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Subject[RFC PATCH] Introduce V4V socket family for inter-virtual machines communication
Date
From: Julian Pidancet <julian.pidancet@citrix.com>

V4V is an hypervisor based inter domain-communication system beeing
developed for the Xen hypervisor.

I am currently working on a kernel socket family implementation of this
protocol and realized that socket family numbers were allocated
statically. It basically makes it impossible to create a new socket
family without having to modify the include/linux/socket.h and bump the
AF_MAX definition beforehand. (Any attempt to call sock_register() with
a family value greater than or equal to AF_MAX will fail).

Therefore I am submitting this RFC patch to find out wether it would be
acceptable to add a new socket family in the AF list without breaking
compatibility.

The socket family introduced in this patch is called AF_V4V, which
implies that the family would be Xen specific. But we can also consider
adding a more generic, hypervisor agnostic socket family, which enables
inter-VM communication.

Signed-off-by: Julian Pidancet <julian.pidancet@citrix.com>
---
include/linux/socket.h | 4 +++-
include/linux/v4v.h | 27 +++++++++++++++++++++++++++
2 files changed, 30 insertions(+), 1 deletions(-)
create mode 100644 include/linux/v4v.h
diff --git a/include/linux/socket.h b/include/linux/socket.h
index ba7b2e8..5e879d0 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -195,7 +195,8 @@ struct ucred {
#define AF_CAIF 37 /* CAIF sockets */
#define AF_ALG 38 /* Algorithm sockets */
#define AF_NFC 39 /* NFC sockets */
-#define AF_MAX 40 /* For now.. */
+#define AF_V4V 40 /* Inter virtual domain sockets */
+#define AF_MAX 41 /* For now.. */

/* Protocol families, same as address families. */
#define PF_UNSPEC AF_UNSPEC
@@ -238,6 +239,7 @@ struct ucred {
#define PF_CAIF AF_CAIF
#define PF_ALG AF_ALG
#define PF_NFC AF_NFC
+#define PF_V4V AF_V4V
#define PF_MAX AF_MAX

/* Maximum queue length specifiable by listen. */
diff --git a/include/linux/v4v.h b/include/linux/v4v.h
new file mode 100644
index 0000000..172f67f
--- /dev/null
+++ b/include/linux/v4v.h
@@ -0,0 +1,27 @@
+/*
+ * linux/v4v.h
+ *
+ * Definitions for V4V network layer
+ *
+ * Authors: Julian Pidancet <julian.pidancet@citrix.com>
+ * Copyright (c) 2012 Citrix Systems
+ * All rights reserved.
+ *
+ */
+#ifndef V4V_KERNEL_H
+#define V4V_KERNEL_H
+
+#include <linux/types.h>
+#include <linux/socket.h>
+
+typedef struct {
+ __u32 port;
+ __u16 domain;
+} v4v_address;
+
+struct sockaddr_v4v {
+ __kernel_sa_family_t sv4v_family;
+ v4v_address sv4v_addr;
+};
+
+#endif /* V4V_KERNEL_H */
--
Julian Pidancet


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