netdev - Re: [PATCH net-next v5 2/3] bpf: Add new cgroup attach type to enable sock modifications

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Message-ID: <781e66b2-007c-bd56-2cd1-543c1f5dcdb7@cumulusnetworks.com>
Date:   Tue, 29 Nov 2016 17:43:08 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     netdev@...r.kernel.org, daniel@...que.org, ast@...com,
        daniel@...earbox.net, maheshb@...gle.com, tgraf@...g.ch
Subject: Re: [PATCH net-next v5 2/3] bpf: Add new cgroup attach type to enable
 sock modifications

On 11/29/16 1:01 PM, Alexei Starovoitov wrote:
> Could you also expose sk_protcol and sk_type as read only fields?

Those are bitfields in struct sock, so can't use offsetof or sizeof. Any existing use cases that try to load a bitfield in a bpf that I can look at?