[PATCH v2] VSOCK: Support VM sockets connected to the hypervisor.

From: Reilly Grant
Date: Thu Mar 14 2013 - 17:56:45 EST


The resource ID used for VM socket control packets (0) is already
used for the VMCI_GET_CONTEXT_ID hypercall so a new ID (15) must be
used when the guest sends these datagrams to the hypervisor.

The hypervisor context ID must also be removed from the internal
blacklist.

Signed-off-by: Reilly Grant <grantr@xxxxxxxxxx>
Acked-by: Andy King <acking@xxxxxxxxxx>
---

I am an idiot and didn't commit the fix for two typos before generating
this patch. Please accept this corrected version.

net/vmw_vsock/vmci_transport.c | 16 +++++++++++++---
net/vmw_vsock/vmci_transport.h | 3 +++
2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
index a70ace8..faf81b8 100644
--- a/net/vmw_vsock/vmci_transport.c
+++ b/net/vmw_vsock/vmci_transport.c
@@ -123,6 +123,14 @@ static s32 vmci_transport_error_to_vsock_error(s32 vmci_error)
return err > 0 ? -err : err;
}

+static u32 vmci_transport_peer_rid(u32 peer_cid)
+{
+ if (VMADDR_CID_HYPERVISOR == peer_cid)
+ return VMCI_TRANSPORT_HYPERVISOR_PACKET_RID;
+
+ return VMCI_TRANSPORT_PACKET_RID;
+}
+
static inline void
vmci_transport_packet_init(struct vmci_transport_packet *pkt,
struct sockaddr_vm *src,
@@ -140,7 +148,7 @@ vmci_transport_packet_init(struct vmci_transport_packet *pkt,
pkt->dg.src = vmci_make_handle(VMADDR_CID_ANY,
VMCI_TRANSPORT_PACKET_RID);
pkt->dg.dst = vmci_make_handle(dst->svm_cid,
- VMCI_TRANSPORT_PACKET_RID);
+ vmci_transport_peer_rid(dst->svm_cid));
pkt->dg.payload_size = sizeof(*pkt) - sizeof(pkt->dg);
pkt->version = VMCI_TRANSPORT_PACKET_VERSION;
pkt->type = type;
@@ -511,6 +519,9 @@ static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid)

static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid)
{
+ if (VMADDR_CID_HYPERVISOR == peer_cid)
+ return true;
+
if (vsock->cached_peer != peer_cid) {
vsock->cached_peer = peer_cid;
if (!vmci_transport_is_trusted(vsock, peer_cid) &&
@@ -631,7 +642,6 @@ static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg)
static bool vmci_transport_stream_allow(u32 cid, u32 port)
{
static const u32 non_socket_contexts[] = {
- VMADDR_CID_HYPERVISOR,
VMADDR_CID_RESERVED,
};
int i;
@@ -670,7 +680,7 @@ static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg)
*/

if (!vmci_transport_stream_allow(dg->src.context, -1)
- || VMCI_TRANSPORT_PACKET_RID != dg->src.resource)
+ || vmci_transport_peer_rid(dg->src.context) != dg->src.resource)
return VMCI_ERROR_NO_ACCESS;

if (VMCI_DG_SIZE(dg) < sizeof(*pkt))
diff --git a/net/vmw_vsock/vmci_transport.h b/net/vmw_vsock/vmci_transport.h
index 1bf9918..fd88ea8 100644
--- a/net/vmw_vsock/vmci_transport.h
+++ b/net/vmw_vsock/vmci_transport.h
@@ -28,6 +28,9 @@
/* The resource ID on which control packets are sent. */
#define VMCI_TRANSPORT_PACKET_RID 1

+/* The resource ID on which control packets are sent to the hypervisor. */
+#define VMCI_TRANSPORT_HYPERVISOR_PACKET_RID 15
+
#define VSOCK_PROTO_INVALID 0
#define VSOCK_PROTO_PKT_ON_NOTIFY (1 << 0)
#define VSOCK_PROTO_ALL_SUPPORTED (VSOCK_PROTO_PKT_ON_NOTIFY)
--
1.8.1.5
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