netdev - Re: [Patch bpf-next v3 04/10] af_unix: set TCP_ESTABLISHED for datagram sockets too

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Date:   Sat, 8 May 2021 13:41:18 -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 04/10] af_unix: set TCP_ESTABLISHED for
 datagram sockets too

On Fri, May 7, 2021 at 1:18 AM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> On Mon, Apr 26, 2021 at 04:49 AM CEST, Cong Wang wrote:
> > diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> > index 8968ed44a89f..c4afc5fbe137 100644
> > --- a/net/unix/af_unix.c
> > +++ b/net/unix/af_unix.c
> > @@ -1206,6 +1206,8 @@ static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr,
> >               unix_peer(sk) = other;
> >               unix_state_double_unlock(sk, other);
> >       }
> > +
> > +     sk->sk_state = other->sk_state = TCP_ESTABLISHED;
>
> `other` can be NULL. In such case we're back to UNCONNECTED state.

Right, we also need to move the sk_state back to TCP_CLOSE
after disconnecting.

Thanks.