linux-kernel - Re: [PATCH bpf-next v1 2/5] af_unix: add unix_stream

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Message-ID: <6101a56bf2a11_1e1ff620813@john-XPS-13-9370.notmuch>
Date:   Wed, 28 Jul 2021 11:43:55 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        John Fastabend <john.fastabend@...il.com>
Cc:     Jiang Wang <jiang.wang@...edance.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "Cong Wang ." <cong.wang@...edance.com>,
        Xiongchun Duan <duanxiongchun@...edance.com>,
        xieyongji@...edance.com, chaiwen.cc@...edance.com,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Lorenz Bauer <lmb@...udflare.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Johan Almbladh <johan.almbladh@...finetworks.com>,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v1 2/5] af_unix: add unix_stream_proto for
 sockmap

Cong Wang wrote:
> On Tue, Jul 27, 2021 at 9:37 AM John Fastabend <john.fastabend@...il.com> wrote:
> > Do we really need an unhash hook for unix_stream? I'm doing some testing
> > now to pull it out of TCP side as well. It seems to be an artifact of old
> > code that is no longer necessary. On TCP side at least just using close()
> > looks to be enough now.
> 
> How do you handle the disconnection from remote without ->unhash()?

Would close() not work for stream/dgram sockets?

> 
> For all stream sockets, we still only allow established sockets to stay
> in sockmap, which means we have to remove it if it is disconnected
> or closed.

+1.

> 
> But it seems Jiang forgot to call ->unhash() when disconnecting.

Aha so we need to add it in af_unix code I guess. Anyways looking forward
to v2.

Thanks.