mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-13 22:25:03 +00:00
9fb9cbb108
The existing connection tracking subsystem in netfilter can only handle ipv4. There were basically two choices present to add connection tracking support for ipv6. We could either duplicate all of the ipv4 connection tracking code into an ipv6 counterpart, or (the choice taken by these patches) we could design a generic layer that could handle both ipv4 and ipv6 and thus requiring only one sub-protocol (TCP, UDP, etc.) connection tracking helper module to be written. In fact nf_conntrack is capable of working with any layer 3 protocol. The existing ipv4 specific conntrack code could also not deal with the pecularities of doing connection tracking on ipv6, which is also cured here. For example, these issues include: 1) ICMPv6 handling, which is used for neighbour discovery in ipv6 thus some messages such as these should not participate in connection tracking since effectively they are like ARP messages 2) fragmentation must be handled differently in ipv6, because the simplistic "defrag, connection track and NAT, refrag" (which the existing ipv4 connection tracking does) approach simply isn't feasible in ipv6 3) ipv6 extension header parsing must occur at the correct spots before and after connection tracking decisions, and there were no provisions for this in the existing connection tracking design 4) ipv6 has no need for stateful NAT The ipv4 specific conntrack layer is kept around, until all of the ipv4 specific conntrack helpers are ported over to nf_conntrack and it is feature complete. Once that occurs, the old conntrack stuff will get placed into the feature-removal-schedule and we will fully kill it off 6 months later. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
98 lines
3.3 KiB
Text
98 lines
3.3 KiB
Text
menu "Core Netfilter Configuration"
|
|
depends on NET && 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 isenabled, 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.
|
|
|
|
config NF_CONNTRACK
|
|
tristate "Layer 3 Independent Connection tracking (EXPERIMENTAL)"
|
|
depends on EXPERIMENTAL && IP_NF_CONNTRACK=n
|
|
default n
|
|
---help---
|
|
Connection tracking keeps a record of what packets have passed
|
|
through your machine, in order to figure out how they are related
|
|
into connections.
|
|
|
|
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_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_EVENTS
|
|
bool "Connection tracking events"
|
|
depends on 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 aboutchanges in the connection tracking state.
|
|
|
|
If unsure, say `N'.
|
|
|
|
config NF_CT_PROTO_SCTP
|
|
tristate 'SCTP protocol on new 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
|
|
Documentation/modules.txt. If unsure, say `N'.
|
|
|
|
config NF_CONNTRACK_FTP
|
|
tristate "FTP support on new connection tracking (EXPERIMENTAL)"
|
|
depends on EXPERIMENTAL && 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.
|
|
|
|
endmenu
|