netfilter: ctnetlink: add callbacks to the per-proto nlattrs

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There is added a single callback for the l3 proto helper.  The two
callbacks for the l4 protos are necessary because of the general
structure of a ctnetlink event, which is in short:

 CTA_TUPLE_ORIG
   <l3/l4-proto-attributes>
 CTA_TUPLE_REPLY
   <l3/l4-proto-attributes>
 CTA_ID
 ...
 CTA_PROTOINFO
   <l4-proto-attributes>
 CTA_TUPLE_MASTER
   <l3/l4-proto-attributes>

Therefore the formular is

 size := sizeof(generic-nlas) + 3 * sizeof(tuple_nlas) + sizeof(protoinfo_nlas)

Some of the NLAs are optional, e. g. CTA_TUPLE_MASTER, which is only
set if it's an expected connection.  But the number of optional NLAs is
small enough to prevent netlink_trim() from reallocating if calculated
properly.

Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>

...

This commit is contained in:

Holger Eitzenberger 2009-03-25 18:24:48 +01:00 • committed by Patrick McHardy

parent b8dfe49877

commit d0dba7255b

3 changed files with 29 additions and 0 deletions

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7

include/net/netfilter/nf_conntrack_l3proto.h

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6

include/net/netfilter/nf_conntrack_l4proto.h

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