include/uapi/linux/vm_sockets.h

   1 /*
   2  * VMware vSockets Driver
   3  *
   4  * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation version 2 and no later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #ifndef _UAPI_VM_SOCKETS_H
  17 #define _UAPI_VM_SOCKETS_H
  18
  19 #include <linux/socket.h>
  20
  21 /* Option name for STREAM socket buffer size.  Use as the option name in
  22  * setsockopt(3) or getsockopt(3) to set or get an unsigned long long that
  23  * specifies the size of the buffer underlying a vSockets STREAM socket.
  24  * Value is clamped to the MIN and MAX.
  25  */
  26
  27 #define SO_VM_SOCKETS_BUFFER_SIZE 0
  28
  29 /* Option name for STREAM socket minimum buffer size.  Use as the option name
  30  * in setsockopt(3) or getsockopt(3) to set or get an unsigned long long that
  31  * specifies the minimum size allowed for the buffer underlying a vSockets
  32  * STREAM socket.
  33  */
  34
  35 #define SO_VM_SOCKETS_BUFFER_MIN_SIZE 1
  36
  37 /* Option name for STREAM socket maximum buffer size.  Use as the option name
  38  * in setsockopt(3) or getsockopt(3) to set or get an unsigned long long
  39  * that specifies the maximum size allowed for the buffer underlying a
  40  * vSockets STREAM socket.
  41  */
  42
  43 #define SO_VM_SOCKETS_BUFFER_MAX_SIZE 2
  44
  45 /* Option name for socket peer's host-specific VM ID.  Use as the option name
  46  * in getsockopt(3) to get a host-specific identifier for the peer endpoint's
  47  * VM.  The identifier is a signed integer.
  48  * Only available for hypervisor endpoints.
  49  */
  50
  51 #define SO_VM_SOCKETS_PEER_HOST_VM_ID 3
  52
  53 /* Option name for determining if a socket is trusted.  Use as the option name
  54  * in getsockopt(3) to determine if a socket is trusted.  The value is a
  55  * signed integer.
  56  */
  57
  58 #define SO_VM_SOCKETS_TRUSTED 5
  59
  60 /* Option name for STREAM socket connection timeout.  Use as the option name
  61  * in setsockopt(3) or getsockopt(3) to set or get the connection
  62  * timeout for a STREAM socket.
  63  */
  64
  65 #define SO_VM_SOCKETS_CONNECT_TIMEOUT 6
  66
  67 /* Option name for using non-blocking send/receive.  Use as the option name
  68  * for setsockopt(3) or getsockopt(3) to set or get the non-blocking
  69  * transmit/receive flag for a STREAM socket.  This flag determines whether
  70  * send() and recv() can be called in non-blocking contexts for the given
  71  * socket.  The value is a signed integer.
  72  *
  73  * This option is only relevant to kernel endpoints, where descheduling the
  74  * thread of execution is not allowed, for example, while holding a spinlock.
  75  * It is not to be confused with conventional non-blocking socket operations.
  76  *
  77  * Only available for hypervisor endpoints.
  78  */
  79
  80 #define SO_VM_SOCKETS_NONBLOCK_TXRX 7
  81
  82 /* The vSocket equivalent of INADDR_ANY.  This works for the svm_cid field of
  83  * sockaddr_vm and indicates the context ID of the current endpoint.
  84  */
  85
  86 #define VMADDR_CID_ANY -1U
  87
  88 /* Bind to any available port.  Works for the svm_port field of
  89  * sockaddr_vm.
  90  */
  91
  92 #define VMADDR_PORT_ANY -1U
  93
  94 /* Use this as the destination CID in an address when referring to the
  95  * hypervisor.  VMCI relies on it being 0, but this would be useful for other
  96  * transports too.
  97  */
  98
  99 #define VMADDR_CID_HYPERVISOR 0
 100
 101 /* This CID is specific to VMCI and can be considered reserved (even VMCI
 102  * doesn't use it anymore, it's a legacy value from an older release).
 103  */
 104
 105 #define VMADDR_CID_RESERVED 1
 106
 107 /* Use this as the destination CID in an address when referring to the host
 108  * (any process other than the hypervisor).  VMCI relies on it being 2, but
 109  * this would be useful for other transports too.
 110  */
 111
 112 #define VMADDR_CID_HOST 2
 113
 114 /* Invalid vSockets version. */
 115
 116 #define VM_SOCKETS_INVALID_VERSION -1U
 117
 118 /* The epoch (first) component of the vSockets version.  A single byte
 119  * representing the epoch component of the vSockets version.
 120  */
 121
 122 #define VM_SOCKETS_VERSION_EPOCH(_v) (((_v) & 0xFF000000) >> 24)
 123
 124 /* The major (second) component of the vSockets version.   A single byte
 125  * representing the major component of the vSockets version.  Typically
 126  * changes for every major release of a product.
 127  */
 128
 129 #define VM_SOCKETS_VERSION_MAJOR(_v) (((_v) & 0x00FF0000) >> 16)
 130
 131 /* The minor (third) component of the vSockets version.  Two bytes representing
 132  * the minor component of the vSockets version.
 133  */
 134
 135 #define VM_SOCKETS_VERSION_MINOR(_v) (((_v) & 0x0000FFFF))
 136
 137 /* Address structure for vSockets.   The address family should be set to
 138  * AF_VSOCK.  The structure members should all align on their natural
 139  * boundaries without resorting to compiler packing directives.  The total size
 140  * of this structure should be exactly the same as that of struct sockaddr.
 141  */
 142
 143 struct sockaddr_vm {
 144         __kernel_sa_family_t svm_family;
 145         unsigned short svm_reserved1;
 146         unsigned int svm_port;
 147         unsigned int svm_cid;
 148         unsigned char svm_zero[sizeof(struct sockaddr) -
 149                                sizeof(sa_family_t) -
 150                                sizeof(unsigned short) -
 151                                sizeof(unsigned int) - sizeof(unsigned int)];
 152 };
 153
 154 #define IOCTL_VM_SOCKETS_GET_LOCAL_CID          _IO(7, 0xb9)
 155
 156 #endif /* _UAPI_VM_SOCKETS_H */