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
178struct 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 */
212

source code of linux/include/uapi/linux/vm_sockets.h

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