate "IPv4 nf_tables nat chain support"
  58         help
  59           This option enables the "nat" chain for IPv4 in nf_tables. This
  60           chain type is used to perform Network Address Translation (NAT)
  61           packet transformations such as the source, destination address and
  62           source and destination ports.
  63
  64 config NF_TABLES_ARP
  65         depends on NF_TABLES
  66         tristate "ARP nf_tables support"
  67         help
  68           This option enables the ARP support for nf_tables.
  69
  70 config IP_NF_IPTABLES
  71         tristate "IP tables support (required for filtering/masq/NAT)"
  72         default m if NETFILTER_ADVANCED=n
  73         select NETFILTER_XTABLES
  74         help
  75           iptables is a general, extensible packet identification framework.
  76           The packet filtering and full NAT (masquerading, port forwarding,
  77           etc) subsystems now use this: say `Y' or `M' here if you want to use
  78           either of those.
  79
  80           To compile it as a module, choose M here.  If unsure, say N.
  81
  82 if IP_NF_IPTABLES
  83
  84 # The matches.
  85 config IP_NF_MATCH_AH
  86         tristate '"ah" match support'
  87         depends on NETFILTER_ADVANCED
  88         help
  89           This match extension allows you to match a range of SPIs
  90           inside AH header of IPSec packets.
  91
  92           To compile it as a module, choose M here.  If unsure, say N.
  93
  94 config IP_NF_MATCH_ECN
  95         tristate '"ecn" match support'
  96         depends on NETFILTER_ADVANCED
  97         select NETFILTER_XT_MATCH_ECN
  98         ---help---
  99         This is a backwards-compat option for the user's convenience
 100         (e.g. when running oldconfig). It selects
 101         CONFIG_NETFILTER_XT_MATCH_ECN.
 102
 103 config IP_NF_MATCH_RPFILTER
 104         tristate '"rpfilter" reverse path filter match support'
 105         depends on NETFILTER_ADVANCED && (IP_NF_MANGLE || IP_NF_RAW)
 106         ---help---
 107           This option allows you to match packets whose replies would
 108           go out via the interface the packet came in.
 109
 110           To compile it as a module, choose M here.  If unsure, say N.
 111           The module will be called ipt_rpfilter.
 112
 113 config IP_NF_MATCH_TTL
 114         tristate '"ttl" match support'
 115         depends on NETFILTER_ADVANCED
 116         select NETFILTER_XT_MATCH_HL
 117         ---help---
 118         This is a backwards-compat option for the user's convenience
 119         (e.g. when running oldconfig). It selects
 120         CONFIG_NETFILTER_XT_MATCH_HL.
 121
 122 # `filter', generic and specific targets
 123 config IP_NF_FILTER
 124         tristate "Packet filtering"
 125         default m if NETFILTER_ADVANCED=n
 126         help
 127           Packet filtering defines a table `filter', which has a series of
 128           rules for simple packet filtering at local input, forwarding and
 129           local output.  See the man page for iptables(8).
 130
 131           To compile it as a module, choose M here.  If unsure, say N.
 132
 133 config IP_NF_TARGET_REJECT
 134         tristate "REJECT target support"
 135         depends on IP_NF_FILTER
 136         default m if NETFILTER_ADVANCED=n
 137         help
 138           The REJECT target allows a filtering rule to specify that an ICMP
 139           error should be issued in response to an incoming packet, rather
 140           than silently being dropped.
 141
 142           To compile it as a module, choose M here.  If unsure, say N.
 143
 144 config IP_NF_TARGET_SYNPROXY
 145         tristate "SYNPROXY target support"
 146         depends on NF_CONNTRACK && NETFILTER_ADVANCED
 147         select NETFILTER_SYNPROXY
 148         select SYN_COOKIES
 149         help
 150           The SYNPROXY target allows you to intercept TCP connections and
 151           establish them using syncookies before they are passed on to the
 152           server. This allows to avoid conntrack and server resource usage
 153           during SYN-flood attacks.
 154
 155           To compile it as a module, choose M here. If unsure, say N.
 156
 157 config IP_NF_TARGET_ULOG
 158         tristate "ULOG target support (obsolete)"
 159         default m if NETFILTER_ADVANCED=n
 160         ---help---
 161
 162           This option enables the old IPv4-only "ipt_ULOG" implementation
 163           which has been obsoleted by the new "nfnetlink_log" code (see
 164           CONFIG_NETFILTER_NETLINK_LOG).
 165
 166           This option adds a `ULOG' target, which allows you to create rules in
 167           any iptables table. The packet is passed to a userspace logging
 168           daemon using netlink multicast sockets; unlike the LOG target
 169           which can only be viewed through syslog.
 170
 171           The appropriate userspace logging daemon (ulogd) may be obtained from
 172           <http://www.netfilter.org/projects/ulogd/index.html>
 173
 174           To compile it as a module, choose M here.  If unsure, say N.
 175
 176 # NAT + specific targets: nf_conntrack
 177 config NF_NAT_IPV4
 178         tristate "IPv4 NAT"
 179         depends on NF_CONNTRACK_IPV4
 180         default m if NETFILTER_ADVANCED=n
 181         select NF_NAT
 182         help
 183           The IPv4 NAT option allows masquerading, port forwarding and other
 184           forms of full Network Address Port Translation.  It is controlled by
 185           the `nat' table in iptables: see the man page for iptables(8).
 186
 187           To compile it as a module, choose M here.  If unsure, say N.
 188
 189 if NF_NAT_IPV4
 190
 191 config IP_NF_TARGET_MASQUERADE
 192         tristate "MASQUERADE target support"
 193         default m if NETFILTER_ADVANCED=n
 194         help
 195           Masquerading is a special case of NAT: all outgoing connections are
 196           changed to seem to come from a particular interface's address, and
 197           if the interface goes down, those connections are lost.  This is
 198           only useful for dialup accounts with dynamic IP address (ie. your IP
 199           address will be different on next dialup).
 200
 201           To compile it as a module, choose M here.  If unsure, say N.
 202
 203 config IP_NF_TARGET_NETMAP
 204         tristate "NETMAP target support"
 205         depends on NETFILTER_ADVANCED
 206         select NETFILTER_XT_TARGET_NETMAP
 207         ---help---
 208         This is a backwards-compat option for the user's convenience
 209         (e.g. when running oldconfig). It selects
 210         CONFIG_NETFILTER_XT_TARGET_NETMAP.
 211
 212 config IP_NF_TARGET_REDIRECT
 213         tristate "REDIRECT target support"
 214         depends on NETFILTER_ADVANCED
 215         select NETFILTER_XT_TARGET_REDIRECT
 216         ---help---
 217         This is a backwards-compat option for the user's convenience
 218         (e.g. when running oldconfig). It selects
 219         CONFIG_NETFILTER_XT_TARGET_REDIRECT.
 220
 221 endif
 222
 223 config NF_NAT_SNMP_BASIC
 224         tristate "Basic SNMP-ALG support"
 225         depends on NF_CONNTRACK_SNMP && NF_NAT_IPV4
 226         depends on NETFILTER_ADVANCED
 227         default NF_NAT && NF_CONNTRACK_SNMP
 228         ---help---
 229
 230           This module implements an Application Layer Gateway (ALG) for
 231           SNMP payloads.  In conjunction with NAT, it allows a network
 232           management system to access multiple private networks with
 233           conflicting addresses.  It works by modifying IP addresses
 234           inside SNMP payloads to match IP-layer NAT mapping.
 235
 236           This is the "basic" form of SNMP-ALG, as described in RFC 2962
 237
 238           To compile it as a module, choose M here.  If unsure, say N.
 239
 240 # If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
 241 # or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.
 242 # From kconfig-language.txt:
 243 #
 244 #           <expr> '&&' <expr>                   (6)
 245 #
 246 # (6) Returns the result of min(/expr/, /expr/).
 247
 248 config NF_NAT_PROTO_GRE
 249         tristate
 250         depends on NF_NAT_IPV4 && NF_CT_PROTO_GRE
 251
 252 config NF_NAT_PPTP
 253         tristate
 254         depends on NF_CONNTRACK && NF_NAT_IPV4
 255         default NF_NAT_IPV4 && NF_CONNTRACK_PPTP
 256         select NF_NAT_PROTO_GRE
 257
 258 config NF_NAT_H323
 259         tristate
 260         depends on NF_CONNTRACK && NF_NAT_IPV4
 261         default NF_NAT_IPV4 && NF_CONNTRACK_H323
 262
 263 # mangle + specific targets
 264 config IP_NF_MANGLE
 265         tristate "Packet mangling"
 266         default m if NETFILTER_ADVANCED=n
 267         help
 268           This option adds a `mangle' table to iptables: see the man page for
 269           iptables(8).  This table is used for various packet alterations
 270           which can effect how the packet is routed.
 271
 272           To compile it as a module, choose M here.  If unsure, say N.
 273
 274 config IP_NF_TARGET_CLUSTERIP
 275         tristate "CLUSTERIP target support"
 276         depends on IP_NF_MANGLE
 277         depends on NF_CONNTRACK_IPV4
 278         depends on NETFILTER_ADVANCED
 279         select NF_CONNTRACK_MARK
 280         help
 281           The CLUSTERIP target allows you to build load-balancing clusters of
 282           network servers without having a dedicated load-balancing
 283           router/server/switch.
 284
 285           To compile it as a module, choose M here.  If unsure, say N.
 286
 287 config IP_NF_TARGET_ECN
 288         tristate "ECN target support"
 289         depends on IP_NF_MANGLE
 290         depends on NETFILTER_ADVANCED
 291         ---help---
 292           This option adds a `ECN' target, which can be used in the iptables mangle
 293           table.
 294
 295           You can use this target to remove the ECN bits from the IPv4 header of
 296           an IP packet.  This is particularly useful, if you need to work around
 297           existing ECN blackholes on the internet, but don't want to disable
 298           ECN support in general.
 299
 300           To compile it as a module, choose M here.  If unsure, say N.
 301
 302 config IP_NF_TARGET_TTL
 303         tristate '"TTL" target support'
 304         depends on NETFILTER_ADVANCED && IP_NF_MANGLE
 305         select NETFILTER_XT_TARGET_HL
 306         ---help---
 307         This is a backwards-compatible option for the user's convenience
 308         (e.g. when running oldconfig). It selects
 309         CONFIG_NETFILTER_XT_TARGET_HL.
 310
 311 # raw + specific targets
 312 config IP_NF_RAW
 313         tristate  'raw table support (required for NOTRACK/TRACE)'
 314         help
 315           This option adds a `raw' table to iptables. This table is the very
 316           first in the netfilter framework and hooks in at the PREROUTING
 317           and OUTPUT chains.
 318
 319           If you want to compile it as a module, say M here and read
 320           <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 321
 322 # security table for MAC policy
 323 config IP_NF_SECURITY
 324         tristate "Security table"
 325         depends on SECURITY
 326         depends on NETFILTER_ADVANCED
 327         help
 328           This option adds a `security' table to iptables, for use
 329           with Mandatory Access Control (MAC) policy.
 330
 331           If unsure, say N.
 332
 333 endif # IP_NF_IPTABLES
 334
 335 # ARP tables
 336 config IP_NF_ARPTABLES
 337         tristate "ARP tables support"
 338         select NETFILTER_XTABLES
 339         depends on NETFILTER_ADVANCED
 340         help
 341           arptables is a general, extensible packet identification framework.
 342           The ARP packet filtering and mangling (manipulation)subsystems
 343           use this: say Y or M here if you want to use either of those.
 344
 345           To compile it as a module, choose M here.  If unsure, say N.
 346
 347 if IP_NF_ARPTABLES
 348
 349 config IP_NF_ARPFILTER
 350         tristate "ARP packet filtering"
 351         help
 352           ARP packet filtering defines a table `filter', which has a series of
 353           rules for simple ARP packet filtering at local input and
 354           local output.  On a bridge, you can also specify filtering rules
 355           for forwarded ARP packets. See the man page for arptables(8).
 356
 357           To compile it as a module, choose M here.  If unsure, say N.
 358
 359 config IP_NF_ARP_MANGLE
 360         tristate "ARP payload mangling"
 361         help
 362           Allows altering the ARP packet payload: source and destination
 363           hardware and network addresses.
 364
 365 endif # IP_NF_ARPTABLES
 366
 367 endmenu
 368