[NETFILTER]: Add ctnetlink subsystem

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Add ctnetlink subsystem for userspace-access to ip_conntrack table.
This allows reading and updating of existing entries, as well as
creating new ones (and new expect's) via nfnetlink.

Please note the 'strange' byte order: nfattr (tag+length) are in host
byte order, while the payload is always guaranteed to be in network
byte order.  This allows a simple userspace process to encapsulate netlink
messages into arch-independent udp packets by just processing/swapping the
headers and not knowing anything about the actual payload.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Harald Welte 2005-08-09 19:32:58 -07:00 • committed by David S. Miller

parent 6f1cf16582

commit 080774a243

23 changed files with 2277 additions and 100 deletions

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3

include/linux/netfilter/nfnetlink.h

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123

include/linux/netfilter/nfnetlink_conntrack.h

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