linux-kernel - [RFC PATCH v1 0/2] vsock: handle writes to shutdowned socket

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Message-ID: <20230801141727.481156-1-AVKrasnov@sberdevices.ru>
Date:   Tue, 1 Aug 2023 17:17:25 +0300
From:   Arseniy Krasnov <AVKrasnov@...rdevices.ru>
To:     Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>
CC:     <kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...rdevices.ru>, <oxffffaa@...il.com>,
        <avkrasnov@...rdevices.ru>,
        Arseniy Krasnov <AVKrasnov@...rdevices.ru>
Subject: [RFC PATCH v1 0/2] vsock: handle writes to shutdowned socket

Hello,

this small patchset adds POSIX compliant behaviour on writes to the
socket which was shutdowned with 'shutdown()' (both sides - local with
SHUT_WR flag, peer - with SHUT_RD flag). According POSIX we must send
SIGPIPE in such cases (but SIGPIPE is not send when MSG_NOSIGNAL is set).

First patch is implemented in the same way as net/ipv4/tcp.c:tcp_sendmsg_locked().
It uses 'sk_stream_error()' function which handles EPIPE error. Another
way is to use code from net/unix/af_unix.c:unix_stream_sendmsg() where
same logic from 'sk_stream_error()' is implemented "from scratch", but
it doesn't check 'sk_err' field. I think error from this field has more
priority to be returned from syscall. So I guess it is better to reuse
currently implemented 'sk_stream_error()' function.

Test is also added.

Head for this patchset is:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=9d0cd5d25f7d45bce01bbb3193b54ac24b3a60f3

Arseniy Krasnov (2):
  vsock: send SIGPIPE on write to shutdowned socket
  test/vsock: shutdowned socket test

 net/vmw_vsock/af_vsock.c         |   3 +
 tools/testing/vsock/vsock_test.c | 138 +++++++++++++++++++++++++++++++
 2 files changed, 141 insertions(+)

-- 
2.25.1