From: Julian Pidancet <[email protected]> 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 <[email protected]> --- 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 <[email protected]> + * 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
