netdev - Re: [PATCH net] tcp: Always cleanup skb before sending

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Message-id: <20171102181658.GU44287@da0602a-dhcp105.apple.com>
Date:   Thu, 02 Nov 2017 11:16:58 -0700
From:   Christoph Paasch <cpaasch@...le.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] tcp: Always cleanup skb before sending

On 01/11/17 - 18:00:10, Eric Dumazet wrote:
> On Wed, 2017-11-01 at 17:10 -0700, Christoph Paasch wrote:
> 
> > Yes, that looks good to me. Thanks!
> > 
> > But we still need to clean up the skb in tcp_v4_send_reset and
> > tcp_v4_send_ack, as the fields (e.g., tcp_skb_cb->seq) have been set when
> > coming from tcp_v4_rcv.
> 
> You might be confused : ip_send_unicast_reply() does not send back the
> incoming skb.
> 
> A fresh skb is allocated, then appended/sent.
> 
> And commit 24a2d43d8886f5a29c did the changes to provide to
> __ip_options_echo() the proper IPCB header location.

Yes, sorry I misunderstood ip_send_unicast_reply(). Didn't see the
allocation of the new skb.


Christoph