xref: /linux-6.15/net/ipv6/netfilter/Kconfig (revision 6c959fd5)

# SPDX-License-Identifier: GPL-2.0-only
#
# IP netfilter configuration
#

menu "IPv6: Netfilter Configuration"
	depends on INET && IPV6 && NETFILTER

# old sockopt interface and eval loop
config IP6_NF_IPTABLES_LEGACY
	tristate "Legacy IP6 tables support"
	depends on INET && IPV6
	select NETFILTER_XTABLES
	default n
	help
	  ip6tables is a legacy packet classifier.
	  This is not needed if you are using iptables over nftables
	  (iptables-nft).

config NF_SOCKET_IPV6
	tristate "IPv6 socket lookup support"
	help
	  This option enables the IPv6 socket lookup infrastructure. This
	  is used by the {ip6,nf}tables socket match.

config NF_TPROXY_IPV6
	tristate "IPv6 tproxy support"

if NF_TABLES

config NF_TABLES_IPV6
	bool "IPv6 nf_tables support"
	help
	  This option enables the IPv6 support for nf_tables.

if NF_TABLES_IPV6

config NFT_REJECT_IPV6
	select NF_REJECT_IPV6
	default NFT_REJECT
	tristate

config NFT_DUP_IPV6
	tristate "IPv6 nf_tables packet duplication support"
	depends on !NF_CONNTRACK || NF_CONNTRACK
	select NF_DUP_IPV6
	help
	  This module enables IPv6 packet duplication support for nf_tables.

config NFT_FIB_IPV6
	tristate "nf_tables fib / ipv6 route lookup support"
	select NFT_FIB
	help
	  This module enables IPv6 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_IPV6
endif # NF_TABLES

config NF_DUP_IPV6
	tristate "Netfilter IPv6 packet duplication to alternate destination"
	depends on !NF_CONNTRACK || NF_CONNTRACK
	help
	  This option enables the nf_dup_ipv6 core, which duplicates an IPv6
	  packet to be rerouted to another destination.

config NF_REJECT_IPV6
	tristate "IPv6 packet rejection"
	default m if NETFILTER_ADVANCED=n

config NF_LOG_IPV6
	tristate "IPv6 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 IP6_NF_IPTABLES
	tristate "IP6 tables support (required for filtering)"
	depends on INET && IPV6
	select NETFILTER_XTABLES
	default m if NETFILTER_ADVANCED=n
	help
	  ip6tables is a general, extensible packet identification framework.
	  Currently only the packet filtering and packet mangling subsystem
	  for IPv6 use this, but connection tracking is going to follow.
	  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 IP6_NF_IPTABLES

# The simple matches.
config IP6_NF_MATCH_AH
	tristate '"ah" match support'
	depends on NETFILTER_ADVANCED
	help
	  This module allows one to match AH packets.

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

config IP6_NF_MATCH_EUI64
	tristate '"eui64" address check'
	depends on NETFILTER_ADVANCED
	help
	  This module performs checking on the IPv6 source address
	  Compares the last 64 bits with the EUI64 (delivered
	  from the MAC address) address

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

config IP6_NF_MATCH_FRAG
	tristate '"frag" Fragmentation header match support'
	depends on NETFILTER_ADVANCED
	help
	  frag matching allows you to match packets based on the fragmentation
	  header of the packet.

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

config IP6_NF_MATCH_OPTS
	tristate '"hbh" hop-by-hop and "dst" opts header match support'
	depends on NETFILTER_ADVANCED
	help
	  This allows one to match packets based on the hop-by-hop
	  and destination options headers of a packet.

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

config IP6_NF_MATCH_HL
	tristate '"hl" hoplimit 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.

config IP6_NF_MATCH_IPV6HEADER
	tristate '"ipv6header" IPv6 Extension Headers Match'
	default m if NETFILTER_ADVANCED=n
	help
	  This module allows one to match packets based upon
	  the ipv6 extension headers.

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

config IP6_NF_MATCH_MH
	tristate '"mh" match support'
	depends on NETFILTER_ADVANCED
	help
	  This module allows one to match MH packets.

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

config IP6_NF_MATCH_RPFILTER
	tristate '"rpfilter" reverse path filter match support'
	depends on NETFILTER_ADVANCED
	depends on IP6_NF_MANGLE || IP6_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 ip6t_rpfilter.

config IP6_NF_MATCH_RT
	tristate '"rt" Routing header match support'
	depends on NETFILTER_ADVANCED
	help
	  rt matching allows you to match packets based on the routing
	  header of the packet.

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

config IP6_NF_MATCH_SRH
	tristate '"srh" Segment Routing header match support'
	depends on NETFILTER_ADVANCED
	help
	  srh matching allows you to match packets based on the segment
	  routing header of the packet.

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

# The targets
config IP6_NF_TARGET_HL
	tristate '"HL" hoplimit target support'
	depends on NETFILTER_ADVANCED && IP6_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.

config IP6_NF_FILTER
	tristate "Packet filtering"
	default m if NETFILTER_ADVANCED=n
	select IP6_NF_IPTABLES_LEGACY
	tristate
	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 IP6_NF_TARGET_REJECT
	tristate "REJECT target support"
	depends on IP6_NF_FILTER || NFT_COMPAT
	select NF_REJECT_IPV6
	default m if NETFILTER_ADVANCED=n
	help
	  The REJECT target allows a filtering rule to specify that an ICMPv6
	  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 IP6_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.

config IP6_NF_MANGLE
	tristate "Packet mangling"
	default m if NETFILTER_ADVANCED=n
	select IP6_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 IP6_NF_RAW
	tristate  'raw table support (required for TRACE)'
	select IP6_NF_IPTABLES_LEGACY
	help
	  This option adds a `raw' table to ip6tables. 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 IP6_NF_SECURITY
	tristate "Security table"
	depends on SECURITY
	depends on NETFILTER_ADVANCED
	select IP6_NF_IPTABLES_LEGACY
	help
	  This option adds a `security' table to iptables, for use
	  with Mandatory Access Control (MAC) policy.

	  If unsure, say N.

config IP6_NF_NAT
	tristate "ip6tables NAT support"
	depends on NF_CONNTRACK
	depends on NETFILTER_ADVANCED
	select NF_NAT
	select IP6_NF_IPTABLES_LEGACY
	select NETFILTER_XT_NAT
	help
	  This enables the `nat' table in ip6tables. 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.

config IP6_NF_TARGET_MASQUERADE
	tristate "MASQUERADE target support"
	select NETFILTER_XT_TARGET_MASQUERADE
	depends on IP6_NF_NAT
	help
	  This is a backwards-compat option for the user's convenience
	  (e.g. when running oldconfig). It selects NETFILTER_XT_TARGET_MASQUERADE.

config IP6_NF_TARGET_NPT
	tristate "NPT (Network Prefix translation) target support"
	depends on IP6_NF_NAT || NFT_COMPAT
	help
	  This option adds the `SNPT' and `DNPT' target, which perform
	  stateless IPv6-to-IPv6 Network Prefix Translation per RFC 6296.

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

endif # IP6_NF_IPTABLES
endmenu

config NF_DEFRAG_IPV6
	tristate