linux-kernel - [PATCH net-next v2 0/2] vsock: handle writes to shutdowned socket

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Message-ID: <20230911202027.1928574-1-avkrasnov@salutedevices.com>
Date:   Mon, 11 Sep 2023 23:20:25 +0300
From:   Arseniy Krasnov <avkrasnov@...utedevices.com>
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@...utedevices.com>
Subject: [PATCH net-next v2 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=73be7fb14e83d24383f840a22f24d3ed222ca319

Link to v1:
https://lore.kernel.org/netdev/20230801141727.481156-1-AVKrasnov@sberdevices.ru/
Link to v2 (RFC):
https://lore.kernel.org/netdev/20230826175900.3693844-1-avkrasnov@salutedevices.com/

Changelog:
v1 -> v2:
 * 0001 stills the same - SIGPIPE is sent only for SOCK_STREAM as discussed in v1
   with Stefano Garzarella <sgarzare@...hat.com>.
 * 0002 - use 'sig_atomic_t' instead of 'bool' for flag variables updated from
   signal handler.

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