usr/src/lib/sun_fc/common/Sun_fcAdapterCreateWWN.cc

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26
  27
  28 #include <fstream>
  29 #include "fcntl.h"
  30 #include "Handle.h"
  31 #include "Trace.h"
  32 #include "Exceptions.h"
  33 #include "sun_fc.h"
  34 #include <unistd.h>
  35
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 void get_random_bytes(HBA_UINT8 *ptr, size_t len) {
  41         int fd = open("/dev/urandom", O_RDONLY);
  42         size_t resid = len;
  43         ssize_t bytes;
  44
  45         while (resid != 0) {
  46                 bytes = read(fd, ptr, resid);
  47                 ptr += bytes;
  48                 resid -= bytes;
  49         }
  50         close (fd);
  51         return;
  52 }
  53
  54 HBA_STATUS Sun_fcAdapterCreateWWN(HBA_HANDLE handle,
  55     HBA_UINT32 portindex, HBA_WWN *nwwn, HBA_WWN *pwwn,
  56     HBA_WWN *OUI, HBA_INT32 method) {
  57         HBA_UINT8       randombyte[5] = {0};
  58         HBA_WWN         randomwwn = {0};
  59         int             index = 0;
  60
  61         Trace log("Sun_fcAdapterCreateWWN");
  62
  63         if ((nwwn == NULL) || (pwwn == NULL)) {
  64                 log.userError(
  65                     "NULL WWN pointer");
  66                 return (HBA_STATUS_ERROR_ARG);
  67         }
  68         if (method == HBA_CREATE_WWN_FACTORY) {
  69                 return (HBA_STATUS_ERROR_NOT_SUPPORTED);
  70         }
  71
  72         try {
  73                 /* create EUI-64 Mapped WWN */
  74                 if (OUI == NULL) {
  75                         /* if no OUI spec'd, used one of Sun's */
  76                         randomwwn.wwn[index++] = 0x0;
  77                         randomwwn.wwn[index++] = 0x0;
  78                         randomwwn.wwn[index++] = 0x7D;
  79                 } else {
  80                         memcpy(randomwwn.wwn, OUI->wwn, sizeof(HBA_WWN));
  81                         index += 3;
  82                 }
  83                 /*
  84                  * for EUI-64 mapped, shift OUI first byte right two bits
  85                  * then set top two bits to 11
  86                  */
  87                 randomwwn.wwn[0] = randomwwn.wwn[0] >> 2;
  88                 randomwwn.wwn[0] = randomwwn.wwn[0] | 0xc0;
  89
  90                 /* now create and add 40 random bits */
  91                 get_random_bytes(randombyte, 5);
  92                 memcpy(randomwwn.wwn+index, randombyte, 5);
  93
  94                 memcpy(nwwn->wwn, randomwwn.wwn, sizeof(HBA_WWN));
  95
  96                 /* toggle lowest bit, to make NWWN and PWWN unique */
  97                 randomwwn.wwn[7] = randomwwn.wwn[7] ^ 1;
  98                 memcpy(pwwn->wwn, randomwwn.wwn, sizeof(HBA_WWN));
  99
 100                 return (HBA_STATUS_OK);
 101         } catch (HBAException &e) {
 102                 return (e.getErrorCode());
 103         } catch (...) {
 104                 log.internalError(
 105                     "Uncaught exception");
 106                 return (HBA_STATUS_ERROR);
 107         }
 108 }
 109 #ifdef  __cplusplus
 110 }
 111 #endif