netdev - Re: [Patch bpf-next v3 03/10] af_unix: implement ->psock_update_sk

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Date:   Thu, 6 May 2021 17:55:58 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Jiang Wang <jiang.wang@...edance.com>,
        Xiongchun Duan <duanxiongchun@...edance.com>,
        Dongdong Wang <wangdongdong.6@...edance.com>,
        Cong Wang <cong.wang@...edance.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: Re: [Patch bpf-next v3 03/10] af_unix: implement ->psock_update_sk_prot()

On Thu, May 6, 2021 at 6:04 AM Jakub Sitnicki <jakub@...udflare.com> wrote:
> I think we also need unhash so that socket gets removed from sockmap
> on disconnect, that is connect(fd, {sa_family=AF_UNSPEC, ...}, ...).

Excellent catch! I thought disconnect is not supported for AF_UNIX
as there is not ->disconnect() in af_unix.c, but after reading
unix_dgram_connect() again, it is actually supported. Let me think
about how to handle this properly here.

Thanks.