netdev - Re: [PATCH] net: Provide SYN packet for passive connections

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Date:	Mon, 12 Mar 2012 22:56:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: Provide SYN packet for passive connections

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 12 Mar 2012 21:01:59 -0700

> [PATCH net-next] inet: embed icsk_accept_queue in an union
> 
> icsk_accept_queue is currently used only for LISTEN sockets. We could
> share its space with fields used for other kind of inet sockets.
> 
> For active connections, this area is zeroed in socket setup, and for
> passive ones, we clear the whole area in inet_csk_clone_lock() to make
> sure we dont use content inherited from (listener) parent.
> 
> /* Deinitialize accept_queue to trap illegal accesses. */
> memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
> 
> For 100% safety, we could do the same in inet_csk_listen_stop(), or we can
> double check that fields added in this union later are only accessed by non
> LISTEN sockets.
> 
> All these fields must have a null default value.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Suggested-by: Tom Herbert <therbert@...gle.com>

We can put this in when something that makes use of the new union
is added.
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