1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <sys/zfs_context.h>
28 #include <sys/vfs.h>
29 #include <sys/fs/zfs.h>
30 #include <sys/zfs_znode.h>
31 #include <sys/zfs_sa.h>
32 #include <sys/zfs_acl.h>
33
34 #ifndef _KERNEL
35 static
36 #endif
37 void
zfs_oldace_byteswap(ace_t * ace,int ace_cnt)38 zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
39 {
40 for (int i = 0; i != ace_cnt; i++, ace++) {
41 ace->a_who = BSWAP_32(ace->a_who);
42 ace->a_access_mask = BSWAP_32(ace->a_access_mask);
43 ace->a_flags = BSWAP_16(ace->a_flags);
44 ace->a_type = BSWAP_16(ace->a_type);
45 }
46 }
47
48 /*
49 * swap ace_t and ace_object_t
50 */
51 #ifndef _KERNEL
52 static
53 #endif
54 void
zfs_ace_byteswap(void * buf,size_t size,boolean_t zfs_layout)55 zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
56 {
57 caddr_t end;
58 caddr_t ptr;
59 zfs_ace_t *zacep = NULL;
60 ace_t *acep;
61 uint16_t entry_type;
62 size_t entry_size;
63 int ace_type;
64
65 end = (caddr_t)buf + size;
66 ptr = buf;
67
68 while (ptr < end) {
69 if (zfs_layout) {
70 /*
71 * Avoid overrun. Embedded aces can have one
72 * of several sizes. We don't know exactly
73 * how many our present, only the size of the
74 * buffer containing them. That size may be
75 * larger than needed to hold the aces
76 * present. As long as we do not do any
77 * swapping beyond the end of our block we are
78 * okay. It is safe to swap any non-ace data
79 * within the block since it is just zeros.
80 */
81 if (ptr + sizeof (zfs_ace_hdr_t) > end) {
82 break;
83 }
84 zacep = (zfs_ace_t *)ptr;
85 zacep->z_hdr.z_access_mask =
86 BSWAP_32(zacep->z_hdr.z_access_mask);
87 zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
88 ace_type = zacep->z_hdr.z_type =
89 BSWAP_16(zacep->z_hdr.z_type);
90 entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
91 } else {
92 /* Overrun avoidance */
93 if (ptr + sizeof (ace_t) > end) {
94 break;
95 }
96 acep = (ace_t *)ptr;
97 acep->a_access_mask = BSWAP_32(acep->a_access_mask);
98 acep->a_flags = BSWAP_16(acep->a_flags);
99 ace_type = acep->a_type = BSWAP_16(acep->a_type);
100 acep->a_who = BSWAP_32(acep->a_who);
101 entry_type = acep->a_flags & ACE_TYPE_FLAGS;
102 }
103 switch (entry_type) {
104 case ACE_OWNER:
105 case ACE_EVERYONE:
106 case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
107 entry_size = zfs_layout ?
108 sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
109 break;
110 case ACE_IDENTIFIER_GROUP:
111 default:
112 /* Overrun avoidance */
113 if (zfs_layout) {
114 if (ptr + sizeof (zfs_ace_t) <= end) {
115 zacep->z_fuid = BSWAP_64(zacep->z_fuid);
116 } else {
117 entry_size = sizeof (zfs_ace_t);
118 break;
119 }
120 }
121 switch (ace_type) {
122 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
123 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
124 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
125 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
126 entry_size = zfs_layout ?
127 sizeof (zfs_object_ace_t) :
128 sizeof (ace_object_t);
129 break;
130 default:
131 entry_size = zfs_layout ? sizeof (zfs_ace_t) :
132 sizeof (ace_t);
133 break;
134 }
135 }
136 ptr = ptr + entry_size;
137 }
138 }
139
140 void
zfs_oldacl_byteswap(void * buf,size_t size)141 zfs_oldacl_byteswap(void *buf, size_t size)
142 {
143 /*
144 * Arggh, since we don't know how many ACEs are in
145 * the array, we have to swap the entire block
146 */
147 zfs_oldace_byteswap((ace_t *)buf, size / sizeof (ace_t));
148 }
149
150 void
zfs_acl_byteswap(void * buf,size_t size)151 zfs_acl_byteswap(void *buf, size_t size)
152 {
153 zfs_ace_byteswap(buf, size, B_TRUE);
154 }
155
156 void
zfs_znode_byteswap(void * buf,size_t size)157 zfs_znode_byteswap(void *buf, size_t size)
158 {
159 znode_phys_t *zp = buf;
160
161 ASSERT(size >= sizeof (znode_phys_t));
162
163 zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
164 zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
165 zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
166 zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
167 zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
168 zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
169 zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
170 zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
171 zp->zp_gen = BSWAP_64(zp->zp_gen);
172 zp->zp_mode = BSWAP_64(zp->zp_mode);
173 zp->zp_size = BSWAP_64(zp->zp_size);
174 zp->zp_parent = BSWAP_64(zp->zp_parent);
175 zp->zp_links = BSWAP_64(zp->zp_links);
176 zp->zp_xattr = BSWAP_64(zp->zp_xattr);
177 zp->zp_rdev = BSWAP_64(zp->zp_rdev);
178 zp->zp_flags = BSWAP_64(zp->zp_flags);
179 zp->zp_uid = BSWAP_64(zp->zp_uid);
180 zp->zp_gid = BSWAP_64(zp->zp_gid);
181 zp->zp_zap = BSWAP_64(zp->zp_zap);
182 zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
183 zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
184 zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);
185
186 zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
187 zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
188 zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
189 zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
190 if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
191 zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
192 ZFS_ACE_SPACE);
193 } else {
194 zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
195 ACE_SLOT_CNT);
196 }
197 }
198
199 #if defined(_KERNEL)
200 EXPORT_SYMBOL(zfs_oldacl_byteswap);
201 EXPORT_SYMBOL(zfs_acl_byteswap);
202 EXPORT_SYMBOL(zfs_znode_byteswap);
203 #endif
204