[PATCH] new 'tcpack' match

[Jonas Berlin]

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Patrick McHardy wrote:

|> Matches TCP packets that has no payload, i.e. contains only ACKs.
|
| I can see that it would be useful, given all the half-working ACK
| matching rules for shaping floating around, but we already a tcp
| match, so it should be done in there, and, if possible, kept a little

I was thinking of this, but my mind tricked me into believing that it was a
too bold thing to do..

Speaking of tcp match.. would you happen to know when the "h" union of
sk_buff is instantiated?
~   a) first time someone does -p something
~   b) somewhere before the filter table
~   c) in a seemingly unpredictable fashion
~   d) ?

I kindof recall sometimes using it and oopsing the kernel because it was not
yet initialized.. The patch I posted currently starts from nh and calculates
the tcp header start itself.. :)

| bit more generic. Perhaps a data-len match option.

I was thinking of this too but couldn't think of much use for more specific
length-matching, so I thought I'd save a few cycles.. but ok if you think
it's the way to go, I go. :)

Any parameter name suggestions? "[!] --has-payload" ?

- --
- - xkr47
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