netdev - Re: [bpf-next PATCH v3 05/18] bpf: create tcp_bpf_ulp allowing BPF to monitor socket TX/RX data

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Date:   Mon, 19 Mar 2018 09:27:22 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     davejwatson@...com, davem@...emloft.net, daniel@...earbox.net,
        ast@...nel.org, netdev@...r.kernel.org
Subject: Re: [bpf-next PATCH v3 05/18] bpf: create tcp_bpf_ulp allowing BPF
 to monitor socket TX/RX data

On Sun, Mar 18, 2018 at 12:57:10PM -0700, John Fastabend wrote:
> This implements a BPF ULP layer to allow policy enforcement and
> monitoring at the socket layer. In order to support this a new
> program type BPF_PROG_TYPE_SK_MSG is used to run the policy at
> the sendmsg/sendpage hook. To attach the policy to sockets a
> sockmap is used with a new program attach type BPF_SK_MSG_VERDICT.
> 
> Similar to previous sockmap usages when a sock is added to a
> sockmap, via a map update, if the map contains a BPF_SK_MSG_VERDICT
> program type attached then the BPF ULP layer is created on the
> socket and the attached BPF_PROG_TYPE_SK_MSG program is run for
> every msg in sendmsg case and page/offset in sendpage case.
...
> 
> Signed-off-by: John Fastabend <john.fastabend@...il.com>

looks great

Acked-by: Alexei Starovoitov <ast@...nel.org>