menu "Core Netfilter Configuration"
depends on NET && INET && NETFILTER
config NETFILTER_NETLINK
tristate
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 (except for Fast NAT). 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.
config NF_CT_ACCT
bool "Connection tracking flow accounting"
depends on NETFILTER_ADVANCED
depends on 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 NF_CONNTRACK_MARK
bool 'Connection mark tracking support'
depends on NETFILTER_ADVANCED
depends on 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 NF_CONNTRACK_SECMARK
bool 'Connection tracking security mark support'
depends on NF_CONNTRACK && 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_EVENTS
bool "Connection tracking events"
depends on NF_CONNTRACK
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_CT_PROTO_GRE
tristate
depends on NF_CONNTRACK
config NF_CT_PROTO_SCTP
tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK
depends on NETFILTER_ADVANCED
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 NF_CONNTRACK
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 NF_CONNTRACK
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"
depends on NF_CONNTRACK
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 NF_CONNTRACK && (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"
depends on NF_CONNTRACK
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_NETBIOS_NS
tristate "NetBIOS name service protocol support"
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
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_PPTP
tristate "PPtP protocol support"
depends on NF_CONNTRACK
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 && NF_CONNTRACK
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"
depends on NF_CONNTRACK
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 NF_CONNTRACK
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'
depends on NF_CONNTRACK
select NETFILTER_NETLINK
depends on NF_NAT=n || NF_NAT
default m if NETFILTER_ADVANCED=n
help
This option enables support for a netlink-based userspace interface
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.
# alphabetically ordered list of targets
config NETFILTER_XT_TARGET_CLASSIFY
tristate '"CLASSIFY" target support'
depends on NETFILTER_XTABLES
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 NETFILTER_XTABLES
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NF_CONNTRACK_MARK
help
This option adds a `CONNMARK' target, which allows one to manipulate
the connection mark value. Similar to the MARK target, but
affects the connection mark value rather than the packet mark value.
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. The module will be called
ipt_CONNMARK.ko. If unsure, say `N'.
config NETFILTER_XT_TARGET_DSCP
tristate '"DSCP" and "TOS" target support'
depends on NETFILTER_XTABLES
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_MARK
tristate '"MARK" target support'
depends on NETFILTER_XTABLES
default m if NETFILTER_ADVANCED=n
help
This option adds a `MARK' target, which allows you to create rules
in the `mangle' table which alter the netfilter mark (nfmark) field
associated with the packet prior to routing. This can change
the routing method (see `Use netfilter MARK value as routing
key') and can also be used by other subsystems to change their
behavior.
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_XTABLES
depends on NETFILTER_ADVANCED
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_NFLOG
tristate '"NFLOG" target support'
depends on NETFILTER_XTABLES
default m if NETFILTER_ADVANCED=n
help
This option enables the NFLOG target, which allows to LOG
messages through the netfilter logging API, which can use
either the old LOG target, the old ULOG target or nfnetlink_log
as backend.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_NOTRACK
tristate '"NOTRACK" target support'
depends on NETFILTER_XTABLES
depends on IP_NF_RAW || IP6_NF_RAW
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
help
The NOTRACK target allows a select rule to specify
which packets *not* to enter the conntrack/NAT
subsystem with all the consequences (no ICMP error tracking,
no protocol helpers for the selected packets).
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_RATEEST
tristate '"RATEEST" target support'
depends on NETFILTER_XTABLES
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_TRACE
tristate '"TRACE" target support'
depends on NETFILTER_XTABLES
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 NETFILTER_XTABLES && 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_CONNSECMARK
tristate '"CONNSECMARK" target support'
depends on NETFILTER_XTABLES && 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_TCPMSS
tristate '"TCPMSS" target support'
depends on NETFILTER_XTABLES && (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 && NETFILTER_XTABLES
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.
config NETFILTER_XT_MATCH_COMMENT
tristate '"comment" match support'
depends on NETFILTER_XTABLES
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 NETFILTER_XTABLES
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NF_CT_ACCT
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 NETFILTER_XTABLES
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 NETFILTER_XTABLES
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NF_CONNTRACK_MARK
help
This option adds a `connmark' match, which allows you to match the
connection mark value previously set for the session by `CONNMARK'.
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. The module will be called
ipt_connmark.ko. If unsure, say `N'.
config NETFILTER_XT_MATCH_CONNTRACK
tristate '"conntrack" connection tracking match support'
depends on NETFILTER_XTABLES
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_DCCP
tristate '"dccp" protocol match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
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_DSCP
tristate '"dscp" and "tos" match support'
depends on NETFILTER_XTABLES
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_ESP
tristate '"esp" match support'
depends on NETFILTER_XTABLES
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_HELPER
tristate '"helper" match support'
depends on NETFILTER_XTABLES
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_IPRANGE
tristate '"iprange" address range match support'
depends on NETFILTER_XTABLES
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_LENGTH
tristate '"length" match support'
depends on NETFILTER_XTABLES
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.
config NETFILTER_XT_MATCH_LIMIT
tristate '"limit" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
help
limit matching allows you to control the rate at which a rule can be
matched: mainly useful in combination with the LOG target ("LOG
target support", below) and to avoid some Denial of Service attacks.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_MAC
tristate '"mac" address match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
help
MAC matching allows you to match packets based on the source
Ethernet address of the packet.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_MARK
tristate '"mark" match support'
depends on NETFILTER_XTABLES
default m if NETFILTER_ADVANCED=n
help
Netfilter mark matching allows you to match packets based on the
`nfmark' value in the packet. This can be set by the MARK target
(see below).
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_OWNER
tristate '"owner" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
---help---
Socket owner matching allows you to match locally-generated packets
based on who created the socket: the user or group. It is also
possible to check whether a socket actually exists.
config NETFILTER_XT_MATCH_POLICY
tristate 'IPsec "policy" match support'
depends on NETFILTER_XTABLES && XFRM
default m if NETFILTER_ADVANCED=n
help
Policy matching allows you to match packets based on the
IPsec policy that was used during decapsulation/will
be used during encapsulation.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_MULTIPORT
tristate '"multiport" Multiple port match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
help
Multiport matching allows you to match TCP or UDP packets based on
a series of source or destination ports: normally a rule can only
match a single range of ports.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_PHYSDEV
tristate '"physdev" match support'
depends on NETFILTER_XTABLES && BRIDGE && BRIDGE_NETFILTER
depends on NETFILTER_ADVANCED
help
Physdev packet matching matches against the physical bridge ports
the IP packet arrived on or will leave by.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_PKTTYPE
tristate '"pkttype" packet type match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
help
Packet type matching allows you to match a packet by
its "class", eg. BROADCAST, MULTICAST, ...
Typical usage:
iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_QUOTA
tristate '"quota" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
help
This option adds a `quota' match, which allows to match on a
byte counter.
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_RATEEST
tristate '"rateest" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
select NETFILTER_XT_TARGET_RATEEST
help
This option adds a `rateest' match, which allows to match on the
rate estimated by the RATEEST target.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_REALM
tristate '"realm" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
select NET_CLS_ROUTE
help
This option adds a `realm' match, which allows you to use the realm
key from the routing subsystem inside iptables.
This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
in tc world.
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_SCTP
tristate '"sctp" protocol match support (EXPERIMENTAL)'
depends on NETFILTER_XTABLES && EXPERIMENTAL
depends on NETFILTER_ADVANCED
help
With this option enabled, you will be able to use the
`sctp' match in order to match on SCTP source/destination ports
and SCTP chunk types.
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_STATE
tristate '"state" match support'
depends on NETFILTER_XTABLES
depends on NF_CONNTRACK
default m if NETFILTER_ADVANCED=n
help
Connection state matching allows you to match packets based on their
relationship to a tracked connection (ie. previous packets). This
is a powerful tool for packet classification.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_STATISTIC
tristate '"statistic" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
help
This option adds a `statistic' match, which allows you to match
on packets periodically or randomly with a given percentage.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_STRING
tristate '"string" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
select TEXTSEARCH
select TEXTSEARCH_KMP
select TEXTSEARCH_BM
select TEXTSEARCH_FSM
help
This option adds a `string' match, which allows you to look for
pattern matchings in packets.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_TCPMSS
tristate '"tcpmss" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
help
This option adds a `tcpmss' match, which allows you to examine the
MSS value of TCP SYN packets, which control the maximum packet size
for that connection.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_TIME
tristate '"time" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
---help---
This option adds a "time" match, which allows you to match based on
the packet arrival time (at the machine which netfilter is running)
on) or departure time/date (for locally generated packets).
If you say Y here, try `iptables -m time --help` for
more information.
If you want to compile it as a module, say M here.
If unsure, say N.
config NETFILTER_XT_MATCH_U32
tristate '"u32" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
---help---
u32 allows you to extract quantities of up to 4 bytes from a packet,
AND them with specified masks, shift them by specified amounts and
test whether the results are in any of a set of specified ranges.
The specification of what to extract is general enough to skip over
headers with lengths stored in the packet, as in IP or TCP header
lengths.
Details and examples are in the kernel module source.
config NETFILTER_XT_MATCH_HASHLIMIT
tristate '"hashlimit" match support'
depends on NETFILTER_XTABLES && (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.
endmenu
