netdev - Re: [PATCH] net: implement IP_RECVHDRS option to get full headers through recvmsg cmsg.

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Message-ID: <1bcb3fdb-142f-6a94-d946-06dc08c29e8f@gmail.com>
Date:   Sat, 31 Mar 2018 23:51:06 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Maciej Żenczykowski <zenczykowski@...il.com>,
        Maciej Żenczykowski <maze@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Luigi Rizzo <lrizzo@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH] net: implement IP_RECVHDRS option to get full headers
 through recvmsg cmsg.



On 03/31/2018 10:43 PM, Maciej Żenczykowski wrote:
> From: Luigi Rizzo <lrizzo@...gle.com>
> 
> We have all sorts of different ways to fetch pre-UDP payload metadata:
>   IP_RECVTOS
>   IP_RECVTTL
>   IP_RECVOPTS
>   IP_RETOPTS
> 
> But nothing generic which simply allows you to receive the entire packet header.
> 
> This is in similar vein to TCP_SAVE_SYN but for UDP and other datagram sockets.
> 
> This is envisioned as a way to get GUE extension metadata for encapsulated
> packets, but implemented in a way to be much more future proof.
> 
> (Implemented by Luigi, who asked me to send it upstream)
> 

Hmm... what happened to IPv6 ? ;)