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vm_sockets.h
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/* 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 _VM_SOCKETS_H #define _VM_SOCKETS_H #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 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 /* 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) #endif /* _VM_SOCKETS_H */