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Kconfig
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Kconfig
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menu "Core Netfilter Configuration"
depends on NET && INET && NETFILTER
config NETFILTER_NETLINK
tristate
config NETFILTER_NETLINK_ACCT
tristate "Netfilter NFACCT over NFNETLINK interface"
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK
help
If this option is enabled, the kernel will include support
for extended accounting via NFNETLINK.
config NETFILTER_NETLINK_QUEUE
tristate "Netfilter NFQUEUE over NFNETLINK interface"
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK
help
If this option is enabled, the kernel will include support
for queueing packets via NFNETLINK.
config NETFILTER_NETLINK_LOG
tristate "Netfilter LOG over NFNETLINK interface"
default m if NETFILTER_ADVANCED=n
select NETFILTER_NETLINK
help
If this option is enabled, the kernel will include support
for logging packets via NFNETLINK.
This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
and is also scheduled to replace the old syslog-based ipt_LOG
and ip6t_LOG modules.
config NF_CONNTRACK
tristate "Netfilter connection tracking support"
default m if NETFILTER_ADVANCED=n
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 required to do Masquerading or other kinds of Network
Address Translation. It can also be used to enhance packet
filtering (see `Connection state match support' below).
To compile it as a module, choose M here. If unsure, say N.
if NF_CONNTRACK
config NF_CONNTRACK_MARK
bool 'Connection mark tracking support'
depends on NETFILTER_ADVANCED
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 NF_CONNTRACK_SECMARK
bool 'Connection tracking security mark support'
depends on NETWORK_SECMARK
default m if NETFILTER_ADVANCED=n
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 NF_CONNTRACK_ZONES
bool 'Connection tracking zones'
depends on NETFILTER_ADVANCED
depends on NETFILTER_XT_TARGET_CT
help
This option enables support for connection tracking zones.
Normally, each connection needs to have a unique system wide
identity. Connection tracking zones allow to have multiple
connections using the same identity, as long as they are
contained in different zones.
If unsure, say `N'.
config NF_CONNTRACK_PROCFS
bool "Supply CT list in procfs (OBSOLETE)"
default y
depends on PROC_FS
---help---
This option enables for the list of known conntrack entries
to be shown in procfs under net/netfilter/nf_conntrack. This
is considered obsolete in favor of using the conntrack(8)
tool which uses Netlink.
config NF_CONNTRACK_EVENTS
bool "Connection tracking events"
depends on NETFILTER_ADVANCED
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 NF_CONNTRACK_TIMEOUT
bool 'Connection tracking timeout'
depends on NETFILTER_ADVANCED
help
This option enables support for connection tracking timeout
extension. This allows you to attach timeout policies to flow
via the CT target.
If unsure, say `N'.
config NF_CONNTRACK_TIMESTAMP
bool 'Connection tracking timestamping'
depends on NETFILTER_ADVANCED
help
This option enables support for connection tracking timestamping.
This allows you to store the flow start-time and to obtain
the flow-stop time (once it has been destroyed) via Connection
tracking events.
If unsure, say `N'.
config NF_CT_PROTO_DCCP
tristate 'DCCP protocol connection tracking support (EXPERIMENTAL)'
depends on EXPERIMENTAL
depends on NETFILTER_ADVANCED
default IP_DCCP
help
With this option enabled, the layer 3 independent connection
tracking code will be able to do state tracking on DCCP connections.
If unsure, say 'N'.
config NF_CT_PROTO_GRE
tristate
config NF_CT_PROTO_SCTP
tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
depends on EXPERIMENTAL
depends on NETFILTER_ADVANCED
default IP_SCTP
help
With this option enabled, the layer 3 independent 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/kbuild/modules.txt>. If unsure, say `N'.
config NF_CT_PROTO_UDPLITE
tristate 'UDP-Lite protocol connection tracking support'
depends on NETFILTER_ADVANCED
help
With this option enabled, the layer 3 independent connection
tracking code will be able to do state tracking on UDP-Lite
connections.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_AMANDA
tristate "Amanda backup protocol support"
depends on NETFILTER_ADVANCED
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 N.
config NF_CONNTRACK_FTP
tristate "FTP protocol support"
default m if NETFILTER_ADVANCED=n
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.
This is FTP 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_H323
tristate "H.323 protocol support"
depends on (IPV6 || IPV6=n)
depends on NETFILTER_ADVANCED
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/.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_IRC
tristate "IRC protocol support"
default m if NETFILTER_ADVANCED=n
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 N.
config NF_CONNTRACK_BROADCAST
tristate
config NF_CONNTRACK_NETBIOS_NS
tristate "NetBIOS name service protocol support"
select NF_CONNTRACK_BROADCAST
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 NF_CONNTRACK_SNMP
tristate "SNMP service protocol support"
depends on NETFILTER_ADVANCED
select NF_CONNTRACK_BROADCAST
help
SNMP 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 SNMP service requests and the corresponding
responses. It relies on correct IP address configuration, specifically
netmask and broadcast address.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_PPTP
tristate "PPtP protocol support"
depends on NETFILTER_ADVANCED
select NF_CT_PROTO_GRE
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.
Specifically these limitations exist:
- Blindly assumes that control connections are always established
in PNS->PAC direction. This is a violation of RFC2637.
- Only supports a single call within each session
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_SANE
tristate "SANE protocol support (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on NETFILTER_ADVANCED
help
SANE is a protocol for remote access to scanners as implemented
by the 'saned' daemon. Like FTP, it uses separate control and
data connections.
With this module you can support SANE on a connection tracking
firewall.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_SIP
tristate "SIP protocol support"
default m if NETFILTER_ADVANCED=n
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 nf_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 N.
config NF_CONNTRACK_TFTP
tristate "TFTP protocol support"
depends on NETFILTER_ADVANCED
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 N.
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface'
select NETFILTER_NETLINK
default m if NETFILTER_ADVANCED=n
help
This option enables support for a netlink-based userspace interface
config NF_CT_NETLINK_TIMEOUT
tristate 'Connection tracking timeout tuning via Netlink'
select NETFILTER_NETLINK
depends on NETFILTER_ADVANCED
help
This option enables support for connection tracking timeout
fine-grain tuning. This allows you to attach specific timeout
policies to flows, instead of using the global timeout policy.
If unsure, say `N'.
config NF_CT_NETLINK_HELPER
tristate 'Connection tracking helpers in user-space via Netlink'
select NETFILTER_NETLINK
depends on NF_CT_NETLINK
depends on NETFILTER_NETLINK_QUEUE
depends on NETFILTER_NETLINK_QUEUE_CT
depends on NETFILTER_ADVANCED
help
This option enables the user-space connection tracking helpers
infrastructure.
If unsure, say `N'.
config NETFILTER_NETLINK_QUEUE_CT
bool "NFQUEUE integration with Connection Tracking"
default n
depends on NETFILTER_NETLINK_QUEUE
help
If this option is enabled, NFQUEUE can include Connection Tracking
information together with the packet is the enqueued via NFNETLINK.
config NF_NAT
tristate
config NF_NAT_NEEDED
bool
depends on NF_NAT
default y
config NF_NAT_PROTO_DCCP
tristate
depends on NF_NAT && NF_CT_PROTO_DCCP
default NF_NAT && NF_CT_PROTO_DCCP
config NF_NAT_PROTO_UDPLITE
tristate
depends on NF_NAT && NF_CT_PROTO_UDPLITE
default NF_NAT && NF_CT_PROTO_UDPLITE
config NF_NAT_PROTO_SCTP
tristate
default NF_NAT && NF_CT_PROTO_SCTP
depends on NF_NAT && NF_CT_PROTO_SCTP
select LIBCRC32C
config NF_NAT_AMANDA
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_AMANDA
config NF_NAT_FTP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_FTP
config NF_NAT_IRC
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_IRC
config NF_NAT_SIP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_SIP
config NF_NAT_TFTP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_TFTP
endif # NF_CONNTRACK
# transparent proxy support
config NETFILTER_TPROXY
tristate "Transparent proxying support (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on IP_NF_MANGLE
depends on NETFILTER_ADVANCED
help
This option enables transparent proxying support, that is,
support for handling non-locally bound IPv4 TCP and UDP sockets.
For it to work you will have to configure certain iptables rules
and use policy routing. For more information on how to set it up
see Documentation/networking/tproxy.txt.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XTABLES
tristate "Netfilter Xtables support (required for ip_tables)"
default m if NETFILTER_ADVANCED=n
help
This is required if you intend to use any of ip_tables,
ip6_tables or arp_tables.
if NETFILTER_XTABLES
comment "Xtables combined modules"
config NETFILTER_XT_MARK
tristate 'nfmark target and match support'
default m if NETFILTER_ADVANCED=n
---help---
This option adds the "MARK" target and "mark" match.
Netfilter mark matching allows you to match packets based on the
"nfmark" value in the packet.
The target allows you to create rules in the "mangle" table which alter
the netfilter mark (nfmark) field associated with the packet.
Prior to routing, the nfmark can influence the routing method (see
"Use netfilter MARK value as routing key") and can also be used by
other subsystems to change their behavior.
config NETFILTER_XT_CONNMARK
tristate 'ctmark target and match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NF_CONNTRACK_MARK
---help---
This option adds the "CONNMARK" target and "connmark" match.
Netfilter allows you to store a mark value per connection (a.k.a.
ctmark), similarly to the packet mark (nfmark). Using this
target and match, you can set and match on this mark.
config NETFILTER_XT_SET
tristate 'set target and match support'
depends on IP_SET
depends on NETFILTER_ADVANCED
help
This option adds the "SET" target and "set" match.
Using this target and match, you can add/delete and match
elements in the sets created by ipset(8).
To compile it as a module, choose M here. If unsure, say N.
# alphabetically ordered list of targets
comment "Xtables targets"
config NETFILTER_XT_TARGET_AUDIT
tristate "AUDIT target support"
depends on AUDIT
depends on NETFILTER_ADVANCED
---help---
This option adds a 'AUDIT' target, which can be used to create
audit records for packets dropped/accepted.
To compileit as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_CHECKSUM
tristate "CHECKSUM target support"
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NETFILTER_ADVANCED
---help---
This option adds a `CHECKSUM' target, which can be used in the iptables mangle
table.
You can use this target to compute and fill in the checksum in
a packet that lacks a checksum. This is particularly useful,
if you need to work around old applications such as dhcp clients,
that do not work well with checksum offloads, but don't want to disable
checksum offload in your device.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_CLASSIFY
tristate '"CLASSIFY" target support'
depends on NETFILTER_ADVANCED
help
This option adds a `CLASSIFY' target, which enables the user to set
the priority of a packet. Some qdiscs can use this value for
classification, among these are:
atm, cbq, dsmark, pfifo_fast, htb, prio
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_CONNMARK
tristate '"CONNMARK" target support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NETFILTER_XT_CONNMARK
---help---
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects
CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
config NETFILTER_XT_TARGET_CONNSECMARK
tristate '"CONNSECMARK" target support'
depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
default m if NETFILTER_ADVANCED=n
help
The CONNSECMARK target copies security markings from packets
to connections, and restores security markings from connections
to packets (if the packets are not already marked). This would
normally be used in conjunction with the SECMARK target.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_CT
tristate '"CT" target support'
depends on NF_CONNTRACK
depends on IP_NF_RAW || IP6_NF_RAW
depends on NETFILTER_ADVANCED
help
This options adds a `CT' target, which allows to specify initial
connection tracking parameters like events to be delivered and
the helper to be used.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_DSCP
tristate '"DSCP" and "TOS" target support'
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NETFILTER_ADVANCED
help
This option adds a `DSCP' target, which allows you to manipulate
the IPv4/IPv6 header DSCP field (differentiated services codepoint).
The DSCP field can have any value between 0x0 and 0x3f inclusive.
It also adds the "TOS" target, which allows you to create rules in
the "mangle" table which alter the Type Of Service field of an IPv4
or the Priority field of an IPv6 packet, prior to routing.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_HL
tristate '"HL" hoplimit target support'
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NETFILTER_ADVANCED
---help---
This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
targets, which enable the user to change the
hoplimit/time-to-live value of the IP header.
While it is safe to decrement the hoplimit/TTL value, the
modules also allow to increment and set the hoplimit value of
the header to arbitrary values. This is EXTREMELY DANGEROUS
since you can easily create immortal packets that loop
forever on the network.
config NETFILTER_XT_TARGET_HMARK
tristate '"HMARK" target support'
depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
depends on NETFILTER_ADVANCED
---help---
This option adds the "HMARK" target.
The target allows you to create rules in the "raw" and "mangle" tables
which set the skbuff mark by means of hash calculation within a given
range. The nfmark can influence the routing method (see "Use netfilter
MARK value as routing key") and can also be used by other subsystems to
change their behaviour.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_IDLETIMER
tristate "IDLETIMER target support"
depends on NETFILTER_ADVANCED
help
This option adds the `IDLETIMER' target. Each matching packet
resets the timer associated with label specified when the rule is
added. When the timer expires, it triggers a sysfs notification.
The remaining time for expiration can be read via sysfs.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_LED
tristate '"LED" target support'
depends on LEDS_CLASS && LEDS_TRIGGERS
depends on NETFILTER_ADVANCED
help
This option adds a `LED' target, which allows you to blink LEDs in
response to particular packets passing through your machine.
This can be used to turn a spare LED into a network activity LED,
which only flashes in response to FTP transfers, for example. Or
you could have an LED which lights up for a minute or two every time
somebody connects to your machine via SSH.
You will need support for the "led" class to make this work.
To create an LED trigger for incoming SSH traffic:
iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
Then attach the new trigger to an LED on your system:
echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
For more information on the LEDs available on your system, see
Documentation/leds/leds-class.txt
config NETFILTER_XT_TARGET_LOG
tristate "LOG target support"
default m if NETFILTER_ADVANCED=n
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 NETFILTER_XT_TARGET_MARK
tristate '"MARK" target support'
depends on NETFILTER_ADVANCED
select NETFILTER_XT_MARK
---help---
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects
CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
config NETFILTER_XT_TARGET_NETMAP
tristate '"NETMAP" target support'
depends on 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.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_NFLOG
tristate '"NFLOG" target support'
default m if NETFILTER_ADVANCED=n
select NETFILTER_NETLINK_LOG
help
This option enables the NFLOG target, which allows to LOG
messages through nfnetlink_log.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_NFQUEUE
tristate '"NFQUEUE" target Support'
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK_QUEUE
help
This target replaced the old obsolete QUEUE target.
As opposed to QUEUE, it supports 65535 different queues,
not just one.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_NOTRACK
tristate '"NOTRACK" target support (DEPRECATED)'
depends on NF_CONNTRACK
depends on IP_NF_RAW || IP6_NF_RAW
depends on NETFILTER_ADVANCED
select NETFILTER_XT_TARGET_CT
config NETFILTER_XT_TARGET_RATEEST
tristate '"RATEEST" target support'
depends on NETFILTER_ADVANCED
help
This option adds a `RATEEST' target, which allows to measure
rates similar to TC estimators. The `rateest' match can be
used to match on the measured rates.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_REDIRECT
tristate "REDIRECT target support"
depends on 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 NETFILTER_XT_TARGET_TEE
tristate '"TEE" - packet cloning to alternate destination'
depends on NETFILTER_ADVANCED
depends on (IPV6 || IPV6=n)
depends on !NF_CONNTRACK || NF_CONNTRACK
---help---
This option adds a "TEE" target with which a packet can be cloned and
this clone be rerouted to another nexthop.
config NETFILTER_XT_TARGET_TPROXY
tristate '"TPROXY" target support (EXPERIMENTAL)'
depends on EXPERIMENTAL
depends on NETFILTER_TPROXY
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
select NF_DEFRAG_IPV4
select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
help
This option adds a `TPROXY' target, which is somewhat similar to
REDIRECT. It can only be used in the mangle table and is useful
to redirect traffic to a transparent proxy. It does _not_ depend
on Netfilter connection tracking and NAT, unlike REDIRECT.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_TRACE
tristate '"TRACE" target support'
depends on IP_NF_RAW || IP6_NF_RAW
depends on NETFILTER_ADVANCED
help
The TRACE target allows you to mark packets so that the kernel
will log every rule which match the packets as those traverse
the tables, chains, rules.
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
config NETFILTER_XT_TARGET_SECMARK
tristate '"SECMARK" target support'
depends on NETWORK_SECMARK
default m if NETFILTER_ADVANCED=n
help
The SECMARK target allows security marking of network
packets, for use with security subsystems.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_TCPMSS
tristate '"TCPMSS" target support'
depends on (IPV6 || IPV6=n)
default m if NETFILTER_ADVANCED=n
---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.
config NETFILTER_XT_TARGET_TCPOPTSTRIP
tristate '"TCPOPTSTRIP" target support (EXPERIMENTAL)'
depends on EXPERIMENTAL
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NETFILTER_ADVANCED
help
This option adds a "TCPOPTSTRIP" target, which allows you to strip
TCP options from TCP packets.
# alphabetically ordered list of matches
comment "Xtables matches"
config NETFILTER_XT_MATCH_ADDRTYPE
tristate '"addrtype" address type match support'
depends on NETFILTER_ADVANCED
---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/kbuild/modules.txt>. If unsure, say `N'.
config NETFILTER_XT_MATCH_CLUSTER
tristate '"cluster" match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
---help---
This option allows you to build work-load-sharing clusters of
network servers/stateful firewalls without having a dedicated
load-balancing router/server/switch. Basically, this match returns
true when the packet must be handled by this cluster node. Thus,
all nodes see all packets and this match decides which node handles
what packets. The work-load sharing algorithm is based on source
address hashing.
If you say Y or M here, try `iptables -m cluster --help` for
more information.
config NETFILTER_XT_MATCH_COMMENT
tristate '"comment" match support'
depends on NETFILTER_ADVANCED
help
This option adds a `comment' dummy-match, which allows you to put
comments in your iptables ruleset.
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
config NETFILTER_XT_MATCH_CONNBYTES
tristate '"connbytes" per-connection counter match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
help
This option adds a `connbytes' match, which allows you to match the
number of bytes and/or packets for each direction within a connection.
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
config NETFILTER_XT_MATCH_CONNLIMIT
tristate '"connlimit" match support"'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
---help---
This match allows you to match against the number of parallel
connections to a server per client IP address (or address block).
config NETFILTER_XT_MATCH_CONNMARK
tristate '"connmark" connection mark match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NETFILTER_XT_CONNMARK
---help---
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects
CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
config NETFILTER_XT_MATCH_CONNTRACK
tristate '"conntrack" connection tracking match support'
depends on NF_CONNTRACK
default m if NETFILTER_ADVANCED=n
help
This is a general conntrack match module, a superset of the state match.
It allows matching on additional conntrack information, which is
useful in complex configurations, such as NAT gateways with multiple
internet links or tunnels.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_CPU
tristate '"cpu" match support'
depends on NETFILTER_ADVANCED
help
CPU matching allows you to match packets based on the CPU
currently handling the packet.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_DCCP
tristate '"dccp" protocol match support'
depends on NETFILTER_ADVANCED
default IP_DCCP
help
With this option enabled, you will be able to use the iptables
`dccp' match in order to match on DCCP source/destination ports
and DCCP flags.
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
config NETFILTER_XT_MATCH_DEVGROUP
tristate '"devgroup" match support'
depends on NETFILTER_ADVANCED
help
This options adds a `devgroup' match, which allows to match on the
device group a network device is assigned to.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_DSCP
tristate '"dscp" and "tos" match support'
depends on NETFILTER_ADVANCED
help
This option adds a `DSCP' match, which allows you to match against
the IPv4/IPv6 header DSCP field (differentiated services codepoint).
The DSCP field can have any value between 0x0 and 0x3f inclusive.
It will also add a "tos" match, which allows you to match packets
based on the Type Of Service fields of the IPv4 packet (which share
the same bits as DSCP).
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_ECN
tristate '"ecn" match support'
depends on NETFILTER_ADVANCED
---help---
This option adds an "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 NETFILTER_XT_MATCH_ESP
tristate '"esp" match support'
depends on NETFILTER_ADVANCED
help
This match extension allows you to match a range of SPIs
inside ESP header of IPSec packets.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_HASHLIMIT
tristate '"hashlimit" match support'
depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
depends on NETFILTER_ADVANCED
help
This option adds a `hashlimit' match.
As opposed to `limit', this match dynamically creates a hash table
of limit buckets, based on your selection of source/destination
addresses and/or ports.
It enables you to express policies like `10kpps for any given
destination address' or `500pps from any given source address'
with a single rule.
config NETFILTER_XT_MATCH_HELPER
tristate '"helper" match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
help
Helper matching allows you to match packets in dynamic connections
tracked by a conntrack-helper, ie. ip_conntrack_ftp
To compile it as a module, choose M here. If unsure, say Y.
config NETFILTER_XT_MATCH_HL
tristate '"hl" hoplimit/TTL match support'
depends on NETFILTER_ADVANCED
---help---
HL matching allows you to match packets based on the hoplimit
in the IPv6 header, or the time-to-live field in the IPv4
header of the packet.
config NETFILTER_XT_MATCH_IPRANGE
tristate '"iprange" address range match support'
depends on NETFILTER_ADVANCED
---help---
This option adds a "iprange" match, which allows you to match based on
an IP address range. (Normal iptables only matches on single addresses
with an optional mask.)
If unsure, say M.
config NETFILTER_XT_MATCH_IPVS
tristate '"ipvs" match support'
depends on IP_VS
depends on NETFILTER_ADVANCED
depends on NF_CONNTRACK
help
This option allows you to match against IPVS properties of a packet.
If unsure, say N.
config NETFILTER_XT_MATCH_LENGTH
tristate '"length" match support'
depends on NETFILTER_ADVANCED
help
This option allows you to match the length of a packet against a
specific value or range of values.
To compile it as a module, choose M here. If unsure, say N.