| # |
| # IP netfilter configuration |
| # |
| |
| menu "IP: Netfilter Configuration" |
| depends on INET && NETFILTER |
| |
| config NF_CONNTRACK_IPV4 |
| tristate "IPv4 support for new connection tracking (required for NAT) (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. |
| |
| config NF_CONNTRACK_PROC_COMPAT |
| bool "proc/sysctl compatibility with old connection tracking" |
| depends on NF_CONNTRACK_IPV4 |
| default y |
| help |
| This option enables /proc and sysctl compatibility with the old |
| layer 3 dependant connection tracking. This is needed to keep |
| old programs that have not been adapted to the new names working. |
| |
| If unsure, say Y. |
| |
| # connection tracking, helpers and protocols |
| 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_SECMARK |
| bool 'Connection tracking security mark support' |
| depends on IP_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 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 |
| depends on IP_NF_NAT=n || IP_NF_NAT |
| 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 |
| select TEXTSEARCH |
| select TEXTSEARCH_KMP |
| help |
| If you are running the Amanda backup package <http://www.amanda.org/> |
| on this machine or machines that will be MASQUERADED through this |
| machine, then you may want to enable this feature. This allows the |
| connection tracking and natting code to allow the sub-channels that |
| Amanda requires for communication of the backup data, messages and |
| index. |
| |
| To compile it as a module, choose M here. If unsure, say 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_H323 |
| tristate 'H.323 protocol support (EXPERIMENTAL)' |
| depends on IP_NF_CONNTRACK && EXPERIMENTAL |
| 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/. |
| |
| If you want to compile it as a module, say 'M' here and read |
| Documentation/modules.txt. If unsure, say 'N'. |
| |
| config IP_NF_SIP |
| tristate "SIP protocol support (EXPERIMENTAL)" |
| depends on IP_NF_CONNTRACK && EXPERIMENTAL |
| 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 ip_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 Y. |
| |
| 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_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_AH |
| tristate "AH match support" |
| depends on IP_NF_IPTABLES |
| help |
| This match extension allows you to match a range of SPIs |
| inside AH header 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'. |
| |
| # `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" |
| 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 appropriate 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: ip_conntrack |
| 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. |
| |
| # NAT + specific targets: nf_conntrack |
| config NF_NAT |
| tristate "Full NAT" |
| depends on IP_NF_IPTABLES && 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 |
| default y |
| |
| config NF_NAT_NEEDED |
| bool |
| depends on NF_NAT |
| default y |
| |
| config IP_NF_TARGET_MASQUERADE |
| tristate "MASQUERADE target support" |
| depends on (NF_NAT || 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 (NF_NAT || 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 (NF_NAT || 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 (NF_NAT || 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 |
| |
| config IP_NF_NAT_H323 |
| tristate |
| depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n |
| default IP_NF_NAT if IP_NF_H323=y |
| default m if IP_NF_H323=m |
| |
| config IP_NF_NAT_SIP |
| tristate |
| depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n |
| default IP_NF_NAT if IP_NF_SIP=y |
| default m if IP_NF_SIP=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_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 |
| |