netdev - Re: [PATCH bpf-next v3 05/12] bpf, sockmap: Allow inserting listening TCP sockets into sockmap

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Date:   Wed, 22 Jan 2020 20:52:01 +0000
From:   Martin Lau <kafai@...com>
To:     Jakub Sitnicki <jakub@...udflare.com>
CC:     "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-team@...udflare.com" <kernel-team@...udflare.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        "John Fastabend" <john.fastabend@...il.com>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: Re: [PATCH bpf-next v3 05/12] bpf, sockmap: Allow inserting listening
 TCP sockets into sockmap

On Wed, Jan 22, 2020 at 02:05:42PM +0100, Jakub Sitnicki wrote:
> In order for sockmap type to become a generic collection for storing TCP
> sockets we need to loosen the checks during map update, while tightening
> the checks in redirect helpers.
> 
> Currently sockmap requires the TCP socket to be in established state (or
> transitioning out of SYN_RECV into established state when done from BPF),
If I read the SYN_RECV changes correctly,
does it mean BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB currently not work?

> which prevents inserting listening sockets.
> 
> Change the update pre-checks so the socket can also be in listening state.
> 
> Since it doesn't make sense to redirect with sockmap to listening sockets,
> add appropriate socket state checks to BPF redirect helpers too.
Acked-by: Martin KaFai Lau <kafai@...com>