[PATCH net-next v2 3/6] vsock: add local transport support in the vsock core

[Stefano Garzarella]

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

Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
Signed-off-by: Stefano Garzarella <sgarz...@redhat.com>
---
 include/net/af_vsock.h   |  2 ++
 net/vmw_vsock/af_vsock.c | 17 ++++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 4206dc6d813f..b1c717286993 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -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;
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 74db4cd637a7..3da0749a0c97 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -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);
-- 
2.23.0

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