drivers/staging/lustre/lustre/ptlrpc/gss/gss_rawobj.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/gss/gss_rawobj.c
  37  *
  38  * Author: Eric Mei <ericm@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_SEC
  42
  43 #include <linux/mutex.h>
  44
  45 #include <obd.h>
  46 #include <obd_class.h>
  47 #include <obd_support.h>
  48 #include <lustre_sec.h>
  49
  50 #include "gss_internal.h"
  51
  52 int rawobj_empty(rawobj_t *obj)
  53 {
  54         LASSERT(equi(obj->len, obj->data));
  55         return (obj->len == 0);
  56 }
  57
  58 int rawobj_alloc(rawobj_t *obj, char *buf, int len)
  59 {
  60         LASSERT(obj);
  61         LASSERT(len >= 0);
  62
  63         obj->len = len;
  64         if (len) {
  65                 OBD_ALLOC_LARGE(obj->data, len);
  66                 if (!obj->data) {
  67                         obj->len = 0;
  68                         return -ENOMEM;
  69                 }
  70                 memcpy(obj->data, buf, len);
  71         } else
  72                 obj->data = NULL;
  73         return 0;
  74 }
  75
  76 void rawobj_free(rawobj_t *obj)
  77 {
  78         LASSERT(obj);
  79
  80         if (obj->len) {
  81                 LASSERT(obj->data);
  82                 OBD_FREE_LARGE(obj->data, obj->len);
  83                 obj->len = 0;
  84                 obj->data = NULL;
  85         } else
  86                 LASSERT(!obj->data);
  87 }
  88
  89 int rawobj_equal(rawobj_t *a, rawobj_t *b)
  90 {
  91         LASSERT(a && b);
  92
  93         return (a->len == b->len &&
  94                 (!a->len || !memcmp(a->data, b->data, a->len)));
  95 }
  96
  97 int rawobj_dup(rawobj_t *dest, rawobj_t *src)
  98 {
  99         LASSERT(src && dest);
 100
 101         dest->len = src->len;
 102         if (dest->len) {
 103                 OBD_ALLOC_LARGE(dest->data, dest->len);
 104                 if (!dest->data) {
 105                         dest->len = 0;
 106                         return -ENOMEM;
 107                 }
 108                 memcpy(dest->data, src->data, dest->len);
 109         } else
 110                 dest->data = NULL;
 111         return 0;
 112 }
 113
 114 int rawobj_serialize(rawobj_t *obj, __u32 **buf, __u32 *buflen)
 115 {
 116         __u32 len;
 117
 118         LASSERT(obj);
 119         LASSERT(buf);
 120         LASSERT(buflen);
 121
 122         len = cfs_size_round4(obj->len);
 123
 124         if (*buflen < 4 + len) {
 125                 CERROR("buflen %u <  %u\n", *buflen, 4 + len);
 126                 return -EINVAL;
 127         }
 128
 129         *(*buf)++ = cpu_to_le32(obj->len);
 130         memcpy(*buf, obj->data, obj->len);
 131         *buf += (len >> 2);
 132         *buflen -= (4 + len);
 133
 134         return 0;
 135 }
 136
 137 static int __rawobj_extract(rawobj_t *obj, __u32 **buf, __u32 *buflen,
 138                             int alloc, int local)
 139 {
 140         __u32 len;
 141
 142         if (*buflen < sizeof(__u32)) {
 143                 CERROR("buflen %u\n", *buflen);
 144                 return -EINVAL;
 145         }
 146
 147         obj->len = *(*buf)++;
 148         if (!local)
 149                 obj->len = le32_to_cpu(obj->len);
 150         *buflen -= sizeof(__u32);
 151
 152         if (!obj->len) {
 153                 obj->data = NULL;
 154                 return 0;
 155         }
 156
 157         len = local ? obj->len : cfs_size_round4(obj->len);
 158         if (*buflen < len) {
 159                 CERROR("buflen %u < %u\n", *buflen, len);
 160                 obj->len = 0;
 161                 return -EINVAL;
 162         }
 163
 164         if (!alloc)
 165                 obj->data = (__u8 *) *buf;
 166         else {
 167                 OBD_ALLOC_LARGE(obj->data, obj->len);
 168                 if (!obj->data) {
 169                         CERROR("fail to alloc %u bytes\n", obj->len);
 170                         obj->len = 0;
 171                         return -ENOMEM;
 172                 }
 173                 memcpy(obj->data, *buf, obj->len);
 174         }
 175
 176         *((char **)buf) += len;
 177         *buflen -= len;
 178
 179         return 0;
 180 }
 181
 182 int rawobj_extract(rawobj_t *obj, __u32 **buf, __u32 *buflen)
 183 {
 184         return __rawobj_extract(obj, buf, buflen, 0, 0);
 185 }
 186
 187 int rawobj_extract_alloc(rawobj_t *obj, __u32 **buf, __u32 *buflen)
 188 {
 189         return __rawobj_extract(obj, buf, buflen, 1, 0);
 190 }
 191
 192 int rawobj_extract_local(rawobj_t *obj, __u32 **buf, __u32 *buflen)
 193 {
 194         return __rawobj_extract(obj, buf, buflen, 0, 1);
 195 }
 196
 197 int rawobj_extract_local_alloc(rawobj_t *obj, __u32 **buf, __u32 *buflen)
 198 {
 199         return __rawobj_extract(obj, buf, buflen, 1, 1);
 200 }
 201
 202 int rawobj_from_netobj(rawobj_t *rawobj, netobj_t *netobj)
 203 {
 204         rawobj->len = netobj->len;
 205         rawobj->data = netobj->data;
 206         return 0;
 207 }
 208
 209 int rawobj_from_netobj_alloc(rawobj_t *rawobj, netobj_t *netobj)
 210 {
 211         rawobj->len = 0;
 212         rawobj->data = NULL;
 213
 214         if (netobj->len == 0)
 215                 return 0;
 216
 217         OBD_ALLOC_LARGE(rawobj->data, netobj->len);
 218         if (rawobj->data == NULL)
 219                 return -ENOMEM;
 220
 221         rawobj->len = netobj->len;
 222         memcpy(rawobj->data, netobj->data, netobj->len);
 223         return 0;
 224 }
 225
 226 /****************************************
 227  * misc more                        *
 228  ****************************************/
 229
 230 int buffer_extract_bytes(const void **buf, __u32 *buflen,
 231                          void *res, __u32 reslen)
 232 {
 233         if (*buflen < reslen) {
 234                 CERROR("buflen %u < %u\n", *buflen, reslen);
 235                 return -EINVAL;
 236         }
 237
 238         memcpy(res, *buf, reslen);
 239         *buf += reslen;
 240         *buflen -= reslen;
 241         return 0;
 242 }