netdev - Re: [PATCH net-next] net: bail on sock_wfree, sock_rfree when we have a TCP

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Date:	Sat, 4 Jul 2015 10:40:59 +0200
From:	Eric Dumazet <edumazet@...gle.com>
To:	Julian Anastasov <ja@....bg>
Cc:	Alex Gartrell <alexgartrell@...il.com>,
	David Miller <davem@...emloft.net>,
	"agartrell@...com" <agartrell@...com>,
	netdev <netdev@...r.kernel.org>, kernel-team <kernel-team@...com>
Subject: Re: [PATCH net-next] net: bail on sock_wfree, sock_rfree when we have
 a TCP_TIMEWAIT sk

>         Looks like routing by definition can not divert skbs with
> early-demux socket because input routing is not called.

Only if found socket has a valid sk->sk_rx_dst

Early demux :

1) if TCP lookup found a matching socket, we do the attachment
   skb->sk = sk;
   skb->destructor = sock_edemux

2) If sk->sk_rx_dst is set and still valid, IP routing will use this cached dst.

So it looks very possible that some packets could match a socket but
fail the 2) phase.
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