xref: /net/ipv4/netfilter/Kconfig

#
# IP netfilter configuration
#

menu "IP: Netfilter Configuration"
	depends on INET && NETFILTER

config NF_DEFRAG_IPV4
	tristate
	default n

config NF_CONNTRACK_IPV4
	tristate "IPv4 connection tracking support (required for NAT)"
	depends on NF_CONNTRACK
	default m if NETFILTER_ADVANCED=n
	select NF_DEFRAG_IPV4
	---help---
	  Connection tracking keeps a record of what packets have passed
	  through your machine, in order to figure out how they are related
	  into connections.

	  This is IPv4 support on Layer 3 independent connection tracking.
	  Layer 3 independent connection tracking is experimental scheme
	  which generalize ip_conntrack to support other layer 3 protocols.

	  To compile it as a module, choose M here.  If unsure, say N.

config NF_CONNTRACK_PROC_COMPAT
	bool "proc/sysctl compatibility with old connection tracking"
	depends on NF_CONNTRACK_PROCFS && NF_CONNTRACK_IPV4
	default y
	help
	  This option enables /proc and sysctl compatibility with the old
	  layer 3 dependent connection tracking. This is needed to keep
	  old programs that have not been adapted to the new names working.

	  If unsure, say Y.

config NF_LOG_ARP
	tristate "ARP packet logging"
	default m if NETFILTER_ADVANCED=n
	select NF_LOG_COMMON

config NF_LOG_IPV4
	tristate "IPv4 packet logging"
	default m if NETFILTER_ADVANCED=n
	select NF_LOG_COMMON

config NF_TABLES_IPV4
	depends on NF_TABLES
	tristate "IPv4 nf_tables support"
	help
	  This option enables the IPv4 support for nf_tables.

config NFT_CHAIN_ROUTE_IPV4
	depends on NF_TABLES_IPV4
	tristate "IPv4 nf_tables route chain support"
	help
	  This option enables the "route" chain for IPv4 in nf_tables. This
	  chain type is used to force packet re-routing after mangling header
	  fields such as the source, destination, type of service and
	  the packet mark.

config NF_REJECT_IPV4
	tristate "IPv4 packet rejection"
	default m if NETFILTER_ADVANCED=n

config NFT_REJECT_IPV4
	depends on NF_TABLES_IPV4
	select NF_REJECT_IPV4
	default NFT_REJECT
	tristate

config NF_TABLES_ARP
	depends on NF_TABLES
	tristate "ARP nf_tables support"
	help
	  This option enables the ARP support for nf_tables.

config NF_NAT_IPV4
	tristate "IPv4 NAT"
	depends on NF_CONNTRACK_IPV4
	default m if NETFILTER_ADVANCED=n
	select NF_NAT
	help
	  The IPv4 NAT option allows masquerading, port forwarding and other
	  forms of full Network Address Port Translation. This can be
	  controlled by iptables or nft.

if NF_NAT_IPV4

config NFT_CHAIN_NAT_IPV4
	depends on NF_TABLES_IPV4
	tristate "IPv4 nf_tables nat chain support"
	help
	  This option enables the "nat" chain for IPv4 in nf_tables. This
	  chain type is used to perform Network Address Translation (NAT)
	  packet transformations such as the source, destination address and
	  source and destination ports.

config NF_NAT_MASQUERADE_IPV4
	tristate "IPv4 masquerade support"
	help
	  This is the kernel functionality to provide NAT in the masquerade
	  flavour (automatic source address selection).

config NFT_MASQ_IPV4
	tristate "IPv4 masquerading support for nf_tables"
	depends on NF_TABLES_IPV4
	depends on NFT_MASQ
	select NF_NAT_MASQUERADE_IPV4
	help
	  This is the expression that provides IPv4 masquerading support for
	  nf_tables.

config NF_NAT_SNMP_BASIC
	tristate "Basic SNMP-ALG support"
	depends on NF_CONNTRACK_SNMP
	depends on NETFILTER_ADVANCED
	default NF_NAT && NF_CONNTRACK_SNMP
	---help---

	  This module implements an Application Layer Gateway (ALG) for
	  SNMP payloads.  In conjunction with NAT, it allows a network
	  management system to access multiple private networks with
	  conflicting addresses.  It works by modifying IP addresses
	  inside SNMP payloads to match IP-layer NAT mapping.

	  This is the "basic" form of SNMP-ALG, as described in RFC 2962

	  To compile it as a module, choose M here.  If unsure, say N.

config NF_NAT_PROTO_GRE
	tristate
	depends on NF_CT_PROTO_GRE

config NF_NAT_PPTP
	tristate
	depends on NF_CONNTRACK
	default NF_CONNTRACK_PPTP
	select NF_NAT_PROTO_GRE

config NF_NAT_H323
	tristate
	depends on NF_CONNTRACK
	default NF_CONNTRACK_H323

endif # NF_NAT_IPV4

config IP_NF_IPTABLES
	tristate "IP tables support (required for filtering/masq/NAT)"
	default m if NETFILTER_ADVANCED=n
	select NETFILTER_XTABLES
	help
	  iptables is a general, extensible packet identification framework.
	  The packet filtering and full NAT (masquerading, port forwarding,
	  etc) subsystems now use this: say `Y' or `M' here if you want to use
	  either of those.

	  To compile it as a module, choose M here.  If unsure, say N.

if IP_NF_IPTABLES

# The matches.
config IP_NF_MATCH_AH
	tristate '"ah" match support'
	depends on NETFILTER_ADVANCED
	help
	  This match extension allows you to match a range of SPIs
	  inside AH header of IPSec packets.

	  To compile it as a module, choose M here.  If unsure, say N.

config IP_NF_MATCH_ECN
	tristate '"ecn" match support'
	depends on NETFILTER_ADVANCED
	select NETFILTER_XT_MATCH_ECN
	---help---
	This is a backwards-compat option for the user's convenience
	(e.g. when running oldconfig). It selects
	CONFIG_NETFILTER_XT_MATCH_ECN.

config IP_NF_MATCH_RPFILTER
	tristate '"rpfilter" reverse path filter match support'
	depends on NETFILTER_ADVANCED && (IP_NF_MANGLE || IP_NF_RAW)
	---help---
	  This option allows you to match packets whose replies would
	  go out via the interface the packet came in.

	  To compile it as a module, choose M here.  If unsure, say N.
	  The module will be called ipt_rpfilter.

config IP_NF_MATCH_TTL
	tristate '"ttl" match support'
	depends on NETFILTER_ADVANCED
	select NETFILTER_XT_MATCH_HL
	---help---
	This is a backwards-compat option for the user's convenience
	(e.g. when running oldconfig). It selects
	CONFIG_NETFILTER_XT_MATCH_HL.

# `filter', generic and specific targets
config IP_NF_FILTER
	tristate "Packet filtering"
	default m if NETFILTER_ADVANCED=n
	help
	  Packet filtering defines a table `filter', which has a series of
	  rules for simple packet filtering at local input, forwarding and
	  local output.  See the man page for iptables(8).

	  To compile it as a module, choose M here.  If unsure, say N.

config IP_NF_TARGET_REJECT
	tristate "REJECT target support"
	depends on IP_NF_FILTER
	select NF_REJECT_IPV4
	default m if NETFILTER_ADVANCED=n
	help
	  The REJECT target allows a filtering rule to specify that an ICMP
	  error should be issued in response to an incoming packet, rather
	  than silently being dropped.

	  To compile it as a module, choose M here.  If unsure, say N.

config IP_NF_TARGET_SYNPROXY
	tristate "SYNPROXY target support"
	depends on NF_CONNTRACK && NETFILTER_ADVANCED
	select NETFILTER_SYNPROXY
	select SYN_COOKIES
	help
	  The SYNPROXY target allows you to intercept TCP connections and
	  establish them using syncookies before they are passed on to the
	  server. This allows to avoid conntrack and server resource usage
	  during SYN-flood attacks.

	  To compile it as a module, choose M here. If unsure, say N.

# NAT + specific targets: nf_conntrack
config IP_NF_NAT
	tristate "iptables NAT support"
	depends on NF_CONNTRACK_IPV4
	default m if NETFILTER_ADVANCED=n
	select NF_NAT
	select NF_NAT_IPV4
	select NETFILTER_XT_NAT
	help
	  This enables the `nat' table in iptables. This allows masquerading,
	  port forwarding and other forms of full Network Address Port
	  Translation.

	  To compile it as a module, choose M here.  If unsure, say N.

if IP_NF_NAT

config IP_NF_TARGET_MASQUERADE
	tristate "MASQUERADE target support"
	select NF_NAT_MASQUERADE_IPV4
	default m if NETFILTER_ADVANCED=n
	help
	  Masquerading is a special case of NAT: all outgoing connections are
	  changed to seem to come from a particular interface's address, and
	  if the interface goes down, those connections are lost.  This is
	  only useful for dialup accounts with dynamic IP address (ie. your IP
	  address will be different on next dialup).

	  To compile it as a module, choose M here.  If unsure, say N.

config IP_NF_TARGET_NETMAP
	tristate "NETMAP target support"
	depends on NETFILTER_ADVANCED
	select NETFILTER_XT_TARGET_NETMAP
	---help---
	This is a backwards-compat option for the user's convenience
	(e.g. when running oldconfig). It selects
	CONFIG_NETFILTER_XT_TARGET_NETMAP.

config IP_NF_TARGET_REDIRECT
	tristate "REDIRECT target support"
	depends on NETFILTER_ADVANCED
	select NETFILTER_XT_TARGET_REDIRECT
	---help---
	This is a backwards-compat option for the user's convenience
	(e.g. when running oldconfig). It selects
	CONFIG_NETFILTER_XT_TARGET_REDIRECT.

endif # IP_NF_NAT

# mangle + specific targets
config IP_NF_MANGLE
	tristate "Packet mangling"
	default m if NETFILTER_ADVANCED=n
	help
	  This option adds a `mangle' table to iptables: see the man page for
	  iptables(8).  This table is used for various packet alterations
	  which can effect how the packet is routed.

	  To compile it as a module, choose M here.  If unsure, say N.

config IP_NF_TARGET_CLUSTERIP
	tristate "CLUSTERIP target support"
	depends on IP_NF_MANGLE
	depends on NF_CONNTRACK_IPV4
	depends on NETFILTER_ADVANCED
	select NF_CONNTRACK_MARK
	help
	  The CLUSTERIP target allows you to build load-balancing clusters of
	  network servers without having a dedicated load-balancing
	  router/server/switch.
	
	  To compile it as a module, choose M here.  If unsure, say N.

config IP_NF_TARGET_ECN
	tristate "ECN target support"
	depends on IP_NF_MANGLE
	depends on NETFILTER_ADVANCED
	---help---
	  This option adds a `ECN' target, which can be used in the iptables mangle
	  table.  

	  You can use this target to remove the ECN bits from the IPv4 header of
	  an IP packet.  This is particularly useful, if you need to work around
	  existing ECN blackholes on the internet, but don't want to disable
	  ECN support in general.

	  To compile it as a module, choose M here.  If unsure, say N.

config IP_NF_TARGET_TTL
	tristate '"TTL" target support'
	depends on NETFILTER_ADVANCED && IP_NF_MANGLE
	select NETFILTER_XT_TARGET_HL
	---help---
	This is a backwards-compatible option for the user's convenience
	(e.g. when running oldconfig). It selects
	CONFIG_NETFILTER_XT_TARGET_HL.

# raw + specific targets
config IP_NF_RAW
	tristate  'raw table support (required for NOTRACK/TRACE)'
	help
	  This option adds a `raw' table to iptables. This table is the very
	  first in the netfilter framework and hooks in at the PREROUTING
	  and OUTPUT chains.
	
	  If you want to compile it as a module, say M here and read
	  <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.

# security table for MAC policy
config IP_NF_SECURITY
	tristate "Security table"
	depends on SECURITY
	depends on NETFILTER_ADVANCED
	help
	  This option adds a `security' table to iptables, for use
	  with Mandatory Access Control (MAC) policy.
	 
	  If unsure, say N.

endif # IP_NF_IPTABLES

# ARP tables
config IP_NF_ARPTABLES
	tristate "ARP tables support"
	select NETFILTER_XTABLES
	depends on NETFILTER_ADVANCED
	help
	  arptables is a general, extensible packet identification framework.
	  The ARP packet filtering and mangling (manipulation)subsystems
	  use this: say Y or M here if you want to use either of those.

	  To compile it as a module, choose M here.  If unsure, say N.

if IP_NF_ARPTABLES

config IP_NF_ARPFILTER
	tristate "ARP packet filtering"
	help
	  ARP packet filtering defines a table `filter', which has a series of
	  rules for simple ARP packet filtering at local input and
	  local output.  On a bridge, you can also specify filtering rules
	  for forwarded ARP packets. See the man page for arptables(8).

	  To compile it as a module, choose M here.  If unsure, say N.

config IP_NF_ARP_MANGLE
	tristate "ARP payload mangling"
	help
	  Allows altering the ARP packet payload: source and destination
	  hardware and network addresses.

endif # IP_NF_ARPTABLES

endmenu