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vsock: add local transport support in the vsock core 

This patch allows to register a transport able to handle
local communication (loopback).

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Garzarella 2019-12-10 11:43:04 +01:00 committed by David S. Miller
parent ef343b35d4
commit 0e12190578
2 changed files with 18 additions and 1 deletions
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2
include/net/af_vsock.h
View File

@ -98,6 +98,8 @@ struct vsock_transport_send_notify_data {
#define VSOCK_TRANSPORT_F_G2H 0x00000002
/* Transport provides DGRAM communication */
#define VSOCK_TRANSPORT_F_DGRAM 0x00000004
/* Transport provides local (loopback) communication */
#define VSOCK_TRANSPORT_F_LOCAL 0x00000008
struct vsock_transport {
struct module *module;

17
net/vmw_vsock/af_vsock.c
View File

@ -136,6 +136,8 @@ static const struct vsock_transport *transport_h2g;
static const struct vsock_transport *transport_g2h;
/* Transport used for DGRAM communication */
static const struct vsock_transport *transport_dgram;
/* Transport used for local communication */
static const struct vsock_transport *transport_local;
static DEFINE_MUTEX(vsock_register_mutex);
/**** UTILS ****/
@ -2137,7 +2139,7 @@ EXPORT_SYMBOL_GPL(vsock_core_get_transport);
int vsock_core_register(const struct vsock_transport *t, int features)
{
const struct vsock_transport *t_h2g, *t_g2h, *t_dgram;
const struct vsock_transport *t_h2g, *t_g2h, *t_dgram, *t_local;
int err = mutex_lock_interruptible(&vsock_register_mutex);
if (err)
@ -2146,6 +2148,7 @@ int vsock_core_register(const struct vsock_transport *t, int features)
t_h2g = transport_h2g;
t_g2h = transport_g2h;
t_dgram = transport_dgram;
t_local = transport_local;
if (features & VSOCK_TRANSPORT_F_H2G) {
if (t_h2g) {
@ -2171,9 +2174,18 @@ int vsock_core_register(const struct vsock_transport *t, int features)
t_dgram = t;
}
if (features & VSOCK_TRANSPORT_F_LOCAL) {
if (t_local) {
err = -EBUSY;
goto err_busy;
}
t_local = t;
}
transport_h2g = t_h2g;
transport_g2h = t_g2h;
transport_dgram = t_dgram;
transport_local = t_local;
err_busy:
mutex_unlock(&vsock_register_mutex);
@ -2194,6 +2206,9 @@ void vsock_core_unregister(const struct vsock_transport *t)
if (transport_dgram == t)
transport_dgram = NULL;
if (transport_local == t)
transport_local = NULL;
mutex_unlock(&vsock_register_mutex);
}
EXPORT_SYMBOL_GPL(vsock_core_unregister);