1b50b8a371
Along comes... xt_u32, a revamped ipt_u32 from POM-NG,
Plus:
* 2007-06-02: added ipv6 support
* 2007-06-05: uses kmalloc for the big buffer
* 2007-06-05: added inversion
* 2007-06-20: use skb_copy_bits() and get rid of the big buffer
and lock (suggested by Pablo Neira Ayuso)
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
667 lines
23 KiB
Plaintext
667 lines
23 KiB
Plaintext
menu "Core Netfilter Configuration"
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depends on NET && INET && NETFILTER
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config NETFILTER_NETLINK
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tristate "Netfilter netlink interface"
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help
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If this option is enabled, the kernel will include support
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for the new netfilter netlink interface.
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config NETFILTER_NETLINK_QUEUE
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tristate "Netfilter NFQUEUE over NFNETLINK interface"
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depends on NETFILTER_NETLINK
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help
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If this option is enabled, the kernel will include support
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for queueing packets via NFNETLINK.
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config NETFILTER_NETLINK_LOG
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tristate "Netfilter LOG over NFNETLINK interface"
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depends on NETFILTER_NETLINK
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help
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If this option is enabled, the kernel will include support
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for logging packets via NFNETLINK.
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This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
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and is also scheduled to replace the old syslog-based ipt_LOG
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and ip6t_LOG modules.
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# Rename this to NF_CONNTRACK in a 2.6.25
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config NF_CONNTRACK_ENABLED
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tristate "Netfilter connection tracking support"
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help
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Connection tracking keeps a record of what packets have passed
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through your machine, in order to figure out how they are related
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into connections.
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This is required to do Masquerading or other kinds of Network
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Address Translation (except for Fast NAT). It can also be used to
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enhance packet filtering (see `Connection state match support'
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below).
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK
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tristate
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default NF_CONNTRACK_ENABLED
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config NF_CT_ACCT
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bool "Connection tracking flow accounting"
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depends on NF_CONNTRACK
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help
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If this option is enabled, the connection tracking code will
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keep per-flow packet and byte counters.
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Those counters can be used for flow-based accounting or the
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`connbytes' match.
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If unsure, say `N'.
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config NF_CONNTRACK_MARK
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bool 'Connection mark tracking support'
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depends on NF_CONNTRACK
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help
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This option enables support for connection marks, used by the
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`CONNMARK' target and `connmark' match. Similar to the mark value
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of packets, but this mark value is kept in the conntrack session
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instead of the individual packets.
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config NF_CONNTRACK_SECMARK
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bool 'Connection tracking security mark support'
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depends on NF_CONNTRACK && NETWORK_SECMARK
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help
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This option enables security markings to be applied to
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connections. Typically they are copied to connections from
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packets using the CONNSECMARK target and copied back from
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connections to packets with the same target, with the packets
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being originally labeled via SECMARK.
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If unsure, say 'N'.
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config NF_CONNTRACK_EVENTS
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bool "Connection tracking events (EXPERIMENTAL)"
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depends on EXPERIMENTAL && NF_CONNTRACK
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help
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If this option is enabled, the connection tracking code will
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provide a notifier chain that can be used by other kernel code
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to get notified about changes in the connection tracking state.
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If unsure, say `N'.
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config NF_CT_PROTO_GRE
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tristate
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depends on NF_CONNTRACK
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config NF_CT_PROTO_SCTP
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tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
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depends on EXPERIMENTAL && NF_CONNTRACK
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default n
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help
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With this option enabled, the layer 3 independent connection
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tracking code will be able to do state tracking on SCTP connections.
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
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config NF_CONNTRACK_AMANDA
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tristate "Amanda backup protocol support"
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depends on NF_CONNTRACK
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select TEXTSEARCH
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select TEXTSEARCH_KMP
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help
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If you are running the Amanda backup package <http://www.amanda.org/>
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on this machine or machines that will be MASQUERADED through this
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machine, then you may want to enable this feature. This allows the
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connection tracking and natting code to allow the sub-channels that
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Amanda requires for communication of the backup data, messages and
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index.
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK_FTP
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tristate "FTP protocol support"
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depends on NF_CONNTRACK
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help
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Tracking FTP connections is problematic: special helpers are
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required for tracking them, and doing masquerading and other forms
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of Network Address Translation on them.
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This is FTP support on Layer 3 independent connection tracking.
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Layer 3 independent connection tracking is experimental scheme
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which generalize ip_conntrack to support other layer 3 protocols.
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK_H323
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tristate "H.323 protocol support (EXPERIMENTAL)"
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depends on EXPERIMENTAL && NF_CONNTRACK && (IPV6 || IPV6=n)
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help
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H.323 is a VoIP signalling protocol from ITU-T. As one of the most
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important VoIP protocols, it is widely used by voice hardware and
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software including voice gateways, IP phones, Netmeeting, OpenPhone,
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Gnomemeeting, etc.
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With this module you can support H.323 on a connection tracking/NAT
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firewall.
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This module supports RAS, Fast Start, H.245 Tunnelling, Call
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Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
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whiteboard, file transfer, etc. For more information, please
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visit http://nath323.sourceforge.net/.
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK_IRC
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tristate "IRC protocol support"
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depends on NF_CONNTRACK
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help
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There is a commonly-used extension to IRC called
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Direct Client-to-Client Protocol (DCC). This enables users to send
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files to each other, and also chat to each other without the need
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of a server. DCC Sending is used anywhere you send files over IRC,
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and DCC Chat is most commonly used by Eggdrop bots. If you are
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using NAT, this extension will enable you to send files and initiate
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chats. Note that you do NOT need this extension to get files or
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have others initiate chats, or everything else in IRC.
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK_NETBIOS_NS
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tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
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depends on EXPERIMENTAL && NF_CONNTRACK
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help
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NetBIOS name service requests are sent as broadcast messages from an
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unprivileged port and responded to with unicast messages to the
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same port. This make them hard to firewall properly because connection
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tracking doesn't deal with broadcasts. This helper tracks locally
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originating NetBIOS name service requests and the corresponding
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responses. It relies on correct IP address configuration, specifically
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netmask and broadcast address. When properly configured, the output
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of "ip address show" should look similar to this:
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$ ip -4 address show eth0
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4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
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inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK_PPTP
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tristate "PPtP protocol support"
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depends on NF_CONNTRACK
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select NF_CT_PROTO_GRE
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help
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This module adds support for PPTP (Point to Point Tunnelling
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Protocol, RFC2637) connection tracking and NAT.
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If you are running PPTP sessions over a stateful firewall or NAT
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box, you may want to enable this feature.
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Please note that not all PPTP modes of operation are supported yet.
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Specifically these limitations exist:
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- Blindly assumes that control connections are always established
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in PNS->PAC direction. This is a violation of RFC2637.
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- Only supports a single call within each session
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK_SANE
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tristate "SANE protocol support (EXPERIMENTAL)"
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depends on EXPERIMENTAL && NF_CONNTRACK
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help
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SANE is a protocol for remote access to scanners as implemented
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by the 'saned' daemon. Like FTP, it uses separate control and
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data connections.
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With this module you can support SANE on a connection tracking
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firewall.
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK_SIP
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tristate "SIP protocol support (EXPERIMENTAL)"
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depends on EXPERIMENTAL && NF_CONNTRACK
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help
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SIP is an application-layer control protocol that can establish,
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modify, and terminate multimedia sessions (conferences) such as
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Internet telephony calls. With the ip_conntrack_sip and
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the nf_nat_sip modules you can support the protocol on a connection
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tracking/NATing firewall.
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CONNTRACK_TFTP
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tristate "TFTP protocol support"
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depends on NF_CONNTRACK
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help
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TFTP connection tracking helper, this is required depending
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on how restrictive your ruleset is.
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If you are using a tftp client behind -j SNAT or -j MASQUERADING
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you will need this.
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To compile it as a module, choose M here. If unsure, say N.
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config NF_CT_NETLINK
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tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
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depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
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depends on NF_CONNTRACK!=y || NETFILTER_NETLINK!=m
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depends on NF_NAT=n || NF_NAT
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help
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This option enables support for a netlink-based userspace interface
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config NETFILTER_XTABLES
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tristate "Netfilter Xtables support (required for ip_tables)"
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help
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This is required if you intend to use any of ip_tables,
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ip6_tables or arp_tables.
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# alphabetically ordered list of targets
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config NETFILTER_XT_TARGET_CLASSIFY
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tristate '"CLASSIFY" target support'
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depends on NETFILTER_XTABLES
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help
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This option adds a `CLASSIFY' target, which enables the user to set
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the priority of a packet. Some qdiscs can use this value for
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classification, among these are:
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atm, cbq, dsmark, pfifo_fast, htb, prio
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_TARGET_CONNMARK
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tristate '"CONNMARK" target support'
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depends on NETFILTER_XTABLES
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depends on IP_NF_MANGLE || IP6_NF_MANGLE
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depends on NF_CONNTRACK
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select NF_CONNTRACK_MARK
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help
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This option adds a `CONNMARK' target, which allows one to manipulate
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the connection mark value. Similar to the MARK target, but
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affects the connection mark value rather than the packet mark value.
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. The module will be called
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ipt_CONNMARK.ko. If unsure, say `N'.
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config NETFILTER_XT_TARGET_DSCP
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tristate '"DSCP" target support'
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depends on NETFILTER_XTABLES
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depends on IP_NF_MANGLE || IP6_NF_MANGLE
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help
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This option adds a `DSCP' target, which allows you to manipulate
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the IPv4/IPv6 header DSCP field (differentiated services codepoint).
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The DSCP field can have any value between 0x0 and 0x3f inclusive.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_TARGET_MARK
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tristate '"MARK" target support'
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depends on NETFILTER_XTABLES
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help
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This option adds a `MARK' target, which allows you to create rules
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in the `mangle' table which alter the netfilter mark (nfmark) field
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associated with the packet prior to routing. This can change
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the routing method (see `Use netfilter MARK value as routing
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key') and can also be used by other subsystems to change their
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behavior.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_TARGET_NFQUEUE
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tristate '"NFQUEUE" target Support'
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depends on NETFILTER_XTABLES
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help
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This target replaced the old obsolete QUEUE target.
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As opposed to QUEUE, it supports 65535 different queues,
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not just one.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_TARGET_NFLOG
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tristate '"NFLOG" target support'
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depends on NETFILTER_XTABLES
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help
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This option enables the NFLOG target, which allows to LOG
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messages through the netfilter logging API, which can use
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either the old LOG target, the old ULOG target or nfnetlink_log
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as backend.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_TARGET_NOTRACK
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tristate '"NOTRACK" target support'
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depends on NETFILTER_XTABLES
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depends on IP_NF_RAW || IP6_NF_RAW
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depends on NF_CONNTRACK
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help
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The NOTRACK target allows a select rule to specify
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which packets *not* to enter the conntrack/NAT
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subsystem with all the consequences (no ICMP error tracking,
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no protocol helpers for the selected packets).
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
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config NETFILTER_XT_TARGET_SECMARK
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tristate '"SECMARK" target support'
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depends on NETFILTER_XTABLES && NETWORK_SECMARK
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help
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The SECMARK target allows security marking of network
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packets, for use with security subsystems.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_TARGET_CONNSECMARK
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tristate '"CONNSECMARK" target support'
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depends on NETFILTER_XTABLES && NF_CONNTRACK && NF_CONNTRACK_SECMARK
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help
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The CONNSECMARK target copies security markings from packets
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to connections, and restores security markings from connections
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to packets (if the packets are not already marked). This would
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normally be used in conjunction with the SECMARK target.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_TARGET_TCPMSS
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tristate '"TCPMSS" target support'
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depends on NETFILTER_XTABLES && (IPV6 || IPV6=n)
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---help---
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This option adds a `TCPMSS' target, which allows you to alter the
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MSS value of TCP SYN packets, to control the maximum size for that
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connection (usually limiting it to your outgoing interface's MTU
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minus 40).
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This is used to overcome criminally braindead ISPs or servers which
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block ICMP Fragmentation Needed packets. The symptoms of this
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problem are that everything works fine from your Linux
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firewall/router, but machines behind it can never exchange large
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packets:
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1) Web browsers connect, then hang with no data received.
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2) Small mail works fine, but large emails hang.
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3) ssh works fine, but scp hangs after initial handshaking.
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Workaround: activate this option and add a rule to your firewall
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configuration like:
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iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
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-j TCPMSS --clamp-mss-to-pmtu
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_MATCH_COMMENT
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tristate '"comment" match support'
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depends on NETFILTER_XTABLES
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help
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This option adds a `comment' dummy-match, which allows you to put
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comments in your iptables ruleset.
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
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config NETFILTER_XT_MATCH_CONNBYTES
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tristate '"connbytes" per-connection counter match support'
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depends on NETFILTER_XTABLES
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depends on NF_CONNTRACK
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select NF_CT_ACCT
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help
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This option adds a `connbytes' match, which allows you to match the
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number of bytes and/or packets for each direction within a connection.
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
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config NETFILTER_XT_MATCH_CONNMARK
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tristate '"connmark" connection mark match support'
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depends on NETFILTER_XTABLES
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depends on NF_CONNTRACK
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select NF_CONNTRACK_MARK
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help
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This option adds a `connmark' match, which allows you to match the
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connection mark value previously set for the session by `CONNMARK'.
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. The module will be called
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ipt_connmark.ko. If unsure, say `N'.
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config NETFILTER_XT_MATCH_CONNTRACK
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tristate '"conntrack" connection tracking match support'
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depends on NETFILTER_XTABLES
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depends on NF_CONNTRACK
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help
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This is a general conntrack match module, a superset of the state match.
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It allows matching on additional conntrack information, which is
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useful in complex configurations, such as NAT gateways with multiple
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internet links or tunnels.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_MATCH_DCCP
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tristate '"DCCP" protocol match support'
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depends on NETFILTER_XTABLES
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help
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With this option enabled, you will be able to use the iptables
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`dccp' match in order to match on DCCP source/destination ports
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and DCCP flags.
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
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config NETFILTER_XT_MATCH_DSCP
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tristate '"DSCP" match support'
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depends on NETFILTER_XTABLES
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help
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This option adds a `DSCP' match, which allows you to match against
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the IPv4/IPv6 header DSCP field (differentiated services codepoint).
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The DSCP field can have any value between 0x0 and 0x3f inclusive.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_MATCH_ESP
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tristate '"ESP" match support'
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depends on NETFILTER_XTABLES
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help
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This match extension allows you to match a range of SPIs
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inside ESP header of IPSec packets.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_MATCH_HELPER
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tristate '"helper" match support'
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depends on NETFILTER_XTABLES
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depends on NF_CONNTRACK
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help
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Helper matching allows you to match packets in dynamic connections
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tracked by a conntrack-helper, ie. ip_conntrack_ftp
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To compile it as a module, choose M here. If unsure, say Y.
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config NETFILTER_XT_MATCH_LENGTH
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tristate '"length" match support'
|
|
depends on NETFILTER_XTABLES
|
|
help
|
|
This option allows you to match the length of a packet against a
|
|
specific value or range of values.
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To compile it as a module, choose M here. If unsure, say N.
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config NETFILTER_XT_MATCH_LIMIT
|
|
tristate '"limit" match support'
|
|
depends on NETFILTER_XTABLES
|
|
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.
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|
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To compile it as a module, choose M here. If unsure, say N.
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|
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config NETFILTER_XT_MATCH_MAC
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|
tristate '"mac" address match support'
|
|
depends on NETFILTER_XTABLES
|
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help
|
|
MAC matching allows you to match packets based on the source
|
|
Ethernet address of the packet.
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|
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To compile it as a module, choose M here. If unsure, say N.
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|
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config NETFILTER_XT_MATCH_MARK
|
|
tristate '"mark" match support'
|
|
depends on NETFILTER_XTABLES
|
|
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).
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|
|
|
To compile it as a module, choose M here. If unsure, say N.
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|
|
config NETFILTER_XT_MATCH_POLICY
|
|
tristate 'IPsec "policy" match support'
|
|
depends on NETFILTER_XTABLES && XFRM
|
|
help
|
|
Policy matching allows you to match packets based on the
|
|
IPsec policy that was used during decapsulation/will
|
|
be used during encapsulation.
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|
|
|
To compile it as a module, choose M here. If unsure, say N.
|
|
|
|
config NETFILTER_XT_MATCH_MULTIPORT
|
|
tristate "Multiple port match support"
|
|
depends on NETFILTER_XTABLES
|
|
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
|
|
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
|
|
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
|
|
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_REALM
|
|
tristate '"realm" match support'
|
|
depends on NETFILTER_XTABLES
|
|
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
|
|
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
|
|
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
|
|
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
|
|
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
|
|
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_U32
|
|
tristate '"u32" match support'
|
|
depends on NETFILTER_XTABLES
|
|
---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)
|
|
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
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