# SPDX-License-Identifier: GPL-2.0-only
#
# IP netfilter configuration
#
menu "IP: Netfilter Configuration"
depends on INET && NETFILTER
config NF_DEFRAG_IPV4
tristate
default n
# old sockopt interface and eval loop
config IP_NF_IPTABLES_LEGACY
tristate
config NF_SOCKET_IPV4
tristate "IPv4 socket lookup support"
help
This option enables the IPv4 socket lookup infrastructure. This is
is required by the {ip,nf}tables socket match.
config NF_TPROXY_IPV4
tristate "IPv4 tproxy support"
if NF_TABLES
config NF_TABLES_IPV4
bool "IPv4 nf_tables support"
help
This option enables the IPv4 support for nf_tables.
if NF_TABLES_IPV4
config NFT_REJECT_IPV4
select NF_REJECT_IPV4
default NFT_REJECT
tristate
config NFT_DUP_IPV4
tristate "IPv4 nf_tables packet duplication support"
depends on !NF_CONNTRACK || NF_CONNTRACK
select NF_DUP_IPV4
help
This module enables IPv4 packet duplication support for nf_tables.
config NFT_FIB_IPV4
select NFT_FIB
tristate "nf_tables fib / ip route lookup support"
help
This module enables IPv4 FIB lookups, e.g. for reverse path filtering.
It also allows query of the FIB for the route type, e.g. local, unicast,
multicast or blackhole.
endif # NF_TABLES_IPV4
config NF_TABLES_ARP
bool "ARP nf_tables support"
select NETFILTER_FAMILY_ARP
help
This option enables the ARP support for nf_tables.
endif # NF_TABLES
config NF_DUP_IPV4
tristate "Netfilter IPv4 packet duplication to alternate destination"
depends on !NF_CONNTRACK || NF_CONNTRACK
help
This option enables the nf_dup_ipv4 core, which duplicates an IPv4
packet to be rerouted to another destination.
config NF_LOG_ARP
tristate "ARP packet logging"
default m if NETFILTER_ADVANCED=n
select NF_LOG_SYSLOG
help
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects CONFIG_NF_LOG_SYSLOG.
config NF_LOG_IPV4
tristate "IPv4 packet logging"
default m if NETFILTER_ADVANCED=n
select NF_LOG_SYSLOG
help
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects CONFIG_NF_LOG_SYSLOG.
config NF_REJECT_IPV4
tristate "IPv4 packet rejection"
default m if NETFILTER_ADVANCED=n
if NF_NAT
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
select ASN1
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_PPTP
tristate
depends on NF_CONNTRACK
default NF_CONNTRACK_PPTP
config NF_NAT_H323
tristate
depends on NF_CONNTRACK
default NF_CONNTRACK_H323
endif # NF_NAT
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
depends on IP_NF_MANGLE || IP_NF_RAW || NFT_COMPAT
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
select IP_NF_IPTABLES_LEGACY
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 || NFT_COMPAT
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
default m if NETFILTER_ADVANCED=n
select NF_NAT
select NETFILTER_XT_NAT
select IP_NF_IPTABLES_LEGACY
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 NETFILTER_XT_TARGET_MASQUERADE
help
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects NETFILTER_XT_TARGET_MASQUERADE.
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
select IP_NF_IPTABLES_LEGACY
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_ECN
tristate "ECN target support"
depends on IP_NF_MANGLE || NFT_COMPAT
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)'
select IP_NF_IPTABLES_LEGACY
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.rst>. If unsure, say `N'.
# security table for MAC policy
config IP_NF_SECURITY
tristate "Security table"
depends on SECURITY
depends on NETFILTER_ADVANCED
select IP_NF_IPTABLES_LEGACY
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
config NFT_COMPAT_ARP
tristate
depends on NF_TABLES_ARP && NFT_COMPAT
default m if NFT_COMPAT=m
default y if NFT_COMPAT=y
config IP_NF_ARPFILTER
tristate "arptables-legacy packet filtering support"
select IP_NF_ARPTABLES
select NETFILTER_FAMILY_ARP
depends on NETFILTER_XTABLES
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. This is only needed for arptables-legacy(8).
Neither arptables-nft nor nftables need this to work.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_ARP_MANGLE
tristate "ARP payload mangling"
depends on IP_NF_ARPTABLES || NFT_COMPAT_ARP
help
Allows altering the ARP packet payload: source and destination
hardware and network addresses.
This option is needed by both arptables-legacy and arptables-nft.
It is not used by nftables.
endmenu
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