#
# IP netfilter configuration
#
menu "IP: Netfilter Configuration"
depends on INET && NETFILTER
config NF_CONNTRACK_IPV4
tristate "IPv4 support for new connection tracking (required for NAT) (EXPERIMENTAL)"
depends on EXPERIMENTAL && NF_CONNTRACK
---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_IPV4
default y
help
This option enables /proc and sysctl compatibility with the old
layer 3 dependant connection tracking. This is needed to keep
old programs that have not been adapted to the new names working.
If unsure, say Y.
# connection tracking, helpers and protocols
config IP_NF_CT_ACCT
bool "Connection tracking flow accounting"
depends on IP_NF_CONNTRACK
help
If this option is enabled, the connection tracking code will
keep per-flow packet and byte counters.
Those counters can be used for flow-based accounting or the
`connbytes' match.
If unsure, say `N'.
config IP_NF_CONNTRACK_MARK
bool 'Connection mark tracking support'
depends on IP_NF_CONNTRACK
help
This option enables support for connection marks, used by the
`CONNMARK' target and `connmark' match. Similar to the mark value
of packets, but this mark value is kept in the conntrack session
instead of the individual packets.
config IP_NF_CONNTRACK_SECMARK
bool 'Connection tracking security mark support'
depends on IP_NF_CONNTRACK && NETWORK_SECMARK
help
This option enables security markings to be applied to
connections. Typically they are copied to connections from
packets using the CONNSECMARK target and copied back from
connections to packets with the same target, with the packets
being originally labeled via SECMARK.
If unsure, say 'N'.
config IP_NF_CONNTRACK_EVENTS
bool "Connection tracking events (EXPERIMENTAL)"
depends on EXPERIMENTAL && IP_NF_CONNTRACK
help
If this option is enabled, the connection tracking code will
provide a notifier chain that can be used by other kernel code
to get notified about changes in the connection tracking state.
IF unsure, say `N'.
config IP_NF_CONNTRACK_NETLINK
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
depends on EXPERIMENTAL && IP_NF_CONNTRACK && NETFILTER_NETLINK
depends on IP_NF_CONNTRACK!=y || NETFILTER_NETLINK!=m
depends on IP_NF_NAT=n || IP_NF_NAT
help
This option enables support for a netlink-based userspace interface
config IP_NF_CT_PROTO_SCTP
tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
depends on IP_NF_CONNTRACK && EXPERIMENTAL
help
With this option enabled, the connection tracking code will
be able to do state tracking on SCTP connections.
If you want to compile it as a module, say M here and read
<file:Documentation/modules.txt>. If unsure, say `N'.
config IP_NF_FTP
tristate "FTP protocol support"
depends on IP_NF_CONNTRACK
help
Tracking FTP connections is problematic: special helpers are
required for tracking them, and doing masquerading and other forms
of Network Address Translation on them.
To compile it as a module, choose M here. If unsure, say Y.
config IP_NF_IRC
tristate "IRC protocol support"
depends on IP_NF_CONNTRACK
---help---
There is a commonly-used extension to IRC called
Direct Client-to-Client Protocol (DCC). This enables users to send
files to each other, and also chat to each other without the need
of a server. DCC Sending is used anywhere you send files over IRC,
and DCC Chat is most commonly used by Eggdrop bots. If you are
using NAT, this extension will enable you to send files and initiate
chats. Note that you do NOT need this extension to get files or
have others initiate chats, or everything else in IRC.
To compile it as a module, choose M here. If unsure, say Y.
config IP_NF_NETBIOS_NS
tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
depends on IP_NF_CONNTRACK && EXPERIMENTAL
help
NetBIOS name service requests are sent as broadcast messages from an
unprivileged port and responded to with unicast messages to the
same port. This make them hard to firewall properly because connection
tracking doesn't deal with broadcasts. This helper tracks locally
originating NetBIOS name service requests and the corresponding
responses. It relies on correct IP address configuration, specifically
netmask and broadcast address. When properly configured, the output
of "ip address show" should look similar to this:
$ ip -4 address show eth0
4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_TFTP
tristate "TFTP protocol support"
depends on IP_NF_CONNTRACK
help
TFTP connection tracking helper, this is required depending
on how restrictive your ruleset is.
If you are using a tftp client behind -j SNAT or -j MASQUERADING
you will need this.
To compile it as a module, choose M here. If unsure, say Y.
config IP_NF_AMANDA
tristate "Amanda backup protocol support"
depends on IP_NF_CONNTRACK
select TEXTSEARCH
select TEXTSEARCH_KMP
help
If you are running the Amanda backup package <http://www.amanda.org/>
on this machine or machines that will be MASQUERADED through this
machine, then you may want to enable this feature. This allows the
connection tracking and natting code to allow the sub-channels that
Amanda requires for communication of the backup data, messages and
index.
To compile it as a module, choose M here. If unsure, say Y.
config IP_NF_PPTP
tristate 'PPTP protocol support'
depends on IP_NF_CONNTRACK
help
This module adds support for PPTP (Point to Point Tunnelling
Protocol, RFC2637) connection tracking and NAT.
If you are running PPTP sessions over a stateful firewall or NAT
box, you may want to enable this feature.
Please note that not all PPTP modes of operation are supported yet.
For more info, read top of the file
net/ipv4/netfilter/ip_conntrack_pptp.c
If you want to compile it as a module, say M here and read
Documentation/modules.txt. If unsure, say `N'.
config IP_NF_H323
tristate 'H.323 protocol support (EXPERIMENTAL)'
depends on IP_NF_CONNTRACK && EXPERIMENTAL
help
H.323 is a VoIP signalling protocol from ITU-T. As one of the most
important VoIP protocols, it is widely used by voice hardware and
software including voice gateways, IP phones, Netmeeting, OpenPhone,
Gnomemeeting, etc.
With this module you can support H.323 on a connection tracking/NAT
firewall.
This module supports RAS, Fast Start, H.245 Tunnelling, Call
Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
whiteboard, file transfer, etc. For more information, please
visit http://nath323.sourceforge.net/.
If you want to compile it as a module, say 'M' here and read
Documentation/modules.txt. If unsure, say 'N'.
config IP_NF_SIP
tristate "SIP protocol support (EXPERIMENTAL)"
depends on IP_NF_CONNTRACK && EXPERIMENTAL
help
SIP is an application-layer control protocol that can establish,
modify, and terminate multimedia sessions (conferences) such as
Internet telephony calls. With the ip_conntrack_sip and
the ip_nat_sip modules you can support the protocol on a connection
tracking/NATing firewall.
To compile it as a module, choose M here. If unsure, say Y.
config IP_NF_QUEUE
tristate "IP Userspace queueing via NETLINK (OBSOLETE)"
help
Netfilter has the ability to queue packets to user space: the
netlink device can be used to access them using this driver.
This option enables the old IPv4-only "ip_queue" implementation
which has been obsoleted by the new "nfnetlink_queue" code (see
CONFIG_NETFILTER_NETLINK_QUEUE).
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_IPTABLES
tristate "IP tables support (required for filtering/masq/NAT)"
depends on 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.
# The matches.
config IP_NF_MATCH_IPRANGE
tristate "IP range match support"
depends on IP_NF_IPTABLES
help
This option makes possible to match IP addresses against IP address
ranges.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_MATCH_TOS
tristate "TOS match support"
depends on IP_NF_IPTABLES
help
TOS matching allows you to match packets based on the Type Of
Service fields of the IP packet.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_MATCH_RECENT
tristate "recent match support"
depends on IP_NF_IPTABLES
help
This match is used for creating one or many lists of recently
used addresses and then matching against that/those list(s).
Short options are available by using 'iptables -m recent -h'
Official Website: <http://snowman.net/projects/ipt_recent/>
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_MATCH_ECN
tristate "ECN match support"
depends on IP_NF_IPTABLES
help
This option adds a `ECN' match, which allows you to match against
the IPv4 and TCP header ECN fields.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_MATCH_AH
tristate "AH match support"
depends on IP_NF_IPTABLES
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_TTL
tristate "TTL match support"
depends on IP_NF_IPTABLES
help
This adds CONFIG_IP_NF_MATCH_TTL option, which enabled the user
to match packets by their TTL value.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_MATCH_OWNER
tristate "Owner match support"
depends on IP_NF_IPTABLES
help
Packet owner matching allows you to match locally-generated packets
based on who created them: the user, group, process or session.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_MATCH_ADDRTYPE
tristate 'address type match support'
depends on IP_NF_IPTABLES
help
This option allows you to match what routing thinks of an address,
eg. UNICAST, LOCAL, BROADCAST, ...
If you want to compile it as a module, say M here and read
<file:Documentation/modules.txt>. If unsure, say `N'.
# `filter', generic and specific targets
config IP_NF_FILTER
tristate "Packet filtering"
depends on IP_NF_IPTABLES
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
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_LOG
tristate "LOG target support"
depends on IP_NF_IPTABLES
help
This option adds a `LOG' target, which allows you to create rules in
any iptables table which records the packet header to the syslog.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_TARGET_ULOG
tristate "ULOG target support"
depends on IP_NF_IPTABLES
---help---
This option enables the old IPv4-only "ipt_ULOG" implementation
which has been obsoleted by the new "nfnetlink_log" code (see
CONFIG_NETFILTER_NETLINK_LOG).
This option adds a `ULOG' target, which allows you to create rules in
any iptables table. The packet is passed to a userspace logging
daemon using netlink multicast sockets; unlike the LOG target
which can only be viewed through syslog.
The appropriate userspace logging daemon (ulogd) may be obtained from
<http://www.gnumonks.org/projects/ulogd/>
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_TARGET_TCPMSS
tristate "TCPMSS target support"
depends on IP_NF_IPTABLES
---help---
This option adds a `TCPMSS' target, which allows you to alter the
MSS value of TCP SYN packets, to control the maximum size for that
connection (usually limiting it to your outgoing interface's MTU
minus 40).
This is used to overcome criminally braindead ISPs or servers which
block ICMP Fragmentation Needed packets. The symptoms of this
problem are that everything works fine from your Linux
firewall/router, but machines behind it can never exchange large
packets:
1) Web browsers connect, then hang with no data received.
2) Small mail works fine, but large emails hang.
3) ssh works fine, but scp hangs after initial handshaking.
Workaround: activate this option and add a rule to your firewall
configuration like:
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
-j TCPMSS --clamp-mss-to-pmtu
To compile it as a module, choose M here. If unsure, say N.
# NAT + specific targets: ip_conntrack
config IP_NF_NAT
tristate "Full NAT"
depends on IP_NF_IPTABLES && IP_NF_CONNTRACK
help
The Full NAT option allows masquerading, port forwarding and other
forms of full Network Address Port Translation. It is controlled by
the `nat' table in iptables: see the man page for iptables(8).
To compile it as a module, choose M here. If unsure, say N.
# NAT + specific targets: nf_conntrack
config NF_NAT
tristate "Full NAT"
depends on IP_NF_IPTABLES && NF_CONNTRACK
help
The Full NAT option allows masquerading, port forwarding and other
forms of full Network Address Port Translation. It is controlled by
the `nat' table in iptables: see the man page for iptables(8).
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_NAT_NEEDED
bool
depends on IP_NF_NAT
default y
config NF_NAT_NEEDED
bool
depends on NF_NAT
default y
config IP_NF_TARGET_MASQUERADE
tristate "MASQUERADE target support"
depends on (NF_NAT || IP_NF_NAT)
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_REDIRECT
tristate "REDIRECT target support"
depends on (NF_NAT || IP_NF_NAT)
help
REDIRECT is a special case of NAT: all incoming connections are
mapped onto the incoming interface's address, causing the packets to
come to the local machine instead of passing through. This is
useful for transparent proxies.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_TARGET_NETMAP
tristate "NETMAP target support"
depends on (NF_NAT || IP_NF_NAT)
help
NETMAP is an implementation of static 1:1 NAT mapping of network
addresses. It maps the network address part, while keeping the host
address part intact. It is similar to Fast NAT, except that
Netfilter's connection tracking doesn't work well with Fast NAT.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_TARGET_SAME
tristate "SAME target support"
depends on (NF_NAT || IP_NF_NAT)
help
This option adds a `SAME' target, which works like the standard SNAT
target, but attempts to give clients the same IP for all connections.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_NAT_SNMP_BASIC
tristate "Basic SNMP-ALG support (EXPERIMENTAL)"
depends on EXPERIMENTAL && IP_NF_NAT
---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.
# If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
# or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.
# From kconfig-language.txt:
#
# <expr> '&&' <expr> (6)
#
# (6) Returns the result of min(/expr/, /expr/).
config IP_NF_NAT_FTP
tristate
depends on IP_NF_IPTABLES && IP_NF_CONNTRACK && IP_NF_NAT
default IP_NF_NAT && IP_NF_FTP
config NF_NAT_FTP
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_FTP
config IP_NF_NAT_IRC
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
default IP_NF_NAT if IP_NF_IRC=y
default m if IP_NF_IRC=m
config IP_NF_NAT_TFTP
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
default IP_NF_NAT if IP_NF_TFTP=y
default m if IP_NF_TFTP=m
config IP_NF_NAT_AMANDA
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
default IP_NF_NAT if IP_NF_AMANDA=y
default m if IP_NF_AMANDA=m
config NF_NAT_AMANDA
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_AMANDA
config IP_NF_NAT_PPTP
tristate
depends on IP_NF_NAT!=n && IP_NF_PPTP!=n
default IP_NF_NAT if IP_NF_PPTP=y
default m if IP_NF_PPTP=m
config IP_NF_NAT_H323
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
default IP_NF_NAT if IP_NF_H323=y
default m if IP_NF_H323=m
config IP_NF_NAT_SIP
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
default IP_NF_NAT if IP_NF_SIP=y
default m if IP_NF_SIP=m
# mangle + specific targets
config IP_NF_MANGLE
tristate "Packet mangling"
depends on IP_NF_IPTABLES
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_TOS
tristate "TOS target support"
depends on IP_NF_MANGLE
help
This option adds a `TOS' target, which allows you to create rules in
the `mangle' table which alter the Type Of Service field of an IP
packet prior to routing.
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
---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 IP_NF_MANGLE
help
This option adds a `TTL' target, which enables the user to modify
the TTL value of the IP header.
While it is safe to decrement/lower the TTL, this target also enables
functionality to increment and set the TTL value of the IP header to
arbitrary values. This is EXTREMELY DANGEROUS since you can easily
create immortal packets that loop forever on the network.
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_TARGET_CLUSTERIP
tristate "CLUSTERIP target support (EXPERIMENTAL)"
depends on IP_NF_MANGLE && EXPERIMENTAL
depends on (IP_NF_CONNTRACK && IP_NF_CONNTRACK_MARK) || (NF_CONNTRACK_MARK && NF_CONNTRACK_IPV4)
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.
# raw + specific targets
config IP_NF_RAW
tristate 'raw table support (required for NOTRACK/TRACE)'
depends on IP_NF_IPTABLES
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/modules.txt>. If unsure, say `N'.
# ARP tables
config IP_NF_ARPTABLES
tristate "ARP tables support"
depends on NETFILTER_XTABLES
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.
config IP_NF_ARPFILTER
tristate "ARP packet filtering"
depends on IP_NF_ARPTABLES
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"
depends on IP_NF_ARPTABLES
help
Allows altering the ARP packet payload: source and destination
hardware and network addresses.
endmenu
