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From: Arseny Krasnov <arseny.krasnov@kaspersky.com>
To: Stefan Hajnoczi <stefanha@redhat.com>,
	Stefano Garzarella <sgarzare@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Arseny Krasnov <arseny.krasnov@kaspersky.com>,
	Colin Ian King <colin.king@canonical.com>,
	Andra Paraschiv <andraprs@amazon.com>,
	Jeff Vander Stoep <jeffv@google.com>
Cc: <kvm@vger.kernel.org>,
	<virtualization@lists.linux-foundation.org>,
	<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<stsp2@yandex.ru>, <oxffffaa@gmail.com>
Subject: [RFC PATCH v2 03/13] af_vsock: implement rx loops entry point
Date: Fri, 15 Jan 2021 08:41:16 +0300	[thread overview]
Message-ID: <20210115054119.1455879-1-arseny.krasnov@kaspersky.com> (raw)
In-Reply-To: <20210115053553.1454517-1-arseny.krasnov@kaspersky.com>

This adds entry point for STREAM/SEQPACKET rx loops. As both types are
connect oriented, so there are same checks before reading data from
socket. All this checks are performed in this entry point, then specific
rx loop is called.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
 net/vmw_vsock/af_vsock.c | 55 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index afacbe9f4231..38afaa90d141 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -2244,6 +2244,61 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
 	return err;
 }
 
+static int vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg,
+				     size_t len, int flags)
+{
+	struct sock *sk;
+	int err = 0;
+	struct vsock_sock *vsk;
+	const struct vsock_transport *transport;
+
+	sk = sock->sk;
+
+	lock_sock(sk);
+
+	vsk = vsock_sk(sk);
+	transport = vsk->transport;
+
+	if (!transport || sk->sk_state != TCP_ESTABLISHED) {
+		/* Recvmsg is supposed to return 0 if a peer performs an
+		 * orderly shutdown. Differentiate between that case and when a
+		 * peer has not connected or a local shutdown occurred with the
+		 * SOCK_DONE flag.
+		 */
+		if (!sock_flag(sk, SOCK_DONE))
+			err = -ENOTCONN;
+
+		goto out;
+	}
+
+	if (flags & MSG_OOB) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	/* We don't check peer_shutdown flag here since peer may actually shut
+	 * down, but there can be data in the queue that a local socket can
+	 * receive.
+	 */
+	if (sk->sk_shutdown & RCV_SHUTDOWN)
+		goto out;
+
+	/* It is valid on Linux to pass in a zero-length receive buffer.  This
+	 * is not an error.  We may as well bail out now.
+	 */
+	if (!len)
+		goto out;
+
+	if (sk->sk_type == SOCK_STREAM)
+		err = __vsock_stream_recvmsg(sk, msg, len, flags);
+	else
+		err = __vsock_seqpacket_recvmsg(sk, msg, len, flags);
+
+out:
+	release_sock(sk);
+	return err;
+}
+
 static const struct proto_ops vsock_stream_ops = {
 	.family = PF_VSOCK,
 	.owner = THIS_MODULE,
-- 
2.25.1


  parent reply	other threads:[~2021-01-15  5:42 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-15  5:35 [RFC PATCH v2 00/13] virtio/vsock: introduce SOCK_SEQPACKET support Arseny Krasnov
2021-01-15  5:40 ` [RFC PATCH v2 01/13] af_vsock: implement 'vsock_wait_data()' Arseny Krasnov
2021-01-18 14:51   ` Stefano Garzarella
2021-01-15  5:40 ` [RFC PATCH v2 02/13] af_vsock: separate rx loops for STREAM/SEQPACKET Arseny Krasnov
2021-01-18 15:04   ` Stefano Garzarella
2021-01-15  5:41 ` Arseny Krasnov [this message]
2021-01-15  5:41 ` [RFC PATCH v2 04/13] af_vsock: replace previous stream rx loop Arseny Krasnov
2021-01-15  5:42 ` [RFC PATCH v2 05/13] af_vsock: implement send logic for SOCK_SEQPACKET Arseny Krasnov
2021-01-15  5:42 ` [RFC PATCH v2 06/13] af_vsock: general support of SOCK_SEQPACKET type Arseny Krasnov
2021-01-18 15:12   ` Stefano Garzarella
2021-01-15  5:42 ` [RFC PATCH v2 07/13] af_vsock: update comments for stream sockets Arseny Krasnov
2021-01-15  5:43 ` [RFC PATCH v2 08/13] virtio/vsock: dequeue callback for SOCK_SEQPACKET Arseny Krasnov
2021-01-18 15:14   ` Stefano Garzarella
2021-01-15  5:43 ` [RFC PATCH v2 09/13] virtio/vsock: implement fetch of record length Arseny Krasnov
2021-01-15  5:44 ` [RFC PATCH v2 10/13] virtio/vsock: update receive logic Arseny Krasnov
2021-01-18 15:15   ` Stefano Garzarella
2021-01-15  5:44 ` [RFC PATCH v2 11/13] virtio/vsock: rest of SOCK_SEQPACKET support Arseny Krasnov
2021-01-18 15:15   ` Stefano Garzarella
2021-01-15  5:45 ` [RFC PATCH v2 12/13] vhost/vsock: support for SOCK_SEQPACKET socket Arseny Krasnov
2021-01-15  5:45 ` [RFC PATCH v2 13/13] vsock_test: add SOCK_SEQPACKET tests Arseny Krasnov
2021-01-15  9:59 ` [RFC PATCH v2 00/13] virtio/vsock: introduce SOCK_SEQPACKET support stsp
2021-01-18 15:16   ` Stefano Garzarella

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