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
  21 #include "vsock_addr.h"
  22
  23 void vsock_addr_init(struct sockaddr_vm *addr, u32 cid, u32 port)
  24 {
  25         memset(addr, 0, sizeof(*addr));
  26         addr->svm_family = AF_VSOCK;
  27         addr->svm_cid = cid;
  28         addr->svm_port = port;
  29 }
  30 EXPORT_SYMBOL_GPL(vsock_addr_init);
  31
  32 int vsock_addr_validate(const struct sockaddr_vm *addr)
  33 {
  34         if (!addr)
  35                 return -EFAULT;
  36
  37         if (addr->svm_family != AF_VSOCK)
  38                 return -EAFNOSUPPORT;
  39
  40         if (addr->svm_zero[0] != 0)
  41                 return -EINVAL;
  42
  43         return 0;
  44 }
  45 EXPORT_SYMBOL_GPL(vsock_addr_validate);
  46
  47 bool vsock_addr_bound(const struct sockaddr_vm *addr)
  48 {
  49         return addr->svm_port != VMADDR_PORT_ANY;
  50 }
  51 EXPORT_SYMBOL_GPL(vsock_addr_bound);
  52
  53 void vsock_addr_unbind(struct sockaddr_vm *addr)
  54 {
  55         vsock_addr_init(addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
  56 }
  57 EXPORT_SYMBOL_GPL(vsock_addr_unbind);
  58
  59 bool vsock_addr_equals_addr(const struct sockaddr_vm *addr,
  60                             const struct sockaddr_vm *other)
  61 {
  62         return addr->svm_cid == other->svm_cid &&
  63                 addr->svm_port == other->svm_port;
  64 }
  65 EXPORT_SYMBOL_GPL(vsock_addr_equals_addr);
  66
  67 int vsock_addr_cast(const struct sockaddr *addr,
  68                     size_t len, struct sockaddr_vm **out_addr)
  69 {
  70         if (len < sizeof(**out_addr))
  71                 return -EFAULT;
  72
  73         *out_addr = (struct sockaddr_vm *)addr;
  74         return vsock_addr_validate(*out_addr);
  75 }
  76 EXPORT_SYMBOL_GPL(vsock_addr_cast);