netdev - Re: [PATCH net v6] net: xdp: account for layer 3 packets in generic skb handler

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Message-Id: <20200820.115512.511642239854628332.davem@davemloft.net>
Date:   Thu, 20 Aug 2020 11:55:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     Jason@...c4.com
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, thomas@...kpuppet.org,
        adhipati@...a.io, dsahern@...il.com, toke@...hat.com,
        kuba@...nel.org, alexei.starovoitov@...il.com, brouer@...hat.com,
        john.fastabend@...il.com, daniel@...earbox.net
Subject: Re: [PATCH net v6] net: xdp: account for layer 3 packets in
 generic skb handler

From: "Jason A. Donenfeld" <Jason@...c4.com>
Date: Thu, 20 Aug 2020 11:13:49 +0200

> It seems like if an eBPF program pushes on a VLAN tag or changes the
> protocol or does any other modification, it will be treated in exactly
> the same way as the L2 packet above by the remaining parts of the
> networking stack.

What will update the skb metadata if the XDP program changes the
wireguard header(s)?