netdev - Query regarding sk

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Message-ID: <20150109112302.GA9428@kumar-pc.asicdesigners.com>
Date:	Fri, 9 Jan 2015 17:23:04 +0600
From:	Kumar Sanghvi <kumaras@...lsio.com>
To:	<netdev@...r.kernel.org>
Subject: Query regarding sk_filter

Hi netdev team,

I have a query regarding sk_filter call in tcp receive path:

In 'tcp_v4_rcv' function, if sk is found by __inet_lookup_skb then,
down the line, there is a call to sk_filter to ensure if the incoming packet 
is allowed to be processed for that sk.

However, in 'tcp_v4_hnd_req' function, if nsk is found by inet_lookup_established 
then, later, there does not seem to be a sk_filter call for that nsk in the receive 
path processing.

I am wondering shouldn't there be a sk_filter call on nsk found in 'tcp_v4_hnd_req' 
function ? Or, probably I am missing something.
I am running some high rate syn-flood tests and trying to understand the sk_filter 
behaviour in this case.

Thanks,
Kumar.
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