linux-kernel - Re: [PATCH bpf-next 1/2] bpf: Add flag BPF_F_NO_TUNNEL_KEY to bpf_skb_set_tunnel

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Date:   Mon, 19 Dec 2022 23:00:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Christian Ehrig <cehrig@...udflare.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
        sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mykolal@...com, shuah@...nel.org,
        joannelkoong@...il.com, kuifeng@...com, maximmi@...dia.com,
        fankaixi.li@...edance.com, shmulik@...anetworks.com,
        paul@...valent.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next 1/2] bpf: Add flag BPF_F_NO_TUNNEL_KEY to
 bpf_skb_set_tunnel_key()

Hello:

This series was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Sun, 18 Dec 2022 06:17:31 +0100 you wrote:
> This patch allows to remove TUNNEL_KEY from the tunnel flags bitmap
> when using bpf_skb_set_tunnel_key by providing a BPF_F_NO_TUNNEL_KEY
> flag. On egress, the resulting tunnel header will not contain a tunnel
> key if the protocol and implementation supports it.
> 
> At the moment bpf_tunnel_key wants a user to specify a numeric tunnel
> key. This will wrap the inner packet into a tunnel header with the key
> bit and value set accordingly. This is problematic when using a tunnel
> protocol that supports optional tunnel keys and a receiving tunnel
> device that is not expecting packets with the key bit set. The receiver
> won't decapsulate and drop the packet.
> 
> [...]

Here is the summary with links:
  - [bpf-next,1/2] bpf: Add flag BPF_F_NO_TUNNEL_KEY to bpf_skb_set_tunnel_key()
    https://git.kernel.org/bpf/bpf-next/c/e26aa600ba6a
  - [bpf-next,2/2] selftests/bpf: Add BPF_F_NO_TUNNEL_KEY test
    https://git.kernel.org/bpf/bpf-next/c/ac6e45e05857

You are awesome, thank you!
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