From 0e12190578d081d4fe54d41635ec6e5a6eb0d01a Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Tue, 10 Dec 2019 11:43:04 +0100 Subject: 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 Signed-off-by: Stefano Garzarella Signed-off-by: David S. Miller --- net/vmw_vsock/af_vsock.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'net/vmw_vsock') 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); -- cgit v1.2.3