// SPDX-License-Identifier: GPL-2.0-only

  /*
   * VMware vSockets Driver
   *
   * Copyright (C) 2007-2012 VMware, Inc. All rights reserved.

   */
  
  #include <linux/types.h>
  #include <linux/socket.h>
  #include <linux/stddef.h>
  #include <net/sock.h>

  #include <net/vsock_addr.h>

  
  void vsock_addr_init(struct sockaddr_vm *addr, u32 cid, u32 port)
  {
  	memset(addr, 0, sizeof(*addr));
  	addr->svm_family = AF_VSOCK;
  	addr->svm_cid = cid;
  	addr->svm_port = port;
  }
  EXPORT_SYMBOL_GPL(vsock_addr_init);
  
  int vsock_addr_validate(const struct sockaddr_vm *addr)
  {
  	if (!addr)
  		return -EFAULT;
  
  	if (addr->svm_family != AF_VSOCK)
  		return -EAFNOSUPPORT;
  
  	if (addr->svm_zero[0] != 0)
  		return -EINVAL;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(vsock_addr_validate);
  
  bool vsock_addr_bound(const struct sockaddr_vm *addr)
  {
  	return addr->svm_port != VMADDR_PORT_ANY;
  }
  EXPORT_SYMBOL_GPL(vsock_addr_bound);
  
  void vsock_addr_unbind(struct sockaddr_vm *addr)
  {
  	vsock_addr_init(addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
  }
  EXPORT_SYMBOL_GPL(vsock_addr_unbind);
  
  bool vsock_addr_equals_addr(const struct sockaddr_vm *addr,
  			    const struct sockaddr_vm *other)
  {
  	return addr->svm_cid == other->svm_cid &&
  		addr->svm_port == other->svm_port;
  }
  EXPORT_SYMBOL_GPL(vsock_addr_equals_addr);

  int vsock_addr_cast(const struct sockaddr *addr,
  		    size_t len, struct sockaddr_vm **out_addr)
  {
  	if (len < sizeof(**out_addr))
  		return -EFAULT;
  
  	*out_addr = (struct sockaddr_vm *)addr;
  	return vsock_addr_validate(*out_addr);
  }
  EXPORT_SYMBOL_GPL(vsock_addr_cast);