[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables

[safe/jmp/linux-2.6] / net / ipv4 / netfilter / Kconfig

#
# IP netfilter configuration
#

menu "IP: Netfilter Configuration"
        depends on INET && NETFILTER

config NF_CONNTRACK_IPV4
        tristate "IPv4 support for new connection tracking (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.

# connection tracking, helpers and protocols
config IP_NF_CONNTRACK
        tristate "Connection tracking (required for masq/NAT)"
        ---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 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_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
        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
        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_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_MULTIPORT
        tristate "Multiple port match support"
        depends on IP_NF_IPTABLES
        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 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_DSCP
        tristate "DSCP match support"
        depends on IP_NF_IPTABLES
        help
          This option adds a `DSCP' match, which allows you to match against
          the IPv4 header DSCP field (DSCP codepoint).

          The DSCP codepoint can have any value between 0x0 and 0x4f.

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

config IP_NF_MATCH_AH_ESP
        tristate "AH/ESP match support"
        depends on IP_NF_IPTABLES
        help
          These two match extensions (`ah' and `esp') allow you to match a
          range of SPIs inside AH or ESP headers 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'.

config IP_NF_MATCH_HASHLIMIT
        tristate  'hashlimit match support'
        depends on IP_NF_IPTABLES
        help
          This option adds a new iptables `hashlimit' match.  

          As opposed to `limit', this match dynamically crates a hash table
          of limit buckets, based on your selection of source/destination
          ip addresses and/or ports.

          It enables you to express policies like `10kpps for any given
          destination IP' or `500pps from any given source IP'  with a single
          IPtables rule.

config IP_NF_MATCH_POLICY
       tristate "IPsec policy match support"
       depends on IP_NF_IPTABLES && XFRM
       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.

# `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 (OBSOLETE)"
        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 apropriate 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
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.

config IP_NF_NAT_NEEDED
        bool
        depends on IP_NF_NAT != n
        default y

config IP_NF_TARGET_MASQUERADE
        tristate "MASQUERADE target support"
        depends on 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 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 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 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.

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

# If they want FTP, set to $CONFIG_IP_NF_NAT (m or y), 
# or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.  Argh.
config IP_NF_NAT_FTP
        tristate
        depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
        default IP_NF_NAT if IP_NF_FTP=y
        default m if IP_NF_FTP=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 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

# 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_DSCP
        tristate "DSCP target support"
        depends on IP_NF_MANGLE
        help
          This option adds a `DSCP' match, which allows you to match against
          the IPv4 header DSCP field (DSCP codepoint).

          The DSCP codepoint can have any value between 0x0 and 0x4f.

          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