vm_sockets.h (7353B) - Raw
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 _VM_SOCKETS_H 18 #define _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 __BITS_PER_LONG == 64 || (defined(__x86_64__) && defined(__ILP32__)) 87 #define SO_VM_SOCKETS_CONNECT_TIMEOUT SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD 88 #else 89 #define SO_VM_SOCKETS_CONNECT_TIMEOUT \ 90 (sizeof(time_t) == sizeof(__kernel_long_t) ? SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD : SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW) 91 #endif 92 93 /* The vSocket equivalent of INADDR_ANY. This works for the svm_cid field of 94 * sockaddr_vm and indicates the context ID of the current endpoint. 95 */ 96 97 #define VMADDR_CID_ANY -1U 98 99 /* Bind to any available port. Works for the svm_port field of 100 * sockaddr_vm. 101 */ 102 103 #define VMADDR_PORT_ANY -1U 104 105 /* Use this as the destination CID in an address when referring to the 106 * hypervisor. VMCI relies on it being 0, but this would be useful for other 107 * transports too. 108 */ 109 110 #define VMADDR_CID_HYPERVISOR 0 111 112 /* Use this as the destination CID in an address when referring to the 113 * local communication (loopback). 114 * (This was VMADDR_CID_RESERVED, but even VMCI doesn't use it anymore, 115 * it was a legacy value from an older release). 116 */ 117 118 #define VMADDR_CID_LOCAL 1 119 120 /* Use this as the destination CID in an address when referring to the host 121 * (any process other than the hypervisor). VMCI relies on it being 2, but 122 * this would be useful for other transports too. 123 */ 124 125 #define VMADDR_CID_HOST 2 126 127 /* The current default use case for the vsock channel is the following: 128 * local vsock communication between guest and host and nested VMs setup. 129 * In addition to this, implicitly, the vsock packets are forwarded to the host 130 * if no host->guest vsock transport is set. 131 * 132 * Set this flag value in the sockaddr_vm corresponding field if the vsock 133 * packets need to be always forwarded to the host. Using this behavior, 134 * vsock communication between sibling VMs can be setup. 135 * 136 * This way can explicitly distinguish between vsock channels created for 137 * different use cases, such as nested VMs (or local communication between 138 * guest and host) and sibling VMs. 139 * 140 * The flag can be set in the connect logic in the user space application flow. 141 * In the listen logic (from kernel space) the flag is set on the remote peer 142 * address. This happens for an incoming connection when it is routed from the 143 * host and comes from the guest (local CID and remote CID > VMADDR_CID_HOST). 144 */ 145 #define VMADDR_FLAG_TO_HOST 0x01 146 147 /* Invalid vSockets version. */ 148 149 #define VM_SOCKETS_INVALID_VERSION -1U 150 151 /* The epoch (first) component of the vSockets version. A single byte 152 * representing the epoch component of the vSockets version. 153 */ 154 155 #define VM_SOCKETS_VERSION_EPOCH(_v) (((_v) & 0xFF000000) >> 24) 156 157 /* The major (second) component of the vSockets version. A single byte 158 * representing the major component of the vSockets version. Typically 159 * changes for every major release of a product. 160 */ 161 162 #define VM_SOCKETS_VERSION_MAJOR(_v) (((_v) & 0x00FF0000) >> 16) 163 164 /* The minor (third) component of the vSockets version. Two bytes representing 165 * the minor component of the vSockets version. 166 */ 167 168 #define VM_SOCKETS_VERSION_MINOR(_v) (((_v) & 0x0000FFFF)) 169 170 /* Address structure for vSockets. The address family should be set to 171 * AF_VSOCK. The structure members should all align on their natural 172 * boundaries without resorting to compiler packing directives. The total size 173 * of this structure should be exactly the same as that of struct sockaddr. 174 */ 175 176 struct sockaddr_vm { 177 __kernel_sa_family_t svm_family; 178 unsigned short svm_reserved1; 179 unsigned int svm_port; 180 unsigned int svm_cid; 181 __u8 svm_flags; 182 unsigned char svm_zero[sizeof(struct sockaddr) - 183 sizeof(sa_family_t) - 184 sizeof(unsigned short) - 185 sizeof(unsigned int) - 186 sizeof(unsigned int) - 187 sizeof(__u8)]; 188 }; 189 190 #define IOCTL_VM_SOCKETS_GET_LOCAL_CID _IO(7, 0xb9) 191 192 /* MSG_ZEROCOPY notifications are encoded in the standard error format, 193 * sock_extended_err. See Documentation/networking/msg_zerocopy.rst in 194 * kernel source tree for more details. 195 */ 196 197 /* 'cmsg_level' field value of 'struct cmsghdr' for notification parsing 198 * when MSG_ZEROCOPY flag is used on transmissions. 199 */ 200 201 #define SOL_VSOCK 287 202 203 /* 'cmsg_type' field value of 'struct cmsghdr' for notification parsing 204 * when MSG_ZEROCOPY flag is used on transmissions. 205 */ 206 207 #define VSOCK_RECVERR 1 208 209 #endif /* _VM_SOCKETS_H */