Quelle vm_sockets.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* VMware vSockets Driver
*
* Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation version 2 and no later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
* more details.
*/

#ifndef _UAPI_VM_SOCKETS_H
#define _UAPI_VM_SOCKETS_H

#ifndef __KERNEL__
#include <sys/socket.h>        /* for struct sockaddr and sa_family_t */
#endif

#include <linux/socket.h>
#include <linux/types.h>

/* Option name for STREAM socket buffer size.  Use as the option name in
* setsockopt(3) or getsockopt(3) to set or get an unsigned long long that
* specifies the size of the buffer underlying a vSockets STREAM socket.
* Value is clamped to the MIN and MAX.
*/

#define SO_VM_SOCKETS_BUFFER_SIZE 0

/* Option name for STREAM socket minimum buffer size.  Use as the option name
* in setsockopt(3) or getsockopt(3) to set or get an unsigned long long that
* specifies the minimum size allowed for the buffer underlying a vSockets
* STREAM socket.
*/

#define SO_VM_SOCKETS_BUFFER_MIN_SIZE 1

/* Option name for STREAM socket maximum buffer size.  Use as the option name
* in setsockopt(3) or getsockopt(3) to set or get an unsigned long long
* that specifies the maximum size allowed for the buffer underlying a
* vSockets STREAM socket.
*/

#define SO_VM_SOCKETS_BUFFER_MAX_SIZE 2

/* Option name for socket peer's host-specific VM ID.  Use as the option name
* in getsockopt(3) to get a host-specific identifier for the peer endpoint's
* VM.  The identifier is a signed integer.
* Only available for hypervisor endpoints.
*/

#define SO_VM_SOCKETS_PEER_HOST_VM_ID 3

/* Option name for determining if a socket is trusted.  Use as the option name
* in getsockopt(3) to determine if a socket is trusted.  The value is a
* signed integer.
*/

#define SO_VM_SOCKETS_TRUSTED 5

/* Option name for STREAM socket connection timeout.  Use as the option name
* in setsockopt(3) or getsockopt(3) to set or get the connection
* timeout for a STREAM socket.
*/

#define SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD 6

/* Option name for using non-blocking send/receive.  Use as the option name
* for setsockopt(3) or getsockopt(3) to set or get the non-blocking
* transmit/receive flag for a STREAM socket.  This flag determines whether
* send() and recv() can be called in non-blocking contexts for the given
* socket.  The value is a signed integer.
*
* This option is only relevant to kernel endpoints, where descheduling the
* thread of execution is not allowed, for example, while holding a spinlock.
* It is not to be confused with conventional non-blocking socket operations.
*
* Only available for hypervisor endpoints.
*/

#define SO_VM_SOCKETS_NONBLOCK_TXRX 7

#define SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW 8

#if !defined(__KERNEL__)
#if __BITS_PER_LONG == 64 || (defined(__x86_64__) && defined(__ILP32__))
#define SO_VM_SOCKETS_CONNECT_TIMEOUT SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD
#else
#define SO_VM_SOCKETS_CONNECT_TIMEOUT \
(sizeof(time_t) == sizeof(__kernel_long_t) ? SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD : SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW)
#endif
#endif

/* The vSocket equivalent of INADDR_ANY.  This works for the svm_cid field of
* sockaddr_vm and indicates the context ID of the current endpoint.
*/

#define VMADDR_CID_ANY -1U

/* Bind to any available port.  Works for the svm_port field of
* sockaddr_vm.
*/

#define VMADDR_PORT_ANY -1U

/* Use this as the destination CID in an address when referring to the
* hypervisor.  VMCI relies on it being 0, but this would be useful for other
* transports too.
*/

#define VMADDR_CID_HYPERVISOR 0

/* Use this as the destination CID in an address when referring to the
* local communication (loopback).
* (This was VMADDR_CID_RESERVED, but even VMCI doesn't use it anymore,
* it was a legacy value from an older release).
*/

#define VMADDR_CID_LOCAL 1

/* Use this as the destination CID in an address when referring to the host
* (any process other than the hypervisor).  VMCI relies on it being 2, but
* this would be useful for other transports too.
*/

#define VMADDR_CID_HOST 2

/* The current default use case for the vsock channel is the following:
* local vsock communication between guest and host and nested VMs setup.
* In addition to this, implicitly, the vsock packets are forwarded to the host
* if no host->guest vsock transport is set.
*
* Set this flag value in the sockaddr_vm corresponding field if the vsock
* packets need to be always forwarded to the host. Using this behavior,
* vsock communication between sibling VMs can be setup.
*
* This way can explicitly distinguish between vsock channels created for
* different use cases, such as nested VMs (or local communication between
* guest and host) and sibling VMs.
*
* The flag can be set in the connect logic in the user space application flow.
* In the listen logic (from kernel space) the flag is set on the remote peer
* address. This happens for an incoming connection when it is routed from the
* host and comes from the guest (local CID and remote CID > VMADDR_CID_HOST).
*/
#define VMADDR_FLAG_TO_HOST 0x01

/* Invalid vSockets version. */

#define VM_SOCKETS_INVALID_VERSION -1U

/* The epoch (first) component of the vSockets version.  A single byte
* representing the epoch component of the vSockets version.
*/

#define VM_SOCKETS_VERSION_EPOCH(_v) (((_v) & 0xFF000000) >> 24)

/* The major (second) component of the vSockets version.   A single byte
* representing the major component of the vSockets version.  Typically
* changes for every major release of a product.
*/

#define VM_SOCKETS_VERSION_MAJOR(_v) (((_v) & 0x00FF0000) >> 16)

/* The minor (third) component of the vSockets version.  Two bytes representing
* the minor component of the vSockets version.
*/

#define VM_SOCKETS_VERSION_MINOR(_v) (((_v) & 0x0000FFFF))

/* Address structure for vSockets.   The address family should be set to
* AF_VSOCK.  The structure members should all align on their natural
* boundaries without resorting to compiler packing directives.  The total size
* of this structure should be exactly the same as that of struct sockaddr.
*/

struct sockaddr_vm {
__kernel_sa_family_t svm_family;
unsigned short svm_reserved1;
unsigned int svm_port;
unsigned int svm_cid;
__u8 svm_flags;
unsigned char svm_zero[sizeof(struct sockaddr) -
          sizeof(sa_family_t) -
          sizeof(unsigned short) -
          sizeof(unsigned int) -
          sizeof(unsigned int) -
          sizeof(__u8)];
};

#define IOCTL_VM_SOCKETS_GET_LOCAL_CID  _IO(7, 0xb9)

/* MSG_ZEROCOPY notifications are encoded in the standard error format,
* sock_extended_err. See Documentation/networking/msg_zerocopy.rst in
* kernel source tree for more details.
*/

/* 'cmsg_level' field value of 'struct cmsghdr' for notification parsing
* when MSG_ZEROCOPY flag is used on transmissions.
*/

#define SOL_VSOCK 287

/* 'cmsg_type' field value of 'struct cmsghdr' for notification parsing
* when MSG_ZEROCOPY flag is used on transmissions.
*/

#define VSOCK_RECVERR 1

#endif /* _UAPI_VM_SOCKETS_H */

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