include/uapi/linux/vm_sockets.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * VMware vSockets Driver
   4  *
   5  * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation version 2 and no later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  */
  16
  17 #ifndef _UAPI_VM_SOCKETS_H
  18 #define _UAPI_VM_SOCKETS_H
  19
  20 #include <linux/socket.h>
  21 #include <linux/types.h>
  22
  23 /* Option name for STREAM socket buffer size.  Use as the option name in
  24  * setsockopt(3) or getsockopt(3) to set or get an unsigned long long that
  25  * specifies the size of the buffer underlying a vSockets STREAM socket.
  26  * Value is clamped to the MIN and MAX.
  27  */
  28
  29 #define SO_VM_SOCKETS_BUFFER_SIZE 0
  30
  31 /* Option name for STREAM socket minimum buffer size.  Use as the option name
  32  * in setsockopt(3) or getsockopt(3) to set or get an unsigned long long that
  33  * specifies the minimum size allowed for the buffer underlying a vSockets
  34  * STREAM socket.
  35  */
  36
  37 #define SO_VM_SOCKETS_BUFFER_MIN_SIZE 1
  38
  39 /* Option name for STREAM socket maximum buffer size.  Use as the option name
  40  * in setsockopt(3) or getsockopt(3) to set or get an unsigned long long
  41  * that specifies the maximum size allowed for the buffer underlying a
  42  * vSockets STREAM socket.
  43  */
  44
  45 #define SO_VM_SOCKETS_BUFFER_MAX_SIZE 2
  46
  47 /* Option name for socket peer's host-specific VM ID.  Use as the option name
  48  * in getsockopt(3) to get a host-specific identifier for the peer endpoint's
  49  * VM.  The identifier is a signed integer.
  50  * Only available for hypervisor endpoints.
  51  */
  52
  53 #define SO_VM_SOCKETS_PEER_HOST_VM_ID 3
  54
  55 /* Option name for determining if a socket is trusted.  Use as the option name
  56  * in getsockopt(3) to determine if a socket is trusted.  The value is a
  57  * signed integer.
  58  */
  59
  60 #define SO_VM_SOCKETS_TRUSTED 5
  61
  62 /* Option name for STREAM socket connection timeout.  Use as the option name
  63  * in setsockopt(3) or getsockopt(3) to set or get the connection
  64  * timeout for a STREAM socket.
  65  */
  66
  67 #define SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD 6
  68
  69 /* Option name for using non-blocking send/receive.  Use as the option name
  70  * for setsockopt(3) or getsockopt(3) to set or get the non-blocking
  71  * transmit/receive flag for a STREAM socket.  This flag determines whether
  72  * send() and recv() can be called in non-blocking contexts for the given
  73  * socket.  The value is a signed integer.
  74  *
  75  * This option is only relevant to kernel endpoints, where descheduling the
  76  * thread of execution is not allowed, for example, while holding a spinlock.
  77  * It is not to be confused with conventional non-blocking socket operations.
  78  *
  79  * Only available for hypervisor endpoints.
  80  */
  81
  82 #define SO_VM_SOCKETS_NONBLOCK_TXRX 7
  83
  84 #define SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW 8
  85
  86 #if !defined(__KERNEL__)
  87 #if __BITS_PER_LONG == 64 || (defined(__x86_64__) && defined(__ILP32__))
  88 #define SO_VM_SOCKETS_CONNECT_TIMEOUT SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD
  89 #else
  90 #define SO_VM_SOCKETS_CONNECT_TIMEOUT \
  91         (sizeof(time_t) == sizeof(__kernel_long_t) ? SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD : SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW)
  92 #endif
  93 #endif
  94
  95 /* The vSocket equivalent of INADDR_ANY.  This works for the svm_cid field of
  96  * sockaddr_vm and indicates the context ID of the current endpoint.
  97  */
  98
  99 #define VMADDR_CID_ANY -1U
 100
 101 /* Bind to any available port.  Works for the svm_port field of
 102  * sockaddr_vm.
 103  */
 104
 105 #define VMADDR_PORT_ANY -1U
 106
 107 /* Use this as the destination CID in an address when referring to the
 108  * hypervisor.  VMCI relies on it being 0, but this would be useful for other
 109  * transports too.
 110  */
 111
 112 #define VMADDR_CID_HYPERVISOR 0
 113
 114 /* Use this as the destination CID in an address when referring to the
 115  * local communication (loopback).
 116  * (This was VMADDR_CID_RESERVED, but even VMCI doesn't use it anymore,
 117  * it was a legacy value from an older release).
 118  */
 119
 120 #define VMADDR_CID_LOCAL 1
 121
 122 /* Use this as the destination CID in an address when referring to the host
 123  * (any process other than the hypervisor).  VMCI relies on it being 2, but
 124  * this would be useful for other transports too.
 125  */
 126
 127 #define VMADDR_CID_HOST 2
 128
 129 /* The current default use case for the vsock channel is the following:
 130  * local vsock communication between guest and host and nested VMs setup.
 131  * In addition to this, implicitly, the vsock packets are forwarded to the host
 132  * if no host->guest vsock transport is set.
 133  *
 134  * Set this flag value in the sockaddr_vm corresponding field if the vsock
 135  * packets need to be always forwarded to the host. Using this behavior,
 136  * vsock communication between sibling VMs can be setup.
 137  *
 138  * This way can explicitly distinguish between vsock channels created for
 139  * different use cases, such as nested VMs (or local communication between
 140  * guest and host) and sibling VMs.
 141  *
 142  * The flag can be set in the connect logic in the user space application flow.
 143  * In the listen logic (from kernel space) the flag is set on the remote peer
 144  * address. This happens for an incoming connection when it is routed from the
 145  * host and comes from the guest (local CID and remote CID > VMADDR_CID_HOST).
 146  */
 147 #define VMADDR_FLAG_TO_HOST 0x01
 148
 149 /* Invalid vSockets version. */
 150
 151 #define VM_SOCKETS_INVALID_VERSION -1U
 152
 153 /* The epoch (first) component of the vSockets version.  A single byte
 154  * representing the epoch component of the vSockets version.
 155  */
 156
 157 #define VM_SOCKETS_VERSION_EPOCH(_v) (((_v) & 0xFF000000) >> 24)
 158
 159 /* The major (second) component of the vSockets version.   A single byte
 160  * representing the major component of the vSockets version.  Typically
 161  * changes for every major release of a product.
 162  */
 163
 164 #define VM_SOCKETS_VERSION_MAJOR(_v) (((_v) & 0x00FF0000) >> 16)
 165
 166 /* The minor (third) component of the vSockets version.  Two bytes representing
 167  * the minor component of the vSockets version.
 168  */
 169
 170 #define VM_SOCKETS_VERSION_MINOR(_v) (((_v) & 0x0000FFFF))
 171
 172 /* Address structure for vSockets.   The address family should be set to
 173  * AF_VSOCK.  The structure members should all align on their natural
 174  * boundaries without resorting to compiler packing directives.  The total size
 175  * of this structure should be exactly the same as that of struct sockaddr.
 176  */
 177
 178 struct sockaddr_vm {
 179         __kernel_sa_family_t svm_family;
 180         unsigned short svm_reserved1;
 181         unsigned int svm_port;
 182         unsigned int svm_cid;
 183         __u8 svm_flags;
 184         unsigned char svm_zero[sizeof(struct sockaddr) -
 185                                sizeof(sa_family_t) -
 186                                sizeof(unsigned short) -
 187                                sizeof(unsigned int) -
 188                                sizeof(unsigned int) -
 189                                sizeof(__u8)];
 190 };
 191
 192 #define IOCTL_VM_SOCKETS_GET_LOCAL_CID          _IO(7, 0xb9)
 193
 194 /* MSG_ZEROCOPY notifications are encoded in the standard error format,
 195  * sock_extended_err. See Documentation/networking/msg_zerocopy.rst in
 196  * kernel source tree for more details.
 197  */
 198
 199 /* 'cmsg_level' field value of 'struct cmsghdr' for notification parsing
 200  * when MSG_ZEROCOPY flag is used on transmissions.
 201  */
 202
 203 #define SOL_VSOCK       287
 204
 205 /* 'cmsg_type' field value of 'struct cmsghdr' for notification parsing
 206  * when MSG_ZEROCOPY flag is used on transmissions.
 207  */
 208
 209 #define VSOCK_RECVERR   1
 210
 211 #endif /* _UAPI_VM_SOCKETS_H */