xref: /titanic_44/usr/src/lib/sun_fc/common/Sun_fcAdapterCreateWWN.cc (revision 56b2bdd1f04d465cfe4a95b88ae5cba5884154e4)
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 
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
112