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Pavel Shilovsky093b2bd2011-06-08 15:51:07 +04001/*
2 * fs/cifs/smb2misc.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Pavel Shilovsky (pshilovsky@samba.org) 2012
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23#include <linux/ctype.h>
24#include "smb2pdu.h"
25#include "cifsglob.h"
26#include "cifsproto.h"
27#include "smb2proto.h"
28#include "cifs_debug.h"
29#include "cifs_unicode.h"
30#include "smb2status.h"
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070031#include "smb2glob.h"
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040032
33static int
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070034check_smb2_hdr(struct smb2_sync_hdr *shdr, __u64 mid)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040035{
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070036 __u64 wire_mid = le64_to_cpu(shdr->MessageId);
Sachin Prabhu9235d092014-12-09 17:37:00 +000037
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040038 /*
39 * Make sure that this really is an SMB, that it is a response,
40 * and that the message ids match.
41 */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070042 if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) &&
Sachin Prabhu9235d092014-12-09 17:37:00 +000043 (mid == wire_mid)) {
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070044 if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040045 return 0;
46 else {
47 /* only one valid case where server sends us request */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070048 if (shdr->Command == SMB2_OPLOCK_BREAK)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040049 return 0;
50 else
Joe Perchesf96637b2013-05-04 22:12:25 -050051 cifs_dbg(VFS, "Received Request not response\n");
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040052 }
53 } else { /* bad signature or mid */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070054 if (shdr->ProtocolId != SMB2_PROTO_NUMBER)
Joe Perchesf96637b2013-05-04 22:12:25 -050055 cifs_dbg(VFS, "Bad protocol string signature header %x\n",
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070056 le32_to_cpu(shdr->ProtocolId));
Sachin Prabhu9235d092014-12-09 17:37:00 +000057 if (mid != wire_mid)
Joe Perchesf96637b2013-05-04 22:12:25 -050058 cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
Sachin Prabhu9235d092014-12-09 17:37:00 +000059 mid, wire_mid);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040060 }
Sachin Prabhu9235d092014-12-09 17:37:00 +000061 cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040062 return 1;
63}
64
65/*
66 * The following table defines the expected "StructureSize" of SMB2 responses
67 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses.
68 *
69 * Note that commands are defined in smb2pdu.h in le16 but the array below is
70 * indexed by command in host byte order
71 */
72static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
Fabian Frederickbc09d142014-12-10 15:41:15 -080073 /* SMB2_NEGOTIATE */ cpu_to_le16(65),
74 /* SMB2_SESSION_SETUP */ cpu_to_le16(9),
75 /* SMB2_LOGOFF */ cpu_to_le16(4),
76 /* SMB2_TREE_CONNECT */ cpu_to_le16(16),
77 /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
78 /* SMB2_CREATE */ cpu_to_le16(89),
79 /* SMB2_CLOSE */ cpu_to_le16(60),
80 /* SMB2_FLUSH */ cpu_to_le16(4),
81 /* SMB2_READ */ cpu_to_le16(17),
82 /* SMB2_WRITE */ cpu_to_le16(17),
83 /* SMB2_LOCK */ cpu_to_le16(4),
84 /* SMB2_IOCTL */ cpu_to_le16(49),
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040085 /* BB CHECK this ... not listed in documentation */
Fabian Frederickbc09d142014-12-10 15:41:15 -080086 /* SMB2_CANCEL */ cpu_to_le16(0),
87 /* SMB2_ECHO */ cpu_to_le16(4),
88 /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9),
89 /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9),
90 /* SMB2_QUERY_INFO */ cpu_to_le16(9),
91 /* SMB2_SET_INFO */ cpu_to_le16(2),
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040092 /* BB FIXME can also be 44 for lease break */
Fabian Frederickbc09d142014-12-10 15:41:15 -080093 /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040094};
95
Steve French136ff1b2018-04-08 16:14:31 -050096#ifdef CONFIG_CIFS_SMB311
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +100097static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len,
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +100098 __u32 non_ctxlen)
Steve French136ff1b2018-04-08 16:14:31 -050099{
100 __u16 neg_count;
101 __u32 nc_offset, size_of_pad_before_neg_ctxts;
102 struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
103
104 /* Negotiate contexts are only valid for latest dialect SMB3.11 */
105 neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
106 if ((neg_count == 0) ||
107 (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
108 return 0;
109
110 /* Make sure that negotiate contexts start after gss security blob */
111 nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000112 if (nc_offset < non_ctxlen) {
Steve French136ff1b2018-04-08 16:14:31 -0500113 printk_once(KERN_WARNING "invalid negotiate context offset\n");
114 return 0;
115 }
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000116 size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen;
Steve French136ff1b2018-04-08 16:14:31 -0500117
118 /* Verify that at least minimal negotiate contexts fit within frame */
119 if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
120 printk_once(KERN_WARNING "negotiate context goes beyond end\n");
121 return 0;
122 }
123
124 cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
125 len - nc_offset, size_of_pad_before_neg_ctxts);
126
127 /* length of negcontexts including pad from end of sec blob to them */
128 return (len - nc_offset) + size_of_pad_before_neg_ctxts;
129}
130#endif /* CIFS_SMB311 */
131
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400132int
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000133smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400134{
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000135 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000136 struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr;
Steve French373512e2015-12-18 13:05:30 -0600137 __u64 mid;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400138 __u32 clc_len; /* calculated length */
139 int command;
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000140 int pdu_size = sizeof(struct smb2_sync_pdu);
141 int hdr_size = sizeof(struct smb2_sync_hdr);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400142
143 /*
144 * Add function to do table lookup of StructureSize by command
145 * ie Validate the wct via smb2_struct_sizes table above
146 */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700147 if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
Steve French373512e2015-12-18 13:05:30 -0600148 struct smb2_transform_hdr *thdr =
149 (struct smb2_transform_hdr *)buf;
150 struct cifs_ses *ses = NULL;
151 struct list_head *tmp;
152
153 /* decrypt frame now that it is completely read in */
154 spin_lock(&cifs_tcp_ses_lock);
155 list_for_each(tmp, &srvr->smb_ses_list) {
156 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
157 if (ses->Suid == thdr->SessionId)
158 break;
159
160 ses = NULL;
161 }
162 spin_unlock(&cifs_tcp_ses_lock);
163 if (ses == NULL) {
164 cifs_dbg(VFS, "no decryption - session id not found\n");
165 return 1;
166 }
167 }
168
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700169 mid = le64_to_cpu(shdr->MessageId);
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000170 if (len < pdu_size) {
171 if ((len >= hdr_size)
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700172 && (shdr->Status != 0)) {
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400173 pdu->StructureSize2 = 0;
174 /*
175 * As with SMB/CIFS, on some error cases servers may
176 * not return wct properly
177 */
178 return 0;
179 } else {
Joe Perchesf96637b2013-05-04 22:12:25 -0500180 cifs_dbg(VFS, "Length less than SMB header size\n");
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400181 }
182 return 1;
183 }
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000184 if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500185 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
186 mid);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400187 return 1;
188 }
189
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700190 if (check_smb2_hdr(shdr, mid))
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400191 return 1;
192
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700193 if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500194 cifs_dbg(VFS, "Illegal structure size %u\n",
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700195 le16_to_cpu(shdr->StructureSize));
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400196 return 1;
197 }
198
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700199 command = le16_to_cpu(shdr->Command);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400200 if (command >= NUMBER_OF_SMB2_COMMANDS) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500201 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400202 return 1;
203 }
204
205 if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700206 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700207 pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400208 /* error packets have 9 byte structure size */
Joe Perchesf96637b2013-05-04 22:12:25 -0500209 cifs_dbg(VFS, "Illegal response size %u for command %d\n",
210 le16_to_cpu(pdu->StructureSize2), command);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400211 return 1;
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700212 } else if (command == SMB2_OPLOCK_BREAK_HE
213 && (shdr->Status == 0)
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700214 && (le16_to_cpu(pdu->StructureSize2) != 44)
215 && (le16_to_cpu(pdu->StructureSize2) != 36)) {
216 /* special case for SMB2.1 lease break message */
Joe Perchesf96637b2013-05-04 22:12:25 -0500217 cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
218 le16_to_cpu(pdu->StructureSize2));
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700219 return 1;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400220 }
221 }
222
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000223 clc_len = smb2_calc_size(buf, srvr);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400224
Steve French136ff1b2018-04-08 16:14:31 -0500225#ifdef CONFIG_CIFS_SMB311
226 if (shdr->Command == SMB2_NEGOTIATE)
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000227 clc_len += get_neg_ctxt_len(shdr, len, clc_len);
Steve French136ff1b2018-04-08 16:14:31 -0500228#endif /* SMB311 */
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000229 if (len != clc_len) {
230 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
231 clc_len, len, mid);
Pavel Shilovskyb42bf882013-08-14 19:25:21 +0400232 /* create failed on symlink */
233 if (command == SMB2_CREATE_HE &&
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700234 shdr->Status == STATUS_STOPPED_ON_SYMLINK)
Pavel Shilovskyb42bf882013-08-14 19:25:21 +0400235 return 0;
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700236 /* Windows 7 server returns 24 bytes more */
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000237 if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700238 return 0;
Steve French754789a2014-08-15 23:49:01 -0500239 /* server can return one byte more due to implied bcc[0] */
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000240 if (clc_len == len + 1)
Pavel Shilovsky74112862012-07-27 01:20:41 +0400241 return 0;
Steve French754789a2014-08-15 23:49:01 -0500242
243 /*
244 * MacOS server pads after SMB2.1 write response with 3 bytes
245 * of junk. Other servers match RFC1001 len to actual
246 * SMB2/SMB3 frame length (header + smb2 response specific data)
Ronnie Sahlberg8ce79ec2018-06-01 10:53:08 +1000247 * Some windows servers do too when compounding is used.
Steve French754789a2014-08-15 23:49:01 -0500248 * Log the server error (once), but allow it and continue
249 * since the frame is parseable.
250 */
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000251 if (clc_len < len) {
Steve French754789a2014-08-15 23:49:01 -0500252 printk_once(KERN_WARNING
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000253 "SMB2 server sent bad RFC1001 len %d not %d\n",
Ronnie Sahlberg98170fb2018-05-31 07:43:34 +1000254 len, clc_len);
Steve French754789a2014-08-15 23:49:01 -0500255 return 0;
256 }
257
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400258 return 1;
259 }
260 return 0;
261}
262
263/*
264 * The size of the variable area depends on the offset and length fields
265 * located in different fields for various SMB2 responses. SMB2 responses
266 * with no variable length info, show an offset of zero for the offset field.
267 */
268static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
269 /* SMB2_NEGOTIATE */ true,
270 /* SMB2_SESSION_SETUP */ true,
271 /* SMB2_LOGOFF */ false,
272 /* SMB2_TREE_CONNECT */ false,
273 /* SMB2_TREE_DISCONNECT */ false,
274 /* SMB2_CREATE */ true,
275 /* SMB2_CLOSE */ false,
276 /* SMB2_FLUSH */ false,
277 /* SMB2_READ */ true,
278 /* SMB2_WRITE */ false,
279 /* SMB2_LOCK */ false,
280 /* SMB2_IOCTL */ true,
281 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
282 /* SMB2_ECHO */ false,
283 /* SMB2_QUERY_DIRECTORY */ true,
284 /* SMB2_CHANGE_NOTIFY */ true,
285 /* SMB2_QUERY_INFO */ true,
286 /* SMB2_SET_INFO */ false,
287 /* SMB2_OPLOCK_BREAK */ false
288};
289
290/*
291 * Returns the pointer to the beginning of the data area. Length of the data
292 * area and the offset to it (from the beginning of the smb are also returned.
293 */
Pavel Shilovskyec2e4522011-12-27 16:12:43 +0400294char *
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000295smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400296{
297 *off = 0;
298 *len = 0;
299
300 /* error responses do not have data area */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700301 if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000302 (((struct smb2_err_rsp *)shdr)->StructureSize) ==
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400303 SMB2_ERROR_STRUCTURE_SIZE2)
304 return NULL;
305
306 /*
307 * Following commands have data areas so we have to get the location
308 * of the data buffer offset and data buffer length for the particular
309 * command.
310 */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700311 switch (shdr->Command) {
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400312 case SMB2_NEGOTIATE:
Pavel Shilovskyec2e4522011-12-27 16:12:43 +0400313 *off = le16_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000314 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
Pavel Shilovskyec2e4522011-12-27 16:12:43 +0400315 *len = le16_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000316 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
Pavel Shilovskyec2e4522011-12-27 16:12:43 +0400317 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400318 case SMB2_SESSION_SETUP:
Pavel Shilovsky5478f9b2011-12-27 16:22:00 +0400319 *off = le16_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000320 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
Pavel Shilovsky5478f9b2011-12-27 16:22:00 +0400321 *len = le16_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000322 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
Pavel Shilovsky5478f9b2011-12-27 16:22:00 +0400323 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400324 case SMB2_CREATE:
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400325 *off = le32_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000326 ((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400327 *len = le32_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000328 ((struct smb2_create_rsp *)shdr)->CreateContextsLength);
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400329 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400330 case SMB2_QUERY_INFO:
Pavel Shilovskybe4cb9e2011-12-29 17:06:33 +0400331 *off = le16_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000332 ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
Pavel Shilovskybe4cb9e2011-12-29 17:06:33 +0400333 *len = le32_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000334 ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
Pavel Shilovskybe4cb9e2011-12-29 17:06:33 +0400335 break;
336 case SMB2_READ:
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000337 /* TODO: is this a bug ? */
338 *off = ((struct smb2_read_rsp *)shdr)->DataOffset;
339 *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
Pavel Shilovsky09a47072012-09-18 16:20:29 -0700340 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400341 case SMB2_QUERY_DIRECTORY:
Pavel Shilovskyd324f08d2012-09-18 16:20:33 -0700342 *off = le16_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000343 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
Pavel Shilovskyd324f08d2012-09-18 16:20:33 -0700344 *len = le32_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000345 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
Pavel Shilovskyd324f08d2012-09-18 16:20:33 -0700346 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400347 case SMB2_IOCTL:
Steve French4a72daf2013-06-25 00:20:49 -0500348 *off = le32_to_cpu(
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000349 ((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
350 *len = le32_to_cpu(
351 ((struct smb2_ioctl_rsp *)shdr)->OutputCount);
Steve French4a72daf2013-06-25 00:20:49 -0500352 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400353 case SMB2_CHANGE_NOTIFY:
354 default:
355 /* BB FIXME for unimplemented cases above */
Joe Perchesf96637b2013-05-04 22:12:25 -0500356 cifs_dbg(VFS, "no length check for command\n");
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400357 break;
358 }
359
360 /*
361 * Invalid length or offset probably means data area is invalid, but
362 * we have little choice but to ignore the data area in this case.
363 */
364 if (*off > 4096) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500365 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400366 *len = 0;
367 *off = 0;
368 } else if (*off < 0) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500369 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
370 *off);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400371 *off = 0;
372 *len = 0;
373 } else if (*len < 0) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500374 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
375 *len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400376 *len = 0;
377 } else if (*len > 128 * 1024) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500378 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400379 *len = 0;
380 }
381
382 /* return pointer to beginning of data area, ie offset from SMB start */
383 if ((*off != 0) && (*len != 0))
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700384 return (char *)shdr + *off;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400385 else
386 return NULL;
387}
388
389/*
390 * Calculate the size of the SMB message based on the fixed header
391 * portion, the number of word parameters and the data portion of the message.
392 */
393unsigned int
Ronnie Sahlberg9ec672b2018-04-22 15:30:12 -0600394smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400395{
Ronnie Sahlberg84f0cbf2018-06-01 10:53:04 +1000396 struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf;
397 struct smb2_sync_hdr *shdr = &pdu->sync_hdr;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400398 int offset; /* the offset from the beginning of SMB to data area */
399 int data_length; /* the length of the variable length data area */
400 /* Structure Size has already been checked to make sure it is 64 */
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000401 int len = le16_to_cpu(shdr->StructureSize);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400402
403 /*
404 * StructureSize2, ie length of fixed parameter area has already
405 * been checked to make sure it is the correct length.
406 */
407 len += le16_to_cpu(pdu->StructureSize2);
408
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700409 if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400410 goto calc_size_exit;
411
Ronnie Sahlberge4dc31f2018-06-01 10:53:05 +1000412 smb2_get_data_area_len(&offset, &data_length, shdr);
Joe Perchesf96637b2013-05-04 22:12:25 -0500413 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400414
415 if (data_length > 0) {
416 /*
417 * Check to make sure that data area begins after fixed area,
418 * Note that last byte of the fixed area is part of data area
419 * for some commands, typically those with odd StructureSize,
Ronnie Sahlberg84f0cbf2018-06-01 10:53:04 +1000420 * so we must add one to the calculation.
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400421 */
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000422 if (offset + 1 < len) {
423 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
424 offset + 1, len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400425 data_length = 0;
426 } else {
Ronnie Sahlberg1fc6ad2f2018-06-01 10:53:07 +1000427 len = offset + data_length;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400428 }
429 }
430calc_size_exit:
Joe Perchesf96637b2013-05-04 22:12:25 -0500431 cifs_dbg(FYI, "SMB2 len %d\n", len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400432 return len;
433}
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400434
435/* Note: caller must free return buffer */
436__le16 *
437cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
438{
439 int len;
440 const char *start_of_path;
441 __le16 *to;
Steve Frencha4153cb2014-09-25 14:01:34 -0500442 int map_type;
443
444 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
445 map_type = SFM_MAP_UNI_RSVD;
446 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
447 map_type = SFU_MAP_UNI_RSVD;
448 else
449 map_type = NO_MAP_UNI_RSVD;
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400450
451 /* Windows doesn't allow paths beginning with \ */
452 if (from[0] == '\\')
453 start_of_path = from + 1;
Steve Frenchce558b02018-05-31 19:16:54 -0500454#ifdef CONFIG_CIFS_SMB311
455 /* SMB311 POSIX extensions paths do not include leading slash */
456 else if (cifs_sb_master_tcon(cifs_sb)->posix_extensions)
457 start_of_path = from + 1;
458#endif /* 311 */
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400459 else
460 start_of_path = from;
Steve Frenchce558b02018-05-31 19:16:54 -0500461
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400462 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
Steve Frencha4153cb2014-09-25 14:01:34 -0500463 cifs_sb->local_nls, map_type);
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400464 return to;
465}
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700466
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700467__le32
468smb2_get_lease_state(struct cifsInodeInfo *cinode)
469{
Pavel Shilovsky53ef1012013-09-05 16:11:28 +0400470 __le32 lease = 0;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700471
Pavel Shilovsky53ef1012013-09-05 16:11:28 +0400472 if (CIFS_CACHE_WRITE(cinode))
473 lease |= SMB2_LEASE_WRITE_CACHING;
474 if (CIFS_CACHE_HANDLE(cinode))
475 lease |= SMB2_LEASE_HANDLE_CACHING;
476 if (CIFS_CACHE_READ(cinode))
477 lease |= SMB2_LEASE_READ_CACHING;
478 return lease;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700479}
480
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700481struct smb2_lease_break_work {
482 struct work_struct lease_break;
483 struct tcon_link *tlink;
484 __u8 lease_key[16];
485 __le32 lease_state;
486};
487
488static void
489cifs_ses_oplock_break(struct work_struct *work)
490{
491 struct smb2_lease_break_work *lw = container_of(work,
492 struct smb2_lease_break_work, lease_break);
493 int rc;
494
495 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
496 lw->lease_state);
Joe Perchesf96637b2013-05-04 22:12:25 -0500497 cifs_dbg(FYI, "Lease release rc %d\n", rc);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700498 cifs_put_tlink(lw->tlink);
499 kfree(lw);
500}
501
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700502static bool
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400503smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
504 struct smb2_lease_break_work *lw)
505{
506 bool found;
507 __u8 lease_state;
508 struct list_head *tmp;
509 struct cifsFileInfo *cfile;
Pavel Shilovsky42873b02013-09-05 21:30:16 +0400510 struct TCP_Server_Info *server = tcon->ses->server;
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400511 struct cifs_pending_open *open;
512 struct cifsInodeInfo *cinode;
513 int ack_req = le32_to_cpu(rsp->Flags &
514 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
515
Pavel Shilovsky53ef1012013-09-05 16:11:28 +0400516 lease_state = le32_to_cpu(rsp->NewLeaseState);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400517
518 list_for_each(tmp, &tcon->openFileList) {
519 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
David Howells2b0143b2015-03-17 22:25:59 +0000520 cinode = CIFS_I(d_inode(cfile->dentry));
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400521
522 if (memcmp(cinode->lease_key, rsp->LeaseKey,
523 SMB2_LEASE_KEY_SIZE))
524 continue;
525
526 cifs_dbg(FYI, "found in the open list\n");
Steve French59b04c52014-08-02 21:16:48 -0500527 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400528 le32_to_cpu(rsp->NewLeaseState));
529
Pavel Shilovsky42873b02013-09-05 21:30:16 +0400530 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400531
532 if (ack_req)
533 cfile->oplock_break_cancelled = false;
534 else
535 cfile->oplock_break_cancelled = true;
536
Rabin Vincent3998e6b2017-05-03 17:54:01 +0200537 queue_work(cifsoplockd_wq, &cfile->oplock_break);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400538 kfree(lw);
539 return true;
540 }
541
542 found = false;
543 list_for_each_entry(open, &tcon->pending_opens, olist) {
544 if (memcmp(open->lease_key, rsp->LeaseKey,
545 SMB2_LEASE_KEY_SIZE))
546 continue;
547
548 if (!found && ack_req) {
549 found = true;
550 memcpy(lw->lease_key, open->lease_key,
551 SMB2_LEASE_KEY_SIZE);
552 lw->tlink = cifs_get_tlink(open->tlink);
553 queue_work(cifsiod_wq, &lw->lease_break);
554 }
555
556 cifs_dbg(FYI, "found in the pending open list\n");
Steve French59b04c52014-08-02 21:16:48 -0500557 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400558 le32_to_cpu(rsp->NewLeaseState));
559
560 open->oplock = lease_state;
561 }
562 return found;
563}
564
565static bool
566smb2_is_valid_lease_break(char *buffer)
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700567{
568 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
569 struct list_head *tmp, *tmp1, *tmp2;
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400570 struct TCP_Server_Info *server;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700571 struct cifs_ses *ses;
572 struct cifs_tcon *tcon;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700573 struct smb2_lease_break_work *lw;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700574
575 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
Joe Perchesf96637b2013-05-04 22:12:25 -0500576 if (!lw)
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700577 return false;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700578
579 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
580 lw->lease_state = rsp->NewLeaseState;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700581
Joe Perchesf96637b2013-05-04 22:12:25 -0500582 cifs_dbg(FYI, "Checking for lease break\n");
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700583
584 /* look up tcon based on tid & uid */
585 spin_lock(&cifs_tcp_ses_lock);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400586 list_for_each(tmp, &cifs_tcp_ses_list) {
587 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700588
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400589 list_for_each(tmp1, &server->smb_ses_list) {
590 ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700591
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400592 list_for_each(tmp2, &ses->tcon_list) {
593 tcon = list_entry(tmp2, struct cifs_tcon,
594 tcon_list);
Steve French3afca262016-09-22 18:58:16 -0500595 spin_lock(&tcon->open_file_lock);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400596 cifs_stats_inc(
597 &tcon->stats.cifs_stats.num_oplock_brks);
598 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
Steve French3afca262016-09-22 18:58:16 -0500599 spin_unlock(&tcon->open_file_lock);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400600 spin_unlock(&cifs_tcp_ses_lock);
601 return true;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700602 }
Steve French3afca262016-09-22 18:58:16 -0500603 spin_unlock(&tcon->open_file_lock);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700604 }
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700605 }
606 }
607 spin_unlock(&cifs_tcp_ses_lock);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700608 kfree(lw);
Joe Perchesf96637b2013-05-04 22:12:25 -0500609 cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700610 return false;
611}
612
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700613bool
614smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
615{
Ronnie Sahlberg0d5a2882018-06-01 10:53:03 +1000616 struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700617 struct list_head *tmp, *tmp1, *tmp2;
618 struct cifs_ses *ses;
619 struct cifs_tcon *tcon;
620 struct cifsInodeInfo *cinode;
621 struct cifsFileInfo *cfile;
622
Joe Perchesf96637b2013-05-04 22:12:25 -0500623 cifs_dbg(FYI, "Checking for oplock break\n");
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700624
Ronnie Sahlberg0d5a2882018-06-01 10:53:03 +1000625 if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700626 return false;
627
Steve French12e8a202012-09-19 09:19:39 -0700628 if (rsp->StructureSize !=
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700629 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700630 if (le16_to_cpu(rsp->StructureSize) == 44)
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400631 return smb2_is_valid_lease_break(buffer);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700632 else
633 return false;
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700634 }
635
Steve French59b04c52014-08-02 21:16:48 -0500636 cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700637
638 /* look up tcon based on tid & uid */
639 spin_lock(&cifs_tcp_ses_lock);
640 list_for_each(tmp, &server->smb_ses_list) {
641 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
642 list_for_each(tmp1, &ses->tcon_list) {
643 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
644
645 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
Steve French3afca262016-09-22 18:58:16 -0500646 spin_lock(&tcon->open_file_lock);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700647 list_for_each(tmp2, &tcon->openFileList) {
648 cfile = list_entry(tmp2, struct cifsFileInfo,
649 tlist);
650 if (rsp->PersistentFid !=
651 cfile->fid.persistent_fid ||
652 rsp->VolatileFid !=
653 cfile->fid.volatile_fid)
654 continue;
655
Joe Perchesf96637b2013-05-04 22:12:25 -0500656 cifs_dbg(FYI, "file id match, oplock break\n");
David Howells2b0143b2015-03-17 22:25:59 +0000657 cinode = CIFS_I(d_inode(cfile->dentry));
Steve French3afca262016-09-22 18:58:16 -0500658 spin_lock(&cfile->file_info_lock);
Pavel Shilovsky18cceb62013-09-05 13:01:06 +0400659 if (!CIFS_CACHE_WRITE(cinode) &&
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700660 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
661 cfile->oplock_break_cancelled = true;
662 else
663 cfile->oplock_break_cancelled = false;
664
Sachin Prabhuc11f1df2014-03-11 16:11:47 +0000665 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
666 &cinode->flags);
667
668 /*
669 * Set flag if the server downgrades the oplock
670 * to L2 else clear.
671 */
672 if (rsp->OplockLevel)
673 set_bit(
674 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
675 &cinode->flags);
676 else
677 clear_bit(
678 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
679 &cinode->flags);
Steve French3afca262016-09-22 18:58:16 -0500680 spin_unlock(&cfile->file_info_lock);
Rabin Vincent3998e6b2017-05-03 17:54:01 +0200681 queue_work(cifsoplockd_wq,
682 &cfile->oplock_break);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700683
Steve French3afca262016-09-22 18:58:16 -0500684 spin_unlock(&tcon->open_file_lock);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700685 spin_unlock(&cifs_tcp_ses_lock);
686 return true;
687 }
Steve French3afca262016-09-22 18:58:16 -0500688 spin_unlock(&tcon->open_file_lock);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700689 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesf96637b2013-05-04 22:12:25 -0500690 cifs_dbg(FYI, "No matching file for oplock break\n");
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700691 return true;
692 }
693 }
694 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesf96637b2013-05-04 22:12:25 -0500695 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700696 return false;
697}
Sachin Prabhu38bd4902017-03-03 15:41:38 -0800698
699void
700smb2_cancelled_close_fid(struct work_struct *work)
701{
702 struct close_cancelled_open *cancelled = container_of(work,
703 struct close_cancelled_open, work);
704
705 cifs_dbg(VFS, "Close unmatched open\n");
706
707 SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
708 cancelled->fid.volatile_fid);
709 cifs_put_tcon(cancelled->tcon);
710 kfree(cancelled);
711}
712
713int
714smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
715{
Ronnie Sahlberg49f466b2018-06-01 10:53:06 +1000716 struct smb2_sync_hdr *sync_hdr = (struct smb2_sync_hdr *)buffer;
Sachin Prabhu38bd4902017-03-03 15:41:38 -0800717 struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
718 struct cifs_tcon *tcon;
719 struct close_cancelled_open *cancelled;
720
721 if (sync_hdr->Command != SMB2_CREATE ||
722 sync_hdr->Status != STATUS_SUCCESS)
723 return 0;
724
725 cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
726 if (!cancelled)
727 return -ENOMEM;
728
729 tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
730 sync_hdr->TreeId);
731 if (!tcon) {
732 kfree(cancelled);
733 return -ENOENT;
734 }
735
736 cancelled->fid.persistent_fid = rsp->PersistentFileId;
737 cancelled->fid.volatile_fid = rsp->VolatileFileId;
738 cancelled->tcon = tcon;
739 INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
740 queue_work(cifsiod_wq, &cancelled->work);
741
742 return 0;
743}
Aurelien Aptel8bd68c62018-02-16 19:19:29 +0100744
745#ifdef CONFIG_CIFS_SMB311
746/**
747 * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
748 *
749 * Assumes @iov does not contain the rfc1002 length and iov[0] has the
750 * SMB2 header.
751 */
752int
753smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
754{
755 int i, rc;
756 struct sdesc *d;
757 struct smb2_sync_hdr *hdr;
758
759 if (ses->server->tcpStatus == CifsGood) {
760 /* skip non smb311 connections */
761 if (ses->server->dialect != SMB311_PROT_ID)
762 return 0;
763
764 /* skip last sess setup response */
765 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
766 if (hdr->Flags & SMB2_FLAGS_SIGNED)
767 return 0;
768 }
769
770 rc = smb311_crypto_shash_allocate(ses->server);
771 if (rc)
772 return rc;
773
774 d = ses->server->secmech.sdescsha512;
775 rc = crypto_shash_init(&d->shash);
776 if (rc) {
777 cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__);
778 return rc;
779 }
780
781 rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
782 SMB2_PREAUTH_HASH_SIZE);
783 if (rc) {
784 cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__);
785 return rc;
786 }
787
788 for (i = 0; i < nvec; i++) {
789 rc = crypto_shash_update(&d->shash,
790 iov[i].iov_base, iov[i].iov_len);
791 if (rc) {
792 cifs_dbg(VFS, "%s: could not update sha512 shash\n",
793 __func__);
794 return rc;
795 }
796 }
797
798 rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
799 if (rc) {
800 cifs_dbg(VFS, "%s: could not finalize sha512 shash\n",
801 __func__);
802 return rc;
803 }
804
805 return 0;
806}
807#endif