net/vmw_vsock/vsock_addr.c

   1 /*
   2  * VMware vSockets Driver
   3  *
   4  * Copyright (C) 2007-2012 VMware, Inc. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation version 2 and no later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #include <linux/types.h>
  17 #include <linux/socket.h>
  18 #include <linux/stddef.h>
  19 #include <net/sock.h>
  20 #include <net/vsock_addr.h>
  21
  22 void vsock_addr_init(struct sockaddr_vm *addr, u32 cid, u32 port)
  23 {
  24         memset(addr, 0, sizeof(*addr));
  25         addr->svm_family = AF_VSOCK;
  26         addr->svm_cid = cid;
  27         addr->svm_port = port;
  28 }
  29 EXPORT_SYMBOL_GPL(vsock_addr_init);
  30
  31 int vsock_addr_validate(const struct sockaddr_vm *addr)
  32 {
  33         if (!addr)
  34                 return -EFAULT;
  35
  36         if (addr->svm_family != AF_VSOCK)
  37                 return -EAFNOSUPPORT;
  38
  39         if (addr->svm_zero[0] != 0)
  40                 return -EINVAL;
  41
  42         return 0;
  43 }
  44 EXPORT_SYMBOL_GPL(vsock_addr_validate);
  45
  46 bool vsock_addr_bound(const struct sockaddr_vm *addr)
  47 {
  48         return addr->svm_port != VMADDR_PORT_ANY;
  49 }
  50 EXPORT_SYMBOL_GPL(vsock_addr_bound);
  51
  52 void vsock_addr_unbind(struct sockaddr_vm *addr)
  53 {
  54         vsock_addr_init(addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
  55 }
  56 EXPORT_SYMBOL_GPL(vsock_addr_unbind);
  57
  58 bool vsock_addr_equals_addr(const struct sockaddr_vm *addr,
  59                             const struct sockaddr_vm *other)
  60 {
  61         return addr->svm_cid == other->svm_cid &&
  62                 addr->svm_port == other->svm_port;
  63 }
  64 EXPORT_SYMBOL_GPL(vsock_addr_equals_addr);
  65
  66 int vsock_addr_cast(const struct sockaddr *addr,
  67                     size_t len, struct sockaddr_vm **out_addr)
  68 {
  69         if (len < sizeof(**out_addr))
  70                 return -EFAULT;
  71
  72         *out_addr = (struct sockaddr_vm *)addr;
  73         return vsock_addr_validate(*out_addr);
  74 }
  75 EXPORT_SYMBOL_GPL(vsock_addr_cast);