netdev - Re: [PATCH bpf-next] flow_dissector: lookup netns by skb->sk if skb->dev is NULL

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Message-ID: <1cc82769-d4c4-2976-d341-0537d2d2eb24@iogearbox.net>
Date:   Tue, 25 Sep 2018 17:38:15 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        netdev@...r.kernel.org
Cc:     ast@...nel.org, davem@...emloft.net,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next] flow_dissector: lookup netns by skb->sk if
 skb->dev is NULL

On 09/24/2018 10:49 PM, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@...gle.com>
> 
> BPF flow dissectors are configured per network namespace.
> __skb_flow_dissect looks up the netns through dev_net(skb->dev).
> 
> In some dissector paths skb->dev is NULL, such as for Unix sockets.
> In these cases fall back to looking up the netns by socket.
> 
> Analyzing the codepaths leading to __skb_flow_dissect I did not find
> a case where both skb->dev and skb->sk are NULL. Warn and fall back to
> standard flow dissector if one is found.
> 
> Fixes: d58e468b1112 ("flow_dissector: implements flow dissector BPF hook")
> Reported-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Applied to bpf-next, thanks Willem!