menu "Core Netfilter Configuration" depends on NET && INET && NETFILTER config NETFILTER_NETLINK tristate "Netfilter netlink interface" help If this option is enabled, the kernel will include support for the new netfilter netlink interface. config NETFILTER_NETLINK_QUEUE tristate "Netfilter NFQUEUE over NFNETLINK interface" depends on 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" depends on 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. # Rename this to NF_CONNTRACK in a 2.6.25 config NF_CONNTRACK_ENABLED tristate "Netfilter connection tracking support" 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_CONNTRACK tristate default NF_CONNTRACK_ENABLED config NF_CT_ACCT bool "Connection tracking flow accounting" 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 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 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 (EXPERIMENTAL)" depends on EXPERIMENTAL && 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 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 default n 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 . If unsure, say `N'. config NF_CT_PROTO_UDPLITE tristate 'UDP-Lite protocol connection tracking support (EXPERIMENTAL)' depends on EXPERIMENTAL && NF_CONNTRACK 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 select TEXTSEARCH select TEXTSEARCH_KMP help If you are running the Amanda backup package 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 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 (EXPERIMENTAL)" depends on EXPERIMENTAL && NF_CONNTRACK && (IPV6 || IPV6=n) 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 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 (EXPERIMENTAL)" depends on EXPERIMENTAL && NF_CONNTRACK 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: 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 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 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 (EXPERIMENTAL)" depends on EXPERIMENTAL && NF_CONNTRACK 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 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 (EXPERIMENTAL)' depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK depends on NF_CONNTRACK!=y || NETFILTER_NETLINK!=m depends on NF_NAT=n || NF_NAT help This option enables support for a netlink-based userspace interface config NETFILTER_XTABLES tristate "Netfilter Xtables support (required for ip_tables)" 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 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 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 . The module will be called ipt_CONNMARK.ko. If unsure, say `N'. config NETFILTER_XT_TARGET_DSCP tristate '"DSCP" target support' depends on NETFILTER_XTABLES depends on IP_NF_MANGLE || IP6_NF_MANGLE 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. 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 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 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 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 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 . 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 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 . If unsure, say `N'. config NETFILTER_XT_TARGET_SECMARK tristate '"SECMARK" target support' depends on NETFILTER_XTABLES && NETWORK_SECMARK 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 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) ---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 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 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 . If unsure, say `N'. config NETFILTER_XT_MATCH_CONNBYTES tristate '"connbytes" per-connection counter match support' depends on NETFILTER_XTABLES depends on NF_CONNTRACK 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 . If unsure, say `N'. config NETFILTER_XT_MATCH_CONNLIMIT tristate '"connlimit" match support"' depends on NETFILTER_XTABLES depends on NF_CONNTRACK ---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 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 . 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 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 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 . If unsure, say `N'. config NETFILTER_XT_MATCH_DSCP tristate '"DSCP" match support' depends on NETFILTER_XTABLES 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. 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 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 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_LENGTH 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. 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 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 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 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 ---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 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 "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 . 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 . 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 . 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_TIME tristate '"time" match support' depends on NETFILTER_XTABLES ---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 ---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