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Date:   Sat, 30 Apr 2022 00:09:27 +0200
From:   "Jason A. Donenfeld" <>
To:     Eric Dumazet <>
Cc:     Eric Dumazet <>,
        Netdev <>,
        LKML <>,
        Jakub Kicinski <>,
        Hannes Frederic Sowa <>
Subject: Re: Routing loops & TTL tracking with tunnel devices

Hi Eric,

On Sat, Apr 30, 2022 at 12:05 AM Eric Dumazet <> wrote:
> I assume you add encap headers to the skb ?

Yes; it's encapsulated in UDP, and under that some short header.
However, everything under that is encrypted. So,

> You could check if the wireguard header is there already, or if the
> amount of headers is crazy.

so it's not quite possible to peer down further to see.

> You also can take a look at CONFIG_SKB_EXTENSIONS infrastructure.

Blech, this involves some kind of per-packet allocation, right? I was
hoping there might be some 6 or 7 or 8 bit field in sk_buff that's not
used anywhere on the TX path that maybe I could overload for this


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