Commit 0e121905 authored by Stefano Garzarella's avatar Stefano Garzarella Committed by David S. Miller
Browse files

vsock: add local transport support in the vsock core 



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

Reviewed-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ef343b35

include/net/af_vsock.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

net/vmw_vsock/af_vsock.c

+16 −1
Original line number Diff line number Diff line
@@ -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);