net/vmw_vsock/vsock_addr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VMware vSockets Driver
   4  *
   5  * Copyright (C) 2007-2012 VMware, Inc. All rights reserved.
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/socket.h>
  10 #include <linux/stddef.h>
  11 #include <net/sock.h>
  12 #include <net/vsock_addr.h>
  13
  14 void vsock_addr_init(struct sockaddr_vm *addr, u32 cid, u32 port)
  15 {
  16         memset(addr, 0, sizeof(*addr));
  17         addr->svm_family = AF_VSOCK;
  18         addr->svm_cid = cid;
  19         addr->svm_port = port;
  20 }
  21 EXPORT_SYMBOL_GPL(vsock_addr_init);
  22
  23 int vsock_addr_validate(const struct sockaddr_vm *addr)
  24 {
  25         __u8 svm_valid_flags = VMADDR_FLAG_TO_HOST;
  26
  27         if (!addr)
  28                 return -EFAULT;
  29
  30         if (addr->svm_family != AF_VSOCK)
  31                 return -EAFNOSUPPORT;
  32
  33         if (addr->svm_flags & ~svm_valid_flags)
  34                 return -EINVAL;
  35
  36         return 0;
  37 }
  38 EXPORT_SYMBOL_GPL(vsock_addr_validate);
  39
  40 bool vsock_addr_bound(const struct sockaddr_vm *addr)
  41 {
  42         return addr->svm_port != VMADDR_PORT_ANY;
  43 }
  44 EXPORT_SYMBOL_GPL(vsock_addr_bound);
  45
  46 void vsock_addr_unbind(struct sockaddr_vm *addr)
  47 {
  48         vsock_addr_init(addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
  49 }
  50 EXPORT_SYMBOL_GPL(vsock_addr_unbind);
  51
  52 bool vsock_addr_equals_addr(const struct sockaddr_vm *addr,
  53                             const struct sockaddr_vm *other)
  54 {
  55         return addr->svm_cid == other->svm_cid &&
  56                 addr->svm_port == other->svm_port;
  57 }
  58 EXPORT_SYMBOL_GPL(vsock_addr_equals_addr);
  59
  60 int vsock_addr_cast(const struct sockaddr *addr,
  61                     size_t len, struct sockaddr_vm **out_addr)
  62 {
  63         if (len < sizeof(**out_addr))
  64                 return -EFAULT;
  65
  66         *out_addr = (struct sockaddr_vm *)addr;
  67         return vsock_addr_validate(*out_addr);
  68 }
  69 EXPORT_SYMBOL_GPL(vsock_addr_cast);